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研究了从合成气出发,低压法合成甲醇用的铜系催化剂制备方法。发现用共沉淀法制备Cu、Zn、Cr或Cu、Zn、Al多组份催化剂,加料方式可影响到催化剂物性结构,从而使催化剂活性,耐热性有明显差别。催化活性与铜的晶粒大小有关,活性和晶粒大小的关系由于制备方法不同,有不同的规律性。用碳酸钠做沉淀剂的一步法、二步法及用碳酸氢铵做沉淀剂的方法都制得了高活性催化剂。其中用碳酸钠的二步法,由于注意了铜和锌的高度分散及形成热稳定性高的载体,得到了最好的活性结果。
The preparation method of copper catalyst for synthesis of methanol from syngas was studied. It is found that Cu, Zn, Cr or Cu, Zn, Al multi-component catalysts prepared by coprecipitation method can affect the physical properties of the catalysts and make the catalyst activity and heat resistance significantly different. The catalytic activity is related to the grain size of copper. The relationship between the activity and the grain size has different regularities due to different preparation methods. Using sodium carbonate as precipitant one-step method, two-step method and using ammonium bicarbonate as precipitating agent are prepared by high activity catalyst. Among them, the two-step method with sodium carbonate gave the best activity results due to the attention given to the high dispersion of copper and zinc and the formation of a carrier with high thermal stability.