Effect of vanadium dispersion and of support properties on the catalytic activity of V-containing silicas - Sorbonne Université Access content directly
Journal Articles Catalysis Today Year : 2011

Effect of vanadium dispersion and of support properties on the catalytic activity of V-containing silicas

Abstract

Two V-SBA-15 and V-MCF materials (containing about 2.5 wt.% vanadium) were prepared by direct synthesis and tested as catalysts in the decomposition of the most stable chlorinated-alkane, dichloromethane (a total oxidation reaction) and in the oxidative dehydrogenation (ODH) of propane (a partial oxidation reaction). Comparison was made with: (i) two V-SBA-15 and V-MCF materials prepared by "traditional" impregnation method and (ii) a non-porous V-SiO2 catalyst prepared by flame pyrolysis. All catalysts tested had a vanadium content of about 2.5 wt.%. Samples properties were investigated by means of complementary techniques (TEM, IR and DR UV-vis spectroscopies, N2 sorption at −196 ◦C) in order to find possible correlations between catalytic properties of the studied materials and their different physico-chemical features. It is shown that direct synthesis allows a better vanadium dispersion to be achieved, a feature that positively affects catalytic performances in both total and partial oxidations. The different porous networks of the SBA-15 and MCF supports also play an important role on catalytic activity: both V-SBA-15 samples gave better results in dichloromethane decomposition, whereas both V-MCF samples were more selective in propane ODH. The latter findings are ascribed to different molecules diffusion and residence time inside the channels of either SBA-15 or MCF networks.

Dates and versions

hal-00687622 , version 1 (13-04-2012)

Identifiers

Cite

Marco Piumetti, Barbara Bonelli, Pascale Massiani, Stanislaw Dzwigaj, Ilenia Rossetti, et al.. Effect of vanadium dispersion and of support properties on the catalytic activity of V-containing silicas. Catalysis Today, 2011, 179, pp.140-148. ⟨10.1016/j.cattod.2011.06.028⟩. ⟨hal-00687622⟩
89 View
0 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More