基于磁旋滑动弧等离子体催化的空气直接氧化固氮

Direct nitrogen fixation by air oxidation catalyzed based on magnetic rotating sliding arc plasma

以活性氧化铝(γ-Al_(2)O_(3))为载体通过浸渍法制备不同质量分数(5%、7.5%和10%)的MoO_(3)/Al_(2)O_(3)催化剂,并进行等离子体催化空气的氧化固氮研究.为了考察不同质量分数催化剂的结构差异,分别采用XRD、SEM和TEM表征催化剂的物理性质,结果表明催化剂结构稳定、分布均匀,有利于催化实验.利用制备的MoO_(3)/Al_(2)O_(3)催化剂进行磁旋滑动弧等离子体耦合催化空气固氮实验,结果表明制备催化剂对固氮有促进作用,在最佳工况下,NO_(3)的产出速率最高为1.17 mmol/min,相比同类研究中最高固氮效率985μmol/min有些许提升.

Three kinds of MoO_(3)/Al_(2)O_(3)catalysts with different mass fractions(5%,7.5%and 10%)were prepared by impregnation method using activated alumina(γ-Al_(2)O_(3))as the carrier,and they were used for the research of plasmacatalyzed air oxidation and nitrogen fixation.In order to investigate the structural differences of catalysts with different mass fractions,the physical properties of the catalysts were characterized by XRD,SEM,and TEM.It was found that the catalyst structure was stable and distributed uniformly,which was beneficial to the catalytic experiment.The prepared MoO_(3)/Al_(2)O_(3)catalyst was used to carry out a magnetically rotating gliding arc plasmacoupled catalytic air nitrogen fixation experiment,and experiment results showed that the catalyst had a promoting effect on nitrogen fixation.Under the optimal conditions,the output rate of NO_(3)reached up to 1.17 mmol/min.Compared with the highest nitrogen fixation efficiency of 985μmol/min in similar studies,it was slightly improved.