Ni-Co catalyst derived from layered double hydroxides for dry reforming of methane

摘要

Ni/Co monometallic and bimetallic layered double hydroxides (LDH) were in-situ synthesized on the surface of gamma-Al2O3 by urea precipitation method. Then they were decomposed and reduced by H-2/Ar atmospheric plasma jet at 400 degrees C for 15 min to become into catalysts. The LDH precursors were verified by XRD, SEM, FT-IR and Raman, while the catalysts were characterized by N-2 adsorption-desorption, XRD, TEM and H-2-TPR. After that their catalytic activity and stability were evaluated in dry reforming of methane (DRM) reaction. Both Ni and 2Ni-1Co showed better catalytic performance than other catalysts. Finally, the weight and species of carbon deposition on spent catalyst were tested by TG-DTA analysis. The deposition of inert carbon was the main reason for deactivation of catalysts in DRM. Moreover, a highly uniform dispersion and small particle size of active component are achieved by in situ co-precipitation method, and gamma-Al2O3 provided large specific surface area for these Ni/Co catalysts. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.