A search for alternative Deacon catalysts

Authors: Markus Hammes, Martin Valtchev, Marion B. Roth, Klaus Stöwe, Wilhelm F. Maier

Abstract:
High-throughput methods, emissivity-corrected infrared thermography (ecIRT) and a sequential 10-fold fixed bed gas phase reactor have been used to accelerate the development of new catalysts for the Deacon process (4 HCl + O₂ ⇋ 2 Cl₂ + 2H₂O). Both setups were modified to withstand the corrosive process conditions. Besides the reactor equipment also the catalysts themselves often suffered corrosion during the reaction. To consider the catalyst corrosion the tested oxides were typically aged for 24 h under a HCl-O₂ atmosphere at reaction temperature. The experimentally observed stability of selected binary mixedmetal oxides is correlated with literature data for the bulk chlorination tendency of the pure oxides and the corresponding melting/sublimation point of the chloride. The starting binary mixed-metal oxides have been selected based on a set of thermodynamic data for bulk chlorination and chloride oxidation and doping of TiO₂ and SnO₂, which are preferentially used as catalyst supports in Deacon reactions. The best catalysts discovered were optimized through doping and composition variations. Characterization of the best materials is provided.

Keywords:
Deacon catalyst
Chlorine
Production
Catalyst stability
Catalyst corrosion
High throughput
Emissivity corrected
IR-thermography

Published in: Applied Catalysis B: Environmental (Volumes 132–133, Pages 1-552, 27 March 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

A search for alternative Deacon catalysts

Bình luận của bạn

*

*

*

*

 Captcha

Gửi bình luận nhập lại