CO<sub>2</sub> Reforming of Biomass Gasification Tar over Ni-Fe-Based Catalysts in a DBD Plasma Reactor
The removal of tar and CO<sub>2</sub> represents a critical challenge in the production of biomass gasification syngas, necessitating the development of advanced catalytic systems. In this study, plasma-enhanced catalytic CO<sub>2</sub> reforming was employed to remove biomas...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-02-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/5/1032 |
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| Summary: | The removal of tar and CO<sub>2</sub> represents a critical challenge in the production of biomass gasification syngas, necessitating the development of advanced catalytic systems. In this study, plasma-enhanced catalytic CO<sub>2</sub> reforming was employed to remove biomass tar, with toluene selected as a model compound for biomass tar. Supported Ni<sub>x</sub>-Fe<sub>y</sub>/Al<sub>2</sub>O<sub>3</sub> catalysts, with varying Ni/Fe molar ratios (3:1, 2:1, 1:1, 1:2, and 1:3), were synthesized for the CO<sub>2</sub> reforming of toluene in dielectric barrier discharge (DBD) non-thermal plasma reactors. The experiments were conducted at 250 °C and ambient pressure. The effects of various Ni/Fe molar ratios, discharge powers, and CO<sub>2</sub> concentrations on DBD plasma-catalytic CO<sub>2</sub> reforming of toluene to synthesis gas were analyzed. The results indicate that CO and H<sub>2</sub> are the primary gaseous products of toluene decomposition, with the selectivity for these gaseous products increasing with the discharge power. Increasing discharge power leads to a higher selectivity for CO and H<sub>2</sub> production. A CO<sub>2</sub>/C<sub>7</sub>H<sub>8</sub> ratio of 1.5 was found to effectively enhance the catalytic performance of the system, leading to the highest toluene conversion and syngas selectivity. The selectivity of the Ni<sub>x</sub>-Fe<sub>y</sub>/Al<sub>2</sub>O<sub>3</sub> catalysts for H<sub>2</sub> and CO follows the following order: Ni<sub>3</sub>-Fe<sub>1</sub>/Al<sub>2</sub>O<sub>3</sub> > Ni<sub>2</sub>-Fe<sub>1</sub>/Al<sub>2</sub>O<sub>3</sub> > Ni<sub>1</sub>-Fe<sub>1</sub>/Al<sub>2</sub>O<sub>3</sub> > Ni<sub>1</sub>-Fe<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> > Ni<sub>1</sub>-Fe<sub>3</sub>/Al<sub>2</sub>O<sub>3</sub>. Notably, the Ni<sub>3</sub>-Fe<sub>1</sub>/Al<sub>2</sub>O<sub>3</sub> catalyst exhibits a high CO<sub>2</sub> adsorption capacity due to its strong basicity, demonstrating significant potential for both tar conversion and carbon resistance. |
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| ISSN: | 1420-3049 |