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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Selective Catalytic Reduction of NO by Methane over Pd Loaded on Heteropolyacids/SiO_2 at Low Temperature
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Selective Catalytic Reduction of NO by Methane over Pd Loaded on Heteropolyacids/SiO_2 at Low Temperature

机译：低温负载杂多酸/ SiO_2负载的Pd上甲烷选择性催化还原NO

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摘要

Pd was loaded on heteropolyacids/SiO_2,and used for the selective reduction of NO with methane in the presence of oxygen and moisture.The catalyst exhibited activity in the selective reduction of NO in the temperature range between 473 and 573 K.The temperature was significantly lower than that in the conventional catalysts,such as Pd-loaded zeolites or monolayer-type oxides.Among tested heteropolyacids,H_3PW_(12)O_(40)gave rise to the highest activity in the reaction.The catalytic performance was improved by the addition of water vapor.The generation of highly dispersed PdO species was observed in the Pd K-edge EXAFS spectra,whose structure was similar to those found in the conventional Pd-loaded zeolites catalyst.The reason for the evolution of NO reduction activity over Pd/H_3PW_(12)O_(40)/SiO_2 was attributed to the formation of NOH~+,as measured by IR,in addition to the generation of highly dispersed PdO species at low temperature on the Br0nsted acid sites of heteropolyacid.
机译：将Pd负载在杂多酸/ SiO_2上，在氧气和湿气存在下用甲烷选择性还原NO。该催化剂在473-573 K的温度范围内表现出选择性还原NO的活性。在负载杂多酸中，H_3PW_（12）O_（40）在反应中具有最高的活性。在Pd K-edge EXAFS光谱中观察到了高度分散的PdO物种的产生，其结构与传统的载Pd沸石催化剂中的结构相似.NO还原活性随Pd / H_3PW_（12）O_（40）/ SiO_2归因于NOH〜+的形成，这是通过IR测得的，除了在低温下在杂多酸的布朗斯台德酸位上产生了高度分散的PdO物种之外。

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