Please use this identifier to cite or link to this item: https://doi.org/10.1016/S1387-1811(99)00277-2
DC FieldValue
dc.titleThe effect of digestion on the surface area and porosity of alumina
dc.contributor.authorChuah, G.K.
dc.contributor.authorJaenicke, S.
dc.contributor.authorXu, T.H.
dc.date.accessioned2014-10-16T08:45:16Z
dc.date.available2014-10-16T08:45:16Z
dc.date.issued2000-06
dc.identifier.citationChuah, G.K., Jaenicke, S., Xu, T.H. (2000-06). The effect of digestion on the surface area and porosity of alumina. Microporous and Mesoporous Materials 37 (3) : 345-353. ScholarBank@NUS Repository. https://doi.org/10.1016/S1387-1811(99)00277-2
dc.identifier.issn13871811
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/95224
dc.description.abstractThe stability of gamma alumina with respect to phase transitions and loss of surface area can be greatly improved by digestion of the aluminium hydroxide precursor. Pseudoboehmite (aluminium hydroxide) was formed by precipitating aluminium nitrate with ammonium hydroxide at pH 6. The freshly precipitated gel has a very low surface area, but the surface area increases after digestion of the hydroxide in the mother liquour. Digestion leads to a 'drier' hydroxide as shown by thermogravimetry. After calcination to 500°C, the resulting alumina has a surface area of 230 to 310 m2 g-1, depending on the length of digestion of the hydroxide. Aluminas prepared from aged precursors have better thermal stability than those prepared without the digestion step. The digested alumina was able to withstand calcination to 1200°C for 12 h, and maintained a surface area of ~ 68 m2 g-1. The transformation to the alpha phase is delayed in the digested samples. The effect of digestion on the surface area and improved thermal stability are explained on the basis of a reduction in the number of defect sites responsible for surface diffusion. (C) 2000 Elsevier Science B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/S1387-1811(99)00277-2
dc.sourceScopus
dc.subjectAlumina
dc.subjectDigestion of aluminium hydroxides
dc.subjectHigh surface area
dc.subjectPhase transformation
dc.subjectThermal stability
dc.typeArticle
dc.contributor.departmentCHEMISTRY
dc.description.doi10.1016/S1387-1811(99)00277-2
dc.description.sourcetitleMicroporous and Mesoporous Materials
dc.description.volume37
dc.description.issue3
dc.description.page345-353
dc.description.codenMIMMF
dc.identifier.isiut000087200900008
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