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On the acid–base properties of Zn–Mg–Al mixed oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
41433 45889 2011 7 PDF Available
Title
On the acid–base properties of Zn–Mg–Al mixed oxides
Abstract

The influence of Zn2+ cation substitution in Mg–Al mixed oxides is explored in the Zn2+ concentration range from 20 to 60 mol%. The mixed oxides are derived by calcination of layered double hydroxide precursors. Structural analyses by XRD and 27Al MAS NMR show that Al3+, Mg2+ and Zn2+ cations are well dispersed among the oxide phases. The acid site concentration increases with increasing zinc content, while the concentration of basic sites decreases compared to Zn2+ free mixed oxides. Acetone is the primary reaction product of propan-2-ol elimination with all zinc containing oxides. This suggests that the high activity for dehydrogenation of propan-2-ol is related to the pronounced hydride abstraction ability of Zn2+ cations and not to an enhanced strength or concentration of basic sites.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (147 K)Download as PowerPoint slideHighlights► Zn2+ cation substitution in Mg–Al mixed oxides induces a higher concentration of Lewis acid sites. ► High activity for dehydrogenation of propan-2-ol is related to the pronounced hydride abstraction ability of Zn2+ cations. ► Strength and concentration of basic sites decreases by substitution of Zn2+ cations in Mg–Al mixed oxides.

Keywords
Zn–Mg–Al mixed metal oxides; XRD; 27Al MAS NMR; Propan-2-ol elimination reactions; Hydride transfer
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On the acid–base properties of Zn–Mg–Al mixed oxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 399, Issues 1–2, 31 May 2011, Pages 93–99
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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