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

Manuela C.I. Bezen; Cornelia Breitkopf; Johannes A. Lercher

doi:10.1016/j.apcata.2011.03.053

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

Manuela C.I. Bezen, Cornelia Breitkopf, Johannes A. Lercher

Chair of Chemical Technology II

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

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 Al ³⁺, 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.

Original language	English
Pages (from-to)	93-99
Number of pages	7
Journal	Applied Catalysis A: General
Volume	399
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcata.2011.03.053
State	Published - 31 May 2011

Keywords

Al MAS NMR
Hydride transfer
Propan-2-ol elimination reactions
XRD
Zn-Mg-Al mixed metal oxides

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10.1016/j.apcata.2011.03.053

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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 Al 3+, 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.",

keywords = "Al MAS NMR, Hydride transfer, Propan-2-ol elimination reactions, XRD, Zn-Mg-Al mixed metal oxides",

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year = "2011",

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TY - JOUR

T1 - On the acid-base properties of Zn-Mg-Al mixed oxides

AU - Bezen, Manuela C.I.

AU - Breitkopf, Cornelia

AU - Lercher, Johannes A.

PY - 2011/5/31

Y1 - 2011/5/31

N2 - 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 Al 3+, 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.

AB - 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 Al 3+, 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.

KW - Al MAS NMR

KW - Hydride transfer

KW - Propan-2-ol elimination reactions

KW - XRD

KW - Zn-Mg-Al mixed metal oxides

UR - https://www.scopus.com/pages/publications/79956000521

U2 - 10.1016/j.apcata.2011.03.053

DO - 10.1016/j.apcata.2011.03.053

M3 - Article

AN - SCOPUS:79956000521

SN - 0926-860X

VL - 399

SP - 93

EP - 99

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

IS - 1-2

ER -

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

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Keywords

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