Study of a Preparation of Mordenite Supported Pt/Ga/K Catalysts for Chemical
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2011-01-24
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Journal of Science and Technology Mahasarakham University - วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยมหาสารคาม
Abstract
Bimetallic (Pt or Pd and Ga) catalysts were prepared by consecutive impregnation on mordenite. The catalyst wasfurther impregnated with potassium (K) to reduce its acidity. The catalysts were characterized by X-ray diffraction(XRD), nitrogen adsorption (BET) and ammonia temperature programmed desorption (NH3-TPD). The catalyticactivity of the bimetallic catalysts was compared with the monometallic catalysts in conversion of n-hexane. A highercatalytic activity was obtained for Pt catalyst in comparison with Pd sample under the same reaction condition:catalyst 1 g, weight hourly space velocity (WHSV) of 1, 1 h time on stream and reaction temperature at 400°C. Theresults indicate that Ga incorporation changes the product selectivity, selectivity towards dehydrogenation products was increased but selectivity towards isomerization products was decreased. The catalyst with K addition, 0.5 Pt/1Ga/3% K/M exhibits enhanced selectivity to aromatics (9.5%) which is due to decreased acidity of the catalyst.
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Journal of Science and Technology Mahasarakham University - วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยมหาสารคาม; Volume.29 Numer.4 october-december 2010; 351-358