| Human habit has been increasingly polluted and influenced with a rapidly development of industry. Obnoxious gases has gradually become an serious problem which pose a threat to social life quality and public health, especially those emitted from industrial production.In recent years, the increasingly social demand for treatment of oders promoted the development of technologies of control, many noval techniques springs up:ozonization, palsma technology, photocatalytic degradation and so on.Adsorption has been widely used all over the world as its unique physical-chemical feature and simplified operation. Also, some adsorbents are used in treatment of air pollution as its large adsorption capacity.But none of these can carry out with a popuarity in a short time because of the deficiencies. This article introduced Al2O3 and zeolite into adsorption tests as adsorbent, surface modified samples are prepared to remove orders with a higher efficiency.The former half of the article summarizes the composition of adsorbent and the theory of modified adsorption. Modified sample with a better surface Stability, self-adsorb feature, high-temperature impregnation by Mn(NO3)2 and La(NO3)3 are contribute to the better adsorbing performance.SEM and XRD test first shows that modification in micro-structure and increase of specific surface area promote a better adsorption ability and a higher thermo-stability respectively.Secondly, single-factor tests shows that increase in roasting temperature, impregnation time and concentration of impregnation solution in a reasonably extent lead to a advance on adsorption.Based on these, H2S adsorption tests illustrated that adsorption breakthrough effect fits right in with the modification treatment, which further shows that adsorbing functionality is directly attributed to the specific area.High column temperature leads to a negative effect in adsorption while La-Al2O3 perform more steadily in high temperature window.Besides, weight hour space velocity, of mixture of H2S and carrier gas, leads to a higher efficiency with its increase in a 2h extent. Friedrich model can satisfactorily interpret the fitted curve.The later half of this article discusses the influence on adsorption as the modified zeolite is used as a adsorbent Surface acid functional group determination illustrated that the style of acid solution and the strength of digestion plays the most important role in preparation such as acidified impregnation, transition metal digestion and rare metal digestion, using zeolite as the base material.The influence factor on metal- impregnation is similar to the unit of modified Al2O3 while the main difference is caused by chloride in the digestion solution.Preparation by GZ-Co and GZ-La zeolite strengthen the adsorption function mostly while GZ-La perform more steadily in high temperature adsorption.Micro-model of inter-ion exchange adsorption is established through NH3 adsorption by GZ-La, which gives.H2S and NH3 adsorption by satisfied adsorbent, which are prepared by modification of Al2O3 and zeolite, demonstrated that modification can be widely used in the treatment of gases. New viewpoint and thought of gas physical treatment come true, which may be widely adopted. |
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