Guest-host interactions in sodium zeolite Y: structural and dynamical 23Na double-rotation NMR study of water, trimethylphosphine, molybdenum hexacarbonyl, and Mo(CO)4(PMe3)2 adsorption in Na56Y

1993 ◽  
Vol 115 (2) ◽  
pp. 563-568 ◽  
Author(s):  
Raz Jelinek ◽  
Saim Ozkar ◽  
Heloise O. Pastore ◽  
Andrej Malek ◽  
Geoffrey A. Ozin
Keyword(s):  
Zeolite Y ◽  
Molybdenum Hexacarbonyl ◽  
Host Interactions ◽  
Nmr Study

Double Rotation 23Na NMR Study of Guest-Host Interactions and Nanoscale Assemblies in Sodium Zeolite Y

1992 ◽  
Vol 277 ◽  
Author(s):  
R. Jelinek ◽  
S. Ozkar ◽  
G. A. Ozin
Keyword(s):  
Zeolite Y ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Molybdenum Hexacarbonyl ◽  
Guest Molecules ◽  
Host Interactions ◽  
Spin Lattice ◽  
Sodium Cations ◽  
Nmr Study ◽  
Relaxation Measurements

ABSTRACT23Na double rotation NMR (DOR) provides information on site-specific adsorption of guest molecules within the porous framework of sodium zeolite Y. Anchoring of molybdenum-hexacarbonyl to extraframework Na+ cations in particular locations within the large α-cavities is detected. Changes of the chemical environments of the Na+ cations are observed upon loading trimethylphosphine molecules. Spin-lattice relaxation measurements yield insight on dynamic aspects of the anchoring sodium cations.

scholarly journals Thermodynamics of Molybdenum Trioxide (MoO3) Encapsulated in Zeolite Y

2021 ◽  
Author(s):  
Xianghui Zhang ◽  
Andrew Strzelecki ◽  
Cody Cockreham ◽  
Vitaliy Goncharov ◽  
Houqian Li ◽  
...  
Keyword(s):  
Molybdenum Trioxide ◽  
Zeolite Y ◽  
Formation Enthalpy ◽  
Solution Calorimetry ◽  
Metal Species ◽  
Enthalpies Of Formation ◽  
Host Interactions ◽  
Oxide Melt ◽  
High Temperature Oxide ◽  
Temperature Oxide

Zeolites with encapsulated transition metal species are extensively applied in the chemical industry as heterogenous catalysts for favorable kinetic pathways. To elucidate the energetic insights into formation of subnano-sized molybdenum trioxide (MoO) encapsulated/confined in zeolite Y (FAU) from constituent oxides, we performed a systematic experimental thermodynamic study using high temperature oxide melt solution calorimetry as the major tool. Specifically, the formation enthalpy of each MoO/FAU is less endothermic than corresponding zeolite Y, suggesting enhanced thermodynamic stability. As Si/Al ratio increases, the enthalpies of formation of MoO/FAU with identical loading (5 Mo-wt%) tend to be less endothermic, ranging from 61.1 ± 1.8 (Si/Al = 2.9) to 32.8 ± 1.4 kJ/mol TO (Si/Al = 45.6). Coupled with spectroscopic, structural and morphological characterizations, we revealed intricate energetics of MoO – zeolite Y guest – host interactions likely determined by the subtle redox and/or phase evolutions of encapsulated MoO.

The oxidation of trimethylphosphine in zeolite Y: a solid-state NMR study

Langmuir ◽  
1989 ◽  
Vol 5 (4) ◽  
pp. 1026-1030 ◽  
Author(s):  
David J. Zalewski ◽  
Po Jen Chu ◽  
Pierre N. Tutunjian ◽  
Jack H. Lunsford
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Zeolite Y ◽  
Nmr Study

Solid-state NMR study of ultrastable zeolite Y modified with orthophosphoric acid

1993 ◽  
Vol 2 (3) ◽  
pp. 121-129 ◽  
Author(s):  
Waclaw Kolodziejski ◽  
Vicente Fornés ◽  
Avelino Corma
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Orthophosphoric Acid ◽  
Zeolite Y ◽  
Nmr Study

A study of nanostructure assemblies and guest-host interactions in sodium zeolite-Y using23Na double-rotation NMR

1991 ◽  
Vol 2 (4) ◽  
pp. 182-186 ◽  
Author(s):  
R Jelinek ◽  
A Pines ◽  
S Ozkar ◽  
G A Ozin
Keyword(s):  
Zeolite Y ◽  
Host Interactions

A solid-state NMR study of acid sites in zeolite Y using ammonia and trimethylamine as probe molecules

1987 ◽  
Vol 91 (8) ◽  
pp. 2091-2095 ◽  
Author(s):  
William L. Earl ◽  
Paul O. Fritz ◽  
Atholl A. V. Gibson ◽  
Jack H. Lunsford
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Zeolite Y ◽  
Acid Sites ◽  
Probe Molecules ◽  
Nmr Study

scholarly journals Thermodynamics of Molybdenum Trioxide (MoO3) Encapsulated in Zeolite Y

2021 ◽  
Author(s):  
Xianghui Zhang ◽  
Vitaliy Goncharov ◽  
Cody Cockreham ◽  
Houqian Li ◽  
Junming Sun ◽  
...  
Keyword(s):  
Molybdenum Trioxide ◽  
Zeolite Y ◽  
Formation Enthalpy ◽  
Solution Calorimetry ◽  
Catalytic Performance ◽  
Metal Species ◽  
Enthalpies Of Formation ◽  
Host Interactions ◽  
Oxide Melt ◽  
High Temperature Oxide

Zeolites with encapsulated transition metal species are extensively applied in the chemical industry as heterogenous catalysts for favorable kinetic pathways. To elucidate the energetic insights into formation of subnano-sized molybdenum trioxide (MoO3) encapsulated/confined in zeolite Y (FAU) from constituent oxides, we performed a systematic experimental thermodynamic study using high temperature oxide melt solution calorimetry as the major tool. Specifically, the formation enthalpy of each MoO3/FAU is less endothermic than corresponding zeolite Y, suggesting enhanced thermodynamic stability. As Si/Al ratio increases, the enthalpies of formation of MoO3/FAU with identical MoO3 loading tends to be less endothermic, ranging from 61.1 ± 1.8 (Si/Al = 2.9) to 32.8 ± 1.4 kJ/mol TO2 (Si/Al = 45.6). Coupled with spectroscopic, structural and morphological characterizations, and catalytic performance tests, we revealed intricate energetics of MoO3 – zeolite Y guest – host interactions and catalytic performance governed by the phase evolutions of encapsulated MoO3.

Formation Energetics and Guest—Host Interactions of Molybdenum Carbide Confined in Zeolite Y

2021 ◽  
Vol 60 (38) ◽  
pp. 13991-14003
Author(s):  
Xianghui Zhang ◽  
Margaret E. Reece ◽  
Cody B. Cockreham ◽  
Hui Sun ◽  
Baodong Wang ◽  
...  
Keyword(s):  
Molybdenum Carbide ◽  
Zeolite Y ◽  
Host Interactions
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