贵金属催化p-叔丁基-α-甲基肉桂醛加氢

doi:10.11944/j.issn.1000-0518.2020.03.190192

摘要/Abstract

摘要：

采用傅里叶变换红外光谱仪(FT-IR)、N₂吸脱附、X射线衍射(XRD)、透射电子显微镜(TEM)揭示了微波辅助-KOH处理对活性炭的物理化学性能的影响规律。结果表明,活性炭表面的含氧基团的种类增加,微孔明显减少,中大孔的比例增大。通过浸渍-原位还原方法制备了Pt、Pd、Ru、Rh负载微波辅助-KOH处理活性炭催化剂,并对其催化p-叔丁基-α-甲基肉桂醛选择性加氢性能进行了研究。发现Pt具有优异的C=O加氢选择性,而Pd具有优良的C=C加氢选择性。进一步研究了Pd-Pt双组分催化剂催化p-叔丁基-α-甲基肉桂醛加氢产物分布,随着Pt含量的增加, C=O选择性逐步提高, C=C选择性逐渐下降,且当m(Pd)∶m(Pt)=4∶1时,其催化剂的催化性能最佳。

关键词: 微波辅助, 活性炭, 贵金属负载催化剂, 选择性加氢, p-叔丁基-α-甲基肉桂醛

Abstract:

In this paper, Fourier transform infrared spectroscopy (FT-IR), N₂ adsorption-desorption, X-ray diffraction (XRD )andtransmission electron microscopy (TEM) were used to characterize the activated carbon treated via microwave with KOH. The results show that the oxygen-containing groups on the surface of activated carbon increase greatly, and the number of micropores decrease significantly. The selective catalytic hydrogenation performances of p-tert-butyl-α-methyl cinnamaldehyde over Pt, Pd, Ru and Rh supported on activated carbon were investigated. The Pt/C catalyst shows excellent selective hydrogenation for C=O, while the Pd/C catalyst has good selectivity for hydrogenation of C=C. The product distribution of selective hydrogenation of p-tert-butyl-α-methylcinnamaldehyde catalyzed by Pd-Pt bimetallic catalyst was also studied. The results show that the selective hydrogenation of C=O is gradually increased with an increase of Pt content, while the selectivity of hydrogenation of C=C decreases gradually over the Pd-Pt bimetallic catalyst. An optimal catalytic performance is obtained over Pd-Pt bimetallic catalyst when m(Pd)∶m(Pt)=4∶1.

Key words: microwave-assisted, activated carbon, noble metal supported catalyst, selective hydrogenation, p-tert-butyl-α-methylcinnamaldehyde

曾利辉,李岳锋,延浩翔,曾永康,张之翔,刘忠文,刘昭铁. 贵金属催化p-叔丁基-α-甲基肉桂醛加氢[J]. 应用化学, 2020, 37(3): 322-331.

Lihui ZENG,Yuefeng LI,Haoxiang YAN,Yongkang ZENG,Zhixiang ZHANG,Zhongwen LIU,Zhaotie LIU. Catalytic Hydrogenation Performance of p-tert-Butyl-α-Methyl Cinnamaldehydeover Precious Metal Catalysts[J]. Chinese Journal of Applied Chemistry, 2020, 37(3): 322-331.

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