{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T21:06:39Z","timestamp":1790888799268,"version":"4.1.0"},"reference-count":33,"publisher":"American Chemical Society (ACS)","issue":"18","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Am. Chem. Soc."],"published-print":{"date-parts":[[2003,5,1]]},"DOI":"10.1021\/ja034085q","type":"journal-article","created":{"date-parts":[[2003,4,30]],"date-time":"2003-04-30T04:56:21Z","timestamp":1051678581000},"page":"5479-5485","source":"Crossref","is-referenced-by-count":256,"title":["Exfoliated Nanosheets as a New Strong Solid Acid Catalyst"],"prefix":"10.1021","volume":"125","author":[{"given":"Atsushi","family":"Takagaki","sequence":"first","affiliation":[{"name":"Contribution from the Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Company, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan, and Institute for Materials & Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mariko","family":"Sugisawa","sequence":"additional","affiliation":[{"name":"Contribution from the Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Company, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan, and Institute for Materials & Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Darling","family":"Lu","sequence":"additional","affiliation":[{"name":"Contribution from the Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Company, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan, and Institute for Materials & Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junko N.","family":"Kondo","sequence":"additional","affiliation":[{"name":"Contribution from the Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Company, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan, and Institute for Materials & Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michikazu","family":"Hara","sequence":"additional","affiliation":[{"name":"Contribution from the Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Company, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan, and Institute for Materials & Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazunari","family":"Domen","sequence":"additional","affiliation":[{"name":"Contribution from the Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Company, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan, and Institute for Materials & Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shigenobu","family":"Hayashi","sequence":"additional","affiliation":[{"name":"Contribution from the Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Company, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan, and Institute for Materials & Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2003,4,4]]},"reference":[{"key":"ja034085qb00001\/ja034085qb00001_1","doi-asserted-by":"crossref","first-page":"1455","DOI":"10.1021\/cm010689m","volume":"14","author":"Schaak R. E.","year":"2002","journal-title":"Chem. Mater."},{"key":"ja034085qb00002\/ja034085qb00002_1","doi-asserted-by":"crossref","first-page":"356","DOI":"10.1039\/c39860000356","author":"Domen K.","year":"1986","journal-title":"J. Chem. Soc., Chem. Commun."},{"key":"ja034085qb00002\/ja034085qb00002_2","doi-asserted-by":"crossref","first-page":"337","DOI":"10.1016\/0021-9517(89)90274-1","volume":"120","author":"Kudo A.","year":"1989","journal-title":"J. Catal."},{"key":"ja034085qb00003\/ja034085qb00003_1","doi-asserted-by":"crossref","first-page":"1063","DOI":"10.1021\/cm960612b","volume":"9","author":"Takata T.","year":"1997","journal-title":"Chem. Mater."},{"key":"ja034085qb00004\/ja034085qb00004_1","doi-asserted-by":"crossref","unstructured":"Bhat, V.; Domen, K. InElectron Transfer in Chemistry; Balzani, V., Ed.; Wiley\u2212VCH:\u2009 Weinheim, 2001; Vol. 4, pp 487\u2212540.","DOI":"10.1002\/9783527618248.ch56"},{"key":"ja034085qb00005\/ja034085qb00005_1","doi-asserted-by":"crossref","first-page":"9561","DOI":"10.1021\/ja00025a021","volume":"113","author":"Kim Y. I.","year":"1991","journal-title":"J. Am. Chem. Soc."