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TPR-TPO是一种表征负载或非负载的金属或金属氧化物催化剂的高灵敏度技术,用此技术研究甲醇直接俄氢制无水甲醛负载型铜基催化剂Cu/SiO_2和Cu-Cr/SiO_2,动力学活性评价表明Cu-Cr/SiO_2的活性和单程寿命明显优于Cu/SiO_2,XPS和TPR-TPO谱测定,以及催化剂的再生实验结果表明,Cu的还原以及表面积炭是活性下降的主要原因,在高温条件下,铬组份可能以铬酸铜形式存在,使部分铜难还原,并阻碍了铜微晶的聚集。
TPR-TPO is a kind of high sensitivity technology for characterization of supported or unloaded metal or metal oxide catalysts. Using this technology, we studied the direct methanol hydrogenation of methanol to Cu / SiO 2 and Cu-Cr / SiO 2, Kinetic activity evaluation showed that the activity and one-way life of Cu-Cr / SiO 2 were significantly better than that of Cu / SiO 2, XPS and TPR-TPO spectra, and the catalyst regeneration experiments showed that Cu reduction and surface carbon deposition were the main reasons for the decrease of activity Under high temperature conditions, the chromium component may exist in the form of copper chromate, which makes it difficult to reduce part of the copper and hinders the aggregation of copper crystallites.