Abstract We investigated the changes of catalytic activities, characteristics, and cause of deactivation of the V/Ti and V/W/Ti-based various catalysts mainly used in NH3-SCR according to the thermal effects and roles of W addition. The physical and chemical properties of the catalysts were analyzed by XRD, XPS, SEM/EDX, Raman, TPD, DRIFT analyses. The main causes of deactivation of SCR activity include a formation of crystalline V at high temperature, and the solid solution phenomenon forming the Ti V O structure at low temperature. Moreover, an enhancement of the low temperature activity due to the formation of terminal polymeric V O species was concurrently observed with the formation of V2O5. When W was loaded on the VOx/TiO2 catalysts, the crystalline W O structure partially inhibited the formation of crystalline V2O5, while polymeric W inhibited the reduction of the specific surface area and formation of the Ti V O solid solution.

中文翻译：

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VOx/TiO2催化剂热效应失活的原因和钨添加的作用

摘要 根据W添加的热效应和作用，研究了主要用于NH3-SCR的V/Ti和V/W/Ti基各种催化剂的催化活性、特性和失活原因的变化。通过XRD、XPS、SEM/EDX、Raman、TPD、DRIFT等分析手段对催化剂的理化性质进行了分析。SCR活性失活的主要原因包括高温下结晶V的形成和低温下形成Ti VO结构的固溶现象。此外，随着 V2O5 的形成，同时观察到由于末端聚合 VO 物种的形成而导致的低温活性增强。当 W 负载在 VOx/TiO2 催化剂上时，结晶 WO 结构部分抑制了结晶 V2O5 的形成，