Hydrogen production from microwave catalytic pyrolysis of spruce sawdust

Leštinský, Pavel; Grycová, Barbora; Pryszcz, Adrian; Martaus, Alexandr; Matějová, Lenka

doi:10.1016/j.jaap.2017.02.008

Cited by 44 publications

(5 citation statements)

References 18 publications

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“…Then, the content of hydrogen in process gas gradually decreased due to catalyst deactivation. Initial increase of the catalyst activity can be explained by gradual reduction of nickel oxide to the more active metallic nickel [23]. The presence of coke on the spent catalyst surface was confirmed both visually by the catalyst color change as well as by the change of its mass as given in Table 4.…”

Section: Model Tar Component Decomposition Experimentsmentioning

confidence: 79%

Performance of Catalysts of Different Nature in Model Tar Component Decomposition

et al. 2019

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Municipal solid waste constitutes one of the major challenges and concerns of our society. Disposal of waste material is potentially dangerous, harming both environment and mankind. In order to diminish negative effects of municipal solid waste, its thermal decomposition to valuable chemicals has been studied. The principal draw-back of thermal processes used for solid waste utilization as raw material is tar formation. In this study, low-cost catalysts of different origin were tested in the decomposition of a model component of tar originating from waste material pyrolysis/gasification. p-Xylene was selected as the model compound found in biomass decomposition products. Its decomposition was carried out in the presence of either tire pyrolysis char- or clay minerals-based catalysts. Tar-cracking activities of both catalyst types at varying experimental conditions were compared and related to the catalysts physical-chemical properties. In experiments, either empty reactor or reactor filled with 10 g of the catalyst was used; p-xylene mass flow was set to 2.58 g h−1 (50 μL min−1, room temperature), and decomposition temperature ranging from 750 °C to 850 °C was applied. Moreover, evolution of the output variables, p-xylene conversion and hydrogen content in the gas phase, with the reaction time was investigated. Catalysts’ properties were assessed based on nitrogen adsorption isotherms, thermogravimetric and elemental composition analyses. Amounts and composition of p-xylene catalytic decomposition products were evaluated using GC analysis of both gaseous phase and condensable products. Results showed the superiority of tire pyrolysis char catalyst over that based on clay minerals.

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Section: Model Tar Component Decomposition Experimentsmentioning

confidence: 79%

Performance of Catalysts of Different Nature in Model Tar Component Decomposition

et al. 2019

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“…32 In other words, it is the pseudo-catalytic effect of microwave heating. 33,34 It is worthwhile noting that the tar conversion efficiency reached up to 97.3% at 700 C and was only slightly increased as the temperature increasing to 800 C, for the Ni/ RHC-4 catalyst under microwave condition. The tar conversion efficiency at 700 C under microwave condition was even higher than that at 800 C under conventional condition, also indicating that microwave heating was more effective on heterogeneous catalytic reactions.…”

Section: Tar Conversionmentioning

confidence: 96%

Biomass tar cracking and syngas production using rice husk char-supported nickel catalysts coupled with microwave heating

Dong

Zhang

et al. 2018

RSC Adv.

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In the present work, biomass pyrolysis tar cracking and reforming for high quality syngas production using a rice husk char (RHC)-supported nickel catalyst (Ni/RHC) coupled with microwave heating was investigated. The Ni/RHC catalyst exhibited a high catalytic performance on tar removal and contributed well to the production of CO and H 2 . The conversion efficiency could reach up to 97.3%, and the CO and H 2 yields were 274.0 ml g À1 and 248.9 ml g À1 , respectively, at 700 C, under microwave conditions, when the nickel loading amount was 10.42 wt% of the support. The tar conversion efficiencies and syngas yields significantly increased as the cracking temperatures increased from 500 C to 700 C and the nickel loading amount increased from 0 to 10.42 wt%. The Ni/RHC catalysts became more effective for tar removal and the production of syngas increased under microwave conditions compared to the results obtained under conventional conditions.

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“…The enhancement of hydrogen production from biomass was also reported by Yao et al, 8 who concluded that the addition of Ni on the char support results in a higher H 2 yield than using pure char in biomass gasification. Lestinsky et al 34 also showed that the addition of active catalytic elements such as Ni to the char has a strong effect on hydrogen production in the microwave catalytic pyrolysis of spruce sawdust. This is due to its great catalytic ability with respect to the cracking and reforming of heavy volatile compounds.…”

Section: Effect Of Ni-doped Biochar On Pyrolysis Product Distribution...mentioning

confidence: 99%

Evaluation of Engineered Biochar-Based Catalysts for Syngas Production in a Biomass Pyrolysis and Catalytic Reforming Process

et al. 2023

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Biochar, originating from biomass pyrolysis, has been proven a promising catalyst for tar cracking/reforming with great coke resistance. This work aims to evaluate various engineered biochar-based catalysts on syngas production in a biomass pyrolysis and catalytic reforming process without feeding extra steam. The tested engineered biochar catalysts include physical-and chemical-activated, nitrogen-doped, and nickel-doped biochars. The results illustrated that the syngas yields were comparable when using biochar and activated biochar as catalysts. A relatively high specific surface area (SSA) and a hierarchical porous structure are beneficial for syngas and hydrogen production. A 2 h physical-activated biochar catalyst induced the syngas with the highest H 2 /CO ratio (1.5). The use of N-doped biochar decreased the syngas yield sharply due to the collapse of the pore structure but obtained syngas with the highest LHV gas (18.5MJ/Nm 3 ). The use of Ni-doped biochar facilitated high syngas and hydrogen yields (78.2 wt % and 26 mmol H 2 /g-biomass) and improved gas energy conversion efficiency (73%). Its stability and durability test showed a slight decrease in performance after a three-time repetitive use. A future experiment with a longer time is suggested to determine when the catalyst will finally deactivate and how to reduce the catalyst deterioration.

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Hydrogen production from microwave catalytic pyrolysis of spruce sawdust

Cited by 44 publications

References 18 publications

Performance of Catalysts of Different Nature in Model Tar Component Decomposition

Performance of Catalysts of Different Nature in Model Tar Component Decomposition

Biomass tar cracking and syngas production using rice husk char-supported nickel catalysts coupled with microwave heating

Evaluation of Engineered Biochar-Based Catalysts for Syngas Production in a Biomass Pyrolysis and Catalytic Reforming Process

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