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用程序升温表面反应(TPSR)法研究对比了在工业甲烷化镍催化剂上纯CO吸附,CO+H_2共吸附及CO+H_2在反应过程中的吸附。纯CO吸附态和CO+H_2共吸附态的TPSR谱较相似,都只有高温(350℃以上)和低温(约200℃)两个峰。而反应定态吸附态的TPSR谱有三个峰,发现其中温峰(300℃)与反应活性物种有联系。用D_2同位素研究了定态吸附态的组成,发现TPSR的三个峰的吸附态组成中都含有大量碳物种,少量的CH和CH_2物种;而且不同温度下出现的三个TPSR谱峰都含有大致接近的C,CH和CH_2物种,反映了同一物种的反应能力的差别,而不同的物种出现在同一温区内,意味着吸附物种的反应能力主要决定于金属—碳键的性质。
The temperature-programmed surface reaction (TPSR) method was used to study the adsorption of pure CO, CO + H 2 and the adsorption of CO + H 2 on industrial nickel methanation catalyst. The TPSR spectra of pure CO adsorbed and CO + H 2 co-adsorbed states are similar, with only two peaks of high temperature (above 350 ℃) and low temperature (about 200 ℃). The TPSR spectra of the stationary state of the reaction showed three peaks and found that the temperature peak (300 ℃) was related to the reactive species. The D 2 isotopes were used to study the composition of the stationary state of adsorption. It was found that all three TPSR peaks contained a large amount of carbon species and a small amount of CH and CH 2 species. The three TPSR peaks at different temperatures all contained roughly The close C, CH and CH 2 species reflect the difference in the ability of the same species to react, while the presence of different species in the same temperature region means that the reactivity of the adsorbed species is mainly determined by the nature of the metal-carbon bond.