Publication Type Journal Article
Title Boosting Ni Dispersion on Zeolite-Supported Catalysts for CO2 Methanation: The Influence of the Impregnation Solvent
Authors Maria C. Bacariza Salman Amjad Paula Alexandra Lourenço Teixeira JM Lopes; José M. Lopes Carlos Henriques
Groups CATHPRO
Journal ENERGY \& FUELS
Year 2020
Month November
Volume 34
Number 11
Pages 14656-14666
Abstract In this work, an enhancement of Ni-0 particle dispersion over zeolite-supported catalysts was intended by tuning the impregnation solvent. For this purpose, a series of 15 wt \% Ni catalysts supported over a Cs-USY zeolite were prepared by incipient wetness impregnation using water, ethanol, methanol, 2-propanol, acetone, or ethylene glycol as solvents. Samples were characterized by TGA, N-2 adsorption, XRD, DRS UV-Vis, H-2-TPR, CO2-TPD, and TEM and catalytically tested at atmospheric pressure under CO2 methanation conditions (86,100 mL g(cat)(-1), P-CO2 = 0.16 bar, H-2/CO2 = 4:1). The use of organic solvents rather than water increased the number of weak and medium basic sites, while 2-propanol and ethylene glycol promoted metal-support interactions. The average Ni-0 particle sizes after reduction at 470 degrees C were significantly different for all the studied solvents, ranging from 13 to 34 nm. Despite the beneficial properties exhibited by the catalyst prepared using ethylene glycol concerning metal particle dimensions and the number of weak and medium basic sites, 2-propanol allowed the highest CO2 conversion and CH4 selectivity (64 and 95\%, respectively, at 350 degrees C), probably because of the partial damage of the zeolite structure observed when ethylene glycol was used. Materials prepared within this work were finally compared with other Ni-based catalysts from the literature, assessing the corresponding catalytic activity from CH4 production rates. Their performances were shown to be similar to or higher than those of the literature materials, thus confirming the relevance of these Ni/zeolite catalytic systems and motivating further developments towards this reaction.
DOI http://dx.doi.org/10.1021/acs.energyfuels.0c02561
ISBN
Publisher
Book Title
ISSN 0887-0624
EISSN 1520-5029
Conference Name
Bibtex ID ISI:000592961700118
Observations
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