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Ni‐Ce/Zeolites for CO 2 Hydrogenation to CH 4 : Effect of the Metal Incorporation Order
Author(s) -
Bacariza M. Carmen,
Graça Inês,
Lopes José M.,
Henriques Carlos
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201800204
Subject(s) - methanation , bimetallic strip , catalysis , zeolite , nickel , materials science , adsorption , metal , inorganic chemistry , chemistry , metallurgy , organic chemistry
The effect of the metal incorporation order used in the preparation of bimetallic ultrastable Y (USY) zeolite catalysts for CO 2 methanation has been studied. First, a Na‐USY(3) zeolite was impregnated with 5 % of Ni and 3 % of Ce in three ways: Ni before Ce (Ce/Ni), Ce before Ni (Ni/Ce), and co‐impregnation (Ni‐Ce). Stronger interactions between Ni and Ce species are established when Ni is incorporated after or simultaneously with Ce, enhancing the reducibility of the Ni species and decreasing the Ni 0 average size to approximately 2.5 nm. However, the CO 2 adsorption capacity is smaller for the sample in which Ce is incorporated before Ni. Even though larger Ni 0 particles (13.3 nm) are formed when Ni is impregnated first, a good CO 2 adsorption capacity was also observed for this sample. Co impregnation was finally found as the best preparation method, the results being confirmed for an optimized USY catalyst in terms of Ni content, Si/Al ratio, and compensating cation.