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

异质催化中催化活性的人工控制是最重要的主题之一。通过电力引起了在铁电晶体上产生的表面声波（锯）。在本研究中，采用了不同类型的锯：一种是雷利锯（R-sAW），其振动垂直于晶体表面，另一种是剪切 - 霍利底孔漏锯（SH-LSAW），平行于表面。使用了128°cut cut linbo_3和36 ﾟ截止的y cut litao_3单晶。在晶体表面的每一端，金属（CU，PD）和氧化物（NIO，TIO_2）在两种IDT电极中间蒸发，将输入和输出跨数字换能器（IDT）电极在晶体表面，金属（CU，PD）和氧化物（NIO，TIO_2）中沉积为薄膜催化剂。这些薄膜催化剂的催化活性在343-363 K下产生乙醛，增加了3-4倍，R-SAW-ON在1W时增加。 R-sAW引起了折磨的脱裂……对于Cu催化剂的反应的激活能量从55至39 kj mol^<-1>中，从42 kj mol^<-1>到29 kj Mo1^<-1>对于PD催化剂。使用10 nm厚的PD膜，SH-LSAW的活性增加接近343 K的反应。这些结果表明，SH-LSAW和R-SAW之间的催化活性增加的影响相似。掺杂的锌薄膜沉积在晶体的传播路径上。这些锯的传播产生了发光，这表明锯产生高电场的能力，估计R-SAW和1x10^4 V cm^<-1>对于SH-LSAW而言为9x10^3 V cm^<-1>。这表明高电场对催化剂激活的贡献。从本研究中可以得出结论，R-SAW和SH-LSAW都对催化活性的增加具有内在影响，并且锯的应用会导致人为控制催化功能的催化剂的发展。较少的