Electrospinning of palladium/silica nanofibers for catalyst applications

Abstract

A new inorganic supported catalyst of silica (SiO2)-supported palladium (Pd) nanofibers was successfully fabricated by the electrospinning followed by the calcination at high temperature and the reduction in H2 atmosphere.

Preparation of Rh–SiO2 fiber catalyst with superior activity and reusability by electrospinning

“…The results in Table 3 show that the Rh-SiO 2 ber catalyst exhibits excellent catalytic activity in the catalytic hydrogenation of alkenes with different structures at mild reaction conditions. In our previous study, the Pd-SiO 2 ber catalyst, on which the Pd NPs with an average diameter of 20-30 nm supported, exhibited excellent activity in the hydrogenation of acrylic acid at the reaction conditions of 70 C, hydrogen pressure of 2.5 MPa, and 5 h. 35 However, the present Rh-SiO 2 ber catalyst exhibited excellent activity even at the reaction conditions of 30 C, hydrogen pressure of 1 MPa, and 30 min, suggesting the superior activity of the Rh-SiO 2 ber catalyst. S4-S8 (ESI †), we can see that the proton peaks for the double bonds of the alkenes disappear aer the hydrogenation reaction and the intensity of the alkyl peaks increases, suggesting the successful hydrogenation of the alkenes.…”

“…2 (ESI †), the FTIR spectrum of PVP shows characteristic peaks of about 1658 cm À1 , 1300-1500 cm À1 , and 1290 cm À1 for C]O stretching, C-H bending, and C-N stretching, respectively. The DTG peak at 342 C in the fourth stage and the DTG peak at 376 C in the h stage correspond to the complete decomposition of PVP, 35,43 and the weight loss between 400 C and 800 C is assigned to the release of water formed by the condensation of hydrolyzed TEOS in the PVP-RhCl 3 -SiO 2 bers. The relative intensity of the peak 1290 cm À1 also decrease, suggesting that the chemisorption of Rh on O atoms should greatly weaken or even break the N-C bond of PVP.…”

“…However, in the spectrum of the PVP-RhCl 3 -SiO 2 bers, the peak for C]O stretching red shi from 1658 cm À1 to 1647 cm À1 , and the relative intensity of the peaks between 1300-1500 cm À1 for C-H bending decrease, indicating the chemisorption of Rh ions on the O atoms of PVP. 35,43 The element composition of the obtained Rh 2 O 3 -SiO 2 bers (Table 2 The morphology and size of the Rh-SiO 2 bers were examined by SEM and HRTEM, and representative electron microscopy images of the Rh-SiO 2 bers are shown in Fig. 40 The peaks of 1658 cm À1 , 1300-1500 cm À1 , and 1290 cm À1 disappear aer calcination, suggesting the removal of organic components aer calcination.…”

“…35 To the best of our knowledge, there is scarcely any report about the electrospun nanobers with rhodium (Rh) NPs, 28 especially in the catalytic hydrogenation. 35 To the best of our knowledge, there is scarcely any report about the electrospun nanobers with rhodium (Rh) NPs, 28 especially in the catalytic hydrogenation.…”

Pd/Fe3O4 Nanofibers for the Catalytic Conversion of Lignin-Derived Benzyl Phenyl Ether under Transfer Hydrogenolysis Conditions

“…Indeed, the electrospun fibers show excellent features such as nanosize, mesoporous nanostructure, large specific surface area, and controllable morphology. These features make the nanofibers a promising and attractive candidate for catalyst support because they can provide more active sites for the catalyst, thus improving the catalytic efficiency [5]. Moreover, the electrospinning technique offers a simple and versatile route to immobilize metal particles in submicron-sized fibers improving the operational stability of samples when used, for example, in plug-flow reactors.Recently different nanofibers have been proposed for different catalytic applications [17].…”