CO2 capture from hydrogen-containing mixture on the sorbent 17 wt. % NaNO3/MgO in sorption-enhanced water-gas shift reaction

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Abstract

CO2 capture from mixture approximate in composition to the products of steam reforming of methane has been studied using the sorbent 17 wt. % NaNO3/MgO. The possibility of capturing up to 5 mmol CO2 per gram of the sorbent (24.4 mas. %) at temperatures of 200–220°C and a mixture pressure of 10 atm has been demonstrated. It has been found that the regeneration of the sorbent proceeds faster and deeper at atmospheric pressure in a stream of humid nitrogen. For the first time the water-gas shift reaction on the mechanical mixture of 5 wt. % Pt/Ce0.75Zr0.25O2 catalyst and 17 wt. % NaNO3/MgO CO2 sorbent at a pressure of 10 atm has been studied. It has been shown that hydrogen purity more than 99% in dry gas mixture is provided during 8 minutes at the reaction (sorption) temperature 260°C, pressure 10 atm and GHSV 8000 h–1 on the mechanical mixture of the catalyst and the sorbent by volume ratio 1:2 respectively that corresponded to a sorption capacity of about 11 mmol CO2 per gram of the sorbent (53.7 mas. %).

About the authors

I. E. Nikulina

Boreskov Institute of Catalysis SB RAS

Email: ikar@catalysis.ru
Novosibirsk, Russia

A. M. Gorlova

Boreskov Institute of Catalysis SB RAS

Novosibirsk, Russia

I. Yu. Petrov

Boreskov Institute of Catalysis SB RAS

Novosibirsk, Russia

D. I. Potemkin

Boreskov Institute of Catalysis SB RAS

Novosibirsk, Russia

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