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首页> 外文期刊>Catalysis science & technology >Synthetic natural gas by direct CO2 hydrogenation on activated takovites: effect of Ni/Al molar ratio
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Synthetic natural gas by direct CO2 hydrogenation on activated takovites: effect of Ni/Al molar ratio

机译：通过直接二氧化碳加氢合成天然气在激活takovites:镍/铝摩尔的效果比

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摘要

Takovite-derived mixed oxides in Ni/Al molar ratios from 1 to 3 have been used as catalysts in hydrogenation of CO2 to CH4. The catalysts were characterized by XRD, BET, TEM, TGA, and H-2-TPR, and monitored by in situ DRIFTS under reaction conditions. The catalytic performance for the CO2 methanation has been investigated in a fixed-bed reactor at the temperature range from 225 to 400 degrees C and pressures of 10.0 and 1.0 bar(g). Takovite decomposition leads to the formation of a NiO phase containing Al ions and a nickel-containing alumina phase (Ni-deficient spinel). The percentage of spinel increases upon decreasing the Ni/Al ratio, and consequently, a lower amount of metallic nickel after subsequent reduction is achieved. All catalysts were partially reduced upon time on stream, leading to the formation of small Ni-0 crystallites (ca. 3 nm) dispersed on a NiAl2O4 matrix. The most active and selective catalyst was the one with a Ni/Al ratio of 2, which was also very stable after a 500 h lifetime test at atmospheric pressure and 275 degrees C.
机译：Takovite-derived混合氧化物在镍/铝摩尔比例从1到3被用作催化剂二氧化碳加氢甲烷。XRD、打赌、TEM、TGA和H-2-TPR,和监测原位飘下的反应条件。在固定床甲烷化被调查反应堆温度范围从225年到400年度和压力的10.0和1.0条(g)。Takovite分解导致的形成一个包含铝离子和NiO阶段(Ni-deficient nickel-containing氧化铝阶段尖晶石)。减少镍/铝比,因此,随后后较低的金属镍减少。部分在时间流减少,导致小的形成Ni-0微晶(ca。3海里)分散在NiAl2O4矩阵。活性和选择性催化剂是Ni / Al 2的比例,这也是非常稳定的500 h后在大气寿命测试压力和275摄氏度。

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