以乙酰丙酮锌(II)为原料合成氧化镁氧化锌改性固体碱催化剂的研究

H. Matsuhashi
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引用次数: 0

摘要

通过在MgO和Mg(OH)2表面的极性和非极性有机溶剂中沉积乙酰丙酮锌(Zn(acac)2),制备了10 mol% ZnO修饰MgO (ZnO/MgO)固体碱催化剂。在299 K条件下,锌(acac)2改性MgO的碱催化后醛醇反应(二丙酮醇(4-羟基-4-甲基-2-戊酮)分解为丙酮)的活性高于未改性Mg(OH)2热分解制备的MgO的活性。在Mg(OH)2上沉积Zn(acac)2制备的催化剂活性低于未改性的MgO。x射线衍射图分析显示,在催化活性高的样品中存在高强度的ZnO单元。在高活性催化剂中,氧化锌以大颗粒形式沉积在氧化镁表面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synthesis of a Solid Base Catalyst Formed from Zinc(II) Acetylacetonate and Consisting of MgO Modified with ZnO
Solid base catalysts consisting of MgO modified with 10 mol% ZnO (ZnO/MgO) were prepared by depositing zinc(II) acetylacetonate (Zn(acac)2) in polar and nonpolar organic solvents on the surface of MgO and Mg(OH)2. The process was followed by thermal decomposition in air at 773 K over a period of 3 h. The activity of MgO modified with Zn(acac)2 for base-catalyzed retroaldol reaction (the decomposition of diacetone alcohol (4-hydroxy-4-methyl-2-pentanone) to acetone) at 299 K was higher than the activity of unmodified MgO prepared by thermal decomposition of Mg(OH)2. The activity of the catalysts prepared by depositing Zn(acac)2 on Mg(OH)2 was lower than that of unmodified MgO. Analysis of X-ray diffraction patterns revealed the presence of highly intense peaks, which were assigned to the ZnO units in the samples with high catalytic activity. ZnO was deposited in the form of large particles on the surface of MgO in the catalysts with high activity.
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