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的陶瓷催化剂。本研究主要尝试采用化学气相沉积（CVD）和化学液体沉积（CLD）方法制备负载型混合氧化物催化剂。主要研究结果如下: (1)化学液体沉积法制备高分散LaCoO_3/ZrO_2 用乙酸La和Co的混合物水溶液浸渍ZrO_2制备了LaCoO_3高分散ZrO_2。通过IR、XRD和TEM证实了高分散性。该催化剂对丙烷的完全氧化表现出很高的催化活性。(2)CVD法制备的氧化钒薄膜催化剂经XPS和XRD证实,VO(c_2H_5)_3的CVD法在SiO_2上形成了高度分散的氧化钒薄膜。此外，EXAFS 和 XANES 分析表明 V_2O_5 以薄膜形式存在。该催化剂比浸渍法制备的醇氧化脱氢催化剂V_2O_5活性高得多。(3)低温氧等离子体制备高活性ZrO_2分散CoO_X用氧气处理ZrO_2分散Co(OCOCH_3)_2并活化红外光谱证实Co(OCOCH_3)_2全部转变为CoO_X这种治疗。该催化剂对丙烷的完全氧化活性远高于Pt/Al_2O_3和La_<0.8>Sr_<0.2>coO_3等优异的氧化催化剂。这些结果表明CLD、CVD和氧等离子体的利用均优于Pt/Al_2O_3和La_<0.8>Sr_<0.2>coO_3。方法在载体上制备氧化物薄膜，该薄膜对催化燃烧具有较高的催化性能。