Design of high-temperature shift using waste-derived synthesis gas: Thermodynamic approach and practical reaction optimization

Document Type

Article

Publication Date

10-1-2023

Abstract

Herein, we verify pre-reduction conditions and H2O/CO ratio to increase activity in the HTS using Fe-Cr catalyst. It was determined that the optimal H2O/CO ratio was 2.5 through the result of calculated thermodynamic equilibrium analysis and performed HTS reaction. In the Fe-Cr catalyst, HTS reaction was performed at 350 ∼ 550 °C to find the condition that Fe2O3 convert Fe3O4 without over-reduction after reduced using 2% H2/N2, 5% H2/N2, and reactant gas at various temperature (400, 500, and 600 °C). The lower the pre-reduction temperature, the higher CO conversion, but the effect of the pre-reduction gas was not significant. In addition, as a result of performing a stability test that reduced using reactant gas at 400, 500, and 600 °C, all of which maintained stability without deactivation even though had a large range of CO conversion for 50 h. Thus, we identify that the appropriate H2O/CO ratio for HTS reaction using gas produced from waste gasification is judged to be 2.5. And during the reaction using Fe-Cr, the CO conversion showed high activity when pre-reduction temperature is 400 °C. In the case of the pre-reduction gas, the activity was insignificantly affecting the pre-reduction at 400 °C, thus it is considered appropriate to use reactant gas for practical use without the need to connect the pre-reduction gas separately.

Identifier

85167462354 (Scopus)

Publication Title

Energy Conversion and Management

External Full Text Location

https://doi.org/10.1016/j.enconman.2023.117509

ISSN

01968904

Volume

293

Grant

2021R1I1A3048595

Fund Ref

National Research Foundation of Korea

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