DBD coupled with MnOx/γ-Al2O3 catalysts for the degradation of chlorobenzene

This paper investigates the degradation of chlorobenzene by dielectric barrier discharge(DBD)coupled with MnOx/γ-Al2O3 catalysts.MnOx/γ-Al2O3 catalysts were prepared using the impregnation method and were characterized in detail by N2 adsorption/desorption,x-ray diffraction and x-ray photoelectron spectroscopy.Compared with the single DBD reactor,the coupled reactor has a better performance on the removal rate of chlorobenzene,the selectivity of COx,and the inhibition of ozone production,especially at low discharge voltages.The degradation rate of chlorobenzene and selectivity of COx can reach 96.3%and 53.0%,respectively,at the specific energy density of 1350 J l-1.Moreover,the ozone concentration produced by the discharge is significantly reduced because the MnOx/Al2O3 catalysts contribute to the decomposition of ozone to form oxygen atoms for the oxidation of chlorobenzene.In addition,based on analysis of the byproducts,the decomposition mechanism of chlorobenzene in the coupled reactor is also discussed.     

热固性模塑聚苯乙烯泡沫板改性技术研究

为了改变聚苯乙烯保温板热塑性的燃烧本质,采用特殊阻燃剂,即热固性酚醛树脂/Al(OH)_3阻燃液对聚苯颗粒进行阻燃包覆。通过对主要制备工艺的优化研究,成功制得热固性聚苯乙烯泡沫保温板,并解决了保温板阻燃和保温相互制约的难题。结果表明:包覆改性后的聚苯乙烯板遇火燃烧时不产生熔融收缩现象,表面只是发生碳化,板材各项性能均满足标准要求,保温板燃烧性能可达B1级,热值为20.3MJ/kg,导热系数小于0.036W/(m·K)。     

Decomposition of dioxin-like components in a DBD reactor combined with Hg/Ar electrodeless ultraviolet

A new combined reactor with Hg/Ar electrodeless ultraviolet(EDUV)activated by DBD for 3,4-dichlorodiphenyl ether abatement is presented.The effect of specific input energy and feeding gas component on 3,4-dichlorodiphenyl ether removal efficiency has been explored.Compared with a single DBD system,this new combined process performed a significant promotion on 3,4-dichlorodiphenyl ether abatement.Experiment results verified that active oxygen clearly contributed to the synergistic activity of DBD-EDUV system.Results of emission spectra showed that UV radiation of 253.7 nm could be detected in the DBD-EDUV system.Further,the products of DBD-EDUV process were analyzed via gas chromatographymass spectrometer(GC-MS)to reveal involved decomposition mechanism.     

阻燃硬泡聚氨酯(PIR)保温板生产工艺及产品性能研究

结合实际生产详细介绍PIR聚氨酯板材生连续生产线温度、流量、压力等工艺参数对PIR聚氨酯板材性能的影响,并对生产的聚氨酯板材各项性能指标进行测试。结果表明:在链板温度65℃、链板线速度3.75m/min工艺参数下生产的板材性能均达国家标准,氧指数为33%,燃烧等级达B1级。