Study on dry reforming of methane catalyzed by coal char-Ni composite and electrochemical performance of formed carbon materials after reaction
Dry reforming of methane(DRM)can convert two greenhouse gases CH4 and CO2 into syngas,which has significantly environmental and economic benefits.However,the high reaction temperature and carbon deposition during the DRM process can easily cause the deactivation of metal catalysts such as Ni,limiting its application in industry.At present,coal pyrolysis char(referred to as"coal char")has good potential as supports of high effective Ni-based catalysts.In order to improve performance of DRM reaction and promote the utilization of coal char,a coal char-Ni complex was designed and prepared with K2CO3 as an additive.The DRM reaction performance,surface and structural properties of the formed carbon materials from the coal char-Ni complex after the reaction and its performance as supercapacitor electrode materials were investigated.The results demonstrate that the initial CH4 and CO2 conversion rates reach 71%and 72%,respectively when m(coal char):m(K2CO3):m(Ni)=1.00:1.00:0.05 and the temperature is 850℃.After optimizing the reaction conditions(including Ni loading amounts,the temperature and reaction time of DRM reaction),the formed carbon materials from the spent char-Ni complex,serving as supercapacitor electrodes,can show good electrochemical properties.CC-2 has specific capacitances of 136 F/g at a scanning rate of 5 mV/s and 143 F/g at a current density of 1 A/g.This study provides a potential path for the synergistic conversion of DRM and coal char and recycling of the spent carbon materials(catalysts or supports of catalysts in the reaction).
dry reforming of methanecoal charNielectrode materialsspecific capacitance
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