TiO2 and ZrO2 crystals in SBA-15 silica:: performance of Pt/TiO2(ZrO2)/SBA-15 catalysts in ethyl acetate combustion

被引：46

作者：

Wang, XG

Landau, MV ^{[1
]}

Rotter, H

Vradman, L

Wolfson, A

Erenburg, A

机构：

[1] Ben Gurion Univ Negev, Dept Chem Engn, Blechner Ctr Appl Catalysis & Proc Dev, IL-84105 Beer Sheva, Israel

[2] Negev Acad Coll Engn, Dept Chem Engn, IL-84100 Beer Sheva, Israel

来源：

JOURNAL OF CATALYSIS | 2004年 / 222卷 / 02期

基金：

以色列科学基金会;

关键词：

mesostructured silica; titania; zirconia; platinum; ethyl acetate; combustion; nanocrystals;

D O I：

10.1016/j.jcat.2003.12.003

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

TiO2 (40-64 wt%) and ZrO2 (48-62 wt%) were inserted in SBA-15 mesostructured silica by chemical solution decomposition or hydrolysis of the corresponding alkoxides inside the host pores. It yielded composites with 85-94% TiO2 crystallinity (anatase) and > 95% crystallinity of ZrO2 (tetragonal phase). The 4.5 nm (ZrO2) or 5.0 and 8.5 turn (TiO2) nanocrystals did not block the SBA-15 pores, and their surface was fully accessible for adsorbed nitrogen or ethyl acetate molecules. After deposition of 0.3 wt% Pt the activity of Ti(Zr)O-2/SBA-15 materials in ethyl acetate combustion was proportional to the surface area of the corresponding transition metal oxide nanoparticles, being a function of their loading and crystal size. The platinized composite materials displayed 1.7-3 times higher activity compared with platinum on bulk Ti(Zr)O-2 oxides prepared by the same methods and two orders of magnitude higher activity relative to Pt/SBA-15 and Pt/gamma-Al2O3 catalysts. (C) 2003 Elsevier Inc. All rights reserved.

引用

页码：565 / 571

页数：7

共 27 条

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