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首页> 外文期刊>Catalysis science & technology >Great improvement on the selective hydrogenation of crotonaldehyde over CrOx- and FeOx-promoted Ir/SiO2 catalysts
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Great improvement on the selective hydrogenation of crotonaldehyde over CrOx- and FeOx-promoted Ir/SiO2 catalysts

机译：巨大的改善选择性加氢巴豆醛的鞋,FeOx-promoted戈登/ SiO2 catalysts

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摘要

Catalytic selective hydrogenation of alpha,beta-unsaturated aldehydes to alpha,beta-unsaturated alcohols is very important in the synthesis of various fine chemicals. However, the development of highly efficient catalyst systems is challenging because of the low selectivity and severe deactivation of the currently employed catalysts such as Pt and Au. In this work, a series of CrOx- and FeOx-promoted Ir/SiO2 catalysts were prepared by a sequential impregnation method and tested for gas phase selective hydrogenation of crotonaldehyde. It was found that the addition of promoters could greatly enhance the catalytic performance. The Ir/SiO2 catalyst promoted with combined CrOx-FeOx with a (Cr + Fe)/Ir ratio of 0.05 showed the highest steady state crotyl alcohol yield of 64.5% at a selectivity of 86%, which is 4-fold higher than that of the unpromoted Ir/SiO2 (15.5%) catalyst. Such an enhancement was due to the formation of new active sites generated at the Ir-CrOx and/or Ir-FeOx interfaces. Also, catalysts with low loadings of promoters showed excellent stability due to their appropriate electronic properties, while the catalyst with a high loading of promoters deactivated quickly due to the strong adsorption of products on the surface.
机译：催化的选择性加氢α,beta-unsaturated醛α,beta-unsaturated醇是非常重要的在各种精细化学品的合成。然而,高效的发展催化剂系统是具有挑战性的,因为低选择性和严重的失活目前使用Pt和非盟等催化剂。在这个工作中,一系列的鞋,FeOx-promoted红外/二氧化硅催化剂是由顺序浸渍法和检测气相巴豆醛选择性加氢。发现的推动者大大提高催化性能。红外/二氧化硅催化剂提升CrOx-FeOx相结合(Cr + Fe) /红外比0.05显示稳态巴豆醇产量最高64.5%的选择性86%,4倍高于unpromoted Ir /二氧化矽(15.5%)催化剂。新活动网站生成的形成Ir-CrOx和/或Ir-FeOx接口。启动子显示载荷较低的催化剂由于他们合适优秀的稳定电子性质,而与催化剂高负载的启动子迅速释放产品强大的吸附能力表面。

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