Abstract
Catalysts 16NixFe/Al2O3(xis 0, 1, 2, 4, 6, 8) were prepared by incipient wetness impregnation method and the catalytic performance for the production of synthetic natural gas (SNG) from CO hydrogenation in slurry-bed reactor were studied. The catalysts were characterized by BET, XRD, UV-Vis DRS, H2-TPR, CO-TPD, and XPS, and the results showed that the introduction of iron improved the dispersion of Ni species, weakened the interaction between Ni species and support and decreased the reduction temperature and that catalyst formed Ni-Fe alloy when the content of iron exceeded 2%. Experimental results revealed that the addition of iron to the catalyst can effectively improve the catalytic performance of low-temperature CO methanation. Catalyst 16Ni4Fe/Al2O3with the iron content of 4% exhibited the best catalytic performance, the conversion of CO and the yield of CH4reached 97.2% and 84.9%, respectively, and the high catalytic performance of Ni-Fe catalyst was related to the property of formed Ni-Fe alloy. Further increase of iron content led to enhancing the water gas shift reaction.
Highlights
The production of synthetic natural gas (SNG) from coal or biomass has attracted much attention in recent years, especially in China, because of the increasing demands for natural gas and the wish for enhancing domestic energy security [1, 2]
The gasification of coal results in the production of syngas containing mainly H2 and CO; after the gas cleaning, the H2/CO ratio of the syngas can be adjusted to suitable ratio by water-gas shift reaction (WGSR) and the syngas can be converted to SNG through CO methanation
It is well known that Fe-based catalysts show high water gas shift activity, and it can be seen that the increase of iron content aggravated the water gas shifted reaction [23], resulting in the more production of CO2
Summary
The production of synthetic natural gas (SNG) from coal or biomass has attracted much attention in recent years, especially in China, because of the increasing demands for natural gas and the wish for enhancing domestic energy security [1, 2]. The slurry-bed reactor can remove the reaction heat efficiently and keep the reaction at isotherm low temperature so as to minimize the catalyst deactivation and avoid the limitation on CH4 yield resulting from thermodynamic equilibrium [9, 10]. To develop an active and stable low-temperature methanation catalyst for a slurry-bed reactor is more difficult, and only a few studies have been done in the laboratory [11, 12]. Numerous catalysts have been used for fixed-bed methanation reaction [9] Among these catalysts, Ni-based catalysts have been widely employed due to the relatively low cost, high activity, and high selectivity to methane [13,14,15,16]. The effects of Fe content on surface structure and catalytic performance of the catalysts for low-temperature CO methanation in slurry-bed reactor were studied
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