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Production of ammonia from plasma-catalytic decomposition of urea: Effects of carrier gas composition

查看全文 作　　者：Xing [1]Fan;Jian [1]Li;Danqi [1]Qiu;Tianle [2]Zhu 高影响力作者 机构地区：[1]Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering,Beijing University of Technology;[2]School of Space and Environment, Beihang University高影响力机构 出　　处：《Journal of Environmental Sciences》索引2018年第30卷第4期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Nos. 21547004, 51638001);the Beijing Natural Science Foundation (No. 8152011);the Scientific Research Program of Beijing Municipal Education Commission (No. KM201510005009) 摘　　要：Effects of carrier gas composition(N_2/air) on NH_3 production, energy efficiency regarding NH_3 production and byproducts formation from plasma-catalytic decomposition of urea were systematically investigated using an Al_2 O_3-packed dielectric barrier discharge(DBD) reactor at room temperature. Results show that the presence of O_2 in the carrier gas accelerates the conversion of urea but leads to less generation of NH_3. The final yield of NH_3 in the gas phase decreased from 70.5%, 78.7%, 66.6% and 67.2% to 54.1%, 51.7%, 49.6% and 53.4% for applied voltages of 17, 19, 21 and 23 kV, respectively when air was used as the carrier gas instead of N_2.From the viewpoint of energy savings, however, air carrier gas is better than N_2 due to reduced energy consumption and increased energy efficiency for decomposition of a fixed amount of urea. Carrier gas composition has little influence on the major decomposition pathways of urea under the synergetic effects of plasma and Al_2 O_3 catalyst to give NH_3 and CO_2 as the main products. Compared to a small amount of N_2 O formed with N_2 as the carrier gas, however,more byproducts including N_2O and NO_2 in the gas phase and NH_4 NO_3 in solid deposits were produced with air as the carrier gas, probably due to the unproductive consumption of NH_3, the possible intermediate HNCO and even urea by the abundant active oxygen species and nitrogen oxides generated in air-DBD plasma. 关 键 词：催化剂 搬运 气体 生产 分解 血浆 脲 氮氧化物
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