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Enhancement of catalytic activity in CO2 methanation in Ni-based catalysts supported on delaminated ITQ-6 zeolite.

Enhancement of catalytic activity in CO2 methanation in Ni-based catalysts supported on delaminated ITQ-6 zeolite.

Authors :
Machado-Silva, R.B.
Da Costa-Serra, J.F.
Chica, A.
Source :
Journal of Catalysis. Aug2024, Vol. 436, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

[Display omitted] • ITQ-6-based catalysts showed smaller Ni NP's and H 2 uptake than the FER-based ones. • Al-containing catalysts exhibited higher Ni dispersion and OH group concentration. • ITQ-6-based catalysts showed higher CO 2 conversion and CH 4 selectivity (>90 %). • E a calculations indicated that the associative mechanism is favored in ITQ-6 catalysts. • 15Ni/ITQ-6 (Si/Al = 30) exhibited high CO 2 conversion and CH 4 selectivity (79 % and 98 %, respectively, at 400 °C). Ni-based catalysts supported on delaminated ITQ-6 zeolite with different Si/Al ratios, 30 and ∞, were tested in the methanation of CO 2 and CO. ITQ-6 supports exhibited high surface areas (> 590 m2/g), and the catalysts based on them presented elevated CO 2 and CO conversion values, turnover frequencies (TOF), and CH 4 selectivity (> 90 %). Comparing the ITQ-6 catalyst and its precursor ferrierite (FER)-based catalyst, H 2 -chemisorption results confirmed higher metallic dispersion for the former, which resulted in improved H 2 uptake and efficient interaction of reaction intermediates via the associative pathway. Combined kinetic studies indicated that their higher available metallic surface contributed to lower apparent activation energies towards CH 4 formation, accounting for the higher selectivity values. A 15 wt% Ni-based catalyst supported on ITQ-6 zeolite (Si/Al = 30) exhibited catalytic results (X CO2 = 79 % y S CH4 = 98 %) comparable or even superior to some of the best zeolite-based catalysts reported so far. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00219517
Volume :
436
Database :
Academic Search Index
Journal :
Journal of Catalysis
Publication Type :
Academic Journal
Accession number :
178535754
Full Text :
https://doi.org/10.1016/j.jcat.2024.115609