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题名: Preparation of Superhighly Dispersed Co3O4@SBA-15 with Different Morphologies in Supercritical CO2 with the Assistance of Dilute Acids
作者: Xu, Qin-Qin1;  Xu, Gang1;  Yin, Jian-Zhong1;  Wang, Ai-Qin2;  Ma, Yu-Ling1;  Gao, Jin-Ji1
刊名: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
发表日期: 2014-06-25
DOI: 10.1021/ie501241f
卷: 53, 期:25, 页:10366-10371
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: In previous reports, organic solvents have usually been used as cosolvents in supercritical fluid applications. In this study, dilute acids were introduced into supercritical CO2 as cosolvents for the first time to improve the adsorption and dispersion of metal precursors on the substrate. Superhighly dispersed Co3O4 nanoparticles were confined in the nanochannels of SBA-15 after deposition and calcination when a small amount of nitric acid was added as the cosolvent. As the concentration of nitric acid increased, more individual small nanoparticles aggregated in adjacent nanochannels through the micropores in the walls of the substrates, which favored the formation of large nanoparticles. Furthermore, only Co3O4 nanoparticles were obtained when nitric acid was added to supercritical CO2-ethanol solution, whereas nanowires were found instead when hydrochloric acid was used. This indicates that H+ favors the adsorption and dispersion of precursors on the substrates and Cl- plays a key role in dictating the nanowire morphology.
关键词[WOS]: SBA-15 ;  COMBUSTION ;  OXIDATION ;  CATALYSTS ;  SILICAS ;  CO3O4
语种: 英语
WOS记录号: WOS:000338183800013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143216
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Univ Technol, State Key Lab Fine Chem, Sch Chem Machinery, Dalian 116024, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Xu, Qin-Qin,Xu, Gang,Yin, Jian-Zhong,et al. Preparation of Superhighly Dispersed Co3O4@SBA-15 with Different Morphologies in Supercritical CO2 with the Assistance of Dilute Acids[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,2014,53(25):10366-10371.
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