| VOCs emissions issue has been aroused great concern in various circles of society. With the domestic and international situation becoming more serious, as the biggest textile country in the world, VOC emissions Problems of China need to be solved urgently. In this study, the Properties of Ce-Mn/GF catalyst in the combustion on polyester cotton heat setting waste gas were investigated. Preliminary analysis of polyester cotton heat setting waste gas was carried out by Solubility test and boiling point test, and based on the preliminary analysis above, GC-MS and infrared spectroscopic were used in testing the component of waste gas. Waste gas would be captured by activated carbon fiber, and the fiber containing the waste gas was extracted hexamethylene. Ultraviolet spectrophotometry was used to analyze the waste gas content of extraction solution. High temperature inorganic glass fiber(GF) was selected as the catalyst carrier in this study, and the glass fiber was modified to reach the best effect of loading. Response surface methodology was used in glass fiber pretreatment test and catalyst preparation test, which was in order to identify the optimal pretreatment conditions and catalyst preparation conditions.Systematic study on Ce-Mn/GF(x) series catalyst in the combustion of polyester cotton heat setting waste gas was investigated, and catalyst activity influence of different Ce/Mn ratio was analyzed. Besides, the effect of O2, space velocity on the Ce-Mn/GF(x) catalysts activity wereinvestigated detailed as well. The surface properties of the catalysts were examined using Brunauer-Emmett-Teller(BET), X-ray photoelectron spectroscopy(XPS), X-ray diffraction(XRD), and scanning electron microscopy(SEM).The result showed as followings:(1) Polyester heat setting oil sample waste gas can be dissolved in cyclohexane. high-boiling substance(>200℃) oriented most in Waste gas oil, which occupied 88.22%. Polyester heat-setting gas is mainly composed of decalin and alkanes composition, and decalin content is slightly higher than paraffin content. Cyclohexane secondary extraction rate was 100%, and standard oil sample standard curve was y = 0.02223x- 0.01153, R2 = 0.9992. Sample quality- exhaust gas concentration standard curve was y = 2.6091x- 0.07075, R2 = 0.9886.(2) In glass fiber pretreatment test, the order of three factors influence the remote rate in polyester heat setting waste gas was as followed, pretreatment temperature> HCl concentration >pretreatment time. Optimal conditions of glass fiber pretreatment test exited, Ywaste gas removal=89.13%, pretreatment temperature was 49℃, HCl concentration was 2mol /L, pretreatment time was 31 min. In catalyst preparation test, the order of four factors influence the remote rate in polyester heat setting waste gas was as followed, immersion time> calcination temperature>immersion temperature> calcination time. Optimal conditions of catalyst preparation test exited,Ywaste gas removal=87.91%, immersion time was 3d, calcination temperature was 226℃, immersion temperature was 53℃,calcination time was 4h.(3) The catalyst with a molar Ce/Mn ratio of 1:5 obtained high activity of waste gas removal at200℃ under GHSV of 40,000h-1. O2 concentration played important role in catalyst activity when O2 concentration was under 6%. Once O2 concentration was above 6%, the influence of it could be ignored. When GHSV of reaction was 20000h-1,30000h-1,40000h-1, the removal rate of waste gas was93.2%, 91.6%, 88.7% respectively, and when the GHSV is higher than 40000h-1, the waste gas removal rate dropped significantly. Activity of the catalyst had a certain relationship with its specific surface area and pore structure. Ce O2 and MnOx significantly affected the catalyst specific surface area. The increase of Ce content could increase the specific surface area, and the optimal Ce/Mn mole ratio was 1:5; Mn existed in Mn4 + state in Ce-Mn / GF(x) catalysts(x ≠ 0); CeO2 and Mn Ox were dispersed amorphous uniformly on the glass fiber. |
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