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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Methanation of CO2 over alkali-promoted Ru/TiO2 catalysts: I. Effect of alkali additives on catalytic activity and selectivity
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Methanation of CO2 over alkali-promoted Ru/TiO2 catalysts: I. Effect of alkali additives on catalytic activity and selectivity

机译：CO 2甲烷化在碱促进的Ru / TiO2催化剂上：I.碱添加剂对催化活性和选择性的影响

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摘要

The effect of alkali promotion of TiO2 on the CO2 hydrogenation activity and selectivity has been investigated over 0.5%Ru/TiO2 and 5%Ru/TiO2 catalysts of different promoter type (Li, Na, K, Cs) and variable promoter loading (0.0-0.40 wt.%). The effect of alkali promotion was found to be more pronounced over catalysts of low Ru loading (or small Ru crystallites). In the case of 0.5%Ru/TiO2 catalysts, both catalytic activity and methane selectivity are strongly enhanced with the addition of small amounts (0.2 wt.%) of alkalis following the order of TiO2 (unpromoted) Li similar to K Cs Na. The intrinsic reaction rate exhibits a volcano-type dependence on the sodium content. Optimal results were obtained for 0.5%Ru/TiO2 catalyst containing 0.2 wt.% Na, the specific activity of which is about 3 times higher, compared to that of the unpromoted sample. In the case of 5%Ru/TiO2 catalysts, alkali addition does not practically affect catalytic activity and selectivity. Turnover frequency of 0.5%Ru/0.2%Na-TiO2 catalyst is higher than that measured over 5%Ru/TiO2, indicating that small amounts of alkalis can replace part of precious metals, reducing the cost and increasing the efficiency of the CO2 methanation process.
机译：在不同启动子型（Li，Na，K，Cs）和可变启动子负载（0.0- 0.40重量％）。发现碱促进的效果在低ru载荷（或小ru微晶）的催化剂上更加明显。在0.5％Ru / TiO 2催化剂的情况下，通过在TiO 2（非突出的）＆ LI类似于K＆ CS＆ na。内在反应速率表现出对钠含量的火山型。获得含有0.2重量％Na的0.5％Ru / TiO 2催化剂的最佳结果，与未赋予的样品相比，其特异性活性为约3倍。在5％Ru / TiO 2催化剂的情况下，碱添加实际上不会影响催化活性和选择性。 0.5％Ru / 0.2％Na-TiO2催化剂的周转频率高于5％Ru / TiO 2的催化剂，表明少量碱可以代替一部分贵金属，降低成本并提高CO 2甲烷化过程的效率。

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