中国电机工程学报Issue(32)：5734-5740,7.DOI:10.13334/j.0258-8013.pcsee.2014.32.006
γFe2O3的选择性催化还原脱硝性能及其对NH3和NO的表面吸附行为研究
A Study of Selective Catalysis Reduction Denitration Performance and Adsorption of NH3 and NO OverγFe2O3 Catalyst
摘要
Abstract
The catalyst used for selective catalysis reduction (SCR) of NOx was prepared from γFe2O3 nanoparticles and characterized by XRD and BET methods. The catalytic experiments at low temperature were carried out in a fixed bed reactor. The adsorption and activation of NH3 and NO on γFe2O3 nano-catalyst were investigated by in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurement. Results showed that Fe2O3 used for catalytic reaction was pure maghemite phase with high thermal stability, and exhibited a high low-temperature denitration performance. The DRIFTS experiments showed that NH3 was mainly adsorbed on Lewis acid sites to form coordinated NH3, while partial NH3 was adsorbed on Brønsted acid sites to form ammonium at the temperature below 270℃. O2 promoted the dehydrogenation of coordinated NH3 to form amide species. O2 greatly enhanced the adsorption of NO on catalysts surface to form nitrate species and absorbed NO2. Two possible reaction paths on γFe2O3 catalyst were proposed. The SCR process mainly follows that NH2 formed by H-abstraction of coordinated NH3 reactes with NO to form N2 and H2O. In a relative low temperature range (<240℃), another reaction path follows that NO2(NH4+)2 as the key intermediate product reactes with NO to form N2, H2O and H+.关键词
γFe2O3催化剂/选择性催化还原(SCR)/脱硝/原位红外漫反射光谱/吸附Key words
γFe2O3 catalyst/selective catalysis reduction(SCR)/denitration/in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)/adsorption分类
能源科技引用本文复制引用
梁辉,查贤斌,归柯庭..γFe2O3的选择性催化还原脱硝性能及其对NH3和NO的表面吸附行为研究[J].中国电机工程学报,2014,(32):5734-5740,7.基金项目
国家自然科学基金项目(51276039)。Project Supported by National Natural Science Foundation of China (51276039) （51276039）
