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CHEMICAL AND PHYSICAL PROPERTIES OF MOLTEN SALTS RELATED TO THE SULFURIC ACID CATALYST

Objective


The project has been concerned with investigations of the fundamental and applied chemistry of the catalysts used for the technologically and economically important production of sulphuric acid and recently also for sulphur dioxide removal from power plant flue gasses. Industrial catalysts as well as the general molten salt gas model system M2S207/MHSO4/M2SO4/V2O5SO2/O2/SO3/N2 up to 600 C has been investigated by spectroscopic, thermal, electrochemical and X-rays methods. The research strategy of the partners involves in situ measurement on catalysts and metal melts using many different methods of investigations at the experimental operation, (ie at 400 to 600 C) and in contact with SO2/O2/SO3/N2 gas mixtures.

This strategy is in contrast to that traditionally employed where only a few methods are applied, usually on solidified systems at room temperature giving very limited information about the chemistry of the working catalyst.

Unique results have been obtained related to the unknown reaction mechanism and the severe deactivation of industrial catalysts. Promising compositions of modified catalysts are proposed that are active at lower temperatures.
The project concerns with the liquid-gas system M2S2O7/MKHSO4/V205- SO2/02/S03/N2 (M being NA, K, Cs) at 200-500 degree C which is a model of the alkali promoted catalyst used for the production of sulfuric acid. A multiinstrumental investigation on this sytem including measurements of the catalytical activity will be carried out under the conditions of industrial operation. The anticipated results are the elucidation of the unknown reaction mechanism and the factors leading to catalyst deactivation. On this basic a modified low temperature catalyst can hopefully be proposed.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

TECHNICAL UNIVERSITY OF DENMARK
Address
Anker Engelundsvej 1, Building 101
2800 Lyngby
Denmark

Participants (1)

Foundation for Research and Technology-Hellas
Greece
Address
Stadiou 18, Platani
26500 Patras