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首页> 外文期刊>Catalysis science & technology >Preparation of L-phenylalaninol with high ee selectivity by catalytic hydrogenation of L-phenylalaninate over Cu/ZnO/Al2O3 catalys
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Preparation of L-phenylalaninol with high ee selectivity by catalytic hydrogenation of L-phenylalaninate over Cu/ZnO/Al2O3 catalys

机译:通过在Cu/ZnO/AL2O3 Catalys上催化L-苯基甲酸的催化氢化,制备具有高EE选择性的L-苯基丙氨酸

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摘要

The Cu/ZnO/Al2O3 catalyst for hydrogenation of L-phenylalaninate to L-phenylalaninol was prepared by a co-precipitation method, and characterized by XRD, low-temperature N2 adsorption, H2-TPR, N2O chemisorption and ICP-AES. The results show that the physicochemical properties of the catalyst are greatly affected by the ZnO amount, and that the exposed copper surface area, dispersion of CuO and BET surface area of the Cu/ZnO/Al2O3 catalyst (Cu/Zn/AI = 1.0:0.3:1.0) reach the largest. The chemoselectivity of L-phenylalaninol is changed with ZnO amount in the Cu/ZnO/Al2O3 catalyst, and when Cu/Zn/AI = 1.0:0.3:1.0, the catalyst exhibits higher catalytic performance and chemoselectivity to L-phenylalaninol. Furthermore, the effect of temperature, pressure, reaction time and the molar ratio of catalyst to ester on the catalytic hydrogenation of L-phenylalaninate were investigated. When the catalytic hydrogenation of L-phenylalaninate was operated at 110 °C and 4 MPa of H2 for 5 h, the yield of L-phenylalaninol can reach 69.2 %, and its ee selectivity is 99.84 %.
机译:通过共沉淀法制备了l-苯基丙酰氨酸氢化为L-苯基丙氨酸的Cu/ZnO/Al2O3催化剂,并通过XRD进行了表征,低温N2吸附,H2-TPR,H2-TPR,N2O化学吸附和ICP-AES。结果表明,催化剂的物理化学特性受ZnO量极大的影响,并且暴露的铜表面积,CuO的分散和Cu/ZnO/Al2O3催化剂的BET表面积(Cu/Zn/ai = 1.0:0: 0.3:1.0)达到最大。 L-苯基丙氨酸的化学选择性用Cu/ZnO/Al2O3催化剂中的ZnO量更改,当Cu/Zn/Ai = 1.0:0.3:1.0时,催化剂表现出更高的催化性能和对L-苯基丙氨酸醇的化学选择性。此外,还研究了催化剂与酯的温度,压力,反应时间和摩尔比对L-苯基丙酯酸酯催化氢化的摩尔比。当在110°C和4 MPa的H2催化氢化液的催化氢化5小时时,L-苯基丙氨酸的产量可以达到69.2%,其EE选择性为99.84%。

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