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首页> 外文期刊>Catalysis science & technology >Effect of the TiO2 crystal structure on the activity of TiO2-supported platinum catalysts for ammonia synthesis via the NO-CO-H2O reaction
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Effect of the TiO2 crystal structure on the activity of TiO2-supported platinum catalysts for ammonia synthesis via the NO-CO-H2O reaction

机译：二氧化钛的晶体结构的影响TiO2-supported铂催化剂的活性通过NO-CO-H2O氨合成反应

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摘要

Selective formation of NH3, a potential hydrogen carrier for renewable energy applications, by means of the NO-CO-H2O reaction over TiO2-supported Pt catalysts was investigated as a way to recover NOx species emitted from combustion processes. All of the tested Pt/ TiO2 catalysts showed almost complete conversion of NO to NH3 at temperatures > 250 degrees C; but at temperatures < 200 degrees C, the activity of Pt supported on anatase TiO2 was higher than the activities of Pt on rutile TiO2 or a mixture of anatase and rutile TiO2. Transmission electron microscopy revealed that the Pt particle size on anatase TiO2 was smaller than that on rutile TiO2. Temperature-programed reduction by hydrogen revealed that Pt interacted with the anatase TiO2 support but not with the rutile TiO2 support. Diffuse reflectance infrared Fourier transform spectroscopy and measurements of kinetic parameters revealed that the CO adsorption behavior and the activity of hydrogen supply from H2O depended on the support. Specifically, Pt supported on anatase TiO2 retained the adsorbed CO at temperatures up to 200 degrees C, and the reaction orders with respect to CO and H2O were -0.06 and 0.39, respectively. In contrast, Pt supported on rutile TiO2 desorbed CO below 200 degrees C, and the reaction orders with respect to CO and H2O were -0.57 and 0.03, respectively. The difference of the catalytic activity at low temperature between Pt/ TiO2.A) and Pt/ TiO2.R) is due to the difference of the reactivity of CO and H2O.
机译：选择性NH3的形成,一个潜在的氢载体可再生能源应用,NO-CO-H2O反应的手段TiO2-supported Pt催化剂被调查方法恢复氮氧化物物种发出燃烧过程。催化剂显示几乎完全没有转换NH3在温度> 250摄氏度;温度< 200摄氏度,Pt的活动支持锐钛矿二氧化钛是高于Pt在金红石二氧化钛或活动的混合物锐钛矿和金红石二氧化钛。显微镜显示,工党粒度锐钛矿二氧化钛小于金红石二氧化钛。透露,Pt与锐钛矿二氧化钛支持与金红石二氧化钛但不支持。漫反射红外傅里叶变换光谱和动力学的测量参数显示CO吸附氢供应的行为和活动水依赖于支持。支持锐钛矿二氧化钛保留了吸附公司在温度高达200摄氏度,对公司和水反应订单分别为-0.06和0.39。支持金红石二氧化钛眠低于200度,反应订单与尊重公司和水分别为-0.57和0.03,分别。不同的催化活性低温度之间的Pt / TiO2.A)和Pt / TiO2.R)是由于不同公司的反应和H2O。

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