低温脱硝脱氯苯钒钼钛基催化剂研究——钼负载量的影响  

Study on Vanadium-Molybdenum-Titanium-Based Catalyst for Low-Temperature De-Nitration and De-Chlorobenzene:Effect of Molybdenum Loading

作　　者：张昭军 许战峰 郑勇 苏龙龙 吴雪莲 王琪 崔鹏 ZHANG Zhao-jun;XU Zhan-feng;ZHENG Yong;SU Long-long;WU Xue-lian;WANG Qi;CUI Peng(School of Chemistry and Chemical Engineering,Hefei University of Technology,Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering,Hefei 230009,China;Tongxing Environmental Protection Technology Co.Ltd.,Hefei 230092,China)

机构地区：[1]合肥工业大学化学与化工学院,先进催化材料与反应工程安徽省重点实验室,安徽合肥230009 [2]同兴环保科技股份有限公司,安徽合肥230092

出　　处：《安徽化工》2024年第1期89-93,共5页Anhui Chemical Industry

摘　　要：采用浸渍法制备了不同钼负载量的钒钼钛基催化剂,评价了催化剂的脱硝、SO2氧化和脱氯苯的性能,并采用BET、XRD、Py-FTIR、NH3-TPD、NO-TPD和SO_(2)^(-)TPD对催化剂进行了表征。结果显示,催化剂比表面积比较接近,活性组分在TiO2载体表面分散均匀,未发现明显的活性物种XRD衍射峰。吡啶吸附原位红外结果表明,钼的添加增大了表面B酸和L酸位点数目。程序升温脱附表征显示,随着钼负载量的增加,催化剂表面中强酸性位点略有增多,削弱了催化剂对NO和SO_(2)的吸附能力,因此催化剂脱硝和硫氧化性能逐渐减小,脱氯苯的性能有所增加。钼负载量为6wt%时,催化剂的综合脱硝脱氯苯性能较佳。In this paper,vanadium-molybdenum titanium-based catalysts with different molybdenum loading were pre-pared by impregnation method.The performance of the catalysts for denitration,SO2 oxidation and dechlorobenzene was evaluated.The catalysts were characterized by BET,XRD,Py-FT-IR,NH3-TPD,NO-TPD and SO2-TPD.The results showed that the specific surface area of the catalyst was relatively close,the active components were evenly dispersed on the surface of the TiO2 carrier,and no obvious XRD diffraction peak of the active species was found.In situ infrared adsorption of pyridine showed that the addition of molybdenum increased the number of B-acid and L-acid sites on the surfaceof the catalyst.The characterization of temperature-programmed desorption showed that with the increase of mo-lybdenum loading,themiddle-strong acidic sites on the catalyst surface increased slightly,which weakened the adsorp-tion capacity of the catalyst for NO and SO2.Therefore,the denitration and sulfur oxidation performance of the catalyst decreased gradually,and the performance of dechlorobenzene increased.The comprehensive performance of denitration and dechlorinationofthe catalyst is better when the molybdenum load is 6wt%.

关 键 词：钒钼钛催化剂 钼含量 脱硝 脱氯苯 

分 类 号：X511[环境科学与工程—环境工程]