Conversion of lignite-derived volatiles into aromatics over Zn@MCM-41 and ZSM-5 tandem catalysts with a high stability

Zhao, Xiao-Yan; Ren, Xue-Yu; Wang, Yanjun; Cao, Jing‐Pei; He, Zi-Meng; Yao, Nai-Yu; Bai, Hongcun; Cong, Hou-Luo

doi:10.1016/j.fuel.2023.127430

Cited by 6 publications

(4 citation statements)

References 47 publications

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“…The abundance of the hydrogen radicals led to the hydrogenation of nonsaturated bonds. In the next stage, nonstabilized organic radicals reacted with each other to form longer chains and might further polymerize to form coke. − During these stages, some other reactions, such as ketonization and aldol condensation occurred. Depending on the content of nitrogen and sulfur in the biomass, other reactions such as hydrodenitrogenation and hydrodesulfurization could also take place .…”

Section: Comparison Of the Biofuel Properties Costs And Environmental...mentioning

confidence: 99%

Advances and Perspectives of Bio-oil Hydrotreatment for Biofuel Production

et al. 2023

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Bio-oil is a liquid product produced from the pyrolysis of renewable biomass, and the potential application of bio-oil as liquid fuel attracts great interest. However, bio-oil has to be upgraded via processes like hydrodeoxygenation to remove the abundance of oxygen that makes bio-oil high acidity, low stability, low heating value, etc. Up to now, numerous efforts have been devoted to upgrading bio-oil through development of catalysts, reactors, processes, etc. One of the key criteria for assessing the feasibility of the previous trials is the specification of biofuel generated. Hence, this review mainly discusses the features of biofuels produced from different biomass feedstocks. The aim was to try to understand the nature of the biofuel from varied biomass feedstocks (i.e., woody biomass, grass, algae, etc.) and the associated issues in the hydrotreatment process. The environmental impact and economic analysis of the production of biofuel from different types of biomass are also discussed.

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Section: Comparison Of the Biofuel Properties Costs And Environmental...mentioning

confidence: 99%

Advances and Perspectives of Bio-oil Hydrotreatment for Biofuel Production

et al. 2023

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“…The required reagents were supplied by Sinopharm Chemical Reagent Co., Ltd. (Beijing, China). The KCC-1 [33] and MCM-41 [34] supports were prepared according to previously reported procedures.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Insights into SnO2 Nanoparticles Supported on Fibrous Mesoporous Silica for CO Catalytic Oxidation

Zhang

Yan

et al. 2023

Catalysts

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A large surface area dendritic mesoporous silica material (KCC-1) was successfully synthesized and used as a support to confine SnO2 nanoparticles (NPs). Owing to the large specific surface area and abundant mesoporous structure of dendritic KCC-1, the SnO2 NPs were highly dispersed, resulting in significantly improved CO catalytic oxidation activity. The obtained Snx/KCC-1 catalysts (x represents the mass fraction of SnO2 loading) exhibited excellent CO catalytic activity, with the Sn7@KCC-1 catalyst achieving 90% CO conversion at about 175 °C. The SnO2 NPs on the KCC-1 surface in a highly dispersed amorphous form, as well as the excellent interaction between SnO2 NPs and KCC-1, positively contributed to the catalytic removal process of CO on the catalyst surface. The CO catalytic removal pathway was established through a combination of in situ diffuse reflectance infrared transform spectroscopy and density-functional theory calculations, revealing the sequential steps: ① CO → CO32−ads, ② CO32−ads → CO2free+SnOx−1, ③ SnOx−1+O2 → SnOx+1. This study provides valuable insights into the design of high-efficiency non-precious metal catalysts for CO catalytic oxidation catalysts with high efficiency.

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“…Clean coal technology, particularly pyrolysis, has received worldwide attention as a platform because of the inexpensive routes to efficiently convert solid carbon into pyrolysis-based products being tar-rich in condensable valuable chemicals as well as solid carbon materials (char) and non-condensable gas, which are particularly suitable for low-rank coal with high volatiles. − Products from direct pyrolysis, however, have the drawbacks of high instability, complex composition, low selectivity of valuable compounds, etc. , Catalytic upgrading has been successfully used for the conversion of pyrolytic volatiles into value-added chemicals and/or fuels. ,, Zeolite-based catalysts have been extensively studied in pyrolysis as a result of their high-temperature resistance, stable physical properties, unique pore structure, large specific surface area, and abundant acidic centers. − In particular, HZSM-5 (HZ5) exhibits unparalleled selectivity for light aromatics (LAs) and is considered as the ideal catalyst for the preparation of LAs. For example, Wei et al investigated the catalytic upgrading of pyrolytic volatiles from sewage sludge.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Upgrading of Lignite Pyrolysis Volatiles to Aromatics over Urea-Modified HZSM-5: Study on Desilication of Preserved Micropores

Zhao

Cao

et al. 2023

Energy Fuels

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This work aimed to investigate the effect of the physical properties of urea-desilicated HZSM-5 on the catalytic performance of the lignite pyrolysis volatiles upgrading to aromatics. A mild urea treatment can create more secondary mesoporous and Brønsted acid sites while well-preserving micropores, of which the first two promoted the diffusion and active cleavage of macromolecules into more small fragments, while the latter ensured the shape selectivity to form aromatics. Consequently, the urea-desilicated catalysts exhibited better performance for the production of aromatics, especially benzene and toluene in monocyclic aromatic hydrocarbons (MAHs), compared to the parent HZSM-5. Among the catalysts, HZSM-5 treated with 5 wt % urea solution for 5 h gave the highest light aromatic (LA) yield of 25.8 mg/g, in which the increased MAH yield accounted for 77% of the total increased LAs. However, excessive desilication with a higher urea concentration or longer treatment time significantly reduced the aromatic yield as a result of a considerable loss of micropores and mesoporous and Brønsted acid sites. The strategy of preserving micropores and optimizing mesoporous and Brønsted acid sites provides a new way to enhance the formation of aromatics.

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Conversion of lignite-derived volatiles into aromatics over Zn@MCM-41 and ZSM-5 tandem catalysts with a high stability

Cited by 6 publications

References 47 publications

Advances and Perspectives of Bio-oil Hydrotreatment for Biofuel Production

Advances and Perspectives of Bio-oil Hydrotreatment for Biofuel Production

Insights into SnO2 Nanoparticles Supported on Fibrous Mesoporous Silica for CO Catalytic Oxidation

Catalytic Upgrading of Lignite Pyrolysis Volatiles to Aromatics over Urea-Modified HZSM-5: Study on Desilication of Preserved Micropores

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