Industrial Exhaust Gas Purification And Study Of The Mechanism Of Thiophene At Low Temperature Micro-oxygen Conditions And Methyl Mercaptan

In recent years the exhaust gas from industries are increasing along with the air pollution. With the rapid development of the energy chemical industry. People have paid more attention to industrial exhaust emissions. Industrial gas contained CO, H2S COS, CH3SH and C4H4S, PH3, SO2and other poisonous and harmful gases, these gases will not only seriously affect the quality of the product production, reduce the pollution of the catalyst efficiency but even threats to human health. However, the gas will produce a higher value, such as high purity of CO can be as the main raw material, mercaptan and thiophene can be used as pharmaceutical raw materials. This paper mainly research that adsorption purification industrial exhaust performance extremely mechanism of thiophene. The temperature, oxygen content and component are researched to study the effecet of thiophene and methyl mercaptan. At the same time it can be analysised by XRD、BET、XPS、TPD.Determined by multiple carrier screening experiment, The industrial coal activated carbon (AC) is decided to be the carrieras for thiophene and methyl mercaptan. After reading a large number of literature and multiple parallel experiments to determine the catalyst, the experimental results show that copper acetate modified activated carbon is far greater than other experimental components, its adsorption capacity is2.9times of the blank activated carbon, reached16.425mg/g.0.1mol/L copper acetate, calcination temperature is300℃, adsorption temperature of20℃, oxygen content was1.0%with the adsorption of thiophene on modified activated carbon catalytic efficiency has good effect. the adsorption efficiency more than90%within400min. BET characterization showed that calcination is an important factor in adsorption purification thiophene, it can provide the best carrier activated carbon pore structure and specific surface area, combined with the SEM, XRD, SEM and EDS characterization means such as can be concluded that the CuO is reaction centers. The adsorption process has not only adsorption and catalytic oxidation, cleaning effect is good. The sulfate was appeared on activated carbon adsorption process, and S element and copper crystal take over the surface active sites and decreased the adsorption efficiency of activated carbon. After the single-component experiment, Experiment of thiophene compound component adsorption purification effect to investigation. The different composite components were research such as Cu/Zn、Cu/Fe、Cu/Co、Cu/Ni、Cu/Ce、Cu/Mn etc. The experimental results of Cu/Fe components modified activated carbon adsorption efficiency is1.9times of one-component Cu modified activated carbon. After choose the compound active component, the experiment examines the component ratio, roasting temperature, adsorption temperature, oxygen content and other factors on the adsorption of thiophene purification effect, the results show that the use of isometric impregnation method and modification of the industrial coal activated carbon (AC) of thiophene (C4H4S) has good adsorption purification, the optimal preparation conditions of Cu/Fe=10/1, roasting temperature for500℃. Cu/Fe modified activated carbon for thiophene (C4H4S) adsorption purification process, adsorption temperature and the oxygen content is the key factors, the relatively optimum reaction conditions for adsorption temperature is20℃, oxygen content of0.5%. Through the characterization of activated carbon can be speculated that the The Cu2O, FeO are reaction centers on Cu/Fe modified activated carbon purification C4H4S reaction, Not only in the adsorption process for C4H4S but adsorption and catalytic oxidation, purification effect. In XPS characterization of the adsorbent surface with SO2, CuO and Fe2O3is generated.Methanethiol is toxic that has unpleasant organic sulfur gases, it will threaten human nerve palsy in high concentration, The article also studies the industrial activated carbon adsorption of methyl mercaptan purification effect. Experimental results show that Co modified activated carbon can effectively increase the purification ability of adsorption of methyl mercaptan. Co/AC in the process of preparation of active component concentration, roasting temperature is the main factor to influence adsorption purification effect. Increase the concentration of active components and improve the roasting temperature can improve the efficiency of purification methanethiol purification; Adsorption reaction concentration is0.2mol/L, in the process of roasting, the best active component burning temperature is300℃. Co/AC adsorption of methyl mercaptan in the process of adsorption temperature, oxygen content is the key that influence the effect of adsorption purification. Increased oxygen content and improve the reaction temperature can improve the efficiency of purification methanethiol purification, The best reaction condition for the oxygen content is1%, the adsorption temperature60℃.Co/AC adsorption purification methanethiol reaction in the average activation energy of21.737kJ/mol and-0.3level of reaction, which indicates that with the increase of adsorption capacity will inhibits the absorption reaction, bring down the rate of reaction. XPS characterization results showed that the catalyst surface is the generation of Co2O3and SO42-. The experiment of selective adsorption test shows that Co/AC only effective for methyl mercaptan, it selects methyl mercaptan. Through BET、XRD、XPS and selective adsorption experiment, the TPD characterization can be concluded that Co/AC is kind of selective adsorption, the active component of load on the activated carbon could be Co3O4、CoO heating stripping the TPD process on the surface modification of activated carbon produced SO2and H2S in the experiments, so presumably occurring on the surface modification of activated carbon is2CH3SH+9/2O2=SO2+2CO2+3H2O+H2S.