期刊
CATALYSIS TODAY
卷 362, 期 -, 页码 35-46出版社
ELSEVIER
DOI: 10.1016/j.cattod.2020.05.025
关键词
Ni precursor salt anions; 13X zeolite; 5A zeolite; CO2 methanation catalyst; Material properties; Catalytic performance
资金
- Abo Akademi University
- Finnish Society of Science and Letters
- China Scholarship Council (CSC)
In this study, Zeolite 13X and 5A supported Ni catalysts for CO2 methanation were synthesized using the evaporation impregnation method. The influence of different Ni precursors (nitrate, citrate, acetate) and calcination temperatures on catalyst properties and performance was investigated. It was found that the Ni precursor significantly affected the activity and stability of the catalysts, with Ni citrate synthesized 13X catalyst exhibiting the highest activity and selectivity.
Zeolite 13X and 5A supported Ni catalysts were synthesized for CO2 methanation using the evaporation impregnation method. The influence of using different Ni precursors (nitrate, citrate, and acetate) as well as calcination temperatures on the catalyst properties and performance were investigated. XRD, SEM-EDX, TEM, STEM-EDX, N-2 physisorption, H-2-TPR, TPD-NH3 and TG/DTA were used for detailed characterization of the catalysts. The parent structure of the zeolites did not change during catalyst synthesis. Using nickel citrate and acetate resulted in smaller NiO particle size compared to nitrate. STEM-EDX results showed that all the Ni-precursor complexes entered more efficiently the 13X zeolite structure, which is mainly due to steric hindrance resulting from the smaller pore size of 5A. Methanation experiments revealed that the 13X catalysts synthesized using nickel citrate (5% Ni) displayed clearly higher activity, compared to the catalysts synthesized using nickel nitrate or nickel acetate. A 79% conversion at 320 degrees C was obtained with 100% selectivity towards CH4 and the catalyst showed excellent stability during 200 h testing. Overall, it can be concluded that the Ni precursor significantly influences the physico-chemical characteristics and catalytic properties of Ni 13X and Ni 5A zeolite catalysts in CO2 methanation: complex size and pore size matter.
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