SO3及其衍生物ABS（NH4HSO4）生成机理是当前燃煤烟气污染物控制理论的空白，其控制方法是燃煤烟气超低排放亟待解决的科学问题。课题采用微观分析仪器表征复合催化剂物理化学结构，建立SCR催化剂表面SO2/NO/NH3/H2O/O2等吸附/脱附反应动力学模型，研究SCR催化剂表面SO3生成特性，揭示SO3生成催化反应机理，为高效抗硫氧化催化剂研制提供理论基础；研究提出SCR催化剂表面高温催化ABS生成机理，揭示催化剂中毒的物理化学机制，为高效抗中毒催化剂配方提供科学依据；研究NH3/SO3/H2O/O2条件下低温非催化ABS生成演化机理，阐明ABS生成、沾污、沉积、腐蚀与分解特性,为ABS防控提供科学依据；研究高效SO3吸收剂配方，建立NO/SO2/SO3/HF/HCl多组分条件下竞争化学反应动力学模型，提出高效SO3脱除机理方法，为工业控制燃煤烟气SO3排放提供理论和技术基础。

The formation mechanism of SO3 and its derivatives ABS (NH4HSO4) is still the blank of current control research about the control theory of coal-fired flue gas pollutants, that scientific problem is urgently need to be addressed for the ultra-low emission of coal-fired flue gas. The research proposed to use micro analytical instruments to characterize the physical and mechanical properties of catalyst, try to establish SO2/NO/NH3/H2O/O2 adsorption /desorption reaction kinetics model on SCR catalyst surface, studies the characteristics of SO3 generation by catalytic reaction on catalyst, thus providing the theoretical basis for developing an efficient catalyst which has high resistance for sulfur oxidation. To study and put forward generation mechanism of ABS by high temperature catalytic reaction on SCR surface, this study also try to reveal poisoning mechanism of catalyst through the change of physical and chemical properties, which will provide a scientific basis for developing high efficiency catalyst formula that can resistant for SO2 and SO3 poisoning; Research ABS generation and evolution mechanism under low temperature without catalytic reaction in NH3/SO2/H2O/O2 atmosphere, clarify characteristics of ABS generation, combination, deposition, corrosion and decomposition, which can provide scientific basis for prevention and control ABS. Study the effective formulation of SO3 absorbent, set up the NO/SO2/SO3/HF/HCl competitive chemical reaction kinetics model, propose efficient mechanism of SO3 removal method, that can provide theoretical and technical basis for the control of SO3 emissions in industrial coal-fired flue gas.