Abstract
TiO2 fiberswere prepared through electrospinning of poly methyl methacrylate (PMMA)and titaniumisopropoxide (TIP) solution
followed by calcination of fibers in air at 500∘C. Cetyltrimethylammonium bromide (CTAB) protected palladium nanoparticles
(Pd NPs) prepared through reduction method were successfully adsorbed on the TiO2 nanofibers (NF). Combined studies of
X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) indicated that the
synthesized Pd/TiO2 had anatase. BET indicated that the synthesized TiO2 and Pd/TiO2 had a surface area of 53.4 and 43.4m2/g,
respectively.The activity and selectivity of 1mol% Pd/TiO2 in the Heck reaction have been investigated towards theMizoroki-Heck
carbon–carbon cross-coupling of bromobenzene (ArBr) and styrene. Temperature, time, solvent, and base were optimized and
catalyst was recycled thrice. 1H NMR and 13C NMR indicated that stilbene, a known compound from literature, was obtained in
various Heck reactions at temperatures between 100∘C and 140∘C but the recyclability was limited due to some palladium leaching
and catalyst poisoning which probably arose from some residual carbon from the polymer. The catalyst was found to be highly
active under air atmosphere with reaction temperatures up to 140∘C. Optimized reaction condition resulted in 89.7% conversions
with a TON of 1993.4 and TOF value of 332.2 hr−1.