New CoO-SiO2-Sol Pillared Clays as Catalysts for NOx Conversion
详细信息 查看全文
- 作者：Jin-Ho Choy ; Hyun Jung ; Yang-Su Han ; Joo-Byoung Yoon ; Yong-Gun Shul ; and Hyun-Jong Kim
- 刊名：Chemistry of Materials
- 出版年：2002
- 出版时间：September 2002
- 年：2002
- 卷：14
- 期：9
- 页码：3823 - 3828
- 全文大小：116K
- 年卷期：v.14,no.9(September 2002)
- ISSN：1520-5002
文摘
New CoO-SiO2-sol pillared montmorillonite (Co-SiM) is synthesized by interlamellarhydrolysis and condensation of tetraethyl orthosilicate (TEOS) in the presence of Co2+ ionvia an alkylammonium intercalated montmorillonite. The silicate layers of Na+-montmorillonite are expanded in advance with hexadecyltrimethylammonium cation up to ~22 Å,followed by reaction with a mixed sol solution of TEOS and CoCl2·6H2O in the presence ofn-dodecylamine as a cotemplate. A microporous Co-SiM is obtained after removing theorganic templates at 550 
C. The nitrogen adsorption-desorption isotherm for the pillaredsample reveals that a large number of micropores are created between the silicate layers,giving rise to a high BET specific surface area (SBET = ~570 m2/g) and a pore volume (V =~0.65 mL/g). According to the X-ray photoelectron and X-ray absorption spectroscopy, theincorporated cobalt species is found to be CoO, which is homogeneously dispersed on thesurface of the SiO2 pillars. The Co-SiM exhibits an excellent NO conversion rate of ca. 50%at 200 C, which continuously increases up to 80% at 500 C.
C. The nitrogen adsorption-desorption isotherm for the pillaredsample reveals that a large number of micropores are created between the silicate layers,giving rise to a high BET specific surface area (SBET = ~570 m2/g) and a pore volume (V =~0.65 mL/g). According to the X-ray photoelectron and X-ray absorption spectroscopy, theincorporated cobalt species is found to be CoO, which is homogeneously dispersed on thesurface of the SiO2 pillars. The Co-SiM exhibits an excellent NO conversion rate of ca. 50%at 200 C, which continuously increases up to 80% at 500 C.