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lanlan1987金虫 (正式写手)
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[求助]
英文翻译，关于催化方面
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摘要：本文采用醇盐-凝胶溶胶法制备Al2O3-ZrO2复合载体，并通过超声浸渍法制备Cs2O/ Al2O3-ZrO2催化剂。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱（EDS）等技术考察了复合载体对催化剂的晶相结构、表面形貌的影响；并以甲醛和醋酸甲酯合成丙烯酸甲酯反应为探针，讨论了单一载体及铝锆比不同的复合载体催化剂的催化活性。实验结果表明：经过500℃煅烧的催化剂具有良好的晶形；材料具有蜂窝状孔道，具有良好的通透性；Cs的负载量为4.42%；当mAl2O¬3：mZrO2=1:0.25时所得催化剂的活性最高，收率达到14.76%。 关键词：醇盐-凝胶溶胶法； Al2O3-ZrO2复合载体；羟酸缩合 |
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xiaohanhan2007 
捐助贵宾 (小有名气)
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sltmac(金币+1): 2011-11-28 17:15:01
lanlan1987(金币+50, 翻译EPI+1): 辛苦了 2011-11-28 18:17:23
sltmac(金币+1): 2011-11-28 17:15:01
lanlan1987(金币+50, 翻译EPI+1): 辛苦了 2011-11-28 18:17:23
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Abstract: Al2O3-ZrO2 composite carriers have been prepared by the alkoxide sol-gel method, and Cs2O / Al2O3-ZrO2 catalysts have been prepared utilizing ultrasonic impregnation. Besides, the effects of the carriers on the crystal phase structures and the morphologies of the catalysts have been investigated employing X-ray diffractions (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Moreover, the catalytic activity of the catalysts with single and composite carriers of various Al/Zr ratios was thoroughly discussed by means of the reaction of formaldehyde and methyl acetate affording methacrylate. The results show that the catalysts were of favorable crystal shapes after the calcinations at 500 ℃. Meanwhile, the cellular pores of the materials could lead to satisfactory permeability. Furthermore, the loading of Cs was 4.42%, and the catalyst activity reached maximum with the yield of 14.76% when the molar ratio of Al2O3 and ZrO2 was 1:0.25. Keywords: alkoxide sol-gel method, Al2O3-ZrO2 composite carrier, aldol condensation |
2楼2011-11-28 16:16:54