Selective hydrogenation of phenylacetylene to styrene on a Pd/TiO2 coating in a microreactor
| Autor: | Rebrov, E. V., Ángel Berenguer-Murcia, Skelton, H. E., Johnson, B. F. G., Schouten, J. C. |
|---|---|
| Přispěvatelé: | Chemical Reactor Engineering, Chemical Engineering and Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Zdroj: | Proceedings of the 10th International Conference on Microreaction Technology (IMRET-10), April, 06-10 2008, New Orleans, La, 83n-1/14 STARTPAGE=83n;ENDPAGE=1/14;TITLE=Proceedings of the 10th International Conference on Microreaction Technology (IMRET-10), April, 06-10 2008, New Orleans, La Scopus-Elsevier |
| Popis: | The selective hydrogenation of phenylacetylene to styrene by hydrogen was studied in the 25-50 oC temperature range in a continuous flow microchannel of 250 µm i.d. with a Pd supported on mesoporous TiO2 catalyst. The inner wall of the microreactor was dip-coated with a prehydrolyzed titania precursor solution containing an EOxPOyEOx amphiphilic triblock copolymer (EO = ethylene oxide, PO = propylene oxide, x = 106, y = 70) and suspended palladium nanoparticles with an average diameter of 4 nm. Solvent was withdrawn from the channel at a rate of 1 cm/s yielding a 120 nm continuous titania layer with a cubic mesostructure after drying and calcination. The organic copolymer was removed by calcination at 300oC under a residual pressure of 15 mbar. The coating porosity was 0.4, resulting in overall coating mass of 1.32 mg with a 1 wt.% Pd content. The liquid flow was varied between 1 and 10 µL/min and the hydrogen flow between 250 and 550 µL/min (STP). This corresponds to superficial velocities of 0.034-0.34 cm/s and 8-18 cm/s for liquid and gas, respectively. The maximum selectivity to styrene of 95 % was observed at a phenylacetylene conversion of 88%. The reaction rate in terms of TOF was found to be up to 2 s-1. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|