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Improving the performance of nickel catalyst supported on mesostructured silica nanoparticles in methanation of CO2-rich gas by urea–nitrate combustion

Phung-Anh Nguyen, Cam-Loc Luu, Thi-Thuy-Van Nguyen, Tri Nguyen, and Tien-Cuong Hoang

Institute of Chemical Technology-VAST, Ho Chi Minh City, Vietnam

 

E-mail: lcloc@ict.vast.vn

Received: 1 October 2019  Accepted: 16 May 2020

Abstract:

In this work, NiO supported mesostructured silica nanoparticles (MSN) were synthesized via the urea–nitrate combustion method using urea as fuel and nitrate salts as oxidants with the different urea/nitrate ratios and calcination duration. The physicochemical properties of catalysts were investigated by several techniques, including N2 physisorption measurements, powder X-ray diffraction, N2-BET isothermal adsorption, hydrogen temperature-programmed reduction, carbon dioxide temperature-programmed desorption, scanning electron microscopy and transmission electron microscopy. The obtained catalysts were employed in the methanation of CO2-rich gas at a temperature range of 225–400 °C with the CO2/H2 ratio of 1/4 and CO2 concentration of 20 mol%. The results showed that using the urea–nitrate combustion method in synthesizing catalysts led to improved physicochemical properties that increased the activity of NiO/MSN catalysts. The catalyst prepared with the urea/nitrate molar ratio of 3 and calcined at 600 °C for 3 h showed the highest catalytic performance in methanation of CO2-rich gas, reaching CO2 conversion of 96% and CH4 selectivity of 100% at 375 °C. The best catalyst has excellent stability in CO2 solo-hydrogenation at a reaction temperature of 375 °C during 30 h of reaction thanks to the resistance to coke formation. Besides, adding 1 mol% CO in the feedstock should be simultaneously conducted to surge the effectivity of CO2 methanation.

Keywords: Nickel catalyst; MSN; CO2-rich gas; Urea–nitrate combustion; CO promotion

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01207-0

 

Chemical Papers 74 (11) 3925–3935 (2020)

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