A Fundamental Study on Effects of Electric Field on the Reaction Field of Electro-conductive Plate Type Catalyst

外加电场对催化反应场的影响有望使(1)通过直接提供或切断焦耳热来控制反应温度，(2)由于半导体催化剂电子结构的变化而引起催化活性的变化。本研究的最终目的是通过有效利用导电或半导体催化剂材料，为每个特殊反应体系设计最佳催化剂和最佳反应器。我们制备了两种类型的催化剂，(A)氧化Ru(1992)和(B)氧化锌和氧化铋的混合物(1993)。两种催化剂在伏安曲线上均表现出“变储效应”。本文研究了外加电场下丙酮氧化(1000ppm/空气，275-325ﾟC)的反应活性。结果表明，激活能和碰撞因子均随外加电压或电流的变化而变化，且在外加电压附近变化不连续。这些催化活性的变化被认为是由于外加电压引起催化剂本体和表面固相状态变化的结果。

The effects of electric field applied on catalytic reaction fields are expected to give (1) Easy control of reaction temperature by direct supply or cut-off of Joule heat and (2) Change of catalytic activity resulted by the change in electric structure of the semiconductor catalyst. The ultimate purposes of this study are to design best catalyst and best reactor for each special reaction system by making effective use of electoro-conductive or semiconductor catalyst materials.We prepared two types of catalyst, (a) Ruthenium oxide (1992), and (b) mixture of Zinc oxide and Bismuth oxide (1993). Both catalyst showed 'varistore effect' on voltage-current (V-A) profiles. The voltage at which the current jumps up on the V-A-Profile is called as 'varistore voltage' Reaction activities for acetone oxidation (1000ppm/air, 275-325ﾟC) under applied electricity were studied. It was shown that both of the activation energy and collision factor changed with applied voltage or current, and the changes were discontinuous around the varistore voltage. These changes of catalytic activities were considered to be resulted by the changes in the solid state of the catlyst bulk and surface induced by the applied voltage.