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

doi:10.13218/j.cnki.csdc.2018.10.004

摘要/Abstract

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Brnsted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。

关键词: 十二烷基三乙氧基硅烷, 改性, 蓖麻油, 催化脱水

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 Brnsted/(Brnsted+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.

Key words: dodecyltriethoxysilane, modification, castor oil, catalytic dehydration

中图分类号:

TQ423

丁建飞,严翠霞,许伟,邵荣. 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[J]. 日用化学工业, 2018, 48(10): 564-570.

DING Jian-fei,YAN Cui-xia,XU Wei,SHAO Rong. Research on the catalytic performance of dodecyltriethoxysilane-modified H₃PW₁₂O₄₀/MCM-41 in the dehydration of castor oil[J]. China Surfactant Detergent & Cosmetics, 2018, 48(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

Research on the catalytic performance of dodecyltriethoxysilane-modified H₃PW₁₂O₄₀/MCM-41 in the dehydration of castor oil

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