Catalytic reforming catalyst preparation

In this work, the catalytic reforming of CH4 by CO2 over Ni based catalysts was investigated to develop a high performance anode catalyst for application in an internal reforming SOFC system. The prepared catalysts were characterized by N2 physisorption, X-ray diffraction (XRD) and temperature programmed reduction (TPR). 

Catalytic reforming has become the most important process for the preparation of aromatics. The two major transformations that lead to aromatics are dehydrogenation of cyclohexanes and dehydrocyclization of alkanes. Additionally, isomerization of other cycloalkanes followed by dehydrogenation (dehydroisomerization) also contributes to aromatic formation. The catalysts that are able to perform these reactions are metal oxides (molybdena, chromia, alumina), noble metals, and zeolites. 

Ni/Al203 catalysts prepared by coprecipitation exhibit excellent sintering stability and can be used in many catalytic reactions. The most important ones are certainly steam reforming (Section B.3.3) and metha-nation (Section B.3.6) reactions. 

Detailed catalyst synthesis and characterization and evaluation of performance and kinetics of the steam reforming of crude ethanol were investigated. Catalysts prepared by precipitation, coprecipitation, and impregnation methods were compared. Catalyst containing 15wt% Ni synthesized by precipitation method produced smaller Ni crystallite sizes and better reducibility and hence a better catalytic performance. 

Marked difference of catalytic behavior by preparation methods in CH4 reforming with CO2 over M02C and WC catalysts... 

Another useful probe for indicating the extent of Pt-Re alloying on reforming catalysts is cyclopentane hydrogenolysis, the alloy being intrinsically more active than either pure metal [79, 80]. In Fig. 9.3, the synergy in the activity shows a great interaction between the two metals for Pt-Re catalysts prepared by catalytic reduction [30]. 

It has been also reported that the catalytic behaviour of Co catalysts for steam reforming of ethanol is enhanced by promotion with Fe or Mn as a consequence of the effect of these metals on cobalt reducibility. The catalytic activity of Co catalysts supported on ZnO and promoted with Fe and Mn (1 %) was compared with that of Ni catalysts supported on LaaOs-AlgOs. The Co catalysts do not promote methane-forming reactions such as ethanol cracking and acetaldehyde decarbonylation, nor do they facilitate the reverse methane steam reforming reaction. The promotion effect of Mn on Co/ZnO catalysts in the steam reforming of ethanol has been studied in coprecipitated catalysts. Alloy particles in Co-Mn/ZnO catalysts prepared by... 

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