Combustion synthesized vanadia rods for environmental applications

Abstract

Wiley Online Library (wileyonlinelibrary.com).Rod-shaped V 2 O 5 was synthesized using the solution combustion technique, and the morphology of the compound was confirmed by TEM. Rods of an average diameter of 500 nm and length 3-6 times the diameter were obtained after the calcination of freshly prepared V 2 O 5 at 550 C for 24 h. Pd metal nanoparticles of 20 nm size were deposited onto the rods using the wet impregnation technique. The as-synthesized, calcined and Pd impregnated V 2 O 5 were characterized by a wide variety of techniques including energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. These compounds were tested for CO oxidation, adsorption, and photocatalytic degradation of dyes. The 1% Pd/V 2 O 5 showed a high activity for CO oxidation, the as-synthesized compound showed activity for the adsorption of cationic dyes, whereas the calcined V 2 O 5 sample showed high rates of photocatalytic degradation of dyes.

Nanomaterials via solution combustion synthesis: a step nearer to controllability

“…The TEM image (Fig. 80 V 2 O 5 rods were also synthesized by SCS combined with a subsequent annealing at 550 C for 24 h. 81 Chen et al also obtained Sn 1Àx RE x O 2Àx/2 (RE ¼ Y, La, Gd and Nd) nanorods by annealing the as-synthesized products from a microwaveinduced KCl-assisted SCS. Just like other template-assisted synthesis methods, the (Fig.…”

“…Interestingly, one-dimensional nanostructures can sometimes be obtained by annealing the preformed nanoparticles derived form SCS. [80][81][82] For example, Ding et al obtained CaIn 2 O 4 nanorods (Fig. 3f) by SCS combined with a high-temperature post-annealing.…”

“…The formation of rods was believed to be related to the asymmetric crystal structure of CaIn 2 O 4 and the instantaneous high temperature involved in the combustion. 80 V 2 O 5 rods were also synthesized by SCS combined with a subsequent annealing at 550 C for 24 h. 81 Chen et al also obtained Sn 1Àx RE x O 2Àx/2 (RE ¼ Y, La, Gd and Nd) nanorods by annealing the as-synthesized products from a microwaveinduced KCl-assisted SCS. 82 The diameter and length of the nanorods is 8-12 nm and 100-200 nm, respectively.…”

Analysis of oxide and vanadate supports for catalytic hydrogen combustion: Kinetic and mechanistic investigations

“…42 We have previously tested the activity of V 2 O 5 for CO oxidation, and conversions were obtained only on impregnation of Pd. 43 Surface reconstructions with the introduction of Pd and lattice oxygen exchange were found to be responsible for high activity of the catalyst at high temperatures. In vanadates of the type MVO 4 , where M is a transition or rare earth metal with variable valance, redox couples and electron exchanges between M, V and the reactant species can be expected and, therefore, vanadates can prove to be better supports compared to V 2 O 5 .…”

Facile solution combustion synthesis of monoclinic VO2: a unique and versatile approach

“…The initial objective of the research was to prepare a V 2 O 5 nanopowder through a combustion process which had not been employed much. 14 Though we have succeeded in our objective to produce V 2 O 5 through a combustion process quite similar to that used for other materials, it was the observation of the intermediate state of the smouldering product VO 2 @C having a blue-black colour that created much curiosity. We thus investigated the nature and composition of this product systematically.…”