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Showing 1 to 20 of 24 for “"Mordenite"”.
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Adsorption of Iodine and Water on Silver-Exchanged Mordenite
… the studied adsorbents, reduced silver-exchanged mordenite (Ag0Z) was widely recognized as the state-of-art adsorbent for iodine removal. It has been selected to be used in the Hanford Treatment and Immobilization Plant in Washington State, US, to control releases of the radioactive iodine in …
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The deactivation of Zeolite-Y and mordenite during hexane cracking and propene oligomerisation
The objective of this study was to determine the effect that the type of catalyst and reaction would have on the rate of deactivation, properties of coke and transport properties of the catalyst. HY and HM were chosen because of their different pore structures and acid site distributions. Hexane …
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Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite
SAP0-34 and mordenite, catalysts with quite different pore structures, are known to be suitable for methanol conversion to light olefins and propene oligomerization to a distillate type product, respectively. In this study, these catalysts were modified in various ways and the effect of these …
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The effect of hydrothermal and acid dealumination on the structural, acid and catalytic properties of Mordenite
… and acid dealumination on the properties of Mordenite, there is a lack of clarity on many issues related to the changes which these treatments cause to the structure, acidity and catalytic activity of Mordenite. Both methods remove aluminium from the framework thus creating extra framework …
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The inertisation of the zeolites ZSM-5, mordenite and beta by chemical vapour deposition using tetraethoxysilane
… inertise the external surface acidity of ZSM-5, Mordenite and Beta: (i) Chemical vapour deposition - Tetraethoxysilane (TEOS) was contacted with the catalyst using a vapour phase flow system and static vacuum system. The effects of deposition temperature and time were varied in order to vary the …
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Aging Study of Silver-exchanged Mordenite and Silver-functionalized Silica Aerogel in Dry Air, Humid Air, No and No2
… containing adsorbents such as silver exchanged mordenite (Ag0Z) and silver functionalized silica aerogel (Ag0-aerogel) used in this study. However, the aging impact of off-gas streams on the adsorbents is one of major issues in the removal of radioactive iodine vapor during off-gas treatment. …
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Alkylation of phenol with methanol over H-ZSM-5, H-Beta, H-Mordenite, H-USY and H-MCM-22
Alkylphenols are intermediates used in the synthesis of many important substances. The most significant of the commercially important lower alkylphenols are cresols (methyl phenols) and xylenols (dimethyl phenols). The main markets for alkylphenol products are nonionic detergents, phenolic resins, …
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Design and characterization of zeolite membranes for fluid separation
… the pores and on the surfaces of silicalite-1, mordenite and LTA zeolites. Molecular dynamic simulations were used to investigate the influence of temperature and molecular loadings on the diffusional behaviour of hydrocarbons in zeolites. Both hydroxylated (surface termination with hydroxyl …
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Reaction of meta-diisopropylbenzene on acid molecular sieves and synthesis of zeolites by a vapor phase transport method
… the acid form of the molecular sieves SAPO-5, mordenite, offretite, beta, hexagonal and cubic faujasite (hex and FAU), L, SAPO-37, and an amorphous silica-alumina at temperatures around 463 K in a flow-type fixed-bed reactor. A small amount of cracking is observed. The main reactions of …
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Methanol amination over hydrothermally treated zeolites RHO and Modernite
… certain forms of hydrothermally treated Mordenite can produce nonequilibrium product distributions. The performance of Rho can also be improved with hydrothermal treatment. The objectives of this study were briefly as follows. Firstly, the question was asked as to which of the catalysts …
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Carbon monoxide clean-up of reformate gas by preferential oxidation
… by increase the linear space velocity. A Pt-Fe/mordenite catalyst was prepared in this study using solid state ion exchange to deposit Fe and competitive ion exchange to deposit Pt. This method was proposed in order to try and improve the preparation method reported in literature. The …
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The impact of natural and synthetic zeolite when used in cementitious based systems
… mass in the mortar specimens with chabazite, mordenite, natrolite and philipsite chosen as a selection of natural zeolites. Ordinary Portland cement was used with a water-cement ratio of 0.40 and a sand-cement ratio of 1:3. All specimens were water-cured at 20°C before a suite of laboratory …
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An Experimental and Numerical Study on Metakaolin-based Geopolymers
… seeds (hydrogen faujasite, sodium faujasite, mordenite) were used. The results showed that all the zeolites could improve the strength of GPs although hydrogen faujasite and mordenite seemed to be more effective than sodium faujasite.
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THE STRATIGRAPHIC POSITION OF FOSSIL VERTEBRATES FROM THE POJOAQUE MEMBER OF THE TESUQUE FORMATION (MIDDLE MIOCENE, LATE BARSTOVIAN) NEAR ESPAÑOLA, NEW MEXICO
… analyses of claystones within lithosome B, mordenite was discovered, which is a zeolite mineral commonly found within volcanic rocks. This is significant because the presence of mordenite confirms Cavazza’s (1986) conclusion that lithosome B was sourced by the Taos Plateau–Latir volcanic …
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Mineralogy and geochemistry associated with hydrothermal alteration of a rhyolitic hyaloclastite from Ponza Island, Italy
… illite/smectite (I/S) with 10 to 85% I, mordenite, opal-C, and authigenic K-feldspar (akspar). The silicic zone is characterized by I/S with $\ge$90% I, pure illite, quartz, akspar, and occasional albite. In the sericitic zone the hyaloclastite altered primarily to illitic I/S with …
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Materials Characterization and Spectroscopy for a Methane Abatement Catalyst
… This study evaluates a specific copper-zeolite (mordenite) methane oxidation catalyst for long-term durability and potential performance at 400 and 950 C. Using materials characterization and spectroscopy techniques including scanning-electron microscopy (SEM), energy-dispersive X-ray …
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Binary gas adsorption on molecular sieves. Experimental data for the adsorption of oxygen, nitrogen and oxygen-nitrogen mixtures on five molecular sieve adsorbents at various temperatures and pressures and a comparison with theoretical models.
… mixtures on types 4A, 5A, 13X and Na-Mordenite molecular sieve pellets has been made. Pure component isotherms, using a volumetric apparatus, have been measured for each gas on each adsorbent at pressures up to 9 bar and for temperatures of 278.15,293.15 and 303.15 K. Curve fitting of …
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Catalytic, low temperature oxidation of methane into methanol over copper-exchanged zeolites
… for methane oxidation in copper-exchanged mordenite zeolites using tandem methane oxidation and Koch carbonylation reactions. Methoxy species migrate away from the copper active sites and adsorb onto Bronsted acid sites, signifying spillover on the zeolite surface. Second, a process is …
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Microwave effects on some zeolite catalysed reactions
… of toluene has been made using hydrogen forms of mordenite and ZSM-5 catalysts. The aim of this reaction is to make paraxylene which is then used in the production of terephthalic (1,4-benzenedicarboxylic) acid. This reaction has been studied under both microwave and thermal conditions at various …
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Simultaneous production of methanol and dimethylether from synthesis gas
… to DME follows the order ZSM-5 > Ferrierite > Mordenite ~ Beta ~ USY > H-Y. The strong Brönsted acid sites of ZSM-5 zeolites with relatively high Si/Al ratio represent the most active sites in methanol dehydration to DME reaction. However, the overall reactivity of the ZSM-5 zeolites is also …
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