Journal
TOPICS IN CATALYSIS
Volume 59, Issue 2-4, Pages 314-325Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-015-0435-4
Keywords
USY zeolite; CO2 methanation; Microwave; Conventional heating; Calcination temperature; Catalytic activity
Categories
Funding
- Fundacao para a Ciencia e Tecnologia (FCT) [SFRK/BD/52369/2013]
- European Union [309984]
Ask authors/readers for more resources
In this work, CO2 methanation reaction was studied on Ni-based zeolite catalysts, which were prepared by incipient wetness impregnation of USY zeolite with 5 wt% Ni. The effects of the drying method after impregnation, the calcination temperature and the pre-reduction temperature on the catalysts performances were evaluated. The catalysts were characterized by N-2 adsorption, hydrogen temperature programmed reduction, diffuse reflectance UV-Vis spectroscopy (DRS UV-Vis), transmission electron microscopy and X-ray diffraction. Drying under microwaves irradiation induced remarkable changes on the type, location and reducibility of Ni species at the same time that leaded to effects in the structural and textural properties of the support and in the average nickel particle size. As a result, changes in the catalytic performances were observed. The calcination temperature changed the location and reducibility of the Ni species being concluded that calcining at 300 degrees C leads to higher conversions and selectivities. At high reduction temperatures the amount of reduced Ni species (active sites) was greater, but the impact of sintering processes was also stronger. For catalysts with 5 % Ni, the reduction at 550 degrees C was observed as the most favourable. However for 14 % Ni sample no remarkable effects were observed by reducing at higher temperatures. Thus, it was proved that CO2 conversion and CH4 selectivity can be maximised through the proper choice of both preparation and pre-reduction conditions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available