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Effect of Magnetic Inducement in Preparation of Ni/Ce‐doped Al 2 O 3 for Ammonia Decomposition
Author(s) -
Vacharapong Pumiwat,
Arayawate Sirintra,
Henpraserttae Suparoek,
Katanyuta Sasimas,
Charojrochkul Sumittra,
Lawtrakul Luckhana,
Toochinda Pisanu
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201902663
Subject(s) - catalysis , decomposition , dispersion (optics) , doping , ammonia , materials science , yield (engineering) , inorganic chemistry , non blocking i/o , chemistry , nuclear chemistry , analytical chemistry (journal) , chemical engineering , metallurgy , organic chemistry , physics , optoelectronics , optics , engineering
Catalytic activity of Ni catalysts for NH 3 decomposition can be enhanced by using Ce‐doped Al 2 O 3 support. Magnetic inducement during sol‐gel preparation of supports was studied to enhance the Ce dispersion in Al 2 O 3 framework. In this study, the same poles and different pole of magnetic arrangement were applied during the sol‐gel preparation. Ni catalysts over the supports were investigated for the NH 3 decomposition activity along with catalyst and support properties, including Ce dispersion in Al 2 O 3 framework, Ni dispersion, acidic sites, basic sites, and reaction kinetics. The magnetic inducement can control the Ce composition and uniformity in the Al 2 O 3 framework. The Ni/Ce‐doped Al 2 O 3 prepared under the same poles of magnetic inducement show significant improvements in Ni dispersion, and yield highest catalytic activity due to a high Ce composition and uniformity in the framework, as well as the high Lewis basic sites which enhance the limiting step of NH 3 decomposition. Thus, combination of the partial doping with magnetic inducement provides a novel approach with low cost to improve the activity of Ni catalyst without changing the reaction mechanism.