Production of hydrogen by steam reforming of phenol over Ni/Al_2O_3-ash catalysts

摘要

An improved method for hydrogen production by the steam reforming of phenol over novel fly ash-based catalysts is investigated. The Ni/Al2O3-ash catalysts are prepared by an equal-volume impregnation method and characterized by XRD, FESEM, BET and H-2-TPR techniques. The effects of various process parameters including mixing ratio of fly ash, temperature, support, gas hourly space velocity (GHSV) and steam-to-carbon molar ratio (S/C) on the catalytic activity are investigated. The results show that fly ash mixing at 50 wt % and choosing g-Al2O3 as the support own the best performance. A maximum hydrogen yield of 83.8% is achieved at 450 degrees C with a S/C of 10 and a GHSV of 4968 h(-1) with a maximum phenol conversion of 98.6%. The stability of the Ni-ash1-gamma A1 catalyst is further investigated and it is shown to continuously and stably react for more than 20 h at 450 degrees C with excellent catalytic reaction stability. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.