uni-leipzig-open-access/json/ma16083047

{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,12,10]],"date-time":"2023-12-10T17:10:28Z","timestamp":1702228228460},"reference-count":29,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2023,4,12]],"date-time":"2023-04-12T00:00:00Z","timestamp":1681257600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Leipzig University"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>When impregnated with manganiferous precursors, \u03b3-Al2O3 may be converted into \u03b1-Al2O3 under relatively mild and energy-saving conditions. In this work, a manganese assisted conversion to corundum at temperatures as low as 800 \u00b0C is investigated. To observe the alumina phase transition, XRD and solid-state 27Al-MAS-NMR are applied. By post-synthetical treatment in concentrated HCl, residual manganese is removed up to 3 wt.-%. Thereby, \u03b1-Al2O3 with a high specific surface area of 56 m2 g\u22121 is obtained after complete conversion. Just as for transition alumina, thermal stability is an important issue for corundum. Long-term stability tests were performed at 750 \u00b0C for 7 days. Although highly porous corundum was synthesized, the porosity decreased with time at common process temperatures.<\/jats:p>","DOI":"10.3390\/ma16083047","type":"journal-article","created":{"date-parts":[[2023,4,13]],"date-time":"2023-04-13T06:09:21Z","timestamp":1681366161000},"page":"3047","source":"Crossref","is-referenced-by-count":0,"title":["Towards High Surface Area \u03b1-Al2O3\u2013Mn-Assisted Low Temperature Transformation"],"prefix":"10.3390","volume":"16","author":[{"given":"Tim","family":"J\u00e4hnichen","sequence":"first","affiliation":[{"name":"Institute of Chemical Technology, Leipzig University, Linn\u00e9str. 3, D-04103 Leipzig, Germany"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-8322-5568","authenticated-orcid":false,"given":"Simon","family":"Carstens","sequence":"additional","affiliation":[{"name":"Institute of Chemical Technology, Leipzig University, Linn\u00e9str. 3, D-04103 Leipzig, Germany"}]},{"given":"Maximilian","family":"Franz","sequence":"additional","affiliation":[{"name":"Institute of Chemical Technology, Leipzig University, Linn\u00e9str. 3, D-04103 Leipzig, Germany"}]},{"given":"Otto","family":"Laufer","sequence":"additional","affiliation":[{"name":"Institute of Chemical Technology, Leipzig University, Linn\u00e9str. 3, D-04103 Leipzig, Germany"}]},{"ORCID":"http:\/\/orcid.org\/0000-0001-9092-0879","authenticated-orcid":false,"given":"Marianne","family":"Wenzel","sequence":"additional","affiliation":[{"name":"Institute of Analytical Chemistry, Leipzig University, Linn\u00e9str. 3, D-04103 Leipzig, Germany"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-7800-7443","authenticated-orcid":false,"given":"J\u00f6rg","family":"Matysik","sequence":"additional","affiliation":[{"name":"Institute of Analytical Chemistry, Leipzig University, Linn\u00e9str. 3, D-04103 Leipzig, Germany"}]},{"given":"Dirk","family":"Enke","sequence":"additional","affiliation":[{"name":"Institute of Chemical Technology, Leipzig University, Linn\u00e9str. 3, D-04103 Leipzig, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Bartholomew, C.H., and Farrauto, R.J. 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