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首页> 外文期刊>The European physical journal, D. Atomic, molecular, and optical physics >Efficiency of Pd impregnated sol-gel derived γ-alumina porous spheres as catalyst
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Efficiency of Pd impregnated sol-gel derived γ-alumina porous spheres as catalyst

机译：钯浸渍溶胶-凝胶衍生的γ-氧化铝多孔球作为催化剂的效率

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摘要

Porous γ-alumina spheres having surface area as large as 300 m~2/gm are obtained by using sol-gel process. γ-alumina supported Pd catalyst is synthesized by soaking it in PdCl_2 solution followed by drying and heating at 300 ℃/1 hr in hydrogen atmosphere. Specific Surface Area of Pd coated alumina remained unaltered. The scanning electron microscopy revealed uniform coating of Pd metal on the surface. The equivalent spherical diameter (ESD) of the coated Pd metal particles is estimated to be 50. The catalytic efficiency is evaluated by H_2-O_2 combination reaction. The performance of this supported catalyst is found to be much superior in comparison with Pd catalyst realized on commercially available alumina having surface area of 80 m~2/gm. The improved efficiency of the catalyst could be co-related to enhanced surface of nano-structured Pd available for catalytic action. The added advantage of spherical shape of the support material appeared in uniform and homogeneous loading of the catalyst bed. The results highlight the important role played by support material in these type of catalysts.
机译：采用溶胶-凝胶法制得了表面积为300 m〜2 / gm的多孔γ-氧化铝球。将γ-氧化铝负载的Pd催化剂浸泡在PdCl_2溶液中，然后在氢气氛围中干燥并在300℃/ 1 hr加热，即可合成。涂钯的氧化铝的比表面积保持不变。扫描电子显微镜显示在表面上钯金属的均匀涂层。涂覆的Pd金属颗粒的当量球形直径（ESD）估计为50。通过H_2-O_2组合反应评价催化效率。与在表面积为80m 2 / g的市售氧化铝上实现的Pd催化剂相比，发现该载体催化剂的性能要优越得多。催化剂效率的提高可能与可用于催化作用的纳米结构钯表面的增强有关。载体材料的球形的附加优点表现在催化剂床的均匀和均质负载中。结果突出了载体材料在这类催化剂中所起的重要作用。

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