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Kong M.,Chongqing University | Liu Q.,Chongqing University | Wang X.,Chongqing University | Ren S.,Chongqing University | And 4 more authors.
Catalysis Communications | Year: 2015

The performance impact and poisoning mechanism of arsenic on commercial V2O5-WO3/TiO2 SCR catalysts were studied. XRD, BET, FT-IR and XPS were used to characterize its physical-chemical properties. The results showed that As2O3 would be adsorbed on the catalyst surface and most oxidized by surface chemisorption oxygen to ultimately form As2O5. Lattice oxygen of V2O5 may also be transformed into surface sorption oxygen to oxidize As2O3, but tungsten and titanium species showed no changes in this progress. The creating As2O5 formed dense layer on catalyst surface, preventing NH3 adsorption and active sites recovery, which finally resulted in catalytic deactivation. © 2015 Published by Elsevier B.V. Source


Xi W.,Chongqing University | Xi W.,Chongqing Yuanda Catalyst Manufacturing Co. | Liu Q.,Chongqing University | Yang J.,Chongqing University | And 4 more authors.
Chinese Journal of Environmental Engineering | Year: 2013

Using modified cordierite and anatase-TiO2 as the carrier, WO3 as the addition agent and V2O5 as the active component, V2O5-WO3/Cordierite-TiO2 honeycomb selective catalytic reduction (SCR) for DeNOx application was prepared though mixing, extrusion, drying and calcination process. The surface area and crystal structure of V2O5-WO3/Cordierite-TiO2 catalyst were studied by BET and XRD. The abrasion resistance, water-absorption ratio, shrinkage ratio and activity were investigated by simulated flue gas analyzer and abration equipment, then through the comparison of water absorption and shrinkage of the catalyst samples. The results indicated that BET of 1%V2O5-WO3/10% Cordierite-TiO2 was larger than commercial catalyst, main crystalline phase of it was cordierite and anatase-TiO2, the abration ratio, water-absorption and shrinkage ratio of it were lower. When denitrification rate of it was above 80%, the temperature window of its activity could be widened from 300~400°C to 250~460°C, compared with commercial catalysts. Source


Xi W.C.,Chongqing University | Xi W.C.,Chongqing Yuanda Catalyst Manufacturing Co. | Liu Q.C.,Chongqing University | Niu D.L.,Chongqing University | And 6 more authors.
Advanced Materials Research | Year: 2014

The V2O5-WO3/TiO2 honeycomb catalysts with cordierite modified were prepared by solid-liquid mixing method. Its thermal stability, crystal structure, abrasion resistance and activity were studied by XRD, abrasion equipment and simulated flue gas analyzer,respectively. The results indicated that V2O5-WO3/Cordierite-TiO2 honeycomb catalyst possessed a better thermal stability, mechanical property and activity at the higher temperature comparing to commercial catalyst. There was no rutile phase present after the catalysts were calcined at 700°C and the vanadia and tungsten trioxide phases could be apparently visible on TiO2. © (2014) Trans Tech Publications, Switzerland. Source


Liu Q.-C.,Chongqing University | Xi W.-C.,Chongqing University | Xi W.-C.,Chongqing Yuanda Catalyst Manufacturing Co. | Yang J.,Chongqing University | And 3 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2013

The V2O5-WO3/cordierite-TiO2 honeycomb catalysts were prepared by solid-liquid mixing method, with cordierite modified. Surface morphology, thermal stability crystal structure, abrasion resistance and activity were studied by SEM, XRD, BET, abration equipment and simulated flue gas analyzer, respectively. The results indicated that the cordierite modified was introduced, V2O5-WO3/cordierite-TiO2 honeycomb catalyst was a large number of micro pores in its surface(which promote the reaction), good thermal stability. The phase of V2O5 and WO3 was amorphous or nanocrystalline state after it was calcined at 700°C. Abration ratio of V2O5-WO3/10% cordierite-TiO2 was law. Especially in the 250-460°C reaction, the denitration rate can be maintained above 80%. Source

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