| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 91 === Abstract
The major purpose of this study is to investigate the effects of addit -ive and feed composition on the copper series catalysts for methanol re -forming. γ-Al2O3 was used as support and copper loading varied from 5wt.% to 25wt.%. The catalysts were prepared by electroless-plating me -thod, impregnation method and urea-hydrolysis method. The promoters include Cr, Zn,Ce and were loaded by impregnation method.The parame -ters for feed composition include H2O/CH3OH ratio and O2/CH3OH ratio, the former varied from 0.6~1.6 and the latter from 0 to 0.15. The catalysts were characterized by BET, XRD, TPR, N2O chemisorption, ESCA and EA.
For pure copper catalysts, the experimental shows that the catalyst with 15wt.% Cu, prepared by electroless-plating method present the best activity for methanol reforming. When adding promoter into the copper catalyst, Cr displays better promoting effect than Zn and Ce. TPR profile and N2O chemisorption also show that the addition of any promoter is helpful for copper disprtsion.
For methanol reforming,the data indicate that the optimum H2O/ CH3OH ratio is 1.0 for methanol conversion, but CO2 selectivity always increases with increasing H2O/CH3OH ratio. When O2 was added into feed steam, both methanol conversion and CO2 selectivity increases with increasing O2/CH3OH ratio upto 0.075.
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