用于甲烷烟气转化的γ-Al2O3支撑镍钴催化剂的钴促进和镍钴负载效应

IF 5.3 3区 工程技术 Q2 ENERGY & FUELS
Satyam Gupta*, Saumya Tiwari, Vaibhav Kumar Arghode and Goutam Deo, 
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引用次数: 0

摘要

在本研究中,我们合成了一系列活性 Ni3Co-Al2O3 催化剂,并在 850 °C 煅烧 5 小时,以研究 (i) 以 Co 替代 Ni 对 Ni-Al2O3 催化剂催化性能的影响,以及 (ii) 金属总量对 Ni3Co-Al 在 600 °C 下进行甲烷烟气重整(FGRM)反应的催化活性的影响。我们保持较高的煅烧温度,以确保合金与支撑物之间的强相互作用。我们还合成了 Co-Al2O3 催化剂,并利用之前合成的 Ni-Al2O3 催化剂的数据分析了钴的促进作用。在 Ni3Co-Al 催化剂中,我们将 Ni/Co 的比例保持为 3,并将 Ni+Co 的用量从 5 wt % 增加到 25 wt %,以研究总金属负载的影响。H2 还原曲线显示,H2 消耗量最大的温度(Tmax 温度)是总金属负载量的函数。催化活性的比较似乎表明,催化剂在 Tmax 温度下的原位还原比在更高温度下的还原效果更好,因为有更多的表面活性位点可用。当镍被钴取代时,由于镍钴纳米合金的形成,CH4 和 CO2 的转化率以及 H2 和 CO 的产率都会增加。然而,纳米合金的分散性随金属负载量的变化而变化,当 Ni+Co = 10 wt % 时分散性最佳。这种 10Ni3Co-Al 催化剂在 600 °C、GHSV 为 120,000 mL g-1 h-1 的条件下进行 FGRM 反应时,表现出最佳的 CH4(89%)和 CO2(30%)转化率以及 H2(79%)和 CO(46%)产率。这种 10Ni3Co-Al 催化剂的转化率、产率和合金粒度变化不大,在 24 小时的运行过程中形成的碳量也很少。因此,在使用促进剂后,有必要优化活性相的负载量,以获得用于 FGRM 的最佳催化剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Cobalt Promotion and Ni+Co Loading Effects of γ-Al2O3-Supported Ni–Co Catalysts for the Flue Gas Reforming of Methane

Cobalt Promotion and Ni+Co Loading Effects of γ-Al2O3-Supported Ni–Co Catalysts for the Flue Gas Reforming of Methane

Cobalt Promotion and Ni+Co Loading Effects of γ-Al2O3-Supported Ni–Co Catalysts for the Flue Gas Reforming of Methane

In this study, we synthesize a series of active Ni3Co–Al2O3 catalysts, calcined at 850 °C for 5 h, to examine the effects of (i) substituting Ni with Co on the catalytic performance of the Ni–Al2O3 catalyst and (ii) the total metal amount on the catalytic activity of Ni3Co–Al for the flue gas reforming of methane (FGRM) reaction at 600 °C. We maintain high calcination temperatures to ensure strong alloy–support interactions. We also synthesize a Co–Al2O3 catalyst and use the data of a previously synthesized Ni–Al2O3 catalyst to analyze the effect of cobalt promotion. In the Ni3Co–Al catalysts, we maintain the Ni/Co ratio to be 3 and increase the Ni+Co amount from 5 to 25 wt % to examine the effect of total metal loading. The H2-reduction profiles reveal that the temperature where the consumption of H2 was maximum, Tmax temperature, is a function of the total metal loading. Comparison of the catalytic activities appears to suggest that in situ reduction of the catalyst at Tmax was better than the reduction at higher temperatures, since a larger number of surface active sites are available. The CH4 and CO2 conversions and H2 and CO yields increase when nickel is substituted with cobalt due to Ni–Co nanoalloy formation. However, the dispersion of the nanoalloy varies with the metal loading, and the optimum dispersion is when Ni+Co = 10 wt %. This 10Ni3Co–Al catalyst exhibits optimum CH4 (89%) and CO2 (30%) conversions and H2 (79%) and CO (46%) yields for the FGRM reaction at 600 °C for a GHSV of 120,000 mL g–1 h–1. The conversions, yields, and particle size of the alloy of this 10Ni3Co–Al catalyst do not change significantly, and an insignificant amount of carbon is formed during 24 h of operation. Thus, after using a promoter, it is necessary to optimize the loading of the active phase to obtain the best catalyst for FGRM.

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来源期刊
Energy & Fuels
Energy & Fuels 工程技术-工程:化工
CiteScore
9.20
自引率
13.20%
发文量
1101
审稿时长
2.1 months
期刊介绍: Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.
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