Cu基甲醇合成催化剂在两种模拟工业合成气中反应的结构变化及稳定性研究

Study on structure change and stability of Cu-based methanol synthesis catalysts in simulated reaction of two industrial syngas

不同原料转化得到的合成气的CO_(2)含量有明显差异,但均能通过传统甲醇催化剂的催化反应来制甲醇。为了研究不同CO_(2)含量的合成气对催化剂结构和性能稳定性的影响,采用模拟煤气化和天然气转化制成的合成气,在工业尺寸的列管式夹套反应器上进行了甲醇合成反应,研究了原颗粒工业催化剂在使用前后微观粒子和催化剂性能稳定性的变化。结果表明,5种原颗粒工业催化剂使用前后的Cu和ZnO晶粒尺寸均增大,且在模拟天然气转化制成的合成气条件下,催化剂中Cu和ZnO晶粒尺寸增大速率更快,催化剂整体性能的发挥受到限制,不利于保持催化剂性能的稳定。高CO_(2)含量更容易破坏Cu+的稳定性,并且导致Zn物种形态的转变。

There are significant differences in the CO_(2)content of the synthesis gas obtained from different raw materials,but they can all be converted to methanol through the catalysis of traditional methanol catalysts.In order to study the effect of syngas with different CO_(2)content on the structure and performance stability of the catalysts,methanol synthesis was performed in an industrial-sized tubular jacketed reactor using simulated coal gasification and natural gas conversion syngas,and the changes of microparticles and catalyst performance stability of the original particle industrial catalysts before and after use were studied.The results show that the sizes of Cu and ZnO particles increase before and after the use of the five original industrial catalysts,and the sizes of Cu and ZnO particles increase faster under the conditions of synthetic gas produced by natural gas conversion.The overall performance of catalysts is limited,which is not conducive to maintaining the stability of catalyst performance.High CO_(2)content is more likely to destroy the stability of Cu+and lead to the transformation of Zn species morphology.