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Clarifying the interaction between cyclic oxime and acidic silanols in hierarchical SAPO-34 and AlPO-5 for the Beckmann rearrangement
Abstract: Caprolactam (CL) is a high-value chemical and precursor to nylon-6. Industrially, a harsh, liquid acid catalyst transforms C6-oxime to CL but due to the risk and inefficiency of the process, a solid-acid alternative is desirable. Whilst silicoaluminophosphates (SAPOs) have been successful in this domain, their small micropores suffer mass transport limitations. Hierarchically-porous (HP) SAPOs contain an auxiliary mesoporous network generated by soft-templating with surfactant. As well as improved mass transport, the synthesis introduces pendant silanols in the mesopores, with their own catalytic potential. Interestingly, earlier INS studies revealed the loss of oxime and catalyst O-H modes, indicating that the silanols can interact with oxime at low temperature, in a solid-state mixture. Our aim is to clarify the nature of these interactions and to investigate the loss of the O-H bands.
Principal Investigator: Professor Robert Raja
Experimenter: Dr Stephanie Richardson
Experimenter: Dr Alexander O'Malley
Experimenter: Professor Stewart Parker
DOI: 10.5286/ISIS.E.RB1710094
ISIS Experiment Number: RB1710094
Part DOI | Instrument | Public release date | Download Link |
---|---|---|---|
10.5286/ISIS.E.86390213 | TOSCA | 10 May 2020 | Download |
Publisher: STFC ISIS Neutron and Muon Source
Data format: RAW/Nexus
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Data Citation
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[author], [date], [title], [publisher],
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Professor Robert Raja et al; (2017): Clarifying the interaction between cyclic oxime and acidic silanols in hierarchical SAPO-34 and AlPO-5 for the Beckmann rearrangement , STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1710094
Data is released under the CC-BY-4.0 license.