| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 54907 | Catalysis Today | 2013 | 8 Pages |
The present study investigates the dehydrogenation of n-butane over mono (Cr or V) and bimetal (Cr-V) loaded MCM-41 catalysts. Wet impregnation technique was used, where the metal content maintained around 4 wt.%. The unique properties of bimetal supported catalysts were evaluated by means of XRD, N2 adsorption, and temperature programmed analysis H2-TPR and NH3-TPD. The mixed oxides Cr and V impregnated MCM-41 was tested for dehydrogenation of n-butane at different temperatures ranging 525–600 °C. The catalytic evaluation shows that Cr content of 1.2 wt.% and V content of 2.8 wt.% over MCM-41 designated as 1.2Cr2.8V/M-41 exhibited the highest butane conversion of 20.1% and butenes selectivity of 88.5% at 600 °C. Monometallic forms synthesized through hydrothermal (Cr-MCM-41) and impregnation route (3.5 wt.%Cr/MCM-41 and 3.8 wt.%V/MCM-41) were found to be less active for the dehydrogenation reaction. In the presence of CO2, the stability of 1.2Cr2.8V/M-41catalyst improved with n-butane conversion of 8.2% at 10 min to 6.5% at 180 min. The improved performance of bimetal catalysts can be correlated to synergetic effect of uniformly dispersed Cr-V-O mixed oxides over MCM-41, high reducibility and surface acidity.
Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (142 K)Download as PowerPoint slideHighlights► Dehydrogenation of n-butane investigated over Cr, V and bimetal (Cr-V)/MCM-41 catalysts. ► Cr-V impregnated MCM-41 exhibited high reducibility. ► The increased surface acidity shows the stronger interaction of mixed oxides over support than that of the mono metal oxide supported catalysts. ► 1.2Cr2.8V/M-41 exhibited the highest butane conversion of 20.1% and butenes selectivity of 88.5% at 600 °C. ► The activity can be correlated to synergetic effect of uniformly dispersed Cr-V-O mixed oxides over MCM-41.
