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用H_2-O_2滴定、X射线衍射、透射电镜、带能谱的扫描透射电镜、氢还原下的热分析及正电子湮没寿命测定等技术表征了负载型钯催化剂,并在常压下,测定了5.1%Pd/LaO,4.2%Pd/SiO_2和6.3%La-4.9Pd/SiO_2对CO_(2+)H_2和CO+H_2生成甲醇和甲烷的动力学行为和催化活性,揭示了催化活性上存在显著差异的主要原因是金属与载体间存在相互作用或助催剂镧的作用,并用瞬变应答方法探讨了由CO_2+H_2或CO+H_2合成甲醇可能的反应中间体。
The supported palladium catalysts were characterized by H 2 O 2 titration, X-ray diffraction, transmission electron microscopy, scanning electron microscopy with energy dispersive spectroscopy, thermal analysis by hydrogen reduction and positron annihilation lifetime measurement. Under normal pressure, The kinetic behavior and catalytic activity of 5.1% Pd / LaO, 4.2% Pd / SiO 2 and 6.3% La-4.9Pd / SiO 2 for the production of methanol and methane from CO 2 H 2 and CO + H 2 revealed significant catalytic activity The main reason for the difference is the interaction between metal and support or lanthanum as promoter, and the potential reaction intermediates for the synthesis of methanol from CO_2 + H_2 or CO + H_2 are discussed by transient response method.