氧化石墨烯掺杂锌铝类水滑石负载钯金催化剂的制备及催化性能

发布时间：2018-01-16 01:23

  本文关键词：氧化石墨烯掺杂锌铝类水滑石负载钯金催化剂的制备及催化性能　出处：《化工进展》2017年11期 　论文类型：期刊论文

  更多相关文章： 醇 氧化 纳米粒子 水滑石 氧化石墨烯

【摘要】：采用离子交换-还原法制备了氧化石墨烯(GO)掺杂锌铝类水滑石负载钯金双金属纳米颗粒的催化剂(Pd Au/Zn-Al LDHs/GO),通过XRD、TEM表征了催化剂的结构,以GO掺杂锌铝类水滑石为载体负载钯金纳米颗粒粒径小(约2nm)且分散均匀。以苯甲醇空气氧化形成苯甲醛的反应为模型,评价催化剂的催化性能,探讨了载体及钯、金比例对催化反应的影响。催化结果表明,氧化石墨烯掺杂的锌铝类水滑石是考察载体中最好的钯、金催化剂的载体,随着钯金比的增加催化剂的催化活性先增加后降低,生成苯甲醛的选择性下降,当钯金比例为1∶1时,催化剂(Pd1Au1/Zn-Al LDHs/GO)的综合催化性能最好,催化活性随反应温度的升高而升高,但选择性随温度的升高而下降。在Pd1Au1/Zn-Al LDHs/GO催化下,80℃反应8h后苯甲醇的转化率可达96%,苯甲醛的选择性为93%,催化剂循环使用4次后仍保持较好的催化性能。
[Abstract]:The catalyst PD Au/Zn-Al LDHs / GOG doped with zinc-aluminum hydrotalcite-supported palladium and gold bimetallic nanoparticles was prepared by ion exchange reduction method. The structure of the catalyst was characterized by XRD- TEM. The particle size of palladium and gold nanoparticles supported on go doped zinc-aluminum hydrotalcite was small (about 2 nm) and dispersed uniformly. The catalytic performance of the catalyst was evaluated by air oxidation of benzyl alcohol to benzaldehyde. The effect of the support and the ratio of palladium and gold on the catalytic reaction was discussed. The results showed that the Zn-Al hydrotalcite doped with graphene oxide was the best support for palladium and gold catalysts. With the increase of the ratio of palladium to gold, the catalytic activity of the catalyst first increased and then decreased, and the selectivity of benzaldehyde decreased, when the ratio of palladium and gold was 1: 1. The catalytic activity of Pd1Au1 / Zn-Al LDHs / GOG is the best, and the catalytic activity increases with the increase of reaction temperature. However, the selectivity decreased with the increase of temperature, and the conversion of benzyl alcohol reached 96% after 8 h reaction at 80 鈩，

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