Highly active and stable HF acid modified HZSM-5 supported Ni catalysts for steam reforming of toluene and biomass pyrolysis tar

Tang, Wen; Cao, Jing‐Pei; Yang, Fenghuan; Feng, Xiaobo; Ren, Jie; Wang, Jing-Xian; Zhao, Xiao-Yan; Zhao, Ming; Cui, Xin; Wei, Xian‐Yong

doi:10.1016/j.enconman.2020.112799

Cited by 60 publications

(14 citation statements)

References 72 publications

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“…As an important member in the heterogeneous catalyst system, zeolite can also be used as a good support modification with Ni to investigate the performance in biomass gasification and oil reforming. It is welcomed by researchers because of the high hydrothermal stability, excellent anti-coke ability, and easy regeneration. , …”

Section: Catalystsmentioning

confidence: 99%

Catalytic Conversion of Coal and Biomass Volatiles: A Review

et al. 2020

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This paper presents a review of recent research on direct upgrading of coal/biomass volatiles into aromatics by catalytic pyrolysis and syngas by gasification with catalytic steam reforming. Coal/biomass valorization is considered an important part to fill up the depletion of modern fossil fuel resources. The catalytic pyrolysis process is a potential approach to improve coal tar/bio-oil quality by minimizing its undesirable properties (high viscosity, corrosivity, instability, etc.) and producing renewable fuels and high-value chemicals, such as aromatics (benzene, toluene, ethylbenzene, xylenes, etc.). Gasification reforming as a promising process for renewable energy utilization can produce H2-rich syngas. The produced syngas can be further synthesized to fuel and chemicals via Fischer–Tropsch synthesis. Thus, this study provides a comprehensive review of the research and development of conversion of coal and biomass volatiles in terms of technological types and catalysts. Aspects related to upgrading technology, the reactor type of catalytic pyrolysis and gasification, and the reaction mechanisms to specific products during the catalytic process are also discussed comprehensively. In particular, catalytic upgrading by fast pyrolysis involves a series of reactions, including deoxygenation, cracking, hydrocarbon pool mechanism, aromatization, and condensation, as well as desulfurization and denitrification in the gasification process. Some key points that are to be addressed for the established process of coal and biomass volatile upgrading may include finding multifunctional catalysts and reactor development for improving the efficiency. Expanding and enhancing knowledge about catalyst utilization and fundamental reaction mechanisms in the thermochemical catalytic conversion technologies of coal and biomass will play an important role in the generation of chemicals and carbon-neutral fuels.

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Section: Catalystsmentioning

confidence: 99%

Catalytic Conversion of Coal and Biomass Volatiles: A Review

et al. 2020

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“…Metallic Ni supported on various supports ( e . g ., CeO 2 , Al 2 O 3 , and zeolite) has already been proved to be active in tar reforming and methanation. − For instance, Ni/Al 2 O 3 was reported to be easily deactivated in biomass tar reforming because of carbon deposition during long-term testing. , CeO 2 possessed a great capacity of oxygen storage through the transformation of Ce 4+ and Ce 3+ , and therefore, it exhibited certain coke resistance during tar reforming. , Zeolite with a superb structure and activity in suppressing carbon deposition is widely employed for Ni-based catalyst preparation and biomass tar cracking . Regarding Ni-based catalysts in methanation, Ni/CeO 2 , Ni/Al 2 O 3 , and Ni/ZrO 2 , and other Ni-based catalysts derived from hydrotalcites and perovskites have been employed for CO/CO 2 methanation, − and their excellent structures, like tailored basic sites, tailored oxygen defects, and Ni dispersion, can obviously enhance methane production. , As an emerging material, char ( i .…”

Section: Introductionmentioning

confidence: 99%

Direct Conversion of Syngas Produced from Steam Reforming of Toluene into Methane over a Ni/Biochar Catalyst

Ren

Liu

2021

ACS Sustainable Chem. Eng.

