Applications of Biochar for Environmental Safety最新文献

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Biochar-Assisted Wastewater Treatment and Waste Valorization 生物炭辅助废水处理及废物增值
Applications of Biochar for Environmental Safety Pub Date : 2020-04-30 DOI: 10.5772/intechopen.92288
A. Bishnu, A. Pohkeral, A. Farooque
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引用次数: 9
Mechanism of In-Situ Catalytic Cracking of Biomass Tar over Biochar with Multiple Active Sites 多活性位点生物炭原位催化裂解生物质焦油机理研究
Applications of Biochar for Environmental Safety Pub Date : 2020-02-21 DOI: 10.5772/intechopen.91380
D. Feng, Yu Zhang, Yijun Zhao, Shaozeng Sun
{"title":"Mechanism of In-Situ Catalytic Cracking of Biomass Tar over Biochar with Multiple Active Sites","authors":"D. Feng, Yu Zhang, Yijun Zhao, Shaozeng Sun","doi":"10.5772/intechopen.91380","DOIUrl":"https://doi.org/10.5772/intechopen.91380","url":null,"abstract":"Biomass tar is the bottleneck in the development of efficient utilization of biomass syngas. The in-situ catalytic cracking biomass tar with multi-active biochar is investigated in a two-stage fluidized bed-fixed bed reactor. It indicates that adding H 2 O or CO 2 is found to improve the homogeneous and heterogeneous cracking of biomass tar. Activation of biochar by H 2 O or CO 2 impacted the morphology of biochar surface and distribution of metal species. H 2 O or CO 2 affects the creation and regeneration of pore structures, influencing the biochar structure and dynami-cal distribution of alkali and alkaline earth metal species (AAEMs), which ensure enough surface active sites to maintain the catalytic activity of biochar. The tar cracking into low-quality tar or small-molecule gas may be catalyzed by K, while the combination of tar with biochar would be promoted by Ca. The volatilizations of K and Ca, due to their reaction with volatiles, are to a large extent in accordance with their valences and boiling points. The subsequent transformation from the small aromatic ring systems to the larger ones occurs due to the volatile-biochar interaction. During tar cracking over biochar, K and Ca act as the active sites on biochar surface to promote the increase of active intermediates (C ▬ O bonds and C ▬ O ▬ K/Ca).","PeriodicalId":423830,"journal":{"name":"Applications of Biochar for Environmental Safety","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121689624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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