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Published on: July 18, 2017
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Propane dehydrogenation over extra-framework In(i) in chabazite zeolites.
1Center for Catalytic Science and Technology, Department of Chemical and Biomolecular Engineering, University of Delaware Newark Delaware 19716 USA lobo@udel.edu.
Chemical Science
|April 6, 2022
Summary
Indium stabilized in zeolite CHA forms highly selective catalysts for propane dehydrogenation. This unique In+ species prevents deep reduction, enhancing stability and C3H6 selectivity compared to other supports.
Area of Science:
- Materials Science
- Catalysis
- Chemical Engineering
Background:
- Propane dehydrogenation (PDH) is crucial for producing light olefins.
- Developing stable and selective catalysts for PDH remains a challenge.
- The role of support materials in influencing metal catalyst performance is critical.
Purpose of the Study:
- To investigate the effect of support materials (silica, alumina, zeolite chabazite) on indium speciation.
- To understand how indium speciation influences catalytic performance in propane dehydrogenation.
- To explore the formation and stability of indium species within the CHA zeolite framework.
Main Methods:
- Incipient wetness impregnation of In(NO3)3 onto H-CHA, SiO2, and Al2O3 supports.
- Calcination and reduction treatments under H2 gas at 550 °C.
- Characterization using X-ray diffraction, H2-TPR, pulse reactor studies, and in situ FTIR spectroscopy.
- Catalytic testing for propane dehydrogenation, measuring conversion, selectivity, and activation energies.
Main Results:
- Indium oxide (In2O3) forms on external surfaces of H-CHA, while In+ species are stabilized within the zeolite framework upon reduction.
- Brønsted acid sites (BASs) in H-CHA facilitate In+ formation and prevent deep reduction to In(0).
- In-CHA exhibits superior stability and C3H6 selectivity (~85%) with lower dehydrogenation activation energy (94.3 kJ mol-1) compared to In2O3, In/SiO2, and In/Al2O3.
Conclusions:
- Zeolite chabazite (CHA) effectively stabilizes extra-framework In+ cations, crucial for enhanced PDH performance.
- The unique In+ species in In-CHA offers improved stability and selectivity, preventing over-reduction.
- Small-pore zeolites offer a promising platform for developing highly stable and selective catalysts for alkane dehydrogenation reactions.
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