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采用并流淤浆混合法制备了一系列具有不同铜锌铝比的铜基甲醇合成催化剂CuO/ZnO/Al2O3,测试了其催化性能(甲醇收率和CO转化率)及物相结构,并对该制备方法进行评价。Cu∶Zn∶Al摩尔比为4∶5∶1的铜基催化剂显示了最好的催化活性。通过对催化剂前驱物煅烧过程进行DTA分析及对前驱物进行XRD分析表明,催化剂前驱物的物相与Al2O3的量有关。当Al2O3的量较低时,前驱物的物相以(Cu0.3Zn0.7)5(CO3)2(OH)6为主;当Al2O3的量较高时,前驱物中物相(Cu0.3Zn0.7)5(CO3)2(OH)6的量下降,而物相Cu2CO3(OH)2的量增加。物相(Cu0.3Zn0.7)5(CO3)2(OH)6对终态催化剂的活性是十分有利的。
A series of CuO / ZnO / Al2O3 catalysts for Cu-based methanol synthesis with different ratios of copper, zinc and aluminum were prepared by the cocurrent slurry mixing method. Their catalytic performances (methanol yield and CO conversion) and their phase structure were tested. The preparation method was evaluated. The Cu-based catalyst with a Cu: Zn: Al molar ratio of 4: 5: 1 shows the best catalytic activity. DTA analysis of the catalyst precursor calcination process and XRD analysis of the precursor showed that the phase of the catalyst precursor was related to the amount of Al2O3. When the content of Al2O3 is low, the phase of the precursor is (Cu0.3Zn0.7) 5 (CO3) 2 (OH) 6. When the content of Al2O3 is high, the phase of the precursor (Cu0.3Zn0 .7) The amount of 5 (CO3) 2 (OH) 6 decreased whereas the amount of the phase Cu2CO3 (OH) 2 increased. The phase (Cu0.3Zn0.7) 5 (CO3) 2 (OH) 6 is very favorable for the activity of the final catalyst.