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Title

THE INFLUENCE OF THE ADDITION OF TRANSITION METALS AS PROMOTERS INTO PT-SN/AL2O3 CATALYSTS IN PROPANE DEHYDROGENATION

Pages

 Start Page | End Page

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Abstract

 THE CATALYTIC DEHYDROGENATION OF PROPANE TO PROPYLENE IS OF INCREASING IMPORTANCE BECAUSE OF THE GROWING DEMAND FOR PROPYLENE [1]. IN PT-BASED DEHYDROGENATION CATALYSTS, TIN AND ALKALI METAL PROMOTERS ARE COMMONLY USED TO PROMOTE PT AND TO NEUTRALIZE THE RESIDUAL ACIDITY OF THE SUPPORT, RESPECTIVELY [2]. RECENTLY, SEVERAL STUDIES HAVE BEEN FOCUSED ON THE IMPROVEMENT OF THE SELECTIVITY AND STABILITY OF PTSN/G-AL2O3 CATALYSTS BY INCORPORATING SOME ADDITIONAL METAL PROMOTERS.IN THIS WORK THE EFFECT OF ADDITION OF CO AND ZN (0.3, 0.5 AND 0.7 WT%) TO PTSNK/G-AL2O3 CATALYST BY INCIPIENT WETNESS IMPREGNATION WAS STUDIED. THE CATALYSTS WERE CHECKED FOR NOMINAL METAL LOADINGS BY XRF METHOD. THE CATALYTIC PERFORMANCE TESTS WERE PERFORMED IN A FIXED-BED QUARTZ REACTOR FOR CATALYST SCREENING IN PROPANE DEHYDROGENATION. THE RESULTS SHOWED THAT PTSNZNK/G- AL2O3 (ZN=0.7 WT%) HAD A BETTER PERFORMANCE IN TERM OF PROPYLENE SELECTIVITY (FIG. 1). IT COULD BE ATTRIBUTED TO THE STRONG INTERACTIONS BETWEEN ZN AND PT, WHICH RESULT IN THE FORMATION OF PTZN ALLOYS AND THE CHANGE IN ELECTRONIC PROPERTY OF PT ATOM (E.G., THE FORMATION OF PTD−-ZND+ ENTITIES). ZINC CAN ALSO IMPROVE THE SELECTIVITY DUE TO GEOMETRIC EFFECTS BY REDUCING THE PT ENSEMBLE SIZES AND INCREASING PT DISPERSION [3]. IN CONTRAST, THE ADDITION OF CO DID NOT ENHANCE THE SELECTIVITY OVER THE INDUSTRIAL CATALYST ALTHOUGH THE STABILITY IMPROVED BECAUSE OF SUPPRESSION OF COKE FORMATION.

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