共查询到17条相似文献,搜索用时 171 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
脉冲电晕放电降解CH2Cl2的初步研究 总被引:13,自引:0,他引:13
对高压脉冲电晕放电降解CH2Cl2进行初步研究,比较了正负脉冲电晕降解的活性,正脉冲电晕优于负脉冲电晕。探讨了脉冲形成电容Cp之值及反应器的电晕线材料对降解反应活性的影响。为进一步提高室温下CH2Cl2的降解,在反应器中加入BaTiO3为催化剂,在高压脉冲电场下,BaTiO3受激产生局部电晕,增强了电晕放电流性,提高了反应活性,CH2Cl2的转化率达90%以上。 相似文献
10.
11.
The paper presented the results regarding the decomposition of gaseous CF2ClBr by cold plasma method.After two minutes discharge,the maximum decomposition rate of 2660 Pa CF2ClBr pure and 2660 Pa CF2ClBr plus 7980 Pa O2 reached 60% and 80%,respectively.The paper also studied the cold plasma gas phase chemistry reaction mechanism of CF2ClBr at low pressure,and the pressure effects of CF2ClBr and added gas(He,N2,O2 and dry air)on the CF2ClBr decomposition respectively by cold plasma method.These studies will be helpful to application of cold plasma method in the treatment of hazardous gaseous wastes. 相似文献
12.
13.
Liu Zhengchao Pan Xunxi Dong Wenbo Hou Huiqi Zhang Zhenman Hou Jian Yu Yong Li Changlin 《环境科学学报(英文版)》1997,9(1):95-99
In this paper pulsed corona discharge is shown to be effective for the decomposition of CF3Cl(Freon-13).The pressure of CF3Cl was 2.67×103Pa,after discharged for 2 min,39.5% of CF3Cl was decomposed.The products were mainly CF4,Cl2 and CF2Cl2.The yield increased by adding O2 or air.Under the same conditions,more than 94% decomposition yield was obtained if 5.32×103Pa O2 or air was added.The composition of products became CF2O,Cl2 and CF4.While the partial pressure of O2 or air reached 1 arm,the decomposition yield decreased to 54.5% and 48. 5% respectively. 相似文献
14.
《Atmospheric Environment. Part A. General Topics》1990,24(9):2499-2511
We have measured, using a conventional discharge-flow resonance-fluorescence technique, the rates of reaction between the hydroxyl radical and a series of halogenated ethanes and ethers for the temperature range 230–423 K. Our measurements gave the following Arrhenius expressions (units are cm3 molecule−1 s−1): CF2HCH3 (HFC-152), 14.2 × 10−13 exp-(1050/T); CF2ClCH3 (HCFC-142b), 2.6 × 10−13 exp-(1230/T); CFCl2CH3 (HCFC-141b), 5.8 × 10−13 exp-(1100/T); CF3CFH2 (HFC-134a), 5.8 × 10−13 exp-(1350/T); CF3CF2H (HFC-125), 2.8 × 10−13 exp-(1350/T); CF3CCl2H (HCFC-123), 11.8 × 10−13 exp-(900/T); CF2HOCF2CFClH, (enflurane), 6.1 × 10−13 exp-(1080/T); CFH2OCH(CF3)2, (sevoflurane), 15.3 × 10−13 exp-(900/T). In two cases, we measured rate constants only at room temperature: CF3CClBrH (halothane), 6 × 10−14 and CF2HOCClHCF3 (isoflurane), 2.1 × 10−14.We also report the following values for the integrated absorption cross-sections of the compounds in the spectral region 800–1200 cm−1 in units of cm−2 atm−1: CF2HCH3, 1155; CF2ClCH3, 1422; CFCl2CH3, 1995; CF3CFH2, 2686; CF3CF2H, 1970, CF3CCl2H, 1411; CF3CClBrH, 1400; CF2HOCF2CFClH, 4800; CF2HOCClHCF3, 3900; CFH2OCH(CF3)2, 2550. We use our measurements to calculate ozone depletion potentials and greenhouse warming potentials relative to CFCl3 for each compound. 相似文献
15.
16.
草甘膦是一种被广泛使用的除草剂,天然矿物的吸附-氧化作用对草甘膦的降解具有重要影响.本文研究了草甘膦在MnO2表面的吸附-氧化行为,考察了草甘膦在MnO2表面的降解动力学,以及反应体系pH和共存阳离子对MnO2吸附-氧化降解草甘膦的影响,初步分析了草甘膦的降解产物和可能的降解途径.结果表明,MnO2可有效降解草甘膦,草甘膦在MnO2表面的降解符合表观准一级动力学模型,表观反应动力学常数随草甘膦浓度的增大而减小;酸性条件有利于MnO2对草甘膦的去除,共存Cu2+对MnO2去除草甘膦有明显的抑制作用;草甘膦的降解产物包括肌氨酸、氨基乙酸、羟基乙酸、甲酸和乙酸及PO3-4、NH+4和NO-3. 相似文献
17.
Decomposition of trifluoromethane in a dielectric barrier discharge non-thermal plasma reactor 总被引:1,自引:0,他引:1
The decomposition of trifluoromethane (CHF3) was carried out using non-thermal plasma generated in a dielectric barrier discharge (DBD) reactor. The effects of reactor temperature, electric power, initial concentration and oxygen content were examined. The DBD reactor was able to completely destroy CHF3 with alumina beads as a packing material. The decomposition efficiency increased with increasing electric power and reactor temperature. The destruction of CHF3 gradually increased with the addition of O2 up to 2%, but further increase in the oxygen content led to a decrease in the decomposition efficiency. The degradation pathways were explained with the identified by-products. The main by-products from CHF3 were found to be COF2, CF4, CO2 and CO although the COF2 and CF4 disappeared when the plasma were combined with alumina catalyst. 相似文献