首页|Improving NH3-SCR denitrification performance over WaCo_(0.4)TiOx catalysts:Effect of surface acidity due to W addition on low-temperature and high-temperature activity
Improving NH3-SCR denitrification performance over WaCo_(0.4)TiOx catalysts:Effect of surface acidity due to W addition on low-temperature and high-temperature activity
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A serial of WaCo_(0.4)TiOx catalysts(a = 0.04,0.06,0.08,0.10)was synthesized by sol-gel method,which exhibited high NH3-SCR denitrification performance in a wide activity temperature window.W_(0.08)Co_(0.4)TiOx achieve best SCR activity(over 90% NO conversion)at 190-430 ℃ and good resistance to H2O/SO2.Various characterizations were used to investigate the influence of W doping on physicochemical property of these catalysts.Especially,in-situ DRIFTS were used to evaluate the type of acid sites,NOx adsorption,the reactivity of surface adsorption species,and the influences of H2O/SO2 on adsorption of NOx and NH3.The doping of W enhanced the acidity and weakened the oxidation capacity of WaCo_(0.4)TiOx,but higher surface acidity,especial more Br0nsted acid sites,can compensate for the effect of the decrease in the oxidation capacity on low-temperature activity.The optimal activity over W_(0.08)Co_(0.4)TiOx can be derived from the synergistic effect of surface acidity and oxidation performance.
WCoTiOx oxides catalystSelective catalytic reductionAmmoniaNOx removalEffect of acidity
Zheng Liu、Xiaoyu Zhao、Yingying Li
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Key Laboratory of Functional Inorganic Material Chemistry(Heilongjiang University),Ministry of Education,School of Chemistry and Materials,Heilongjiang University,Harbin 150080,PR China
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