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Thermodynamics of Molybdenum Trioxide (MoO3) Encapsulated in Zeolite Y
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  • Xianghui Zhang,
  • Vitaliy Goncharov,
  • Cody Cockreham,
  • Houqian Li,
  • Junming Sun,
  • Hui Sun,
  • Xiaofeng Guo,
  • Hongwu Xu,
  • Su Ha,
  • Baodong Wang,
  • Yong Wang,
  • Di Wu
Xianghui Zhang
Washington State University
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Vitaliy Goncharov
Washington State University
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Cody Cockreham
Washington State University
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Houqian Li
Washington State University
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Junming Sun
Washington State University
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Hui Sun
East China University of Science and Technology
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Xiaofeng Guo
Washington State University
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Hongwu Xu
Los Alamos National Laboratory
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Su Ha
Washington State University
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Baodong Wang
National Institute of Clean and Low Carbon Energy
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Yong Wang
Washington State University
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Di Wu
Washington State University
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Abstract

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.

Peer review status:UNDER REVIEW

17 May 2021Submitted to AIChE Journal
19 May 2021Assigned to Editor
19 May 2021Submission Checks Completed
26 May 2021Reviewer(s) Assigned