Developmint of Structured Catalyst for Gasoline POX Reforming in Fuel Cell Powered vehicles
Structured Catalyst Gasoline POX Reforming Fuel Cell;
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To develop high-performance structured catalyst for fuel cell powered vehicles applications, the breakage mechanisms and fine grinding characteristics of alumina were investigated by means of a stirred ball attrition mill. The variation of particle size with grinding time was measured and grinding rate constant with grinding time was estimated by calculating mathematical modeling applying to theoretical grinding equation. The grinding kinetics approach was successfully applied to the analysis of particle size distributions obtained under various grinding times. It was found that grinding rate constant decreased with increasing solid contents and media size, and increased with increasing the rotational speed. It was found that the pH-value of the product suspension slightly increased with the specific surface area during the comminution process. The particle size distributions estimated from grinding rate constant were in good agreement with the experimental data. Structured POX reforming catalyst supported on a ceramic honeycomb was prepared by washcoating method. The optimum condition for preparing structured catalyst is that solid contents of alumina and Catalyst were 40wt% and 20wt% respectively, pH value of alumina slurry was 3, BET surface area of the modified structured support was 40∼50㎡/g and loading precentages of catalyst were 30∼36%, respectively. POX reforming reaction of gasoline in a kW-class gasoline reforming system were carried out in the temperature range of 500∼800 ℃ at the fixed reaction conditions as a space velocity of 1000 h^(-1) and at molar ratios of H₂O/C=3 and O/C=1. It was identified that the SC-22 catalyst displayed better activity than the others prepared catalysts in the POX reforming reaction of iso-octane. It was found that the structured catalyst washcoated ICI catalyst on the modified structured support was higher activity than the structured catalyst washcoated ICI on the ceramic honeycomb, directly. These results may be interpreted that the activity of structured catalyst was correlation with the BET surface area of modified structured support washcoated submicron alumina. Studies on the development of a high performance structured catalyst will be needed.