Formation behaviors of gas and liquid products during the two-stage hydrogasification of low-rank coal

Zhou, Jie; Wu, Xuantao; Qian, Yangyang; Wang, Jie

doi:10.1016/j.fuel.2015.02.037

Cited by 11 publications

(4 citation statements)

References 37 publications

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“…Hydropyrolysis/catalytic vapor hydrotreatment experiments were carried out in a two-stage fixed bed reactor. The apparatus configuration and the operating method were described elsewhere. , Briefly, a vertical Inconel-made reactor was heated by two independent electric furnaces. In each run, 1.0 g of a dried pine sawdust sample was precisely weighed and placed in the low part of the reactor for hydropyrolysis, and 5.0 g of the catalyst was tightly stacked in the upper part of the reactor for catalytic vapor hydrotreatment.…”

Section: Methodsmentioning

confidence: 99%

Catalytic Hydrotreatment of Pine Sawdust Hydropyrolysis Vapor over Ni, Mo-Impregnated HZSM-5 for Optimal Production of Gasoline Components

et al. 2021

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Noncatalytic hydropyrolysis of pine sawdust integrated with downstream catalytic vapor hydrotreating was conducted in a two-stage fixed bed reactor under 5 MPa H 2 . Among the catalysts used in the experiments (HZSM-5, 1%Mo-HZSM-5, 1%Ni-HZSM-5, and three NiMo-HZSM-5 catalysts of different metal loadings), bimetallic 1%Ni3%Mo-HZSM-5 acted as the best catalyst. The hydrotreatment with this catalyst at 320 °C converted the oxygenated bio-oil entirely into liquid hydrocarbons with a yield as high as 23.9% of dried biomass. Aliphatic hydrocarbons, mostly the gasoline naphthenic components, accounted for approximately 71.7% of the hydrotreated bio-oil, and the rest was mainly monoaromatic hydrocarbons and partially hydrogenated aromatics without oxygenates being detected. This catalyst also showed a much lower yield of coke than 1%Mo-HZSM-5. The hydrotreatment above 350 °C tended to favor the generation of alkane gases, accompanied by a dramatic decline in the bio-oil yield. Preliminary mechanistic studies suggested that Mo played a major role in promoting the formation of intermediates on the surface of the catalyst, while Ni facilitated the hydrogenation of the intermediates to liquid hydrocarbons or gaseous alkanes. There was a clear synergistic effect between Ni and Mo. Among the six catalysts, 1%Ni3%Mo-HZSM-5 had the most plentiful sites of weak and medium acids and the strongest hydrogenating effect on bio-oil. The synergistic effect was important for enhancing the production of liquid hydrocarbon fuels.

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Section: Methodsmentioning

confidence: 99%

Catalytic Hydrotreatment of Pine Sawdust Hydropyrolysis Vapor over Ni, Mo-Impregnated HZSM-5 for Optimal Production of Gasoline Components

et al. 2021

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“…Similar reactant conversion is permitted by the Pb-based membrane reactors. Contrary to normal SMR which operate at high temperature 850-900 C, the membrane reactors operate at a lower temperature of 450-550 C and produce methane conversions up to 90-95% [45].…”

Section: Methods Of Steam Reformingmentioning

confidence: 99%

“…Carbon control and sequestration, which is energy intensive stage is replaced by carbon control that could be employed in the chemical industries and metallurgy. Therefore, the processes of partial oxidation or steam conversion are higher than investments for big plants causing 25-30% hydrogen production cost [45]. The price of hydrogen would be less if markets are found for the extensive amounts of carbon resulting from the natural gas decomposition.…”

Section: Pyrolysis Of Hydrocarbonmentioning

confidence: 99%

Hydrogen Production from Light Hydrocarbons

Ibrahim¹

2018

Advances in Hydrogen Generation Technologies

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Recognizing and procurement of a sustainable energy system are among the supreme important problems that today's scientists should tackle. Interchanging the existing fossil fuels and transforming them into a sustainable fuel is one of the vital pieces in that system. Hydrogen as an energy carrier, obtained from light hydrocarbons, can take an essential role in the matters of sustainability, eco-friendly emissions, and energy saving. Our enthusiasm in stirring toward a hydrogen economy has its root in the vision of securing energy requirements at a satisfactory price, with larger competence and small environmental destruction associated with the utilization of traditional fuels. Hydrogen production pathways and relevant issues are discussed here. This chapter highlights the recent technological progress in the light hydrocarbons toward sustainable hydrogen production.

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“…Zhang et al [59] investigated the hydrogasification of low-rank coal in a two-stage fixed bed reactor, in which the hydrocracking zone is located in the upper part of the reactor while the particle samples of coke are placed in the lower zone. By changing the hydrocracking temperature, it is possible to modulate the CH 4 , CO, and CO 2 yield of the process.…”

Section: Process Layouts For the Hydrogasification Of Coal-derived Ma...mentioning

confidence: 99%

A Review of Coal and Biomass Hydrogasification: Process Layouts, Hydrogasifiers, and Catalysts

2023

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Despite the increasing need for chemicals and energy, the scenario in which fossil feedstocks can be completely replaced by renewables is currently unrealistic. Thus, the combination of biomass and non-renewable matrix-based (i.e., coal) technologies could provide a greener way toward the partial substitution of traditional fuels. The hydrogasification of carbonaceous feedstocks (coal and biomass) for the main production of CH4 offers a promising alternative to this end. However, hydrogasification has received very little attention, and the present review seeks to shed light on the process, reactor, and catalytic advances in the field. Independent of the selected matrices, various efforts have been devoted to the identification of efficient methods for the production of hydrogen feed to the gasifier and energy as well as the reduction in pollutant emissions from the plants. Moreover, the reactor configurations proposed are focused on the intensification of gas-solid contact to reduce by-product formation. The co-hydrogasification of both renewable and non-renewable feedstock is also reviewed, paying attention to the synergistic effect between the two matrices. In addition, due to the slow rates of hydrogasification reaction, the key role of catalysts and feedstock impurities on the reaction kinetics is discussed.

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Formation behaviors of gas and liquid products during the two-stage hydrogasification of low-rank coal

Cited by 11 publications

References 37 publications

Catalytic Hydrotreatment of Pine Sawdust Hydropyrolysis Vapor over Ni, Mo-Impregnated HZSM-5 for Optimal Production of Gasoline Components

Catalytic Hydrotreatment of Pine Sawdust Hydropyrolysis Vapor over Ni, Mo-Impregnated HZSM-5 for Optimal Production of Gasoline Components

Hydrogen Production from Light Hydrocarbons

A Review of Coal and Biomass Hydrogasification: Process Layouts, Hydrogasifiers, and Catalysts

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