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

Abstract

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

CLC Number:

TQ423

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

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

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