摘要
应用探针分子吸附研究硫化态的钼基催化剂上(CO+H_2)的甲烷化反应,最早是由Weller等于1977年提出的低温氧吸附开始的,此后一直是很活跃的研究课题之一.大多数作者认为低温氧吸附量与甲烷化活性有着线性关系.然而,已知O_2既非反应物亦非产物,且在室温或低温下吸附,因而用O_2作为探针分子是间接的.近年来已有少数作者对H_2的吸附,程序升温脱附(TPD)以及低温下CO的吸附进行了研究.
The adsorption and the temperature programmed desorption (TPD) of CO on sulfided MoO3/γ-Al2O3 and MoO3/ZrO2 catalysts were investigated. A turning point of CO uptake was observed on both the two catalysts, and the temperature of the turning point coincides with the starting temperature of methanation activity. Accord-ng to the TPD spectra, the desorption energy of adsorbed CO at lower temperature is higher than those at higher temperature. The CO uptake at the temperature above turning point and the methanation activity exhibit a linear relation. It implies that the low energy state of CO adsorption is the active adsorption state.
基金
国家自然科学基金
