title: Effects of synthesis methods on catalytic activities of CoOx-TiO2for low-temperature NH3-SCR of NO.
abstract: A series of cobalt doped TiO2(Co-TiO2) and CoOxloaded TiO2(Co/TiO2) catalysts prepared by sol-gel and impregnation methods respectively were investigated on selective catalytic reduction with NH3(NH3-SCR) of NO. It was found that Co-TiO2catalyst showed more preferable catalytic activity at low temperature range. From characterization results of XRD, TEM, Raman and FT-IR, Co species were proved to be doped into TiO2lattice by replaced Ti atoms. After being characterized and analyzed by NH3-TPD, PL, XPS, EPR and DRIFTS, it was found that the better NH3-SCR activities of Co-TiO2catalysts, compared with Co/TiO2catalyst, were ascribed to the formation of more oxygen vacancies which further promoted the production of more superoxide ions (O2-). The superoxide ions were crucial for the formation of low temperature SCR reaction intermediates (NO3-) by reacting with adsorbed NO molecule. Therefore, these aspects were responsible for the higher low temperature NH3-SCR activity of Co-TiO2catalysts.
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
authors.forename: Li
authors.initials: L
authors.lastname: Zhu
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
authors.forename: Yiqing
authors.initials: Y
authors.lastname: Zeng
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. Electronic address: shulezhang@163.com.
authors.forename: Shule
authors.initials: S
authors.lastname: Zhang
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
authors.forename: Jinli
authors.initials: J
authors.lastname: Deng
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. Electronic address: zq304@mail.njust.edu.cn.
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhong
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry; D003080:Cold Temperature; D008956:Models, Chemical; D009569:Nitric Oxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*
chemical_list: D010087:Oxides; C009495:titanium dioxide; D009569:Nitric Oxide; D003035:Cobalt; D000641:Ammonia; D014025:Titanium; C060728:cobalt oxide
keywords: CoO(x)–TiO(2) catalysts; NH(3)-SCR; Oxygen vacancies; Superoxide ions