L-alanine hydrogenation over RuPd bimetallic catalysts

doi:10.11949/j.issn.0438-1157.20171473

Abstract

Abstract:

Both yield and optical selectivity of L-alaninol were improved in liquid-phase hydrogenation of L-Alanine by adding Pd to Ru/C catalyst. The prepared catalysts were characterized by inductively coupled plasma mass spectrometry (ICP-MS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results showed that RuPd species were dispersed evenly as small particles on active carbon support and addition of Pd atoms significantly improved electronic properties of Ru. Controlling atomic ratio of Ru to Pd could change existence status of RuPd species and hence affect yield and optical selectivity of L-alaninol. In the condition of 0.9 mol·L^-1 L-Alanine, 0.69 mol·L^-1 phosphoric acid, 20% catalyst to reactant, 95℃ temperature, and 4.0 MPa pressure, the catalyst with 3:1 atomic ratio of Ru to Pd showed the best performance which both yield and optical selectivity of L-alaninol reached to 99.7%. The catalyst can be recycled and reused for 20 times with no change in catalytic performance.

Key words: catalyst, activated carbon, RuPd bimetallic, hydrogenation, L-alaninol

摘要：

通过添加金属Pd对Ru/C催化剂进行改性，提高了L-氨基丙酸加氢制备L-氨基丙醇的收率和光学选择性。采用ICP-MS、XRD、TEM和XPS对所制备的催化剂进行了系统的表征，结果表明：RuPd物种在载体活性炭上分散均匀粒径较小，Pd原子的加入可显著改善Ru的电子特性，调变不同的RuPd原子比，可影响RuPd物种的存在状态，进而影响L-氨基丙醇的收率和光学选择性。在氨基丙酸浓度为0.9 mol·L^-1，磷酸浓度0.69 mol·L^-1，催化剂用量为反应物的20%，反应温度95℃，压力4.0 MPa的反应条件下，RuPd原子比为3∶1时催化剂表现出最好的催化性能，L-氨基丙醇的收率达到99.7%，产品的光学选择性同样达到了99.7%，同时催化剂能循环使用20次，催化性能基本保持不变。

关键词: 催化剂, 活性炭, RuPd双金属, 加氢, L-氨基丙醇

CLC Number:

O643

TANG Weiwei, YAO Jianlong, XU Xiangsheng, YAN Xinhuan. L-alanine hydrogenation over RuPd bimetallic catalysts[J]. CIESC Journal, 2018, 69(6): 2503-2511.

汤伟伟, 姚健龙, 许响生, 严新焕. 钌钯双金属催化剂催化L-氨基丙酸加氢特性[J]. 化工学报, 2018, 69(6): 2503-2511.

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