Abstract
Steam dealkylation (SDA) and hydrodealkylation (HDA) of m-cresol were investigated at 460 °C under atmospheric pressure on potassium-promoted Rh/Al2O3 and Ni/Al2O3 catalysts. Potassium was used to inhibit acid-like reactions (isomerization and transalkylation ) very easily with cresol. The products were here essentially phenol and gases (H2, CO, CO2, CH4). Kinetic data were similar to those obtained with alkylbenzenes and the reaction mechanism was not basically changed by the presence of the OH substituent. However certain peculiarities were seen: firstly the SDA to HDA activity ratios were higher with cresol than with alkylbenzenes and secondly, phenol was a stronger reaction inhibitor for cresol dealkylation than benzene for alkylbenzene dealkylation. Potassium neutralized the acid sites of the support, increased the stability (less coke) and promoted dealkylation while ring opening was more or less unaffected.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
