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《Chinese Journal of Catalysis》 2005-09
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Selective Hydrogenation of Benzene to Cyclohexene in a Monolithic Reactor

ZHAO Duo 1,2, CHEN Guangwen 1*, YUAN Quan1 ( 1 Dalian Institute of Chemical Physics,The Chinese Academy of Sciences, Dalian 1 16023, Liaoning, China; 2 Graduate School of The Chinese Academy of Sciences, Beijing 100049 , China)  
An attractive field of industrial use of a monolithic reactor lies in multiphase catalytic reactions, especially hydrogenation and oxidation of hydrocarbons, du e to its superior interphase mass transfer performance. In this paper, liquid-p hase selective hydrogenation of benzene to cyclohexene over a Ru/ZrO2 honeyco mb monolithic catalyst was studied in detail. The effects of catalyst and reacti on variables, such as the support type, ruthenium content, catalyst pretreatmen t, addition of water or salt in reactants, reaction temperature, hydrogen press ure and volume ratio of water to benzene, on the performance of the reaction wer e investigated. Good yields of cyclohexene could be obtained using ruthenium par ticles supported on hydrophilic oxides, like silica, alumina, titania and zircon ia. It should be noted that the reaction can occur without catalyst prereduction in hydrogen flow in the monolithic reactor. No cyclohexene was detected in the absence of reaction additives such as water or ZnSO4 solution, but the select ivity for cyclohexene dramatically increased to higher than 20% when these react ion modifiers were added. There existed an optimum volume ratio of water to benz ene for high yield of cyclohexene. Better results were achieved in the presence of 0.1 mol/L ZnSO4 under the reaction temperatures of 413~443 K and pressure s of 3~4 MPa.
【Fund】: 国家自然科学基金(20176057 20490200);; 国际科技合作重点项目计划(2001CB711203);; 中国科学院大连化学物理研究所创新基金(K2003E2)资助项目.
【CateGory Index】: TQ231
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