V2O5/TiO2催化剂上NH4HSO4形成机理研究  

Study of Mechanism of NH_4HSO_4 Formation on V_2O_5/TiO_2 Catalyst

作　　者：廖永进 余岳溪 束航 张亚平[2] 杨林军[2] LIAO Yong-jin YU Yue-xi SHU Hang ZHANG Ya-ping YANG Lin-jun(Electric Power Research Institute of Guangdong Power Grid Co. Ltd. , Guangzhou 510080, P. R. China School of Energy and Environment, Southeast University, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education , Nanjing 210096 , P. R. China)

机构地区：[1]广东电网有限责任公司电力科学研究院,广州510080 [2]东南大学能源与环境学院,能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《科学技术与工程》2017年第10期81-88,共8页Science Technology and Engineering

基　　金：南方电网公司科技项目(K-GD2014-173);国家自然科学基金(51576039);国家重点基础研究发展计划(2013CB228505)资助

摘　　要：基于商用V_2O_5/TiO_2催化剂,通过模拟SCR脱硝试验装置的宏观试验及原位傅里叶变换红外的微观分析手段,对SO_2催化氧化机理及硫酸氢铵(ABS)的形成机理进行了研究。结果表明,SO_2吸附在催化剂表面后先与V^(5+)—OH基团反应生成了金属硫酸盐中间产物(VOSO_4),继而转化为SO_3,O_2与温度都对该反应有促进作用。催化剂上ABS生成主要有2种机理:一是由吸附态NH_3与气相或弱吸附态SO_2反应生成;二是由金属硫酸盐(VOSO_4)与气相NH_3直接反应生成。催化剂上ABS大约在200℃生成,在450℃分解,且NO能与ABS中的NH_4^+反应而促进其分解,但此反应与脱硝反应共存且为竞争关系。Based on commercial V2O5/TiO2 catalysts, the mechanism of SO2 catalytic oxidation and formation of ammonium bisulfate（ABS） were researched through macro-experiment on simulative experimental system of SCR DeNOx, combined with microscopic analysis methods of In situ Fourier transform infrared spectrometer（In situ FT- IR）. The results indicated that S02 oxidation was that SO2 initially reacted with V^5 ＋ -OH group on the catalyst surface after SO2 adsorption, for ming metal sulphate intermediate（ VOSO4）. In addition, the oxidation was accel-erated by O2 and temperature. The source of ABS on V2O5/TiO2 catalysts had two paths： on one hand, it could be formed by the reaction between adsorption NH3 and gas phase or weak adsorption SO2; on the other hand, the reac-tion between metal sulphate（ VOSO4 ） and gas phase NH3 could produce ABS. Whafs more, the study suggested that ABS could form at 200 ℃while decompose at 450℃ on V2O5/TiO2, approximately.

关 键 词：硫酸氢铵 V2O5/TIO2催化剂 烟气脱硝 原位红外 

分 类 号：X511[环境科学与工程—环境工程]