The characterization of a highly effective NiO/MgO solid solution catalyst in the CO2 reforming of CH4

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	The characterization of a highly effective NiO/MgO solid solution catalyst in the CO2 reforming of CH4
	Hu, YH ; Ruckenstein, E ; Hu YX(胡云行)
刊名	http://dx.doi.org/10.1023/A:1018982304573
	1997
关键词	CARBON-DIOXIDE NICKEL-CATALYSTS MAGNESIUM-OXIDE SYNTHESIS GAS METHANE ADSORPTION REDUCTION SURFACE MONOXIDE HYDROGEN
英文摘要	A NiO/MgO catalyst prepared by impregnation, which reduced in H-2 had very high CO yield and stability in CO2 reforming of methane, was investigated by XPS, XRD, BET and pulse-MS response. This catalyst was compared to that obtained by mechanical mixing of powders of the two oxides. It was found that the entire NiO formed a solid solution with MgO in the former catalyst, while only a fraction of NiO formed a solid solution with MgO in the latter one. BET revealed that, in contrast to NiO and MgO, the NiO/MgO catalyst prepared by impregnation had a high stability to sintering, because its surface area hardly changed during calcination from 1.5 to 20 h at 800 degrees C. In the same catalyst, a surface enrichment in MgO, which was greater after than before reduction, was detected. Compared to MgO or NiO, this catalyst had a lower Mg(2p) and a higher Ni(2p(3/2)) binding energy. This indicates that electron transfer from NiO to MgO took place, which, increasing the binding between the two oxides, might be responsible for the resistance of the solid solution to sintering. Because of the interactions between Ni and Mg, the clustering of Ni, which stimulates carbon deposition is inhibited. This explains the high stability of the CO yield in the CO2 reforming of methane over the NiO/MgO catalyst prepared by impregnation. The pulse-MS response suggested that the decompositions of CO2 to CO and O and of CH4 to C and H are involved in the reaction mechanism of CO2 reforming of methane over the reduced NiO-MgO solid solution catalyst.
语种	英语
出版者	CATAL LETT
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/88483]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Hu, YH,Ruckenstein, E,Hu YX. The characterization of a highly effective NiO/MgO solid solution catalyst in the CO2 reforming of CH4[J]. http://dx.doi.org/10.1023/A:1018982304573,1997.
APA	Hu, YH,Ruckenstein, E,&胡云行.(1997).The characterization of a highly effective NiO/MgO solid solution catalyst in the CO2 reforming of CH4.http://dx.doi.org/10.1023/A:1018982304573.
MLA	Hu, YH,et al."The characterization of a highly effective NiO/MgO solid solution catalyst in the CO2 reforming of CH4".http://dx.doi.org/10.1023/A:1018982304573 (1997).