},{"key":"ja034085qb00006\/ja034085qb00006_1","doi-asserted-by":"crossref","first-page":"2491","DOI":"10.1021\/jp962539i","volume":"101","author":"Kim Y. I.","year":"1997","journal-title":"J. Phys. Chem. B"},{"key":"ja034085qb00007\/ja034085qb00007_1","first-page":"99","volume-title":"Intercalation Chemistry","author":"Thomas J.","year":"1982"},{"key":"ja034085qb00008\/ja034085qb00008_1","doi-asserted-by":"crossref","first-page":"8329","DOI":"10.1021\/ja960073b","volume":"118","author":"Sasaki T.","year":"1996","journal-title":"J. Am. Chem. Soc."},{"key":"ja034085qb00009\/ja034085qb00009_1","doi-asserted-by":"crossref","first-page":"2179","DOI":"10.1021\/cm970284v","volume":"9","author":"Abe R.","year":"1997","journal-title":"Chem. Mater."},{"key":"ja034085qb00010\/ja034085qb00010_1","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1021\/cm970481u","volume":"10","author":"Abe R.","year":"1998","journal-title":"Chem. Mater."},{"key":"ja034085qb00011\/ja034085qb00011_1","doi-asserted-by":"crossref","first-page":"3435","DOI":"10.1021\/ja982985e","volume":"121","author":"Kaschak M.","year":"1999","journal-title":"J. Am. Chem. Soc."},{"key":"ja034085qb00012\/ja034085qb00012_1","doi-asserted-by":"crossref","first-page":"1556","DOI":"10.1021\/cm981136n","volume":"12","author":"Saupe G. B.","year":"2000","journal-title":"Chem. Mater."},{"key":"ja034085qb00013\/ja034085qb00013_1","doi-asserted-by":"crossref","first-page":"3427","DOI":"10.1021\/cm000495r","volume":"12","author":"Schaak R. E.","year":"2000","journal-title":"Chem. Mater."},{"key":"ja034085qb00014\/ja034085qb00014_1","doi-asserted-by":"crossref","first-page":"706","DOI":"10.1039\/b110220f","author":"Schaak R. E.","year":"2002","journal-title":"J. Chem. Soc., Chem. Commun."},{"key":"ja034085qb00015\/ja034085qb00015_1","doi-asserted-by":"crossref","first-page":"1277","DOI":"10.1039\/b006045n","volume":"11","author":"Han Y.-S.","year":"2001","journal-title":"J. Mater. Chem."},{"key":"ja034085qb00016\/ja034085qb00016_1","doi-asserted-by":"crossref","first-page":"199","DOI":"10.1021\/cr960401q","volume":"98","author":"Mizuno N.","year":"1998","journal-title":"Chem. Rev."},{"key":"ja034085qb00017\/ja034085qb00017_1","doi-asserted-by":"crossref","first-page":"63","DOI":"10.1016\/S0926-860X(01)00830-4","volume":"222","author":"Okuhara T.","year":"2001","journal-title":"Appl. Catal., A"},{"key":"ja034085qb00018\/ja034085qb00018_1","doi-asserted-by":"crossref","first-page":"4682","DOI":"10.1021\/ja974262l","volume":"120","author":"Sasaki T.","year":"1998","journal-title":"J. Am. Chem. Soc."},{"key":"ja034085qb00019\/ja034085qb00019_1","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1039\/cc9960000229","author":"Sasaki T.","year":"1996","journal-title":"J. Chem. Soc., Chem. Commun."},{"key":"ja034085qb00020\/ja034085qb00020_1","doi-asserted-by":"crossref","first-page":"6116","DOI":"10.1021\/jp010421i","volume":"105","author":"Sasaki T.","year":"2001","journal-title":"J. Phys. Chem. B"},{"key":"ja034085qb00021\/ja034085qb00021_1","doi-asserted-by":"crossref","first-page":"1429","DOI":"10.1016\/0025-5408(81)90063-5","volume":"16","author":"Dion M.","year":"1981","journal-title":"Mater. Res. Bull."},{"key":"ja034085qb00022\/ja034085qb00022_1","doi-asserted-by":"crossref","first-page":"623","DOI":"10.1107\/S0365110X64001530","volume":"17","author":"Wadsley A. D.","year":"1964","journal-title":"Acta Crystallogr."},{"key":"ja034085qb00022\/ja034085qb00022_2","doi-asserted-by":"crossref","first-page":"1125","DOI":"10.1016\/0025-5408(79)90206-X","volume":"14","author":"Rebbah H.","year":"1979","journal-title":"Mater. Res. Bull."