{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,25]],"date-time":"2026-04-25T16:41:07Z","timestamp":1777135267266,"version":"3.51.4"},"reference-count":59,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2023,7,28]],"date-time":"2023-07-28T00:00:00Z","timestamp":1690502400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006769","name":"Russian Science Foundation","doi-asserted-by":"publisher","award":["23-73-00028"],"award-info":[{"award-number":["23-73-00028"]}],"id":[{"id":"10.13039\/501100006769","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>A new para-aramid aerogel based on a polymer made by the reaction of terephthaloyl dichloride with 2-(4-aminophenyl)-1H-benzimidazol-5-amine (PABI) is introduced. The aerogel readily bound Pd (+2) ions and was used as a hydrogenation catalyst in some industrially actual reactions. The new material, which did not contain p-phenylenediamine moieties, was prepared in two form factors: bulk samples and spherical pellets of 700\u2013900 \u03bcm in diameter. Aerogels were synthesized from 1% or 5% solutions of PABI in N,N-dimethylacetamide via gelation with acetone or isopropanol and had a density of 0.057 or 0.375 g\/cm3 depending on the concentration of the starting PABI solution. The specific surface area of the obtained samples was 470 or 320 m2\/g. Spherical pellets containing Pd were prepared from a solution of PdCl2 in PABI and were used as heterogeneous catalysts for the gas-phase hydrogenation of unsaturated organic compounds presenting the main types of industrially important substrates: olefins, acetylenes, aromatics, carbonyls, and nitriles. Catalytic hydrogenation of gaseous hexene-1, hexyne-3, cyclohexene, and acrylonitrile C=C bond proceeded with a 99% conversion at ambient pressure, but the catalyst failed to reduce acetone at 150 \u00b0C and benzene and ethyl acetate even at 200 \u00b0C. The only product of acrylonitrile hydrogenation was propionitrile. The prepared catalysts showed high selectivity, which is important for the chemistry of complex organic compounds.<\/jats:p>","DOI":"10.3390\/polym15153206","type":"journal-article","created":{"date-parts":[[2023,7,28]],"date-time":"2023-07-28T07:35:24Z","timestamp":1690529724000},"page":"3206","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Highly Porous Para-Aramid Aerogel as a Heterogeneous Catalyst for Selective Hydrogenation of Unsaturated Organic Compounds"],"prefix":"10.3390","volume":"15","author":[{"given":"Sergey A.","family":"Lermontov","sequence":"first","affiliation":[{"name":"Institute of Physiologically Active Compounds of Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 Severnij pr., Chernogolovka 142432, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nikita E.","family":"Vlasenko","sequence":"additional","affiliation":[{"name":"Institute of Physiologically Active Compounds of Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 Severnij pr., Chernogolovka 142432, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nataliya A.","family":"Sipyagina","sequence":"additional","affiliation":[{"name":"Institute of Physiologically Active Compounds of Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 Severnij pr., Chernogolovka 142432, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alena N.","family":"Malkova","sequence":"additional","affiliation":[{"name":"Institute of Physiologically Active Compounds of Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 Severnij pr., Chernogolovka 142432, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Inna O.","family":"Gozhikova","sequence":"additional","affiliation":[{"name":"Institute of Physiologically Active Compounds of Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 Severnij pr., Chernogolovka 142432, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2378-7446","authenticated-orcid":false,"given":"Alexander E.","family":"Baranchikov","sequence":"additional","affiliation":[{"name":"Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky prosp., 31, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5920-1139","authenticated-orcid":false,"given":"Evgeniya I.","family":"Knerelman","sequence":"additional","affiliation":[{"name":"Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 Ac. Semenov avenue, Chernogolovka 142432, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"941","DOI":"10.3390\/ma6030941","article-title":"A special material or a new state of matter: A review and reconsideration of the aerogel","volume":"6","author":"Du","year":"2013","journal-title":"Materials"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"7580","DOI":"10.1002\/anie.201709014","article-title":"Biopolymer aerogels and foams: Chemistry, properties, and applications","volume":"57","author":"Zhao","year":"2018","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"338","DOI":"10.1007\/s42765-020-00054-8","article-title":"Self-reinforcement of light, temperature-resistant silica nanofibrous aerogels with tunable mechanical properties","volume":"2","author":"Huang","year":"2020","journal-title":"Adv. Fiber Mater."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1021\/acs.jced.8b00556","article-title":"Facile fabrication of biochar\/Al2O3 adsorbent and its application for fluoride removal from aqueous solution","volume":"64","author":"Jiang","year":"2018","journal-title":"J. Chem. Eng. Data."