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/Al = 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/Al = 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 %.

中文翻译：

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的制备升高苯丙氨醇EE选择性通过的催化氢化升-苯丙氨酸盐在铜/氧化锌/铝₂ ö ₃催化剂

采用共沉淀法制备了L-苯丙氨酸加氢成L-苯丙氨酸的Cu / ZnO / Al ₂ O ₃催化剂，并通过XRD，低温N ₂吸附，H ₂ -TPR，N ₂ O化学吸附等方法表征。和ICP-AES。结果表明，催化剂的理化性质受ZnO量的影响很大，Cu / ZnO / Al ₂ O ₃催化剂（Cu / Zn / Al）的裸露铜表面积，CuO分散度和BET表面积= 1.0：0.3：1.0）达到最大值。在Cu / ZnO / Al中，L-苯丙氨醇的化学选择性随ZnO量的变化而变化。₂ O ₃催化剂，并且当Cu / Zn / Al ＝ 1.0∶0.3∶1.0时，该催化剂表现出较高的催化性能和对L-苯基丙氨醇的化学选择性。此外，研究了温度，压力，反应时间和催化剂与酯的摩尔比对L-苯丙氨酸酯催化加氢的影响。当L-苯丙氨酸的催化加氢反应在110℃和4 MPa的H _2下进行5 h时， L-苯丙氨酚的收率可达69.2％， ee选择性为99.84％。