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Preparation of Highly Active Ceramics Catalysts by Chemical Vapor Deposition for Catalytic Combustion

化学气相沉积法制备催化燃烧高活性陶瓷催化剂

基本信息

批准号：
63850168
负责人：
MISONO Makoto
金额：
$ 6.02万
依托单位：
Faculty of Engineering The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

In catalytic combustion processes, development of highly active and thermally stable ceramics catalyst is desired. In the present study, the preparations of supported mixed oxide catalysts mainly by Chemical Vapor Deposition (CVD) and Chemical Liquid Deposition (CLD) methods were tried. The results are summarized as follows :(1) Highly Dispersed LaCoO_3/ZrO_2 prepared by Chemical Liquid Deposition (CLD)LaCoO_3 highly dispersed ZrO_2 was prepared by impregnating ZrO_2 with aqueous solutions of the mixtures of La and Co acetates. The high dispersion was confirmed by IR, XRD, and TEM. This catalyst showed a very high catalytic activity for complete oxidation of propane.(2) Vanadium Oxide This Film Catalysts Prepared by CVDHighly dispersed vanadium oxide overlayers were formed on SiO_2 by CVD of VO (c_2H_5)_3 as was confirmed by XPS and XRD. Furthermore, EXAFS and XANES analyses revealed that the V_2O_5 were present as thin films. This catalyst was much more active than V_2O_5 prepared by an impregnation method for oxidative dehydrogenation of a alcohol.(3) Highly Active CoO_X Dispersed on ZrO_2 Prepared by Low-Temperture Oxygen plasmaCo (OCOCH_3)_2 dispersed on ZrO_2 was treated with oxygen which was activated in Ar-plasma.It was confirmed by infrared spectroscopy that all Co (OCOCH_3)_2 were changed to CoO_X by this treatment. This catalyst showed activities for the complete oxidation of propane much greater than Pt/Al_2O_3 and La_<0.8>Sr_<0.2>coO_3 which were reported to be excellent oxidation catalysts.These results demonstrate that CLD, CVD and utilization of oxygen-plasma were superior methods to prepare oxide-thin films on supports, which posses high catalytic performance for the catalytic combustion.

在催化燃烧过程中，需要开发高活性和热稳定性的陶瓷催化剂。本文主要尝试了化学气相沉积法（CVD）和化学液相沉积法（CLD）制备负载型复合氧化物催化剂。（1）高分散LaCoO_3/ZrO_2的化学液相沉积（CLD）法制备LaCoO_3/ZrO_2高分散LaCoO_3/ZrO_2复合材料。通过IR、XRD和TEM证实了其高分散性。该催化剂对丙烷完全氧化反应具有很高的催化活性。(2)用CVD法在SiO_2上制备了高分散的钒氧化物覆盖层，XPS和XRD证实了这一点。EXAFS和XANES分析表明，V_2O_5以薄膜形式存在。该催化剂对醇的氧化脱氢反应的活性比浸渍法制备的V_2O_5高得多。(3)低温氧等离子体法制备高活性CoO_X分散在ZrO_2上用Ar等离子体活化的氧处理分散在ZrO_2上的Co（OCOCH_3）_2，红外光谱分析证实，Co（OCOCH_3）_2经此处理后全部转化为CoO_X。该催化剂的丙烷完全氧化活性远高于Pt/Al_2O_3和La_<0.8>Sr_<0.2>coO_3，表明化学气相沉积法、化学气相沉积法和氧等离子体法是制备氧化物薄膜的上级方法，具有较高的催化燃烧性能。