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Tytuł pozycji:

The synergistic mechanism between coke depositions and gas for H 2 production from co-pyrolysis of biomass and plastic wastes via char supported catalyst.

Tytuł :
The synergistic mechanism between coke depositions and gas for H 2 production from co-pyrolysis of biomass and plastic wastes via char supported catalyst.
Autorzy :
Xu D; Key Laborator y of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China.
Xiong Y; Key Laborator y of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China. Electronic address: .
Zhang S; Key Laborator y of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China; School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. Electronic address: .
Su Y; Key Laborator y of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China.
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Źródło :
Waste management (New York, N.Y.) [Waste Manag] 2021 Feb 15; Vol. 121, pp. 23-32. Date of Electronic Publication: 2020 Dec 17.
Typ publikacji :
Journal Article
Język :
English
Imprint Name(s) :
Original Publication: New York : Pergamon Press, c1989-
MeSH Terms :
Coke*
Nanotubes, Carbon*
Biomass ; Catalysis ; Plastics ; Pyrolysis
Contributed Indexing :
Keywords: Biomass; Co-pyrolysis; Coke; Gas; Plastic; Synergistic mechanism
Substance Nomenclature :
0 (Coke)
0 (Nanotubes, Carbon)
0 (Plastics)
Entry Date(s) :
Date Created: 20201220 Date Completed: 20210202 Latest Revision: 20210202
Update Code :
20210210
DOI :
10.1016/j.wasman.2020.11.044
PMID :
33341691
Czasopismo naukowe
Co-pyrolysis of biomass and polyethylene(PE) wastes with different blending ratios were performed in a bench-scale fixed bed over Ni/char catalyst. The synergistic mechanism between coke depositions and gas products during co-pyrolysis was studied for better regulation of H 2 production. The results showed that feedstock blending ratio played a decisive role in competitive growth of amorphous coke and multi-walled carbon nanotubes (CNTs) on the catalyst surface. For low PE ratio (≤50 wt%) a negative synergy on H 2 yield was generated. It was ascribed to more oxygenates that were more inclined than hydrocarbons to be absorbed by porous char to form amorphous coke, which encapsulated Ni active sites and internal pore channel of catalyst, thus resulting in deactivation of catalyst. For higher PE content, Ni/char catalyst produced more than triple the amounts of H 2 yield (42.28 mmol/g feedstock ) as compared to low PE ratio (11.3 mmol/g feedstock ). A maximum positive synergy on syngas quality was yielded at 75% PE. Despite the high yield (37.8 wt%) of deposited coke, more hydrocarbon gas from plastic pyrolysis condensed on catalyst and promoted CNTs growth via dehydrogenation and polymerization, simultaneously generating H 2 . The unique hollow tubular structure and tip-growth mode of CNTs exposed more Ni active sites and endowed catalyst with lower deactivation extent. The scission of more chain hydrocarbons was subsequently enhanced to interact with oxygenated compounds. Therefore, appropriate PE ratios (>50%) can exert a positive synergy on gaseous conversion by regulating coke nature during co-pyrolysis of biomass and plastics. Furthermore, coke structure rather than content seems to exert more significant effect.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)

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