Abstract
Abstract The transesterification of dimethyl oxalate (DMO) with phenol to produce methyl phenyl oxalate (MPO) and diphenyl oxalate (DPO) was carried out over TiO 2 /SiO 2 catalyst. The evaluation results showed that TiO 2 /SiO 2 had better activity and excellent selectivity to target products compared with many conventional ester exchange catalysts. The total selectivity to MPO and DPO kept about 99.0% over TiO 2 /SiO 2 and the conversion of DMO was 66.7% at 10% Ti loading, which was the maximum at different Ti loading. The structure and the chemical state of titanium species in TiO 2 /SiO 2 had been investigated by XRD and XPS. The surface Ti(IV) species in the form of a monolayer was dominant until 6% Ti loading, while crystalline TiO 2 was detected at 8% Ti loading. IR of adsorbed pyridine and NH 3 -TPD characterization indicated that the desirable catalytic activity of TiO 2 /SiO 2 could be ascribed to its weak Lewis acid. Lewis acid sites cooperated with TiO 2 to catalyze the synthesis of MPO and DPO.
Sign-in/Register to access full text options 
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.
