Characterization of carbon deposits on coked lithium phosphate catalysts for the rearrangement of propylene oxide

• Basic lithium phosphate catalysts can be easily deactivated due to carbon deposits.
• We mainly study the types and the decomposition of the carbon deposits.
• In-situ DRIFTS, TG–DTG, NMR and XPS were used to study carbon deposits.
• Results showed that the carbon deposits were mainly in the form of CxHy and CxHyO.
• The carbon deposits can be decomposed under certain conditions.

Basic lithium phosphate catalysts for the rearrangement of propylene oxide can be easily deactivated due to carbon deposits. In-situ DRIFTS, TG–DTG, NMR and XPS were used to study carbon deposits. Results showed that carbon deposits were mainly in the form of CxHy and CxHyO, which could be decomposed in a mixture of N2 and O2 atmosphere at higher than 300 °C or in N2 atmosphere near 500 °C. A shorter period of time was needed in the atmosphere containing O2.

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