{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T11:11:19Z","timestamp":1788779479506,"version":"build-2803163510"},"reference-count":45,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2026,9,6]],"date-time":"2026-09-06T00:00:00Z","timestamp":1788652800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Hiratsuka City Industry-Academia Collaborative Research Commercialization Support"},{"name":"Kanto Yakin Kogyo Co., Ltd."},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["JP24K08249"],"award-info":[{"award-number":["JP24K08249"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Calcium looping (CaL) is a CO2 capture technology based on the reversible carbonation of calcium salts. Calcium-based materials are highly reactive with CO2 and are generated as by-products or waste across a wide range of industries\u2014such as cement, steel, and fisheries\u2014leading to expectations that the calcium looping (CaL) process can be implemented at a low cost. However, a key challenge remains in the regeneration step: releasing CO2 from CaCO3, the carbonated form of the sorbent, and returning it to a reusable state conventionally requires calcination at around 700 \u00b0C, which imposes a substantial energy penalty. This study investigates the decomposition of solid-phase calcium carbonate (CaCO3) using Ni-supported composites under a hydrogen atmosphere at industrial waste heat temperatures. TPD-MS confirmed CO2 release below 250 \u00b0C, far lower than 700 \u00b0C, the typical decomposition temperature of CaCO3. The XRD and XPS results showed that CaCO3 was partially converted to Ca(OH)2 in the surface region. In situ DRIFTS measurements revealed a decrease in the CO32\u2212 signal upon heating metal oxide\/CaCO3 composites under a hydrogen atmosphere. The magnitude of decrease in the CO32\u2212 signal was significant in Ni-loaded CaCO3 compared to Cu-loaded CaCO3, suggesting a difference in hydrogen dissociation ability of loaded metals.<\/jats:p>","DOI":"10.3390\/ma19173795","type":"journal-article","created":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T10:30:46Z","timestamp":1788777046000},"page":"3795","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Low-Temperature Decomposition of CaCO3 in NiO\/CaCO3 and CuO\/CaCO3 Powder Under H2 at Industrial Waste Heat Temperatures"],"prefix":"10.3390","volume":"19","author":[{"given":"Tomoaki","family":"Yoshida","sequence":"first","affiliation":[{"name":"Graduate School of Science and Technology, Tokai University, Hiratsuka 259-1292, Japan"},{"name":"Micro\/Nano Technology Center, Tokai University, Hiratsuka 259-1292, Japan"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"conceptualization","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1686-0489","authenticated-orcid":false,"given":"Ryota","family":"Gemma","sequence":"additional","affiliation":[{"name":"Graduate School of Science and Technology, Tokai University, Hiratsuka 259-1292, Japan"},{"name":"Micro\/Nano Technology Center, Tokai University, Hiratsuka 259-1292, Japan"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,6]]},"reference":[{"key":"ref_1","unstructured":"Core Writing Team, Lee, H., and Romero, J. 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