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Preparation, physiochemical and kinetic investigations of V2O5/SiO2 catalyst for sulfuric acid production

Tavassoli, A ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. Publisher: Materials and Energy Research Center , 2016
  3. Abstract:
  4. V2O5/SiO2 catalyst utilized to oxidize the SO2 to SO3 species in the presence of oxygen mainly for producing sulfuric acid. For this catalyst, the active phase was a mixture of vanadium pentoxide and basic sulfate/pyrosulfate material. This active phase at the reaction temperature behaved as a liquid filling up the pores of the silica support. On the other hand, amounts of the SO3 and V5+ species in the catalyst necessarily varied with the concentration of the feed material and temperature rendering complexity to the kinetics of the SO2 oxidation reaction. In the current research, the catalyst preparation with different amounts of such materials was undertaken. Purified Diatomaceous earth of a Persian Gulf beach was chosen as the support for this catalyst. The suitability of the prepared catalyst to determine the reaction kinetics was confirmed through the XRD, XRF and BET-BJH methods as well as color analysis. Moreover, the aforementioned reaction kinetics studied empirically. In addition, a model of the reaction rate using the response surface methodology (RSM) was presented. In this venue, factors including the reaction temperature as well as conversion were considered. This reaction kinetics determined at the operating conditions of 380-420°C, 0.108MPa and feed gas composition of 10wt.% SO2, 18.9wt.% O2 and 71.1wt.% N2. It was revealed that, obtained kinetic rate constants satisfied the Arrhenius relationship from which the activation energies were determined
  5. Keywords:
  6. Activation energy ; Association reactions ; Catalysts ; Kinetics ; Oxidation ; Rate constants ; Sulfur dioxide ; Sulfuric acid ; Vanadium ; Vanadium compounds ; Arrhenius relationship ; Catalyst preparation ; Feed gas composition ; Kinetic investigations ; Kinetic rate constants ; Response surface methodology ; Temperature renderings ; Vanadium pentoxide ; Reaction temperature ; Catalyst supports ; Reaction kinetics
  7. Source: International Journal of Engineering, Transactions B: Applications ; Volume 29, Issue 11 , 2016 , Pages 1478-1488 ; 1728144X (ISSN)
  8. URL: http://www.ije.ir/abstract/%7BVolume:29-Transactions:B-Number:11%7D/=2377