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Title

THE CATALYTIC ACTIVITIES OF NI NANO CATALYSTS USING BOTH LAZNALO4 AND γ-AL2O3 SUPPORTS IN DRY REFORMING OF METHANE

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Abstract

 THE DRY REFORMING OF METHANE (DRM) IN THE PRESENCE OF CARBON DIOXIDE, IN WHICH THE REACTION CH4 + CO2 = 2H2 + 2CO TAKES PLACE, IS A CONVENIENT PROCESS TO PRODUCE SYNTHESIS GAS [1-3]. FROM THE INDUSTRIAL STANDPOINT, NI IS THE MOST APPROPRIATE CATALYST FOR THIS REACTION, DUE TO ITS AVAILABILITY AND LOW COST [4]. HOWEVER, THE NI-BASED CATALYSTS ARE PROMPTLY DEACTIVATED BY THE DEPOSITION OF CARBON ON THE ACTIVE CENTERS. THUS, THERE IS A NEED TO IMPROVE THE ACTIVITY AND SELECTIVITY OF NI CATALYSTS WITH THE PURPOSE OF REDUCING THE COKE DEPOSITION. IN THIS WORK, WE INVESTIGATED THE DRM REACTION USING TWO DIFFERENT SUPPORTS INCLUDING LAZNALO4 AND G-AL2O3 FOR 10%NI NANO CATALYSTS. THE INFLUENCES OF THESE SUPPORTS ON THE CATALYST STABILITY, COKE DEPOSITION AND THE H2/CO RATIO WERE ALSO STUDIED AND COMPARED. THE 10%NI BASED CATALYSTS SUPPORTED ON BOTH G-AL2O3 AND LAZNALO4 WERE PREPARED BY INCIPIENT WETNESS IMPREGNATION METHOD. THE SAMPLES WERE NAMED 10%NI/LAZNALO4 AND 10%NI/G-AL2O3 RESPECTIVELY. THE NANO CATALYSTS WERE CHARACTERIZED BY SEVERAL TECHNIQUES SUCH AS TPR, BET, XRD, TGA AND FE-SEM. THE REFORMING REACTIONS WERE CARRIED OUT IN A QUARTZ-TUBE FIXED BED REACTOR USING A RATIO OF 1:1 FOR CO2:CH4 FEED, TEMPERATURES BETWEEN 600-800°C AND ATMOSPHERIC PRESSURE CONDITION. THE TPR, TGA AND FESEM ANALYSIS DEMONSTRATED STRONGER SUPPORT-METAL INTERACTION AND SMALLER NIO PARTICLES FOR THE 10%NI/LAZNALO4 CATALYST AT LOWER HEAT TREATMENT TEMPERATURE. THE COMPARISON OF 10%NI/LAZNALO4 AND 10%NI/G-AL2O3 NANO CATALYSTS IN DRY REFORMING SHOWS THE HIGHER ACTIVITY, SELECTIVITY AND STABILITY FOR THE 10%NI/LAZNALO4 NANO CATALYST WITH THE LOWER CARBON DEPOSITION.

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