id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
brj-23562	Yin, Dongxue; Chen, Dongdong; Qin, Jiajun; Wang, Baozhong; Liu, Wei; Wang, Yingxian	Progress of Biogas Upgrading Based on Citespace Visual Analysis	2024	13	.pdf	application/pdf	5534	246	48	On the basis of CiteSpace’s visual analysis of 1084 papers published in the field of biogas upgrading between 2009 and 2023, combined with the publication trend of biogas upgrading-related papers, the progress of biogas upgrading research is divided into three phases: 2009 to 2011 (Phase I) has relatively few research on biogas upgrading, but the research scope in this phase is broad, including the fields of biomethanation, variable pressure adsorption, and so on, laying a theoretical foundation for later biogas upgrading-related research; 2012 to 2015 (Phase II), during which the physical/chemical biogas upgrading technology matures and H2S removal reaches 100%; the papers published during 2016 to 2022 (Phase III) accounted for 73. The progress of biogas upgrading research is divided into three phases: 2009 to 2011 (Phase I), 2012 to 2015 (Phase II), and 2016 to 2022 (Phase III).	cache/brj-23562.pdf	txt/brj-23562.txt