DBD等离子体协同Mn-TiO2/γ-Al2O3催化剂降解二甲苯
DEGRADATION OF XYLENE BY DBD PLASMA IN COLLABORATION WITH Mn-TiO2/γ-Al2O3 CATALYST
李茹 1李晓康 1冯燕 1王雪艳 1邢倩云1
作者信息
- 1. 西安工程大学环境与化学工程学院,西安 710048
- 折叠
摘要
采用浸渍法制备Mn-TiO2/γ-Al2O3催化剂,协同介质阻挡放电(DBD)等离子体降解二甲苯.探究了不同放电功率、初始质量浓度、气体流量下DBD等离子体对二甲苯的氧化性能;利用XRD和FT-IR对催化剂进行表征,以分析DBD等离子体放电前后催化剂的晶型与性能.结果表明:在放电功率为20 W,二甲苯进气浓度为38.62 mg/m3,进气流量为0.65 L/min条件下,协同Mn-TiO2/γ-Al2O3催化剂后,二甲苯降解率达到75.8％,反应器的能效为0.1027 g/(kW-h),同时O3浓度降低至36.94 mg/m3.表征结果显示,DBD等离子体放电前后未改变催化剂晶型与性能.为进一步分析降解二甲苯过程中产生的中间产物,通过FT-IR、GC-MS及发射光谱法进行诊断,发现加入催化剂后中间产物的种类和数量减少、发射光谱强度增强、特征谱线的数量增多.研究结果可为DBD等离子体在降解二甲苯应用中的性能优化和催化剂的选择提供理论参考.
Abstract
In this study,Mn-TiO2/γ-Al2O3 catalyst was prepared by impregnation method to degrade xylene with dielectric barrier discharge(DBD)plasma.The oxidation properties of xylene in DBD plasma under different discharge power,initial mass concentration,and gas flow were studied.The catalyst was characterized by XRD and FT-IR to analyze the crystal shape and properties of the catalyst before and after DBD plasma discharge.The results showed that under the conditions of discharge power of 20 W,inlet concentration of xylene 38.62 mg/m3 and inlet flow rate of 0.65 L/min,the degradation efficiency of xylene reached 75.8％and the energy efficiency of the reactor was 0.1027 g/(kW·h)after adding Mn-TiO2/γ-Al2O3 catalyst.At the same time,ozone concentration was reduced to 36.94 mg/m3.The characterization results showed that the crystal shape and properties of the catalyst were not changed before and after the DBD plasma discharge.To further analyze the intermediate products produced in the process of degradation of xylene,FT-IR,GC-MS,and emission spectroscopy were used for diagnosis.It was found that the types and quantity of intermediate products decreased,the emission spectral intensity increased,and the number of characteristic spectral lines increased after adding catalyst.This study can provide a theoretical reference for the performance optimization and catalyst selection of DBD plasma in the application of xylene degradation.
关键词
DBD等离子体/二甲苯/催化剂/等离子体诊断Key words
DBD plasma/xylene/catalyst/plasma diagnosis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据