Ni-Fe /MCM-41双金属催化剂的制备及其CO甲烷化催化活性

IF 2.1 4区 化学 Q3 CHEMISTRY, PHYSICAL Progress in Reaction Kinetics and Mechanism Pub Date : 2020-05-01 DOI:10.1177/1468678319870327
Zhang Jiaying
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引用次数: 4

摘要

采用初湿浸渍法制备了一系列Ni - Fe/MCM-41双金属催化剂以及Ni/MCM-41和Fe/MCM-41双金属催化剂,并在连续流微反应器上对其CO甲烷化活性进行了测试。结果表明,Ni - Fe/MCM-41双金属催化剂在低温(200℃~ 325℃)下的催化活性远高于Ni/MCM-41和Fe/MCM-41催化剂。10%Ni-5%Fe /MCM-41催化剂在压力为1.5 MPa、H2与CO摩尔比为3:1、质量时空速为12,000 mL h−1 g−1、温度为350℃条件下,CO转化率接近100%,CH4选择性为98%。通过N2物理吸附、x射线衍射和h2程序升温还原对催化剂进行了表征。结果表明,Fe的加入使Ni - Fe/MCM-41催化剂的活性提高的主要原因是Ni - Fe/MCM-41催化剂的Ni颗粒和Ni - Fe合金的形成更细。
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Preparation of bimetallic Ni–Fe/MCM-41 catalysts and their catalytic activity for CO methanation
A series of Ni–Fe/MCM-41 bimetallic catalysts and also Ni/MCM-41 and Fe/MCM-41 catalysts were prepared by the incipient-wetness impregnation method and tested for their activity for CO methanation in a continuous-flow microreactor. The results showed that the catalytic activities of the Ni–Fe/MCM-41 bimetallic catalysts were much higher than those of the Ni/MCM-41 and Fe/MCM-41 catalysts at low temperatures (200°C–325°C). The 10%Ni–5%Fe/MCM-41 catalyst showed the best activity with a CO conversion of almost 100% and a CH4 selectivity of 98% at 350°C under a pressure of 1.5 MPa with a 3:1 molar ratio of H2 to CO and a weight hourly space velocity of 12,000 mL h−1 g−1. The catalysts were characterized by N2 physisorption measurements, X-ray diffraction, and H2-temperature-programmed reduction. The results showed that the addition of Fe will lead to the formation of finer Ni particles and Ni–Fe alloy, which were the main reasons for the activity increase in the Ni–Fe/MCM-41 catalysts.
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来源期刊
CiteScore
2.10
自引率
0.00%
发文量
5
审稿时长
2.3 months
期刊介绍: The journal covers the fields of kinetics and mechanisms of chemical processes in the gas phase and solution of both simple and complex systems.
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