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本文研究了CuO-ZnO-Al_2O_3-V_2O_5低压合成甲醇催化剂的还原及钝化.结果表明:工业催化剂含约25%的碱式碳酸盐,它对活性与稳定性有良好作用.使用前如先经623K煅烧则将破坏此有利结构.将工业催化剂直接采用低氢浓度、高空速和低升温速率的阶梯式提温方式还原,可提高活性及选择性.用含氧浓度极低的氮气钝化,经再还原可基本恢复活性.本文还提出了还原过程的动力学方程.
In this paper, the reduction and passivation of CuO-ZnO-Al_2O_3-V_2O_5 low-pressure methanol synthesis catalyst were studied.The results show that the industrial catalyst contains about 25% of basic carbonate, which has a good effect on the activity and stability of the catalyst. This advantageous structure is destroyed by calcination at 623 K. The industrial catalyst can be directly activated by a stepwise temperature reduction method with low hydrogen concentration, high airspeed and low heating rate to enhance the activity and selectivity, and passivated with a nitrogen gas containing a very low oxygen concentration , And then restore the basic activity can be restored.This paper also proposed the kinetics of the reduction process.