【摘要】 本文报导了Cu-Gr-SiO₂和Cu-Cr-Mn-SiO₂催化剂的ESR谱。焙烧后的催化剂出现Cu²⁺和Cr⁵⁺信号,活性状态是Cu⁰+Cr³⁺,催化剂的活性中心可能是Cu⁰微粒。反应后的催化剂呈现出S型信号和积炭信号。多数的实验谱是在常温用常规方法纪录的。部分实验是在谐振腔中直接进行化学反应的动态条件下纪录的。更多还原

【Abstract】 The new catalysts, Cu-Cr-SiO₂ and Cu-Cr-Mn-SiO₂, are used for the reduction of nitrobenzene to aniline. It is well shown that the catalysts reveal Cu²⁺ and Cr⁵⁺ signals after being catcined at 400℃ or more and reveal strong S-shaped Cr³⁺ signal with a sharp narrow carbon signal overlapped at its center after reduction reaction. Therefore the active state of the catalysts might be Cu⁰+Cr³⁺, and the active centers might be Cu⁰ fine particles.Most of the spectra were recorded with routine procedure under room temperature, while some were recorded under dynamic conditions during the course of catalytic reaction in the cavity resonator. The main ESR parameters are as follows:更多还原