摘要
针对低温条件下尿素-SCR存在的尿素分解不完全以及脱硝效率低的问题,利用介质阻挡放电产生非热等离子体,并将其与同时具有催化尿素分解和催化NO_x还原活性的MnO_x/Al_2O_3催化剂相结合,考察了非热等离子体对于低温(100℃)下尿素催化分解制氨以及NH_3-SCR和尿素-SCR脱除NO_x的强化作用。结果表明:仅有催化作用时100℃下尿素难以分解,NH_3-SCR也仅能脱除23. 0%的NO_x。在催化床层内施加较低放电功率(约10 W)的非热等离子体既可促使尿素在低温下高效分解制氨,又可显著强化NH_3-SCR对于NO的脱除,并最终在MnO_x/Al_2O_3催化剂表面实现尿素-SCR高效脱除NO。
In order to solve the problems such as incomplete urea decomposition and low denitrification efficiency existing in urea-SCR at low temperatures,non-thermal plasma( NTP) was generated by dielectric barrier discharge and combined with MnOx/Al2 O3 catalyst for both urea decomposition and NOx reduction in this study. The effects of NTP on urea decomposition and NOx removal by NH3-SCR and urea-SCR were separately investigated at low temperature( 100 ℃). Experimental results showed that urea could not be effectively decomposed by catalysis under 100 ℃,and NOx removal efficiency could only reach23. 0% by NH3-SCR. Generation of NTP in the catalyst bed at low discharge power(~ 10 W) could achieve effective production of ammonia from urea decomposition,and significantly promote the removal of NO by NH3-SCR and eventually obtain efficient removal of NO by urea-SCR on the surface of MnOx/Al2 O3 catalyst.
作者
樊星
亢思静
李坚
安登飞
FAN Xing;KANG Si-jing;LI Jian;AN Deng-fei(Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;Central Research Institute of Building and Construction Co., Ltd , Beijing 100088 , China)
出处
《环境工程》
CAS
CSCD
北大核心
2019年第3期118-123,共6页
Environmental Engineering
基金
国家自然科学基金项目(21707004
51638001)
北京市自然科学基金项目(8152011)
