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CO methanation toward the production of synthetic natural gas over highly active Ni/TiO 2 catalyst
Author(s) -
Shinde Vijay M.,
Madras Giridhar
Publication year - 2014
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14304
Subject(s) - catalysis , methanation , x ray photoelectron spectroscopy , hydrogen production , hydrogen spillover , chemical engineering , dissociation (chemistry) , hydrogen , materials science , oxide , nickel , inorganic chemistry , chemistry , metallurgy , organic chemistry , engineering
The sonochemical synthesis and characterization of highly active and stable Ni nanoparticles supported on TiO 2 as a CO methanation catalyst for the production of synthetic natural gas are reported. The catalyst synthesized by sonication showed higher activity for CH 4 formation than the catalyst synthesized via the conventional wet impregnation method. The activation energy was found to be 79 and 94 kJ mol −1 for the catalyst synthesized with sonication and wet impregnation method, respectively. The combined results of x‐ray photoelectron spectroscopy and x‐ray diffraction show that the enhancement in activity of the sample synthesized by sonication method is due to partial substitution of Ni in TiO 2 lattice. This creates oxide vacancies and facilitates hydrogen adsorption and spillover from nickel to support. H 2 ‐ temperature‐programmed reduction study corroborates the intimate contact of Ni with support, thus rendering strong metal support interactions. The mechanism involving Langmuir–Hinshelwood kinetics with hydrogen‐assisted CO dissociation was used to correlate experimental data. © 2013 American Institute of Chemical Engineers AIChE J , 60: 1027–1035, 2014