Bimetallic Au–Pd/MgO as efficient catalysts for aerobic oxidation of benzyl alcohol: A green bio-reducing preparation method
Bimetallic Au–Pd/MgO as efficient catalysts for aerobic oxidation of benzyl alcohol: A green bio-reducing preparation method
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DOI：
10.1016/j.apcata.2012.07.005
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发表时间：
2012-10
影响因子：
5.5
通讯作者：
Guowu Zhan;Yingling Hong;V. Mbah;Jiale Huang;Abdul-Rauf Ibrahim;Mingming Du;Qingbiao Li
中科院分区：
文献类型：
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作者：
Guowu Zhan;Yingling Hong;V. Mbah;Jiale Huang;Abdul-Rauf Ibrahim;Mingming Du;Qingbiao Li
以Au-Pd/MgO-Pd催化剂为催化剂，考察了制备方法、Au/Pd摩尔比、焙烧温度和反应温度、氧气流量等条件对苯甲醇氧化反应转化率和选择性的影响。通过两种新的还原方法与生物还原剂制备的Pd/Au催化剂，并通过透射电子显微镜，X-射线衍射，漫反射紫外-可见光谱，热重分析，以了解协同Au和Pd之间的相互作用。在最佳条件下，Au-Pd双金属催化剂（摩尔比为1：1，粒径为9.7±1.3nm）的催化活性和选择性分别比单金属催化剂提高了52%和100%。此外，催化剂在6次循环后仍保持活性，无团聚现象。
The oxidation of benzyl alcohol, with molecular oxygen at atmospheric pressure in an aqueous medium, is investigated using Au–Pd/MgO bimetallic catalysts to examine the effect of catalyst parameters (viz. preparation method, Au/Pd molar ratio, and calcinations temperature) and reaction conditions (viz. reaction temperature and oxygen flow rate) on conversion and selectivity. The bimetallic catalysts were prepared via two novel reduction methods with bio-reducing agents and were characterized by transmission electron microscopy, X-ray diffraction, diffuse reflectance UV–vis spectroscopy, and thermogravimetric analysis to understand synergistic interactions between Au and Pd. Under optimal conditions, the Au–Pd bimetallic catalysts, with a 1:1 molar ratio and 9.7±1.3nm particle size, exhibited remarkably enhanced catalytic activity (>52%) and selectivity (∼100%) compared with their monometallic counterparts. Moreover, the activity of the catalysts was maintained after six recycles without agglomeration.