The structure and performance of (Ni4Fe)mAg(PrZr4)nOx catalyst for ethanol steam reforming
作者： H D Wu , H Z Liu , T S Liu
DOI: 10.1088/1757-899X/392/5/052009
关键词:
摘要: Co-precipitation method is used to synthesize PrpZrqOx composite oxide support and impregnation adopted in preparing (Ni4Fe)mAgPrpZrqOx catalysts. X-ray power diffraction (XRD), Temperature programmed reduction (TPR) oxidation (TPO) are characterize the The results indicate that not only improvement of catalytic activity remarkable, but also an excellent capacity resistance carbon deposition when Ag dropped into Ni-Fe bimetallic XRD spectrum fresh (Ni4Fe)mAg(PrZr4)nOx catalysts present characteristic peak tetragonal crystal phase ZrO2, rhombohedral Fe2O3, hexagonal NiO cubic Ag2O while no praseodymium appears because doped ions can enter ZrO2 lattice. After 823K's pretreatment by H2, main active components Ni0 Ag0. TPR shows presence great benefit Fe2O3 NiO: peaks maximum due Fe2O3→Fe3O4 NiO→Ni0 Ag-containing sample shifted more than 150K lower temperatures comparison with metallic (Ni4Fe)16Ag(PrZr4)64.8Ox catalyst its best ethanol steam reforming. Under following conditions, reaction temperature 773K, ethanol/water molar ratio 1:6, weight hourly space velocity (WHSV) 11.8 h−1, conversion rates nearly 100% percentage CO, CH4, CO2 70.5%, 1.8%, 7.9%, 19.6% respectively.
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