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"19806","DOI":"10.1021\/acsami.8b03983","article-title":"Freeze-dried carbon nanotube aerogels for high-frequency absorber applications","volume":"10","author":"Anoshkin","year":"2018","journal-title":"ACS Appl. Mater. Interfaces."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"765","DOI":"10.1016\/j.carbon.2017.04.001","article-title":"Preparation of carbon nanotubes\/graphene hybrid aerogel and its application for the adsorption of organic compounds","volume":"118","author":"Wang","year":"2017","journal-title":"Carbon"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"63","DOI":"10.1016\/j.colsurfa.2004.03.007","article-title":"Nanofibrillar cellulose aerogels","volume":"240","author":"Jin","year":"2004","journal-title":"Colloids Surf. A Physicochem. Eng. Aspects"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"5263","DOI":"10.1021\/acs.jced.9b00489","article-title":"Study of adsorption of CO2 and CH4 on resorcinol\u2013formaldehyde aerogels at high pressures","volume":"64","author":"Giraldo","year":"2019","journal-title":"J. Chem. Eng. Data."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1021\/am800101a","article-title":"Supercritical gel drying: A powerful tool for tailoring symmetric porous PVDF\u2212HFP membranes","volume":"1","author":"Cardea","year":"2009","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"969","DOI":"10.1021\/am200107w","article-title":"Aerogels and polymorphism of isotactic poly (4-methyl-pentene-1)","volume":"3","author":"Daniel","year":"2011","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1515","DOI":"10.1002\/adma.200401762","article-title":"Aerogels with a microporous crystalline host phase","volume":"17","author":"Daniel","year":"2005","journal-title":"Adv. Mater."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"577","DOI":"10.1021\/cm702475a","article-title":"Syndiotactic polystyrene aerogels: Adsorption in amorphous pores and absorption in crystalline nanocavities","volume":"20","author":"Daniel","year":"2008","journal-title":"Chem. Mater."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1028","DOI":"10.1021\/cm802537g","article-title":"Syndiotatic Polystyrene Aerogels with \u03b2, \u03b3, and \u03b5 Crystalline Phases","volume":"21","author":"Daniel","year":"2009","journal-title":"Chem. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"122744","DOI":"10.1016\/j.polymer.2020.122744","article-title":"Ultra-high molecular weight polyethylene with hybrid porous structure","volume":"202","author":"Lermontov","year":"2020","journal-title":"Polymer"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"121824","DOI":"10.1016\/j.polymer.2019.121824","article-title":"Properties of highly porous aerogels prepared from ultra-high molecular weight polyethylene","volume":"182","author":"Lermontov","year":"2019","journal-title":"Polymer"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"151993","DOI":"10.1016\/j.apsusc.2021.151993","article-title":"Constructing porous polyimide\/carbon quantum dots aerogel with efficient photocatalytic property under visible light","volume":"578","author":"Bai","year":"2022","journal-title":"Appl. Surf. Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"106283","DOI":"10.1016\/j.compositesa.2021.106283","article-title":"Fabrication and applications of polyimide nano-aerogels","volume":"143","author":"Shi","year":"2021","journal-title":"Compos. Part A Appl. Sci. Manuf."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"129341","DOI":"10.1016\/j.cej.2021.129341","article-title":"Super-flexible polyimide nanofiber cross-linked polyimide aerogel membranes for high efficient flexible thermal protection","volume":"417","author":"Hou","year":"2021","journal-title":"Chem. Eng. J."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"10416","DOI":"10.1021\/acsami.0c21842","article-title":"Facile preparation of continuous and porous polyimide aerogel fibers for multifunctional applications","volume":"13","author":"Li","year":"2021","journal-title":"ACS Appl. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"8178","DOI":"10.1021\/acsnano.7b03119","article-title":"Biomimetic hybridization of kevlar into silk fibroin: Nanofibrous strategy for improved mechanic properties of flexible composites and filtration membranes","volume":"11","author":"Lv","year":"2017","journal-title":"ACS Nano"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2000186","DOI":"10.1002\/adfm.202000186","article-title":"Fabrication, applications, and prospects of aramid nanofiber","volume":"30","author":"Yang","year":"2020","journal-title":"Adv. Funct. Mater."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"6682","DOI":"10.1021\/acsnano.7b00790","article-title":"Mechanically strong graphene\/aramid nanofiber composite electrodes for structural energy and power","volume":"11","author":"Kwon","year":"2017","journal-title":"ACS Nano"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"108021","DOI":"10.1016\/j.compscitech.2020.108021","article-title":"Highly thermally conductive, ductile biomimetic boron nitride\/aramid nanofiber composite film","volume":"189","author":"Xiao","year":"2020","journal-title":"Compos. Sci. Technol."