低温等离子体协同催化剂催化氧化一氧化碳的研究

摘要

设计了低温等离子体( NTP)和Hopcalite耦合体系,提高Hopcalite的稳定性,考察其CO的催化氧化性能.研究表明将Hopcalite与NTP的集成,在低浓度CO催化氧化方面显示了增强效应.耦合体系中CO转化率比单独催化剂体系以及单独的等离子体体系有较大幅度提高,且催化剂的稳定性也得到增强.考察了CO初始浓度、体积空速、水蒸气浓度对耦合体系中CO催化氧化性能的影响.结果表明,在较低的能量密度(SED= 71 J/L)下,CO转化率随着CO初始浓度、体积空速、水蒸气浓度的增大而降低;在较高能量密度(SED=261 J/L)下,CO转化率基本不受这些因素的影响.Hopcalite与NTP耦合体系,在能量密度261 J/L,水蒸气质量分数为16.924×10-3的条件下,可以保持CO的转化率在98％以上长达300 min.%This report aimed to eliminate CO formed in the VOCs decomposition using plasma and improve the catalytic stability of Hopcalite. The CO oxidation over non-thermal plasma-driven Hopcalite was studied. The synergetic effects between NTP and Hopcalite were proved under lower CO concentration, and the CO conversion in NTP + Hopcalite system was higher than the catalyst system and NTP system. The stability of Hopcalite was also improved. When the special energy density was 71 J/L, the CO conversion decreased with increasing CO initial concentration, GHSV and water concentration. When special energy density was increased to 261 J/L, the performance of CO elimination was hardly affected by this factor. The combined application of plasma and Hopcalite showed remarkable synergetic effects for CO oxidation. When the special energy density was 261 J/L and the vapor content was 16. 924×10-3, the CO conversion was almost 98% within 300 min.