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Catalytic Upgrading of in Situ Coal Pyrolysis Tar over Ni-Char Catalyst with Different Additives
Alternative TitleEnergy Fuels
Han, Jiangze1,2; Liu, Xiaoxing1; Yue, Junrong1; Xi, Bingfeng1; Gao, Shiqiu1; Xu, Guangwen1
2014-08-01
Source PublicationENERGY & FUELS
ISSN0887-0624
Volume28Issue:8Pages:4934-4941
AbstractNi-char catalyst doped with different additives was used to catalytically upgrade coal pyrolysis tar in situ generated in a laboratory-scale dual-stage reactor. The additives including Fe, Mg, Ce, Zr were all beneficial to the catalytic activity for tar cracking. The best result of tar upgrading was achieved with Ce-Ni-char at a Ce-to-Ni molar ratio of 0.4. The upgrading test at 500 degrees C over a layer of such a catalyst (20% of the tested coal mass) increased the light tar (boiling point <360 degrees C) yield by 10.1%, and the light tar fraction in the tar product to 75 wt % from 52 wt %. The corresponding increase in the molar ratio of H to C of the tar was 61.796. About 60% of the pitch in the original tar from coal pyrolysis was cracked in the catalytic upgrading. The contents of element N and S in the tar after catalytic cracking decreased by 50.5% and 45.8%, respectively. NH3 temperature-programmed desorption results revealed that there were weak Lewis and strong Bronsted acidic sites on the Ni-char catalyst, but many more Lewis acidic sites existed on the Ce-Ni-char catalyst. The addition of Ce into Ni-char facilitated the dispersion of nickel and increased the ability of the catalyst for inhibiting coke deposition.; Ni-char catalyst doped with different additives was used to catalytically upgrade coal pyrolysis tar in situ generated in a laboratory-scale dual-stage reactor. The additives including Fe, Mg, Ce, Zr were all beneficial to the catalytic activity for tar cracking. The best result of tar upgrading was achieved with Ce-Ni-char at a Ce-to-Ni molar ratio of 0.4. The upgrading test at 500 degrees C over a layer of such a catalyst (20% of the tested coal mass) increased the light tar (boiling point <360 degrees C) yield by 10.1%, and the light tar fraction in the tar product to 75 wt % from 52 wt %. The corresponding increase in the molar ratio of H to C of the tar was 61.796. About 60% of the pitch in the original tar from coal pyrolysis was cracked in the catalytic upgrading. The contents of element N and S in the tar after catalytic cracking decreased by 50.5% and 45.8%, respectively. NH3 temperature-programmed desorption results revealed that there were weak Lewis and strong Bronsted acidic sites on the Ni-char catalyst, but many more Lewis acidic sites existed on the Ce-Ni-char catalyst. The addition of Ce into Ni-char facilitated the dispersion of nickel and increased the ability of the catalyst for inhibiting coke deposition.
KeywordVolatile Matter Synthesis Gas Brown-coal Biomass Gasification Hydrocracking Performance Pressure Reactor
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1021/ef500927d
URL查看原文
Indexed BySCI
Language英语
WOS KeywordVOLATILE MATTER ; SYNTHESIS GAS ; BROWN-COAL ; BIOMASS ; GASIFICATION ; HYDROCRACKING ; PERFORMANCE ; PRESSURE ; REACTOR
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000340808800011
Citation statistics
Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/11393
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Han, Jiangze,Liu, Xiaoxing,Yue, Junrong,et al. Catalytic Upgrading of in Situ Coal Pyrolysis Tar over Ni-Char Catalyst with Different Additives[J]. ENERGY & FUELS,2014,28(8):4934-4941.
APA Han, Jiangze,Liu, Xiaoxing,Yue, Junrong,Xi, Bingfeng,Gao, Shiqiu,&Xu, Guangwen.(2014).Catalytic Upgrading of in Situ Coal Pyrolysis Tar over Ni-Char Catalyst with Different Additives.ENERGY & FUELS,28(8),4934-4941.
MLA Han, Jiangze,et al."Catalytic Upgrading of in Situ Coal Pyrolysis Tar over Ni-Char Catalyst with Different Additives".ENERGY & FUELS 28.8(2014):4934-4941.
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