Silicalite, a new hydrophobic crystalline silica molecular sieve

Flanigen, Edith M.; Bennett, J. M.; Grose, Robert W.; Cohen, Jayson; Patton, R. L.; Kirchner, Richard M.; Smith, J. V.

doi:10.1038/271512a0

Cited by 1,232 publications

(624 citation statements)

References 5 publications

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“…filled with the packing material to within 6 00 of the stub ends of the U. The traps were filled with either silicalite (Flanigen et al, 1978) or molecular sieve 5A. Silicalite (now available from UOP Molsiv Adsorbents as HISIV 3000) is a hydrophobic crystalline silica molecular sieve that has been reported to absorb hydrocarbons and low molecular weight organic compounds from water-saturated gas streams at room temperature.…”

Section: Methane Trapsmentioning

confidence: 99%

Stable carbon and hydrogen isotope measurements on Black Sea water-column methane

Reeburgh

Tyler

Carroll

2006

Deep Sea Research Part II: Topical Studies in Oceanography

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We report measurements of d 13 C-CH 4 and d 2 H-CH 4 at a central station in the Black Sea. We considered the Black Sea as a ''biogeochemical bucket'' and the single station as a basin-wide integrator of processes affecting methane. Considering the rapid (3.6-18 yr) turnover of methane and the similarity of these stable isotope distributions to the methane concentration and oxidation rate profiles [Reeburgh, Ward, Whalen, Sandbeck, Kilpatrick, Kerkhof, 1991. Black Sea methane geochemistry. Deep-Sea Research 38, S1189-S1210], it appears that methane is being added approximately as fast as it is being oxidized. Methane can be thought of as ''running in place'' in the Black Sea water column.Recent reports of extensive vents on the northern side of the Black Sea suggest that they might be a methane source capable of effectively balancing the Black Sea methane budget. Unfortunately, we have limited information on basin-wide seep fluxes and cannot identify them with stable isotope measurements. Methane oxidation (and accompanying isotope fractionation) is so extensive that the water-column stable isotope measurements provide little information on methane sources. Future measurements of 14 C-CH 4 should permit partitioning Black Sea methane sources into fossil and recent components. r

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Section: Methane Trapsmentioning

confidence: 99%

Stable carbon and hydrogen isotope measurements on Black Sea water-column methane

Reeburgh

Tyler

Carroll

2006

Deep Sea Research Part II: Topical Studies in Oceanography

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“…Recently, solid-state chemists have concentrated in direct synthesis of all-silica zeolites (Si:Al = ∞). [13,14] Recent reports, both experimental and theoretical, show that intrusion of liquid water inside these hydrophobic materials is indeed possible at pressures in the 50-200 MPa range. [15,16] These pure SiO2 crystalline materials can thus be considered as models of regular porous networks for studying the pure confinement effect since no aluminium atom in the structure nor extra-framework cations specifically interact with the adsorbed phase.…”

Section: Introductionmentioning

confidence: 99%

Confinement effect on the hydrated electron behaviour

Coudert

Boutin

2006

Chemical Physics Letters

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We report the first direct simulation of an excess hydrated electron confined in a zeolite nanopore by means of mixed quantum-classical molecular dynamics. The experimental dependence of the hydrated electron absorption spectrum maximum upon water loading in faujasites is reproduced. The diffusion of the confined hydrated electron is also studied and a prediction of the diffusion coefficient is provided.

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“…The aim of this work was to investigate whether hydroxides of the composition M(OH) 2 could replicate the chemistry seen with SiO 2 in highly siliceous zeolites, such as MFI silicalite 32 and siliceous ZSM-12 (MTW topology) 33 . The high levels of beryllium present in the frameworks found in this work, Table 1, leads to OH − :O 2 − ratios greater than unity, such that the stoichiometry of each of these frameworks tends towards a nanoporous polymorph of Be(OH) 2 .…”

Section: Discussionmentioning

confidence: 99%

Lightweight nanoporous metal hydroxide-rich zeotypes

Littlefield

Weller

2012

Nat Commun

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nanoporous materials have important industrial applications as molecular sieves, catalysts and in gas separation and storage. They are normally produced as moderately dense silicates (sio 2 ) and aluminosilicates making their specific capacities for the uptake and storage of gases, such as hydrogen, relatively low. Here we report the synthesis and characterization of lightweight, nanoporous structures formed from the metal hydroxide Be(oH) 2 in combination with relatively low levels of framework phosphate or arsenate. Three new zeotype structures are described, constructed mainly of Be(oH) 4 tetrahedra bridged through hydroxide into threemembered rings; these units link together to produce several previously unknown zeotype cage types and some of the most structurally complex, nanoporous materials ever discovered. These materials have very low densities between 1.12 and 1.37 g cm − 3 and theoretical porosities of 63-68% of their total volume thereby yielding very high total specific pore volumes of up to 0.60 cm 3 g − 1 .

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Silicalite, a new hydrophobic crystalline silica molecular sieve

Cited by 1,232 publications

References 5 publications

Stable carbon and hydrogen isotope measurements on Black Sea water-column methane

Stable carbon and hydrogen isotope measurements on Black Sea water-column methane

Confinement effect on the hydrated electron behaviour

Lightweight nanoporous metal hydroxide-rich zeotypes

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