Selective hydrogenation of cinnamaldehyde using palladium based bimetallic catalysts Pd-M/TiO2 (M=Cu, Ag and Au)

A, Saranya ; G, Vivekanandan ; KR, Krishnamurthy R; B, Viswanathan


Pd based bimetallic catalysts, Pd-M, (M=Cu, Ag, and Au) supported on TiO2 P-25, have been prepared by chemical reduction with glucose and characterized by XRD, TEM, XPS, DRS, TPR and H2TPD. Activity for the conversion of cinnamaldehyde (CAL) and selectivity to hydro-cinnamaldehyde (HCAL), cinnamyl alcohol (COL) and hydrocinnamyl alcohol (HCOL) have been evaluated in the temperature range of 120-140°C for 1 hr and 10 bar hydrogen pressure. For comparison, monometallic Cu, Ag and Au (1% w/w in each case) catalysts supported on TiO2 P-25 have been prepared and evaluated. DRS and XPS studies reveal nanoscale alloy formation and re-distribution of charges in bimetallic catalysts. Bimetallic Pd-Cu displays higher CAL conversion compared to Pd-Ag and Pd-Au. Besides the favorable electronic and ensemble effects, availability of reactive hydrogen on Pd-Cu, as revealed by the lowest hydrogen desorption temperature, is an additional factor that contributes towards the higher activity of Pd-Cu. Bimetallic catalysts are stable up to five reaction cycles, without any loss of Pd or structural integrity.


Bimetallic Pd catalysts, cinnamaldehyde hydrogenation, nano scale alloys, synergistic effect, reactive hydrogen.

Full Text: PDF (downloaded 555 times)


  • There are currently no refbacks.
This abstract viewed 1099 times