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Artificial Control of Catalytic Activity of Thin Film Catalysts by Surface Acoustic Waves

表面声波人工控制薄膜催化剂的催化活性

基本信息

批准号：
03453006
负责人：
INOUE Yasunobu
金额：
$ 3.46万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03453006/
关键词：
Surface Acoustic Wave Thin Film Catalysts Artificial Control of Catalytic Activity Cu catalyst Pd catalyst Ethanol Oxidation エタノ-ル酸化反応酸化ニッケル触媒作用

项目摘要

The artificial control of catalytic activities in heterogeneous catalysis is one of the most important topics. Surface acoustic waves(SAWs) generated on ferroelectric crystals by electric power have been drawn attention. In the present study, different types of the SAWs were employed: one is a Rayleigh SAW(R-SAW) with the vibration vertical to the crystal surface, and the other is a shear-horizontal leaky SAW(SH-LSAW) with vibration parallel to the surface. A 128ﾟ-rotated Y cut LiNbO_3 and a 36ﾟ-rotated Y cut LiTaO_3 single crystal were used. The input and output interdigital transducer(IDT) electrodes were photolithographically fabricated on each end of the crystal surface, Metals(Cu,Pd) and oxides(NiO, TiO_2) were deposited as a thin film catalyst by evaporation in the middle of two IDT electrodes. The catalytic activity of these thin film catalysts for ehtanol oxidation to produce acetaldehyde at 343-363 K increased by a factor of 3-4 with R-SAW-on at 1W. The R-SAW caused de- crease … More s in the activation energy of the reaction from 55 to 39 KJ mol^<-1> for the Cu catalyst and from 42 KJ mol^<-1> to 29 KJ mo1^<-1> for the Pd catalyst. With a 10 nm-thick Pd film, the activity increase by the SH-LSAW was close to 3 for the reaction at 343 K. These results indicate that the effects upon the increase of the catalytic activity are similar between the SH-LSAW and the R-SAW. A Cu-doped ZnS thin film was deposited on the propagation path of the crystal. The propagation of these SAWs gave rise to luminescence, which indicated the ability of the SAWs to generate high electric fields which were estinated to be 9x10^3 V cm^<-1> for the R-SAW and 1x10^4 V cm^<-1> for the SH-LSAW. This indicates the contribution of the high electric field to the catalyst activation. From the present study, it is concluded that both the R-SAW and the SH-LSAW have the intrinsic effects on the increase of catalytic activity, and the application of SAWs leads to the development of catalysts whose catalytic functions are artificially controlled. Less

多相催化中催化活性的人工控制是最重要的课题之一。通过电力在铁电晶体上产生的表面声波（SAW）已引起人们的关注。在本研究中，采用了不同类型的声表面波：一种是振动垂直于晶体表面的瑞利声表面波（R-SAW），另一种是振动平行于表面的剪切水平泄漏声表面波（SH-LSAW）。使用128°旋转Y切割LiNbO_3和36°旋转Y切割LiTaO_3单晶。在晶体表面的两端采用光刻技术制作了输入和输出叉指换能器(IDT)电极,在两个IDT电极中间通过蒸发沉积金属(Cu,Pd)和氧化物(NiO,TiO_2)作为薄膜催化剂。当 R-SAW-on 功率为 1W 时，这些薄膜催化剂在 343-363 K 下对乙醇氧化产生乙醛的催化活性增加了 3-4 倍。 R-SAW 使 Cu 催化剂的反应活化能从 55 KJ mol^<-1> 降低至 39 KJ mol^<-1>，对于 Pd 催化剂，反应活化能从 42 KJ mol^<-1> 降低至 29 KJ mo1^<-1>。对于 10 nm 厚的 Pd 膜，在 343 K 下反应，SH-LSAW 的活性增加接近 3。这些结果表明 SH-LSAW 和 R-SAW 对催化活性增加的影响相似。在晶体的传播路径上沉积了掺杂 Cu 的 ZnS 薄膜。这些 SAW 的传播引起发光，这表明 SAW 能够产生高电场，预计 R-SAW 为 9x10^3 V cm^<-1>，SH-LSAW 为 1x10^4 V cm^<-1>。这表明高电场对催化剂活化的贡献。从目前的研究来看，R-SAW和SH-LSAW对催化活性的提高都有内在的影响，而SAW的应用导致了催化功能受人为控制的催化剂的发展。较少的