铜锌原子比对CuO-ZnO/Al_2O_3催化剂合成甲醇性能的影响  

Influence of Cu/Zn Atomic Ratio on Properties of CuO-ZnO/Al_2O_3 Catalysts in Methanol Synthesis

作　　者：王丽丽[1] 丁雯[1] 刘迎伟[2] 方维平[1] 杨意泉[2] 

机构地区：[1]厦门大学化学化工学院化学工程与生物工程系,福建厦门361005 [2]厦门大学化学化工学院化学系醇醚酯清洁生产国家重点实验室,福建厦门361005

出　　处：《石油化工》2010年第7期724-728,共5页Petrochemical Technology

基　　金：福建省科技计划项目(2008H0034);大唐国际化工技术研究院有限公司委托项目(0042-K81009)

摘　　要：以铝乳液的形式引入Al,采用反加共沉淀法制备了一系列Cu与Zn的原子比(简称Cu/Zn原子比)不同的CuO-ZnO/Al2O3催化剂;以合成气为原料,在固定床微型连续流动反应器中评价了CuO-ZnO/Al2O3催化剂合成甲醇的性能;采用XRD、H2-TPR和BET等方法对催化剂进行了表征,考察了Cu/Zn原子比对CuO-ZnO/Al2O3催化剂合成甲醇性能的影响。实验结果表明,Cu/Zn原子比的变化对催化剂前体的物相组成和催化剂的活性有明显影响;当Cu/Zn原子比为3时,催化剂的初活性和耐热后活性最高,其前体中含有较多的锌-孔雀石相((Cu,Zn)2CO3(OH)2),该物相分解时生成还原温度较低的CuO-ZnO固溶体,使Cu与Zn的相互作用增强,提高了催化剂的活性。A series of CuO-ZnO/Al2O3 catalysts with different Cu/Zn atomic ratios were prepared by the reverse co-precipitation method, in which AI was added in the form of aluminum emulsion. The catalytic property of CuO-ZnO/Al2O3 catalysts for methanol synthesis from syngas was evaluated in a continuous flow fixed-bed microreactor. The effects of Cu/Zn atomic ratios on properties of the CuO- ZnO/Al2O3 catalysts in the methanol synthesis were studied and the catalysts were characterized by means of XRD, H2-TPR and BET. The Cu/Zn atomic ratio significantly influenced both the phase structures of the catalyst precursors and the activities of the catalysts. When the Cu/Zn atomic ratio was 3, the catalyst activities before and after thermal test were the highest, and the corresponding precursors contained relatively much Zn-malachite phase [ （ Cu, Zn） 2 CO3 （OH） 2 ]. CuO-ZnO sosoloid with low reduction temperature was obtained from Zn-malachite phase during decomposition, which could enhance the interaction between Cu and Zn, so the catalyst activity was improved.

关 键 词：铜基催化剂 合成甲醇 铜与锌原子比 铝乳液 锌-孔雀石相 

分 类 号：TQ426.8[化学工程]