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首页> 外文期刊>Reaction kinetics,mechanisms and catalysis >Catalytic hydrogenation of benzaldehydes over platinum nanoparticles immobilized on magnesium aluminate spinel under mild conditions
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Catalytic hydrogenation of benzaldehydes over platinum nanoparticles immobilized on magnesium aluminate spinel under mild conditions

机译：在温和条件下固定在铝酸镁尖晶石上的铂纳米粒子催化苯甲醛的加氢反应

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摘要

Platinum nanoparticles, synthesized via ethanol reduction of hexachlo-roplatinic acid in the presence of poly-(N-vinyl-2-pyrrolidone), were anchored on magnesium aluminate spinel using a colloidal deposition method. The samples were characterized using the following methods: transmission electron microscopy, powder X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The results revealed that platinum nanoparticles, with an average diameter of 2.8 nm, are homogenously dispersed on the surface of the carrier. Under very mild conditions, supported Pt/MgAl2O4 catalysts demonstrated excellent catalytic activity and high selectivity in the hydrogenation reaction of benzaldehydes to benzyl alcohols. The reaction kinetics for the catalytic hydrogenation of 3-phenoxybenzaldehyde to 3-phenoxybenzyl alcohol on a Pt/MgAl2O4 catalyst can be described by equation r = k x c~(1.44)x pH2, and the apparent activation energy is 35.6 kJ mol~(-1).
机译：在聚-（N-乙烯基-2-吡咯烷酮）存在下，通过乙醇还原六氯罗铂酸合成的铂纳米粒子，通过胶体沉积法固定在铝酸镁尖晶石上。使用以下方法对样品进行表征：透射电子显微镜，粉末X射线衍射，扫描电子显微镜和能量色散X射线光谱。结果表明，平均直径为2.8nm的铂纳米颗粒均匀地分散在载体的表面上。在非常温和的条件下，负载的Pt / MgAl2O4催化剂在苯甲醛加氢制苄醇中表现出出色的催化活性和高选择性。在Pt / MgAl2O4催化剂上将3-苯氧基苯甲醛催化加氢成3-苯氧基苄醇的反应动力学方程可表示为r = kxc〜（1.44）x pH2，表观活化能为35.6 kJ mol〜（-1 ）。

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