},{"key":"ref_24","first-page":"233","article-title":"Preparation of p-aramid aerogels using supercritical CO2","volume":"70","author":"Shao","year":"2014","journal-title":"J. Fiber Sci. Technol."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"5703","DOI":"10.1021\/acsnano.9b01094","article-title":"Nanofibrous kevlar aerogel threads for thermal insulation in harsh environments","volume":"13","author":"Liu","year":"2019","journal-title":"ACS Nano"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"2236","DOI":"10.1021\/acsnano.8b08913","article-title":"Nanofibrous kevlar aerogel films and their phase-change composites for highly efficient infrared stealth","volume":"13","author":"Lyu","year":"2019","journal-title":"ACS Nano"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"7548","DOI":"10.1039\/D0TA01654C","article-title":"The potential of Kevlar aramid nanofiber composite membranes","volume":"8","author":"Zhao","year":"2020","journal-title":"J. Mater. Chem. A"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"3013","DOI":"10.1002\/pc.24302","article-title":"All-aramid composites by partial fiber dissolution in mixed solvents","volume":"39","author":"Zhang","year":"2018","journal-title":"Polym. Compos."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1801","DOI":"10.1021\/acsami.6b13100","article-title":"Highly porous, rigid-rod polyamide aerogels with superior mechanical properties and unusually high thermal conductivity","volume":"9","author":"Williams","year":"2017","journal-title":"ACS Appl. Mater."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"e53301","DOI":"10.1002\/app.53301","article-title":"High-performance heterocyclic para-aramid aerogels for selective dye adsorption and thermal insulation applications","volume":"140","author":"Wu","year":"2023","journal-title":"J. Appl. Polym. Sci."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"367","DOI":"10.1016\/j.eurpolymj.2019.08.011","article-title":"Construction of dendritic structure by nano-SiO2 derivate grafted with hyperbranched polyamide in aramid fiber to simultaneously improve its mechanical and compressive properties","volume":"119","author":"Dai","year":"2019","journal-title":"Eur. Polym. J."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"14334","DOI":"10.1021\/acsnano.2c04572","article-title":"The aramid-coating-on-aramid strategy toward strong, tough, and foldable polymer aerogel films","volume":"16","author":"Yang","year":"2022","journal-title":"ACS Nano"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"16886","DOI":"10.1080\/19443994.2015.1082506","article-title":"Absorption of heavy metals using resorcinol formaldehyde aerogel modified with amine groups","volume":"57","author":"Motahari","year":"2016","journal-title":"Desalination Water Treat."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"89","DOI":"10.1134\/S1070328422020014","article-title":"Functionalization of aerogels with coordination compounds","volume":"48","author":"Yorov","year":"2022","journal-title":"Russ. J. Coord. Chem."},{"key":"ref_35","first-page":"87","article-title":"Mesoporous metal complex\u2013silica aerogels for environmentally friendly amination of allylic alcohols","volume":"7","author":"Grau","year":"2015","journal-title":"Chem. Cat. Chem"},{"key":"ref_36","first-page":"398","article-title":"Evidence for the formation of cobalt porphyrin-quinone complexes stabilized at carbon-based surfaces toward the design of efficient non-noble-metal oxygen reduction catalysts","volume":"1","author":"Elbaz","year":"2010","journal-title":"J. Phys. Chem."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1093","DOI":"10.1039\/B604544H","article-title":"Highly dispersed nickel and palladium nanoparticle silica aerogels: Sol\u2013gel processing of tethered metal complexes and application as catalysts in the Mizoroki\u2013Heck reaction","volume":"30","author":"Vallribera","year":"2006","journal-title":"New J. Chem."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"366","DOI":"10.1006\/jcat.1997.1772","article-title":"Pd\/SiO2-cogelled aerogel catalysts and impregnated aerogel and xerogel catalysts: Synthesis and characterization","volume":"170","author":"Heinrichs","year":"1997","journal-title":"J. Catal."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1296","DOI":"10.1021\/cm001187w","article-title":"Nondestructive sol-gel immobilization of metal (salen) catalysts in silica aerogels and xerogels","volume":"13","author":"Murphy","year":"2001","journal-title":"Chem. Mater."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1007\/s002890050572","article-title":"Sol-gel synthesis of Ru (II) complex of 3-4, 5-dihydroimidazol-1-yl-propyltriethoxysilane aerogels and xerogels","volume":"44","year":"2000","journal-title":"Polym. Bull."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"225","DOI":"10.1039\/C0NJ00509F","article-title":"Synthesis of mesoporous metal complex-silica materials and their use as solvent-free catalysts","volume":"35","author":"Linares","year":"2011","journal-title":"New J. Chem."