化学
催化作用
吸附
粘土矿物
无机化学
化学工程
多相催化
蒙脱石
高岭石
沸石
有机化学
矿物学
工程类
标识
DOI:10.1016/0021-9517(85)90219-2
摘要
Abstract The thermal decomposition of a number of anionic clay minerals belonging to the pyroaurites-jogrenite group, such as hydrotalcite (Mg6Al2(OH)16(CO2−3) · 4H2O), results in a product (approximately Mg6Al2O8(OH−)2) which is a fairly strong base (pKa ≤ 35) and a useful catalyst for vapor-phase aldol condensations. Replacement of Mg by Fe, Co, Ni, and Zn, and/or replacement of Al by Fe and Cr also results in isomorphous double hydroxides which, on heat treatment, are catalytically active. A rational method of synthesizing these materials having controlled surface areas has been devised. The effect of the thermal decomposition temperature, Mg Al ratio, isomorphous metal cation substitution, and interstitial anion nature on the rate and efficiency of acetone oligomerization has been examined. These materials will also catalyze HD exchange of acetone and toluene but not of n-propylbenzene or cyclohexane (300°C, LHSV ~1). They are relatively poor catalysts for olefin isomerization as well as aromatization of 1,4-cyclohexadiene and limonene.
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