Novel supported Pd hydrogenation bionanocatalyst for hybrid homogeneous/heterogeneous catalysis
Novel supported Pd hydrogenation bionanocatalyst for hybrid homogeneous/heterogeneous catalysis
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DOI：
10.1016/j.cattod.2007.04.014
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发表时间：
2007-10-15
期刊：
影响因子：
5.3
通讯作者：
Macaskie, L. E.
中科院分区：
文献类型：
--
作者：
Creamer, N. J.;Mikheenko, I. P.;Macaskie, L. E.
均相和多相催化加氢方法各有优缺点，人们寻求混合方法来最大限度地发挥两者的优势。细菌细胞的长度为1-2LIM，是传统微型载体(如石墨和氧化铝)的经济替代品。某些细菌菌株可以从原料溶液或废催化剂的酸性提取物中还原可溶性Pd(II)，形成纳米Pd晶体，这些纳米晶体被支撑在细菌细胞表面层中。通过磁性测量(SQUID)和EXAFS光谱分析，生物支持的纳米Pd含有尺寸类似于5 nm或更小的颗粒。以革兰氏阴性和革兰氏阳性菌为载体的生物纳米钯催化衣康酸加氢反应的初始速率分别为1.1和1.2×10(-2)molGpd(-1)S(-1)，而市售5%Pd-石墨(1.3×10(-2)molGpd(-1)S(-1))的催化效果较好。(C)2007 Elsevier B.V.保留所有权利。
Homogeneous and heterogeneous catalysis approaches to hydrogenation have different advantages and disadvantages and hybrid approaches are sought to maximise the advantages of both. Bacterial cells, of length 1-2 lim, present an economical alternative to conventional micro-scale supports such as graphite and alumina. Certain strains of bacteria can reduce soluble Pd(II), from stock solutions or acid extracts of spent catalysts, forming nanocrystals of Pd, which are supported within the bacterial cell surface layers. The biologically supported nano-Pd contains particles of size similar to 5 nm and below, as determined using magnetic measurements (SQUID) and EXAFS spectroscopy. Bio-nano-Pd supported on exemplar Gram negative and Gram positive bacterial types catalysed the hydrogenation of itaconic acid (initial rates 1.1 and 1.2 x 10(-2) mol gPd(-1) s(-1)) comparing well with commercial 5% Pd-graphite (1.3 x 10(-2) Mol gPd(-1) s(-1)). (C) 2007 Elsevier B.V. All rights reserved.