Selective Ring Opening of Methylcyclopentane and Methylcyclohexane Over Iridium Bifunctional Catalysts Supported on Surface Modified γ-Al2O3, SiO2 and Ultra Stable Y Zeolites
Selective Ring Opening of Methylcyclopentane and Methylcyclohexane Over Iridium Bifunctional Catalysts Supported on Surface Modified γ-Al2O3, SiO2 and Ultra Stable Y Zeolites
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表面改性 γ-Al2O3、SiO2 和超稳定 Y 沸石负载铱双功能催化剂上甲基环戊烷和甲基环己烷的选择性开环
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
C. Lee
中科院分区：
文献类型：
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作者：
R. Nageswara Rao;Nansuk You;Songhun Yoon;Dipali P. Upare;Yong;C. Lee
研究了γ-Al_2O_3、SiO_2和超稳Y沸石负载的Ir催化剂上甲基环戊烷和甲基环己烷的选择性开环反应。通过共浸渍少量的钾来改变载体的酸密度，考察了其对转化率、产率和选择性的影响。USY沸石对MCP和MCH的转化率分别为26.9-38.1%和27.5-33.7%，开环选择性分别为56.4-63.8%和94.3-97.7%。在硅胶上的转化率为10.7-16.6%和10.4-14.0%，选择性为96.9-99.0%和93.3-99.1%。有趣的是，在γ-Al_2O_3和SiO_2上负载Ir的催化剂中，钾起到了促进剂的作用，而对Ir的活性有抑制作用。对反应温度、压力、接触时间、料液比等条件进行了优化。考察了γ-Al_2O_3、SiO_2和USY分子筛表面共浸钾改性后的催化剂对甲基环戊烷和甲基环己烷选择性开环反应的影响，并考察了它们的选择性开环反应。
Selective ring opening of methylcyclopentane (MCP) and methylcyclohexane (MCH) over a series of Iridium catalysts supported on γ-alumina, silica and ultra-stable Y (USY) zeolites was investigated. The acid density of the supports was modified by co impregnation of potassium in small quantities and its effect on conversion, yield and selectivity was evaluated. USY zeolites showed 26.9–38.1 and 27.5–33.7% of conversion with ring opening selectivities between 56.4–63.8 and 94.3–97.7% for MCP and MCH, respectively. Whereas on silica, the conversions were 10.7–16.6 and 10.4–14.0% with 96.9–99.0 and 93.3–99.1% selectivity. Interestingly, potassium acted as a promoter in case of USY zeolites while suppressed of activity of Ir supported on γ-alumina and silica. The reaction conditions such as temperature, pressure, contact time and the feed/catalyst ratio were optimized. The evaluation of catalysts’ activity and selectivity towards ring opening of MCP and MCH is of great importance in understanding which catalyst modification could be effective in treatment of gasoline/diesel feed stocks for improving octane/cetane rating and fuel quality.Graphical AbstractSelective ring opening of methylcyclopentane and methylcyclohexane over a series of Iridium catalysts supported on surface modified by co impregnation of potassium of γ-alumina, silica and USY zeolites was investigated and its effect on conversion, yield and selectivity was evaluated.