铌改性HZSM-5分子筛催化环己烯水合反应研究

摘要采用草酸铌氨为改性剂，研究了担载不同铌含量的Nb/HZSM-5分子筛的表面酸性以及环己烯水合反应的催化活性和选择性。XRD和BET分析表明：Nb₂O₅在HZSM-5呈高度分散状态，适宜负载量时，改性Nb/HZSM-5分子筛保持较好的结构特征； Py-TPD分析表明：铌组元的引入，避免了脱羟基作用使沸石分子筛的酸性降低，增加了分子筛的骨架稳定性。结果表明，在Nb₂O₅负载量6% (质量分数，下同)， 450 ℃焙烧4 h 的条件下，催化剂活性最高，环己烯转化率达到14.7%，环己醇选择性为99.7%。

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	李雅楠
	汪宝和
	朱璟

关键词： Nb/HZSM-5催化剂草酸铌氨环己烯水合环己醇

Abstract： A method of modify HZSM-5 by using niobium oxalate ammonium is introduced. We studied the surface acidity of Nb/HZSM-5 with different Nb content and the catalytic activity of cyclohexene hydration reaction. XRD and BET characterization results showed that: niobic acid had been highly dispersed, when Nb₂O₅ was added to HZSM-5 with suitable amount, the modified Nb/HZSM-5 showed a preservation of the zeolite structure; Py-TPD showed that the introduce of the niobium avoiding the dehydroxylation of zeolite which led acid reduction, and also increased the framework stability of zeolite catalyst. Loading with 6%(wt%)Nb₂O₅, calcined at 450 ℃ for 4 h got the highest catalytic activity, which the conversion of cyclohexene was 14.7% and the selectivity of cyclohexanol was 99.7%.

Keywords： Nb/HZSM-5 catalyst niobium oxalates ammonium cyclohexene hydration cyclohexanol

Received 2012-05-30;

Corresponding Authors: 汪宝和，电话:(022)27403763，E-mail:wangbh@tju.edu.cn。 Email: wangbh@tju.edu.cn

About author: 李雅楠(1988-)，女，硕士，从事环己烯水合催化剂的研究。

引用本文:

李雅楠, 汪宝和, 朱璟.铌改性HZSM-5分子筛催化环己烯水合反应研究[J]. 化学工业与工程, 2013,30(3): 33-37

LI Ya-Nan, WANG Bao-He, ZHU Jing.Catalytic Activity of Modified HZSM-5 on Hydration of Cyclohexene[J]. Chemcial Industry and Engineering, 2013,30(3): 33-37