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《Journal of Molecular Catalysis》 2004-05
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Cyclohexane Hydroconversion on Pt/HY-Al_2O_3 Catalysts

LI Qing-hua, LIU Yun-qi, LIU Chun-ying, LIU Chen-guang a)  
Platinum catalysts supported on HY-Al_2O_3 have been prepared and characterized by TG-DTA. Isomerization and ring-opening mechanism of cyclohexane on these platinum catalysts have been investigated by performing hydrogenation of cyclohexane with a high pressure microreactor under the conditions of 260 ℃~350 ℃, 4.0MPa, WHSV1.0h~(-1), hydrogen flowed velocity 100 mL/min. Isomerization, ring-opening and cracking activity of cyclohexane on catalysts increased with increasing of catalyst acidity and reaction temperature. Isomerization selectivity of the catalyst with 15% zeolite is best under the condition of 290 ℃: conversion is 71.6%, selectivity of methylcyclopentane is 91.6%. Cyclohexane was isomerized into methylcyclopentane first , products of methylcyclopentane ring opening included n-hexane, 3-methylpentane and 2-methylpentane. Equilibrium mixture of ring opening products was nH∶3MP∶2MP=1∶1∶2. Ring-opening of methylcyclopentane complied with carbenium ions mechanism on these platinum catalysts.
【Fund】: 中国石油天然气集团公司中青年创新基金课题(03E7026).
【CateGory Index】: O643.32
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