In-Situ Loading of Noble Metal Nanoparticles on Hydroxyl-Group-Rich Titania Precursor and Their Catalytic Applications

Abstract

A novel in-situ route was developed to load well-dispersed palladium (Pd) nanoparticles on the surface of hydroxyl-group-rich titania precursor. Pd nanoparticles are formed by in-situ reduction of Pd(II) by Sn(II); the latter is linked to the surface of TiO 2 precursors through inorganic grafting. The initial Pd nanoparticles then serve as seed for subsequent particle growth and allow us to systematically control the amount and size of the Pd nanoparticles by varying the amount of added PdCl 2 . The Pd nanoparticles, with no protection from ligands, are well-dispersed on the TiO 2 precursor surface without aggregation even at a high Pd loading of 22.5 wt %. The method is also extended to introduce other noble metal nanoparticles including Au, Ag, Pt, and their bimetallic nanoparticles onto the TiO 2 precursor surface. The as-obtained TiO 2 precursor-Pd composite is a promising catalyst in nanocatalysis. As an example, the TiO 2 precursor-Pd shows high catalytic activity for Suzuki cross-coupling reaction and can be recycled multiple times without loss of activity.

In situ loading of Cu2O nanoparticles on a hydroxyl group rich TiO2 precursor as an excellent catalyst for the Ullmann reaction

“…A large Scheme 1 Schematic procedure for loading Cu 2 O nanoparticles on the surface of TiO 2 precursor number of hydroxyl groups are present on the surface of the TiO 2 precursor spheres. The presence of these hydroxyl groups was confirmed by FTIR in our previous work [21]. A TEM image of the TiO 2 precursorCu 2 O composite (with 7.76 wt% of Cu 2 O) can be seen in Fig.…”

“…We have previously reported [21] an in situ method to load pure noble metals (Pd, Au, Ag, and Pt) nanoparticles onto hydroxyl group rich TiO 2 precursor spheres. The noble metal nanoparticles are very small and are highly dispersed on the TiO 2 precursor surface.…”

Room-temperature isomerization of 1-butene to 2-butene over palladium-loaded silica nanospheres catalyst

“…For supported Pd catalyst, there is a strong synergistic interaction between noble metal nanoparticles and support, which can greatly enhance the catalytic activity and selectivity [28,29], and the different catalytic activities resulted from supports, which could be partly explained by their corresponding Zeta potentials of those catalysts (shown in Fig. 2a).…”

Silver Nanoparticles

“…Another mechanism involves the association of silver with oxygen and its reaction with sulfhydryl groups on the cell wall to form R-S-S-R bonds, thereby blocking respiration and causing cell death (Kumar et al 2004). (Zhong et al 2007;Wei et al 2007;Jia et al 2008). Silver nanoparticles can be exploited in medicine and pharmacy for dental materials, burn treatments, coating stainless steel materials, textile fabrics, and sunscreen lotions (Duran et al 2007).…”