Identification and Characterization of Zeolites Synthesized in the K2O-Al2O3-SiO2-H2O System

Sherman, John D.

doi:10.1021/bk-1977-0040.ch003

Cited by 27 publications

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“…Figure 7b (the purified 138-ft sample) shows only merlinoite crystals and minor amounts (< 10%) of an unidentified substance which might be a clay mineral. The merlinoite crystals are 10 ~m in length and exhibit the "wheatsheaf bundle" morphology typical of zeolite W synthetic merlinoite (see Sherman, 1977). …”

Section: Discussion and Geologic Applicationmentioning

confidence: 99%

“…Detailed comparisons of X-ray powder diffraction patterns for synthetic phases in the Na20-A1203-SiO2-H20 system by Taylor and Roy (1964) and for those in the K20-A1203-SiO2-H20 system by Sherman (1977) have greatly clarified the relations among synthetic Na-and K-zeolites. Little effort has been made, however, to clarify phase relations for zeolites in the combined Na20-K20-AlzO3-SiO2-H20 system.…”

Section: Introductionmentioning

confidence: 99%

“…Zeolite W was first synthesized by D. W. Breck in 1953(Sherman, 1977, and subsequently by many investigators (e.g., Burrer and Baynham, 1956;Milton, 1961;Taylor and Roy, 1964;Breck and Flanigen, 1968;Bosmans et al, 1973;Colella et al, 1977). Until 1977, zeolite W was thought to have the phillipsite structure.…”

Section: Introductionmentioning

confidence: 99%

“…Until 1977, zeolite W was thought to have the phillipsite structure. Based on differences in the X-ray powder diffraction patterns, Breck (1974) and Sherman (1977) Present address: Department of Geology, The University of Alabama, P.O. Box 1945, University, Alabama 35486.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Zeolites in the System Na₂O-K₂O-Al₂O₃-SiO₂-H₂O

Donahoe

Liou

Guldman

1984

Clays and clay miner.

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Abstraet--Zeolites having the structures of phillipsite, merlinoite, and gobbinsite were synthesized from clear solutions at 80~ in the system Na20-K20-Ai203-SiO2-H20 and their morphologies, cell parameters, and compositions determined. At 3.5 M silica concentration, the formation of merlinoite (synthetic zeolite W) is favored over the formation of phillipsite (synthetic zeolite ZK-19) by solution conditions of high pH (> 13.6) and low Na/(Na + K) ratios (<0.5).Using the information obtained from the synthesis experiments, the presence ofmerlinoite was predicted in sediments from Searles Lake, a saline, alkaline lake in California with ideal physiochemical conditions for its formation. Merlinoite was subsequently discovered to occur in tuffaceous sediments as part of an authigenic silicate zonation pattern from phillipsite -phillipsite + merlinoite ~ merlinoite ~ K-feldspar with increasing depth. Because of the close similarities in the physical properties of phillipsite and merlinoite, merlinoite may be much more common as an authigenic mineral than is currently realized.

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Section: Discussion and Geologic Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Zeolites in the System Na₂O-K₂O-Al₂O₃-SiO₂-H₂O

Donahoe

Liou

Guldman

1984

Clays and clay miner.

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“…In merlinoite, the framework has a statistical (Al, Si) distribution but the extra-framework cation and H 2 O distribution combined with the cation bonding to the framework reduces the symmetry to orthorhombic (Galli et al, 1979). Merlinoite has a synthetic counterpart named zeolite W (Sherman, 1977;Bieniok et al, 1996;Skofteland * E-mail: rosamicaela.danisi@libero.it DOI: 10.1180/minmag.2015.079.1.15 Mineralogical Magazine, February 2015, Vol. 79(1), pp.…”

Section: Introductionmentioning

confidence: 99%

Structural intergrowth of merlinoite/phillipsite and its temperature-dependent dehydration behaviour: a single-crystal X-ray study

