摘要
采用修饰共沉淀法制得铈锰氧化物MnO_(x)-CeO_(2)催化剂,采用环境舱法,模拟太阳光在贴近真实夏季车内环境的低温低浓度工况下,考察太阳辐射强度、甲醛初始浓度对MnO_(x)-CeO_(2)热催化甲醛的性能影响,并进行催化动力学探究。结果表明,该催化剂孔道结构丰富,光热转化能力优秀,与单独的铈锰氧化物相比氧化能力有明显提升。在太阳辐射强度为450~650 W/m^(2)时,初始浓度为0.5 mg/m^(3)的甲醛降解率可达76.2%~82.1%,且E-R模型更贴近该实验数据。在太阳辐射强度为550 W/m^(2),初始浓度分别为0.2,0.5,1.0 mg/m^(3)时,降解率分别为63%,70.6%,78.3%,降解效果明显。此外,5种催化剂(MnO_(x)-CeO_(2)、MnO_(x)-CeO_(2)-TiO_(2)、TiO_(2)、Bi-V-O、CuO-MnO_(2))在相同实验条件下的甲醛催化效果表明,MnO_(x)-CeO_(2)降解率最高,为78.3%。该催化剂具备良好的稳定性。表明该催化剂在车内等低温低浓度环境下的甲醛催化氧化有着广泛的应用前景。
Cerium manganese oxide(MnO_(x)-CeO_(2))catalyst was prepared by modified co-precipitation method,and the catalytic effect of MnO_(x)-CeO_(2)on formaldehyde under the conditions of low temperature and low concentration close to the real car environment in summer was investigated by using the environmental chamber method.The effect of solar radiation intensity,initial concentration of formaldehyde on the performance of MnO_(x)-CeO_(2)thermal catalytic formaldehyde was investigated.The results showed that the catalyst had rich pore structure and excellent photothermal conversion ability.Compared with the Ce-Mn oxide alone,the oxidation ability of the catalyst was significantly improved.The formaldehyde degradation rate could reach 76.2%to 82.1%for the initial concentration of 0.5 mg/m^(3) at the solar radiation intensity of 450~650 W/m^(2),and the E-R model was closer to this experimental data.At the solar radiation intensity of 550 W/m^(2) and initial concentrations of 0.2,0.5 and 1.0 mg/m^(3),the degradation rate were 63%,70.6%and 78.3%,respectively,with obvious degradation effects.In addition,the formaldehyde catalytic effect of five different catalysts(MnO_(x)-CeO_(2),MnO_(x)-CeO_(2)-TiO_(2),TiO_(2),Bi-V-O,CuO-MnO_(2))under the same experimental conditions was compared,and it was found that the degradation rate of MnO_(x)-CeO_(2)was the highest,which was 78.3%,the catalyst has good stability.The results indicate that the catalyst has a wide application prospect in the catalytic oxidation of formaldehyde at low temperature such as in vehicles.
作者
王志强
王波
金梧凤
刘旺
WANG Zhi-qiang;WANG Bo;JIN Wu-feng;LIU Wang(Tianjin Key Lab of Refrigeration,School of Mechanical Engineering,Tianjin University of Commerce,Tianjin 300134,China)
出处
《应用化工》
CAS
CSCD
北大核心
2021年第12期3378-3383,共6页
Applied Chemical Industry
基金
天津市教委科研计划重点项目(2017ZD16)。
