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مجله مهندسی شیمی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • effect of alcohols as additives on the performance of a nano-sized ru–zn(2.8%) catalyst for selective hydrogenation of benzene to cyclohexene

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
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     in liquid phase hydrogenation of benzene, ru–zn(2.8%) catalyst (ru–zn catalyst with the zn mass percentage of 2.8%) exhibited the excellent selectivity to cyclohexene for the nano-size effect and the chemisorbed znso4·3(znoh)2⋅7h2o salt formed by the promoter zno reacting with znso4. it is found that the cyclohexene yield of ru–zn(2.8%) catalyst generally increased with the molecular weight of peg (polyethylene glycol) in the presence of znso4. peg-10000 (polyethylene glycol with the molecular weight of 10,000) as an additive made ru–zn(2.8%) catalyst give the highest cyclohexene yield of 62.3% in presence of znso4 for the following two reasons. firstly, the addition of peg-10000 in presence of znso4 could make more zn2+ chemisorbed on the surface of the catalyst. the zn2+ ions chemisorbed could be beneficial for stabilizing the formed cyclohexene, accelerating the desorption and hindering the re-adsorption of cyclohexene on the surface of the catalyst. secondly, the peg-10000 added might form two molecular hydrogen bonds in eight-numbered rings with the cyclohexene in the liquid phase, which could stabilize the cyclohexene in the liquid phase and hinder the re-adsorption. 2 g of this catalyst with 0.2 g peg-10000 as an additive pretreated in presence of znso4 gave a selectivity to cyclohexene of 78.6% and the best cyclohexene yield of 64.5% at the benzene conversion of 82.0% at 15 min. moreover, this catalyst had an excellent stability since zro2 and peg-10000 could effectively inhibit the agglomeration of ru–zn(2.8%) catalyst.

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