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Title: Selective hydrogenation of cinnamaldehyde using palladium based bimetallic catalysts Pd-M/TiO2 (M=Cu, Ag and Au)
Authors: Saranya, A
Vivekanandan, G
Krishnamurthy, K R
Viswanathan, B
Keywords: Bimetallic Pd catalysts;Cinnamaldehyde hydrogenation;Nano scale alloys;Synergistic effect;Reactive hydrogen
Issue Date: Oct-2021
Publisher: NIScPR-CSIR, India
Abstract: 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 h 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 favourable 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.
Page(s): 1296-1302
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJC-A Vol.60A(10) [October 2021]

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