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日用化学工业:2018,Vol.>>Issue(10):564-570
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十二烷基三乙氧基硅烷改性H3PW12O40/MCM-41在蓖麻油脱水反应中催化性能研究
丁建飞,严翠霞,许伟,邵荣
(盐城工学院 化学化工学院,江苏 盐城 224051)
Research on the catalytic performance of dodecyltriethoxysilane-modified H3PW12O40/MCM-41 in the dehydration of castor oil
DING Jian-fei,YAN Cui-xia,XU Wei,SHAO Rong
(School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu 224051, China)
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投稿时间:2018-08-07    
中文摘要: 采用十二烷基三乙氧基硅烷(DTES)改性H3PW12O40/MCM-41催化剂,研究了硅氧烷偶联剂改性对催化剂上蓖麻油脱水制备脱水蓖麻油反应性能的影响。结果表明,硅氧烷偶联剂改性有利于显著提高催化剂上H3PW12O40物相的分散度,主要原因是由于硅氧烷偶联剂增加了相邻H3PW12O40分子的空间位阻;分散度的提高导致了催化剂上总酸量以及Brønsted酸占总酸量的比值显著增加,且酸强度减弱,从而有利于蓖麻油转化率、脱水蓖麻油选择性和催化剂稳定性的提高。在220 ℃,H3PW12O40和DTES最佳负载量分别为15%和9%的条件下反应1.5 h,羟值、碘值分别达到8.3 mg KOH/g和149.3 g I2/100 g。
Abstract:The H3PW12O40/MCM-41 catalyst was modified by dodecyltriethoxysilane (DTES). The effects of DTES-modification on the catalytic performance of the catalyst in the dehydration of castor oil were studied. The results show that the modification with DTES can significantly improve the dispersity of H3PW12O40 on MCM-41, because the steric hindrance is increased between adjacent H3PW12O40 moleculars. The improved dispersity of H3PW12O40 results in the increase of total acidity and the ratio of Brønsted/(Brønsted+Lewis) acids, and the weaking of the acid strength, which facilitates the conversion of castor oil, the selectivity to dehydrated castor oil, and the catalytic stability. Given the optimized loadings of H3PW12O40 (15%) and DTES (9%), the hydroxyl and iodine values thus obtained are 8.3 mg KOH/g and 149.3 g I2/100 g, respectively, after the reaction at 220 ℃ for 1.5 h.
文章编号:     中图分类号:TQ423    文献标志码:
基金项目:国家自然科学基金资助项目(21303154) 国家自然科学基金资助项目(21303154)
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