整体式堇青石负载的Cu-SSZ-13分子筛催化剂的制备及其氨选择性催化还原脱硝性能  

Preparation of monolithic cordierite supported Cu-SSZ-13 catalyst and its performance in the selective catalytic reduction of NOx with NH3

作　　者：孟鹏通 范超 吕文婷 吴志伟[1] 焦卫勇[1] 李俊汾[1] 秦张峰[1] 樊卫斌[1] 王建国 MENG Peng-tong;FAN Chao;Lü Wen-ting;WU Zhi-wei;JIAO Wei-yong;LI Jun-fen;QIN Zhang-feng;FAN Wei-bin;WANG Jian-guo(State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100049

出　　处：《燃料化学学报》2020年第10期1216-1223,I0004,共9页Journal of Fuel Chemistry and Technology

基　　金：中国科学院战略性先导科技专项(XDA21020500);山西省科技攻关项目(MQ2014-11,MQ2014-10)资助。

摘　　要：以聚乙烯醇(PVA)或拟薄水铝石(SB粉)为涂覆助剂,采用超声波辅助分散法将Cu-SSZ-13分子筛涂覆于蜂窝状堇青石(Cordierite)上,制备了整体式堇青石负载的Cu-SSZ-13分子筛催化剂(Cu-SSZ-13/Cordierite),用于氨选择性催化还原(NH3-SCR)脱硝,并结合XRD、氮气吸附、SEM及H2-TPR等表征手段,研究了涂覆助剂对该催化剂的Cu-SSZ-13涂层稳定性、NH3-SCR脱硝活性、水热稳定性和抗SO2毒化能力的影响。结果表明,以PVA为涂覆助剂制备的整体式Cu-SSZ-13(PVA)/Cordierite催化剂,其Cu-SSZ-13涂层稳定、脱落率低,选择性催化还原脱硝活性与Cu-SSZ-13原粉基本相当;同时,该Cu-SSZ-13(PVA)/Cordierite催化剂也具有较好的耐高温水热稳定性和抗硫中毒能力,在移动源和固定源脱硝方面有较好应用前景。A series of monolithic cordierite supported Cu-SSZ-13 catalysts(Cu-SSZ-13/Cordierite)was prepared by coating the Cu-SSZ-13 molecular sieves on the cellular cordierite through ultrasonic dispersion with polyvinyl alcohol(PVA)or pseudo boehmite powder(SB)as assisting agent and used in the selective catalytic reduction of NOx with NH3(NH3-SCR).With the help of XRD,nitrogen sorption,SEM and H2-TPR characterization techniques,the influence of coating assistant agent on the firmness of the Cu-SSZ-13 layer,catalytic activity in the NH3-SCR of NO,hydrothermal stability and resistance against SO2 poisoning was then investigated.The results indicate that by using PVA as the coating assistant agent,a firm layer of Cu-SSZ-13 can be formed on the surface of monolithic Cu-SSZ-13/Cordierite catalyst.Moreover,the Cu-SSZ-13(PVA)/Cordierite exhibits high catalytic activity in the NH3-SCR of NOx(close to that of the pristine Cu-SSZ-13 molecular sieve),high hydrothermal stability and good tolerance to SO2,displaying great potential as a practicable catalyst for the removal of NOx from exhausts of both the mobile and the stationary sources.

关 键 词：Cu-SSZ-13 堇青石 整体式催化剂 氨选择性催化还原 脱硝 

分 类 号：O643.36[理学—物理化学] X773[理学—化学]