Zeolites volatile organic compounds

In addition to zeolites, the MMS have been also applied in gas cleaning. In this regard, attention paid to this novel family of adsorbents is mostly because of the unique mesopore structure, which is not shared by any other families of adsorbents. On the other hand, the hydrophobic surface nature of the MMS [2] indicates that these materials are selective adsorbents for the removal of volatile organic compounds (VOCs) and other organic compounds contained in high-humidity gas streams or wastewater [119],... 

Li J, Werth CJ (2001) Evaluating competitive sorption mechanisms of volatile organic compounds in soils and sediments using polymers and zeolites. Environ Sci Technol 35 568-574... 

The main pollutants in gaseous emissions concern volatile organic compounds (VOCs), greenhouse gases, NOx and SOx. We will only discuss the emissions which can potentially be treated by zeolites. 

SINGLE AND MULTI COMPONENT ADSORPTION OF VOLATILE ORGANIC COMPOUNDS ONTO HIGH SILICA ZEOLITES - DISCUSSION OF ADSORBED... 

Li J.-M. and Talu O., Effect of structural heto-ogeneity on multicomponent adsorption benzene and p-xylene mixture on silicalite, in M. Suzuki (ed.) Proc. IV Int. Corf, on Fundamentals of Adsorption, (Elsevio", Amsto dam, 1993) pp. 373-380. Meininghaus C. K.W. and Prins R., Sorption of volatile organic compounds on hydrophobic zeolites, Microporous and Mesoporous Materials 35-36 (2000) pp. 349-365. 

Recently, rotor-type adsorption systems attract much attention, because the systems can effectively control humidity and air pollutants such as volatile organic compounds (VOCs), nitrogen oxide (NOx) and sulfiuic oxide (SOx). Gas remediation efficiency is principally concerned to the gas capturing ability of the adsorbents impregnated into the ceramic honeycomb rotor such as zeolite, silica, activated carbon, etc. Therefore, it is one of the most important works to develop the adsorbent with good absorption-desorption behaviors. 

Catalytic Destruction of Volatile Organic Compounds on Platinum/Zeolite... 

P-23 - Total oxidation of volatile organic compounds - catalytic oxidation of toluene over CuY zeolites... 

The application of zeolite catalysts to pollution abatement is also promising. The main pollutants in gaseous emissions that can be potentially treated by zeolites are volatile organic compounds (VOCs) and NOx. 

Zeolites are widely used to adsorb hydrocarbons, including unwanted volatile organic compounds (VOCs) such as solvent vapour and unburnt fuel in automobile engines. They are also used in refineries and petrochemical plants to separate and purify products on a large scale. The zeolites are chosen on the basis of cost, capacity, resistance to process conditions and, particularly in petrochemical applications, for their ability to act as true molecular sieves. 

Molecular sieves is a term synonymous in this context to aluminosilicate hydrate also called zeolite. The zeolite is applied to deodorization, gas separation and some other processes. Since this material is, unlike activated carbon, non-combustible, it has increasingly been applied to concentrate volatile organic compounds, VOC. The concentration process discussed here applies to the VOC concentrator developed by Seibu Giken Co. Ltd. Japan. The element referred to here as the VOC concentrator is non-combustible and has a honeycomb structure. The key features are summarized below. 

Meininghaus C. K.W. and Prins R., Sorption of volatile organic compounds on hydrophobic zeolites, Microporous and Mesoporous Materials 35-36 (2000) pp. 349-365. 

Since 2004, many articles on preparation of zeolite MMs have been published, on such areas as MFI or Sil-1 zeolite etched on the Si substrate for gas separation applications, and MMRs for KCR and fine chemical synthesis (Coronas and Santamaria, 2004 Kwan et al, 2010 Wan et al., 2001 Yeung et al, 2005). Coronas and Santamaria (2004) have reported on the use of zeolite films and interfaces in micro-scale and portable applications, including the removal of volatile organic compounds from indoor air, recovery of catalysts in homogeneous reactions, zeolitic microreactors and microseparators, for example. Moreover, zeolite coated microreactors and microseparators exhibit high surface-to-volume ratio, and are capable of high productivity as a result of the good contact between reactants and catalyst wall. 

Adsorption has been playing an increasingly important role in environmental control. The sorbents being nsed in common industrial adsorption systems for the removals of SO2 and volatile organic compounds (VOCs) are qnite weU-estabUshed. The VOC removal systems often use activated carbon, polymeric resins, and hydrophobic zeolites, for both gas and aqueous systems. Activated carbon (and alkalized forms) and hydrophobic zeolites are used for SO2 removal. Lime injection is used for SO2 removal from hot gases. For NO removal, on the contiary, no suitable sorbents have been established. For this reason, selective sorbents for NO remain an active research area, and will be discussed. The search for CO2 sorbents is also of interest. The subject of CO2 sorbents has been discussed recently in an excellent review by Yong et al. (2002) and will not be covered here. 

Beauchet, R., Magnoux, P. and Mijoin, J. (2007). Catalytic oxidation of volatile organic compounds (VOCs) mixture (isopropanol/o-xylene) on zeolite catalysts, Catal Today, 124, pp. 118-123. 

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