Study On The Catalysts Of Sulf-Odor Pollution Treatment

With the industrial development, air pollution problems have become more serious,especially the toxic and harmful stench emissions into the atmosphere through various means,which posed a serious threat on human health and ecological security.Mainly aiming at thecharacteristics and current status of odor pollution of petro-chemical enterprises, in this paper,we chose sulfur-containing malodorous gas hydrogen sulfide as a typical object and made atreatment for lab-simulated malodorous gases using adsorption-catalytic oxidation method.This issue focuses on the research and development of the adsorptive catalyst withhigh-sulfur capacity at room temperature and resolving the key problems of low catalyticactivity ,poor regenerative ability and so on,by changing the experiment conditions. In theexperiment, we selected different carriers and different modifiers to Prepare SupportedCarbon-based catalysts and composite catalysts by compounding several modifiers,and welearned their adsorptive desulfurization performance under the conditions of a fixed inletconcentration, reaction temperature, bed height and gas flow parameters. In addition, becausemolecular sieve has a high catalytic activity at room temperature, this experiment synthesized4A molecular sieve by optimizing the preparation conditions and carried out a preliminarystudy for the performance of its adsorption and desulfurization in the same experimentalconditions.The results showed that sulfur capacity of super-activated carbon prepared by thisexperiment is up to 351mg/g, specific surface area is 2030 m2/g, micropore pore volume is0.608ml/g and its desulfurization ability is the best,followed by 4A molecular sieve and ACF,The least effective catalyst is the activated carbon, which capacity is only 46mg/g. Bycomparison of their physical properties, we can see that specific surface area and pore sizedistribution are the determinant factors of adsorptive properties.The modified experimentshowed that KIO3 is the best modifier for different carbon-based carriers. The sulfur capacityof super-activated carbon modified by KIO3 With the mass fraction of 1% is up to459mg/g ,and that of ACF modified by 3% KIO3 is up to 417mg/g, markedly improvedcompared with pre-modified but at a high cost and being not conducive to industrialization; and that of AC modified by 1% KIO3 is only 270mg/g, but an evident modificationresult. The sulfur capacity of 4A molecular sieve modified With differentconcentrations of Cu(NO3)2 has decreased compared with that before modification.But because of its low production cost, it will have a better development prospect. Inaddition, the desulfurization results of composite carbon-based catalysts were notsatisfactory because of the competitive adsorption between the different ions thataffected the overall adsorptive effect. The final adsorptive oxidation products ismainly simple substance sulfur, sulfuric acid and sulfate verified by a variety of tokenmeans. The regenerative results of the catalyst with better performance ofdesulfurization showed that the means of air-heat regeneration revealed the best effectwith regenerative sulfur capacity recovery rate of 39%.