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CuOx/CeO2 catalysts were prepared by adsorption-impregnation method, CO conversion was tested over the catalysts pretreated under different conditions for preferential CO oxidation in H2, and the catalysts were characterized with X-ray photoelectron spectroscopy and temperature programmed reduction. Experimental results show that there are two kinds of copper, which are Cu^+ and Cu^2+ in calcined CuOx/CeO2, Among them, the Cu^+ is the key active component for CO oxidation. The main reason is as follows: CO is activated by copper for CO oxidation over CuOx/CeO2, while CO can not be activated by Cu^2+. Only when Cu^2+ is reduced to Cu ^+ or Cu^0, the copper may be active for CO oxidation, moreover, the experimental results show that the reduction of Cu^2+ does not lead to an increase of catalytic activity. So the active species is Cu^+ in CuOx/CeO2 catalysts. 相似文献
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采用表面活性剂模板法制得一系列不同负载量的逆负载型CeO2/CuO催化剂。运用扫描电镜(SEM)、X射线粉末衍射(XRD)、程序升温还原(TPR)、透射电镜(TEM)、低温N2吸附-脱附等手段对催化样品进行了表征,并在35~195℃测定了催化剂在富H2中催化CO优先氧化(CO-PROX)的反应性能,考察了CeO2负载量、尺寸效应、界面效应对CO-PROX反应性能的影响,并对其CO优先氧化机理进行了探讨。研究表明,不同的CeO2负载量影响催化剂的比表面积和孔径分布,进而在催化剂上产生尺寸效应和界面效应,从而对催化剂的活性产生影响。 相似文献
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Fuel cells are considered to be the propulsionsystem of the near future,since they can produceelectricity without pollutingthe environment,and pos-sess the necessary specific power,power density anddurability to replace conventional internal combustioneng… 相似文献
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面对温室效应带来的生态灾难,利用各种技术封存固定CO2成为了关键,CO2矿物封存是其中最环保、最安全、最永恒的CO2固定方式。本文从封存方案、反应机理及碳化原料三方面详细介绍了CO2矿物封存技术的基本原理,并全面概述了CO2矿物封存的技术路线,其中包括直接碳化路线以及以酸浸出工艺、熔盐碳化工艺、铵盐浸出工艺以及生物浸出工艺为代表的间接碳化路线。同时结合国内外研究进展分析了各种CO2矿物封存技术的优缺点及其产业化前景,并提出今后我国CO2矿物封存技术研究和发展应更加注重从资源综合利用的角度考虑,将CO2看做是廉价碳资源材料,积极推进碳捕获、利用与封存项目的实施。 相似文献
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This work described in situ combustion synthesis method for depositing CuO-CeO2 on the FeCrAl honeycomb supports.The in-fluence of the solution concentration and the role of the additive were studied and analyzed by scanning electron microscopy (SEM),X-ray diffractometer (XRD),and temperature programmed reduction (TPR) techniques.The results showed that 200 g/L of the active solution was the most appropriate concentration for preparing the monolithic catalysts,and the additives of praseodymium and lanthanum... 相似文献
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