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"449","DOI":"10.1007\/s10934-022-01357-4","article-title":"Novel aminophosphonate ligand for the preparation of catalytically active silica aerogels with finely dispersed palladium","volume":"30","author":"Sipyagina","year":"2023","journal-title":"J. Porous Mater."},{"key":"ref_43","unstructured":"Uozumi, Y. (2004). Immobilized Catalysts: Solid Phases, Immobilization and Applications, Springer."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1016\/S1381-1169(97)00212-4","article-title":"Catalytic hydrogenation of alkadienes and alkynes by palladium catalysts supported on heterocyclic polyamides","volume":"129","author":"Michalska","year":"1998","journal-title":"J. Mol. Catal. A Chem."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"190","DOI":"10.1016\/0021-9517(86)90153-3","article-title":"Hydrogenation of \u03b1,\u03b2-unsaturated aldehydes over Pt Sn\/Nylon","volume":"102","author":"Poltarzewski","year":"1986","journal-title":"J. Catal."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"3301","DOI":"10.1021\/cr0103423","article-title":"ROMPgel reagents in parallel synthesis","volume":"102","author":"Barrett","year":"2002","journal-title":"Chem. Rev."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"4294","DOI":"10.1021\/ma034245i","article-title":"Palladium nanoparticles supported on hyperbranched aramids: Synthesis, characterization, and some applications in the hydrogenation of unsaturated substrates","volume":"36","author":"Tabuani","year":"2003","journal-title":"Macromolecules"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"276","DOI":"10.1515\/epoly.2007.7.1.276","article-title":"On the use of hyperbranched aramids as support of Pt nanoparticles","volume":"7","author":"Monticelli","year":"2007","journal-title":"e-Polymers"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"1571","DOI":"10.1039\/c39850001571","article-title":"Selective synthesis of alkynes by catalytic dehydrogenation of alkenes over polymer-supported palladium acetate in the liquid phase","volume":"22","author":"Cum","year":"1985","journal-title":"J. Chem. Soc. Chem. Commun."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1016\/0304-5102(90)85086-W","article-title":"Polymer-supported catalysts: Preparation and characterisation of complexes between palladium derivatives and oligomeric aramides","volume":"59","author":"Capannelli","year":"1990","journal-title":"J. Mol. Catal."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1002\/pat.1820","article-title":"Adsorption properties for metal ions of waste poly (p-phenylene terephthalamide) fiber after chemical modification","volume":"23","author":"Qu","year":"2012","journal-title":"Polym. Adv. Technol."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"323","DOI":"10.1016\/j.apsusc.2017.01.051","article-title":"Nondestructive grafting of PEI on aramid fiber surface through the coordination of Fe (III) to enhance composite interfacial properties","volume":"401","author":"Cheng","year":"2017","journal-title":"Appl. Surf. Sci."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"595","DOI":"10.1039\/D0MA00286K","article-title":"Synthesis of heterocyclic aramid nanofibers and high performance nanopaper","volume":"1","author":"Shi","year":"2020","journal-title":"Mater. Adv."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"309","DOI":"10.1021\/ja01269a023","article-title":"Adsorption of gases in multimolecular layers","volume":"60","author":"Brunauer","year":"1938","journal-title":"J. Am. Chem. Soc."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"319","DOI":"10.1016\/0021-9517(65)90307-6","article-title":"Studies on pore systems in catalysts: V. The t method","volume":"4","author":"Lippens","year":"1965","journal-title":"J. Catal."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"373","DOI":"10.1021\/ja01145a126","article-title":"The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations from Nitrogen Isotherms","volume":"73","author":"Barrett","year":"1951","journal-title":"J. Am. Chem. Soc."},{"key":"ref_57","unstructured":"Lowell, S., Shields, J.E., Thomas, M.A., and Thommes, M. (2006). Characterization of Porous Solids and Powders: Surface Area, Pore Size, and Density, Springer."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"3824","DOI":"10.1021\/ma052228i","article-title":"Synthesis and characterization of rod-coil poly(amide-block-aramid) alternating block copolymers","volume":"39","author":"Jager","year":"2006","journal-title":"Macromolecules"},{"key":"ref_59","unstructured":"Baker, A.D., and Engel, R. (1992). Organic Chemistry, West Publishing Company."}],"container-title":["Polymers"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-4360\/15\/15\/3206\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T20:21:14Z","timestamp":1760127674000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-4360\/15\/15\/3206"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,7,28]]},"references-count":59,"journal-issue":{"issue":"15","published-online":{"date-parts":[[2023,8]]}},"alternative-id":["polym15153206"],"URL":"https:\/\/doi.org\/10.3390\/polym15153206","relation":{},"ISSN":["2073-4360"],"issn-type":[{"value":"2073-4360","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,7,28]]}}}