|
Catalytic conversion of carbon dioxide utilization is an important challenging topic in academia and industry today. Taking carbon dioxide reforming of propane reaction system for research, try to optimize and adjust nickel aluminum catalyst structure, to explore suitable new type catalysts for the reaction.In this paper, first of all, MoVNbOx was introduced in Ni/Al2O3system, namely preparation of a series of Ni/MoVNbOx/Al2O3catalyst, was investigated in carbon dioxide reforming of propane catalytic reaction performance, through XRD, N2adsorption, H2-TPR, CO2-TPD and TG method of the catalyst structure and surface chemical and physical properties have been characterized. Different nickel loadings, supports influence on the catalytic performance has been done. Results showed that the MoVNbOx introduction of low nickel loading (5%) of Ni/MoVNbOx/Al2O3catalysts at750℃propane conversion could reach89%, hydrogen yield reached39%. Showed that its highly active and stable, in addition, MoVNbOx was introduced to the Ru catalyst, also found that it can significantly improve the performance of the catalyst, and the activity is superior to Ru/Al2O3. These results suggest that MoVNbOx for carbon dioxide reforming of propane reaction of metal catalyst is a kind of auxiliary worthy of attention.This paper also has optimized the traditional Ni/Al2O3catalyst preparation process, to explore the suitable catalytic structure from carbon dioxide reforming of propane. Two series of contents of nickel was prepared using co-precipitation of nickel aluminium precursor, and different calcination temperature (800to1200℃), getting two series of contents of nickel and different calcination temperature of catalyst, by the XRD data, for15%nickel content nickel aluminium precursor, under800-1000℃baking temperature, mainly existed in the form of NiAl2O4and γ-Al2O3, but with the increase of temperature, particles began to grow up, in the calcination temperature of1200℃, mainly in the form of NiAl2O4and α-Al2O3; for33%nickel content nickel aluminium precursor, calcined under800癈, only existed in the form of NiAl2O4, calcined under1000-1200℃, with the dissolution of the NiO, been in the form of NIAl2O4and NiO. In terms of catalytic activity,15%nickel catalysts for propane conversion drop from92%of800℃baking at1200℃43%of roasting, hydrogen yield from55%reduced to27%. Propane conversion from83%to41%of33%nickel content, hydrogen yield from44%reduced to10%. Suggesting that, in the case of propane and carbon dioxide reforming reaction, NiAl2O4may be a better structure of active component, for traditional Ni/Al2O3, this may be a new discovery.
|