标题：Performance of V2O5-WO3-MoO3/TiO2 Catalyst for Selective Catalytic Reduction of NOx by NH3
作者：Gao Yan; Luan Tao; Lu Tao; Cheng Kai; Xu Hongming
作者机构：[Gao, Y] School of Energy and Power Engineering, Shandong University, Jinan 250061, China, School of Mechanical Engineering, University of Birmingham, 更多
通讯作者地址：[Luan, T]Shandong Univ, Sch Energy & Power Engn, Jinan 250061, Peoples R China.
关键词：selective catalytic reduction;V2O5-WO3-MoO3/TiO2 catalyst;physico-chemical property;flue gas;life time
摘要：The V2O5-WO3-MoO3/TiO2 honeycomb catalyst was prepared with industrial grade chemicals. The structural and physico-chemical properties were analyzed with X-ray diffraction (XRD), scanning electron micrograph (SEM) and mercury porosimetry. The NOx conversion and durability were investigated on a pilot plant test set under the actual operational conditions of a coal fired boiler. The catalyst monolith had good formability with mass percentage of V : Mo : TiO2 : fiber glass = 1 : 4.5 : 4.5 : 72 : 18. Vanadium, tungsten and molybdenum species were highly dispersed on anatase TiO2 without causing the transformation of anatase TiO2 to ruffle by calcining under a current of air at 450 degrees C for 4.5 h, but there were some degrees of crystal distortion. The catalyst particle sizes were almost uniform with close pile-up and the pore structure was regular with complete macro-pore formation and large specific surface area. The NOx conversion was sensitive to temperature but nearly insensitive to NH3. The catalyst showed strong adaptability to NOx concentration with activity above 80% in the range of 615-1640 mg center dot m(-3). Within the range of 720-8640 h continuous operation, the NOx conversion dropped at a rate of about 1% reduction per 600 h.