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OALib Journal期刊
ISSN: 2333-9721
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脱铝usy催化剂上柠檬酸三丁酯的合成
DOI: 10.3969/j.issn.1671-7627.2013.01.020, PP. 1-96
Keywords: 柠檬酸,正丁醇,柠檬酸三丁酯,酯化反应,超稳y沸石
Abstract:
对超稳y沸石(usy)进行水蒸气和硝酸铵水溶液脱铝,并采用过量浸渍法制备脱铝usy负载磷钨酸(pw)催化剂,使用氨程序升温脱附(nh3-tpd)技术表征其酸性质,并在柠檬酸与正丁醇的酯化反应中考察其催化性能。结果表明:催化剂的酸量和酸强度与usy脱铝程度相关,水蒸气脱铝后的usy1具有较大酸量和适宜的酸强度。usy1催化剂具有最大的柠檬酸转化率(97.3%),柠檬酸正三丁酯的选择性为98.8%,适宜反应条件为反应温度110℃,反应时间90min;反应4次后柠檬酸的转化率保持在80%以上,产品选择性高于98%。
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