Deactivation mechanism of the CVD Fe/Mo/DBH oxidation catalyst in CO{sub 2}
- Amoco Research Center, Naperville, IL (United States)
The Fe/Mo/DBH catalyst prepared from FeCl{sub 3}, MoO{sub 2}Cl{sub 2} and partially deboronated borosilicate molecular sieve (DBH) by the chemical vapor deposition method has been reported to exhibit novel catalytic gas phase O{sub 2} oxidations. Selective synthesis of terephthaldehyde from p-xylene, enhanced catalytic activity for terephthaldehyde formation in the presence of CO{sub 2} in the O{sub 2} stream, and preferential oxidation of p-xylene in the xylene isomer mixture containing ethylbenzene are among them. After a steady state level of catalytic activity was maintained for the gas phase CO{sub 2} in O{sub 2} oxidation of p-xylene to terephthaladehyde and p-tolualdehyde over CVD Fe/Mo/DBH for 55 hours, the oxidation was continued in CO{sub 2} by cutting off O{sub 2} to produce p-tolualdehyde for 45 hours. The spent catalyst resulting from the above run was consisted of three different color particles, namely white, orange and gray. These particles were separated by color and analyzed by the electron dispersion X-ray absorption spectroscopy (EDXS) and XRD. The catalytic activities of these particles were also evaluated for the p-xylene oxidation. These results led the deactivation mechanism of the CVD Fe/Mo/DBH catalyst in CO{sub 2}.
- OSTI ID:
- 215006
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Characterization and oxidation catalysis of alkylaromatics over CVD Fe/Mo borosilicate molecular sieve: Fe/Mo/DBH
Kinetics of carbon dioxide formation during catalytic oxidation of p-Xylene and of the products of its conversion