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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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moo3-sno2催化剂上二甲醚低温氧化高选择性制备甲酸甲酯
, PP. 223-227
Keywords: 二甲醚,低温,选择氧化,甲酸甲酯,氧化锡,氧化钼
Abstract:
？定向设计并制备了多功能moo3-sno2催化剂,在常压连续流动固定床反应器上实现了二甲醚低温氧化高选择性制备甲酸甲酯的过程。考察了机械混合法、共沉淀法及沉淀浸渍法等不同制备方法对催化剂性能的影响。在沉淀浸渍法制备的moo3-sno2催化剂上,常压、160℃反应条件下,甲酸甲酯选择性达94.1%,dme转化率也达到了33.9%,并且产物中无cox生成。采用nh3-tpd、co2-tpd及h2-tpr对催化剂进行了表征,结果表明,表面酸性、碱性及氧化性的不同是造成催化剂反应性能差异的原因。另外,通过采用xrd、raman及tem对催化剂结构进行表征发现,晶粒粒径及金属氧化物moo3的存在状态等结构的差异是造成催化剂活性不同的主要原因。较小晶粒的催化剂和表面存在的低聚态moo3是致使催化剂活性提高的主要原因。
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