2015

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Supposed 'merlinoite' crystals from Monte Somma, Vesuvius (Italy) and Fosso Attici, north of Rome (Italy) represent highly twinned coherent intergrowths between merlinoite and phillipsite on a submicroscopic level. = 124.8º) frameworks of similar composition are assembled from identical tetrahedral units, though with a different connectivity. Coherent intergrowth and twinning of the two frameworks lead to P4 2 /mnm pseudosymmetry, which is diagnostic of the intergrowth. Under ambient conditions merlinoite has Immm symmetry or I4/mmm if twinned. A low-symmetry model of space group P12 1 /m1 (a &14.2, b & 14.2, c & 10 Å , b = 90º) allows structure refinement and quantification of the two frameworks.Upon in situ dehydration to 250ºC the evolution of the unit-cell volume of the Monte Somma merlinoite/phillipsite intergrowth displays an intermediate trend between previously studied pure merlinoite from the Khibiny massif (Russia) and Ba-rich phillipsite.The Monte Somma crystal studied by temperature-dependent single-crystal X-ray diffraction methods also contained a subordinate chabazite inclusion with no coherent structural relationship to the merlinoite/phillipsite framework. Thus, the modification of the chabazite framework on dehydration could also be studied.

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The Origin of Selective Adsorption of CO₂ on Merlinoite Zeolites

Choi

Min

et al. 2020

Angewandte Chemie

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The CO2 adsorption behavior at 25–75 °C and 0–1.0 bar of various alkali cation‐exchanged forms of merlinoite (framework type MER) zeolites with Si/Al=2.3 and 3.8 is described. The adsorption isotherms at 25 °C on the Na+, K+, Rb+, and Cs+ forms of MER zeolite with Si/Al=2.3 are characterized by a clear step, the CO2 pressure of which differs notably according to the type of their extraframework cations. Structural analysis shows that CO2 adsorption on the former three zeolites includes the relocation of gating cations with high site occupancy and the remarkable concomitant structural breathing. We define this unusual adsorption phenomenon as a cooperative cation gating‐breathing mechanism. The overall results suggest that the actual mechanism of selective CO2 adsorption on intermediate‐silica small‐pore zeolites can change from cation gating to cooperative cation gating‐breathing to breathing, depending on a combination of their topological and compositional flexibilities.

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Identification and Characterization of Zeolites Synthesized in the K₂O-Al₂O₃-SiO₂-H₂O System

Cited by 27 publications

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Synthesis and Characterization of Zeolites in the System Na₂O-K₂O-Al₂O₃-SiO₂-H₂O

Synthesis and Characterization of Zeolites in the System Na₂O-K₂O-Al₂O₃-SiO₂-H₂O

Structural intergrowth of merlinoite/phillipsite and its temperature-dependent dehydration behaviour: a single-crystal X-ray study

The Origin of Selective Adsorption of CO₂ on Merlinoite Zeolites

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Identification and Characterization of Zeolites Synthesized in the K2O-Al2O3-SiO2-H2O System

Cited by 27 publications

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Synthesis and Characterization of Zeolites in the System Na2O-K2O-Al2O3-SiO2-H2O

Synthesis and Characterization of Zeolites in the System Na2O-K2O-Al2O3-SiO2-H2O

Structural intergrowth of merlinoite/phillipsite and its temperature-dependent dehydration behaviour: a single-crystal X-ray study

The Origin of Selective Adsorption of CO2 on Merlinoite Zeolites

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Identification and Characterization of Zeolites Synthesized in the K₂O-Al₂O₃-SiO₂-H₂O System

Synthesis and Characterization of Zeolites in the System Na₂O-K₂O-Al₂O₃-SiO₂-H₂O

Synthesis and Characterization of Zeolites in the System Na₂O-K₂O-Al₂O₃-SiO₂-H₂O

The Origin of Selective Adsorption of CO₂ on Merlinoite Zeolites