DBD等离子体催化合成氨与系统谐振的相关性

Correlation between ammonia synthesis using DBD plasma coupled with catalyst and resonant characteristics

为了研究介质阻挡放电(DBD)等离子体催化合成氨与谐振的相关性,在DBD等离子体反应器内,分别考察了操作参数(输入电压、气体总流量及V(N2)∶V(H2))和结构参数(有无催化剂填充、放电区宽度及催化剂粒径)对氨产率(单位时间氨产量)和DBD系统谐振特性的影响,进一步阐述DBD等离子体催化合成氨与谐振的相关性.结果表明:DBD谐振频率处氨产率最高;输入电压和放电区宽度增加,DBD谐振频率减小,而DBD谐振频率的减小有利于氨产率的提高;气体总流量、V(N2)∶V(H2)、有无催化剂填充和催化剂粒径对DBD谐振特性影响不大,但提高气体总流量、增加V(N2)∶V(H2)、填充催化剂和减小催化剂粒径有利于氨产率的提高,研究结果为DBD等离子体催化合成氨工艺优化提供依据.

In order to study the correlation between ammonia synthesis using dielectric barrier discharge （DBD） plasma coupled with catalyst and resonant characteristics, the effects of operating parameters （input voltage, total gas flow rate and V（N2） ： V（H2） volume ratio） and structure parameters （presence of catalyst filling, width of discharge zone, particle size of catalyst） on ammonia yield （ammonia output per unit time） and resonant characteristics of DBD system were investigated in the DBD plasma reactor, respectively. Furthermore, the correlation between ammonia synthesis using DBD plasma coupled with catalyst and resonant characteristics was elaborated. The results showed that the ammonia yield was the highest in the resonance frequency of DBD system; the resonance frequency of DBD system decreased with the increasing of the input voltage and discharge zone width. Moreover, the decreasing of the resonance frequency was advantageous to the improvement of ammonia yield. The total gas flow rate, V（N2） ： V（H2） volume ratio, with or without catalyst filling and catalyst particle size only had little effect on the DBD resonant characteristics, but improved the total gas flow rate. increasing V（N2 ） ： V （H2）volume ratio, filling catalyst and decreasing catalyst particle size were advantageous to the improvement of ammonia yield. As a result, this research provides a basis for the process optimization of ammonia synthesis using DBD plasma coupled with catalyst.