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In the presence of a catalyst, the reforming of biomass tar to produce syngas, and its further use for chemical production, is a sustainable energy technology. However, to the best of our knowledge, the integration of tar reforming and downstream technology is still limited. In this work, an economical Ni/biochar catalyst was prepared and successfully applied for steam reforming of toluene (as a tar model compound) and syngas methanation. Under experimental conditions, the Ni/wheat straw (Ni/WS) char catalyst is active for syngas production and further for methane production in a wide temperature range. The physicochemical properties of the Ni/WS char catalyst were carefully characterized, and then the activity, stability, and deactivation of Ni/WS char in toluene reforming and methanation were elaborated. Ni/WS char possessed a smaller Ni crystallite size, and its lower activation energy resulted in higher toluene conversion (90.2%) and gas yield (261.4 mmol/gtoluene) compared with the commercial Ni/Al2O3 catalyst during toluene reforming. Furthermore, the produced syngas with an optimized H2/CO ratio of 3.01 was proved to be suitable for methane production over Ni/WS char, which therefore showed a high CO conversion (80.3%).

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“…To ensure the accuracy of the kinetic parameters for SRT over the Ni/MgAl catalysts, the toluene conversion was controlled at <20% by decreasing the gas flow rate and catalyst amount. The apparent activation energies (E a ) were calculated from the transform of the Arrhenius equation (k = Ae −Ea/RT , where k can be replaced by TOF), 9,47,56 where the slope of the equation ln k = −E a /RT + ln A represents the E a of the reaction. The Arrhenius plots and TOF values of different Ni/ 4,9,57,58 indicating the superior catalytic performance of the prepared Ni/MgAl catalysts in SRT.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Enhanced H₂-Rich Gas Production via Steam Reforming of Toluene over Ni-Based Hydrotalcite-Derived Catalysts at Low Temperature

Ren

Yang

Liu

2021

ACS Sustainable Chem. Eng.

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Tar reforming in the presence of Ni-based catalysts is a promising method for syngas production during biomass gasification, but common Ni-based catalysts (e.g., Ni/Al 2 O 3 ) are easily deactivated during actual operation. In this work, Mg−Al hydrotalcite was synthesized by coprecipitation, followed by Ni impregnation and calcination, to obtain a Ni/MgAl catalyst, which exhibited excellent activity and stability for toluene (as a tar model compound) conversion. After various types of characterization and experimental investigations, the reaction and deactivation pathways were explained. The optimized Ni/MgAl-10 catalyst with better Ni dispersion, tailored basicity, and specific surface area showed remarkable toluene conversion (98.5%) and H 2 production (609 mmol/g-Ni) at a low temperature. On the basis of calculations of the apparent activation energy and turnover frequency (TOF), Ni/ MgAl-10, with the lowest activation energy (25.6 kJ/mol) and highest TOF value (4.31 h −1 ), was found to be the most active catalyst for H 2 -rich gas production. Moreover, the spent catalyst was systemically characterized by SEM and XPS, and mechanisms of reaction and deactivation were proposed. This work developed a strategy for the design of an active and stable catalyst for toluene reforming, which has potential for application in the reforming of real tar during biomass gasification.

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Highly active and stable HF acid modified HZSM-5 supported Ni catalysts for steam reforming of toluene and biomass pyrolysis tar

Cited by 60 publications

References 72 publications

Catalytic Conversion of Coal and Biomass Volatiles: A Review

Catalytic Conversion of Coal and Biomass Volatiles: A Review

Direct Conversion of Syngas Produced from Steam Reforming of Toluene into Methane over a Ni/Biochar Catalyst

Enhanced H₂-Rich Gas Production via Steam Reforming of Toluene over Ni-Based Hydrotalcite-Derived Catalysts at Low Temperature

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Highly active and stable HF acid modified HZSM-5 supported Ni catalysts for steam reforming of toluene and biomass pyrolysis tar

Cited by 60 publications

References 72 publications

Catalytic Conversion of Coal and Biomass Volatiles: A Review

Catalytic Conversion of Coal and Biomass Volatiles: A Review

Direct Conversion of Syngas Produced from Steam Reforming of Toluene into Methane over a Ni/Biochar Catalyst

Enhanced H2-Rich Gas Production via Steam Reforming of Toluene over Ni-Based Hydrotalcite-Derived Catalysts at Low Temperature

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Product

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Enhanced H₂-Rich Gas Production via Steam Reforming of Toluene over Ni-Based Hydrotalcite-Derived Catalysts at Low Temperature