TY - JOUR
T1 - Elucidation of surface active sites by formic acid adsorbed IR studies in the hydrogenation of levulinic acid to valeric acid over rare earth metal doped titania supported nickel catalysts
AU - Peddakasu, Ganga Bhavani
AU - Velisoju, Vijay Kumar
AU - Gutta, Naresh
AU - Medak, Sudhakar
AU - Dumpalapally, Mahesh
AU - Akula, Venugopal
N1 - Generated from Scopus record by KAUST IRTS on 2023-10-23
PY - 2021/9/1
Y1 - 2021/9/1
N2 - Titania supported Ni catalyst modified by different lanthanides (La, Ce, Pr and Nd) were evaluated for the one-step conversion of levulinic acid (LA) to valeric acid (VA) using formic acid as a hydrogen source. Among these, the La modified Ni/TiO2 demonstrated better VA yields with an optimum LA to VA mole ratio of 1:3. Pyridine and/or formic acid adsorbed IR studies revealed that presence of weak Lewis and strong basic sites present on the Ni-La/TiO2 surface was the reason for higher VA selectivity. The physicochemical characteristics of the modified Ni-M/TiO2 (M = La, Ce, Pr and Nd) catalysts deduced from H2-TPR, N2O titration, TPD of NH3 and catalytic activity data emphasized a combination of metallic Ni with surface acid-base sites were responsible for the formation of VA in single step. Using aqueous γ-valerolactone, 99 % selectivity towards VA was achieved. A plausible reaction mechanism has been proposed based on the kinetic data obtained at moderate temperatures and ambient pressures.
AB - Titania supported Ni catalyst modified by different lanthanides (La, Ce, Pr and Nd) were evaluated for the one-step conversion of levulinic acid (LA) to valeric acid (VA) using formic acid as a hydrogen source. Among these, the La modified Ni/TiO2 demonstrated better VA yields with an optimum LA to VA mole ratio of 1:3. Pyridine and/or formic acid adsorbed IR studies revealed that presence of weak Lewis and strong basic sites present on the Ni-La/TiO2 surface was the reason for higher VA selectivity. The physicochemical characteristics of the modified Ni-M/TiO2 (M = La, Ce, Pr and Nd) catalysts deduced from H2-TPR, N2O titration, TPD of NH3 and catalytic activity data emphasized a combination of metallic Ni with surface acid-base sites were responsible for the formation of VA in single step. Using aqueous γ-valerolactone, 99 % selectivity towards VA was achieved. A plausible reaction mechanism has been proposed based on the kinetic data obtained at moderate temperatures and ambient pressures.
UR - https://linkinghub.elsevier.com/retrieve/pii/S0920586120305289
UR - http://www.scopus.com/inward/record.url?scp=85089298395&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2020.07.054
DO - 10.1016/j.cattod.2020.07.054
M3 - Article
SN - 0920-5861
VL - 375
SP - 112
EP - 119
JO - Catalysis Today
JF - Catalysis Today
ER -