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- Wang, Shule, 1994-, et al.
(författare)
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Novel carbon-negative methane production via integrating anaerobic digestion and pyrolysis of organic fraction of municipal solid waste
- 2021
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The use of bioenergy with carbon capture and storage (BECCS) is vital to reaching the desired climate goals. This study proposed a novel process combining anaerobic digestion, pyrolysis, catalytic reforming and methanation (APRM) to produce biomethane and to capture carbon emission from the organic fraction of municipal solid waste (OFMSW). The evaluation of the process was conducted by using modelling software and techno-economic analysis. The process modelling and evaluation result showed that 151.4 kg CH4 and 355.64 kg stored carbon emission can be produced from 1 ton dry matter of OFMSW with an energy efficiency of 0.40. 6.74 MJ electricity was required to capture 1 kg of CO2 via the proposed process. The energy balance of the pyrolysis reaction was investigated. The sensitivities of the pyrolysis temperatures, dewatering technologies and conversion of catalytic reforming on the process performance were analyzed. The result also indicated a positive net profit when using the APRM process to treat the OFMSW based on the calculation of operating expenses and revenue, when the CO2 negativity can be sold as commodity.
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- Yang, Hanmin, 1992-, et al.
(författare)
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Syngas production from biomass pyrolysis followed by in-line biochar-catalytic reforming : the effect of space velocity, particle size, and morphology
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- A syngas production based on a biomass pyrolysis followed by an in-line catalytic reforming process is a promising method to help curb greenhouse gas emissions. The use of biochar as the reforming catalyst is economically and technologically attractive. A continuous pyrolysis combined with an in-line biochar-catalytic reforming of the pyrolysis vapor was investigated in a comprehensive system consisting of an auger reactor and a downstream fixed-bed rector. The effect of the weight hourly space velocity (WHSV), particle size and morphology of biochar, and the pressure drop of the biochar bed on the catalytic performance were discussed. The results indicated that a higher syngas yield with a higher H2+CO proportion was obtained when using a lower WHSV, due to a longer residence time. The highest syngas and H2 yields were obtained when using biochar with the smallest particles sizes (0.6-1 mm), i.e. the highest bed pressure drops. The use of biochar particles, which are more spherical and rounded, resulted in higher syngas yields, H2 +CO proportions, and H2 yields due to the enhanced heat and mass transfer favored by the rounded shape. Up to 12 mmol H2/g-biomass was obtained, corresponding to a dry gas yield of 0.68 Nm3/kg , containing 39 vol. % H2 and 27 vol. % CO. The use of biochar as a reforming catalyst showed a relatively stable catalytic performance after during a 100-minutes of running the experimentexperimental run-time.
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- Yu, Guimei, et al.
(författare)
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Structure of SOQ1 lumenal domains identifies potential disulfide exchange for negative regulation of photoprotection, qH
- 2024
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Non-photochemical quenching (NPQ) plays an important role for phototrophs in decreasing photo-oxidative damage. qH is a sustained component of NPQ and depends on the plastid lipocalin (LCNP). A thylakoid membrane-anchored protein SUPPRESSOR OF QUENCHING1 (SOQ1) prevents qH formation by inhibiting LCNP. SOQ1 suppresses qH with its lumen-located C-terminal Trx-like and NHL domains. Here we report crystal structures and biochemical characterization of SOQ1 lumenal domains. Our results show that the Trx-like and NHL domains are stably associated, with the potential redox-active motif located at their interface. Residue E859 essential for SOQ1 function is pivotal for mediating the inter-domain interaction. Moreover, the C-terminal region of SOQ1 forms an independent β-stranded domain, which possibly interacts with the Trx-like domain through disulfide exchange. Furthermore, SOQ1 is susceptible to cleavage at the loops connecting the neighboring domains both in vitro and in vivo, which could be a regulatory process for its suppression function of qH.
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