},{"key":"ja034085qb00023\/ja034085qb00023_1","doi-asserted-by":"crossref","first-page":"219","DOI":"10.1016\/S0926-860X(97)00203-2","volume":"165","author":"Mukai S. R.","year":"1997","journal-title":"Appl. Catal., A"},{"key":"ja034085qb00024\/ja034085qb00024_1","unstructured":"The amount of effective acid sites on HTiNbO5nanosheets was estimated by thermogravimetric analysis (TGA) and1H MAS NMR. The total amount of hydroxyl groups on 0.2 g of HTiNbO5nanosheets was estimated to be 5.7 \u00d7 10-4mol by TGA of the nanosheets after removal of adsorbed water. In the1H MAS NMR spectrum for HTiNbO5nanosheets after removal of adsorbed water, four peaks due to surface hydroxyl groups were observed at 12, 7.6, 4.9, and 1.6 ppm (see below, Figures 9 and 11), and only the peak at 7.6 ppm (14% of the total amount of hydroxyl groups) among these peaks can be assigned to strong Br\u00f8nsted acid sites available for the reactions (see below). Assuming that the peak at 7.6 ppm is attributed to active sites for cumene cracking, we estimated the amount of effective acid sites on 0.2 g of HTiNbO5nanosheets to be 5.7 \u00d7 10-4mol \u00d7 0.14 = 7.9 \u00d7 10-5mol. In the case of the SiO2\u2212Al2O3catalyst, the amount of the acid sites was obtained by transmission infrared spectroscopy of CO-adsorbed SiO2\u2212Al2O3catalyst. It has been reported that the amounts of acid sites on solid acid catalysts are determined by transmission infrared spectroscopy of CO-adsorbed catalysts,25and the total amount of acid sites on the SiO2\u2212Al2O3catalyst (0.2 g) was estimated to be 1.6 \u00d7 10-4mol. In an infrared spectrum of HTiNbO5nanosheets, several peaks due to hydroxyl groups were observed at 3640\u22123680 cm-1. However, these peaks were so broad that we could not obtain reliable information with respect to the amount of acid sites on HTiNbO5nanosheets by infrared spectroscopy."},{"key":"ja034085qb00025\/ja034085qb00025_1","doi-asserted-by":"crossref","first-page":"10573","DOI":"10.1021\/j100026a021","volume":"99","author":"Wakabayashi F.","year":"1995","journal-title":"J. Phys. Chem."},{"key":"ja034085qb00026\/ja034085qb00026_1","doi-asserted-by":"crossref","first-page":"3727","DOI":"10.1021\/ic00217a006","volume":"24","author":"Jacobson A. J.","year":"1985","journal-title":"Inorg. Chem."},{"key":"ja034085qb00026\/ja034085qb00026_2","doi-asserted-by":"crossref","first-page":"679","DOI":"10.1016\/0025-5408(90)90035-Z","volume":"25","author":"Jacobson A. J.","year":"1990","journal-title":"Mater. Res. Bull."},{"key":"ja034085qb00027\/ja034085qb00027_1","doi-asserted-by":"crossref","first-page":"427","DOI":"10.1016\/0009-2614(85)85634-7","volume":"120","author":"Ratcliffe C. I.","year":"1985","journal-title":"Chem. Phys. Lett."},{"key":"ja034085qb00028\/ja034085qb00028_1","doi-asserted-by":"crossref","first-page":"955","DOI":"10.2116\/analsci.7.955","volume":"7","author":"Hayashi S.","year":"1991","journal-title":"Anal. Sci."},{"key":"ja034085qb00029\/ja034085qb00029_1","doi-asserted-by":"crossref","first-page":"5756","DOI":"10.1039\/b005677o","volume":"2","author":"Paz\u00e9 C.","year":"2000","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ja034085qb00030\/ja034085qb00030_1","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1016\/0022-4596(82)90034-2","volume":"41","author":"Rebbah H.","year":"1982","journal-title":"J. Solid State Chem."}],"container-title":["Journal of the American Chemical Society"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.acs.org\/doi\/pdf\/10.1021\/ja034085q","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,1,9]],"date-time":"2024-01-09T20:39:26Z","timestamp":1704832766000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.acs.org\/doi\/10.1021\/ja034085q"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2003,4,4]]},"references-count":33,"journal-issue":{"issue":"18","published-print":{"date-parts":[[2003,5,1]]}},"alternative-id":["10.1021\/ja034085q"],"URL":"https:\/\/doi.org\/10.1021\/ja034085q","relation":{},"ISSN":["0002-7863","1520-5126"],"issn-type":[{"value":"0002-7863","type":"print"},{"value":"1520-5126","type":"electronic"}],"subject":[],"published":{"date-parts":[[2003,4,4]]}}}