Publicación: CATALYTIC CONVERSION OF MODEL TARS OVER CARBON-SUPPORTED NI AND FE.
Fecha
2018
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TAR REMOVAL FROM GASIFICATION GASES IS A DETERMINANT STEP TO GUARANTEE THE OPERATIONAL FEASIBILITY OF GASIFICATION-TO-CHEMICALS/ENERGY SYSTEMS. THIS STUDY AIMED TO DEVELOP NOVEL CARBON-SUPPORTED CATALYSTS FOR THE ELIMINATION OF TARRY AROMATICS (TOLUENE, NAPHTHALENE AND BENZENE) FROM GASIFICATION GASES. EFFECTS OF REACTION TEMPERATURE (700 < T < 900 °C) AND CATALYST NATURE (FE0 AND NI0) ON THE ACTIVITY WERE ASSESSED BY CONSIDERING THERMO-CATALYTIC CONVERSION AND STEAM REFORMING, UNDER A SIMULATED GASIFICATION GAS. THE CATALYSTS (NI AND FE) AND SUPPORT (AC) WERE CHARACTERIZED BY X-RAY DIFFRACTION (XRD), N2 PHYSISORPTION, THERMOGRAVIMETRIC ANALYSIS (TGA), TRANSMISSION ELECTRON MICROSCOPY (TEM) AND COMPOSITIONAL ANALYSES. BOTH CATALYSTS AND SUPPORT, PRESENTED A MESOPOROUS-LIKE TEXTURE WITH A CONSIDERABLE HIGH SURFACE AREA (690 < SBET < 743 M2/G). FURTHERMORE, DISPERSION OF THE METAL NANOPARTICLES (ACTIVE PHASE) WAS UNIFORM AS CONFIRMED BY TEM IMAGES. RESULTS FROM ACTIVITY TESTS SUGGEST THAT NI/AC HAS HIGHER EFFECTIVITY FOR CONVERTING TARS THAN FE/AC, AS CONFIRMED BY THE LOW APPARENT ACTIVATION ENERGIES (34 < EAPP < 98 KJ/MOL) FOR NAPHTHALENE AND BENZENE CONVERSION BETWEEN 700 AND 900 °C. THE CONVERSION WAS 100% ABOVE 850 °C; NEVERTHELESS; BELOW 750 °C, A SHARP REDUCTION IN BENZENE CONVERSION WAS OBSERVED, WHICH WAS ATTRIBUTED TO REVERSIBLE CARBON DEPOSITION.
