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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • selective gas phase hydrogenation of maleic anhydride over ni-supported catalysts: effect of support on the catalytic performance

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1209
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     the gas phase hydrogenation of maleic anhydride to obtain γ-butyrolactone was studied using ni supported on sio2, sio2–al2o3 and zeolite h-bea as catalysts. the samples were prepared by incipient wetness impregnation and characterized by n2 adsorption at −196 °c (sg), x-ray diffraction (xrd), temperature programmed reduction (tpr), temperature programmed desorption of nh3 (tpd-nh3) and chemisorption of h2. the reaction was carried out at 170 °c and 220 °c in a fixed bed reactor operating at atmospheric pressure. from the characterization results, it was determined that the degree of ni2+–support interaction varies according to the following pattern: ni/hbea > ni/sio2–al2o3 > ni/sio2. all catalysts were very active in the hydrogenation of maleic anhydride to succinic anhydride. however, hydrogenolytic activity and stability of nickel-based catalyst varies with the degree of interaction ni2+–support. ni/h-bea, in which ni2+–support interaction is the highest, was active in the hydrogenolysis of succinic anhydride to γ-butyrolactone but it was not stable. by contrast, ni/sio2–al2o3 and ni/sio2, with medium or low degree of ni2+–support interaction, were more stable than ni/h-bea. in addition, ni/sio2–al2o3, with a medium degree of ni2+–support interaction, was the most stable and selective to γ-butyrolactone, especially when the reaction was carried out at 220 °c.

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