Journal
WASTE MANAGEMENT
Volume 147, Issue -, Pages 1-9Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2022.05.007
Keywords
Biomass tar; Naphthalene; Ni-modified ZSM-5; Catalytic steam reforming; Hydrothermal
Categories
Funding
- National Natural Science Foundation of China [21976011, 22006075]
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In this study, Ni-modified ZSM-5 catalysts were prepared using a one-pot hydrothermal synthesis method and used for steam reforming of naphthalene. The effects of reaction temperature, silica-alumina ratio, and metal content on the catalytic performance were investigated. It was found that an appropriate metal content contributes to the catalyst's performance.
Ni-modified ZSM-5 catalysts are prepared by a one-pot hydrothermal synthesis method and applied to the steam reforming of naphthalene as a tar model compound. The effects of the reaction temperature, silica-alumina ratio (Si/Al) and metal content on the catalytic performance for reforming naphthalene are investigated. Characterization results indicate that the Ni-modified ZSM-5 catalysts maintain the original MFI structure of ZSM-5 and a portion of Ni is successfully introduced into the zeolite structure. When the reaction temperature is 800 degrees C, the conversion efficiency of naphthalene achieves 91.5% with a high yield (6.75%) of hydrogen. Zeolite catalysts with higher Si/Al ratios improve the conversion of naphthalene to syngas, demonstrating their better catalytic activity. An appropriate active metal content (2.4 wt%) contributes to the catalytic performance of the catalyst owing to the strong metal-support interaction, resulting in resistance to sintering and carbon deposition. The reaction mechanism involved in the catalytic reforming of naphthalene is proposed. The application of a novel one-pot hydrothermal synthesis method greatly promoted the catalytic activity of Ni@ZSM-5, which provided an appropriate and universal approach for the improvement and optimization of tar reforming catalysts.
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