To develop a system which integrates catalytic chemical reactions with efficient heat transfer for process intensification.
A superclaus catalyst was deposited on a silica layer, which was put on the surface by a new method. Silica suspension was brought into the matrix after which it was dried. The resulting layer was about 5 um thick and covered the metal surface completely.
The conversion, selectivity and yield of the catalyst are calculated from the results of gas chromatographic analysis. The measurement temperature range was 200 C to 300 C. Activity, selectivity and yield are not influenced by space velocity or hydrogen sulphide concentration. At an oxygen to hydrogen sulphide ratio of 2, the selectivity is higher and activity is lower, but the long term stability of the catalyst is bad under these conditions. At higher ratios, the selectivity, conversion and yield are unaffected by higher hydrogen sulphide concentration.
In past research (contract EN3E-135-D) a concept was developed where catalysts and catalyst carriers are deposited on sinter-metals. This results in up to 40 times higher heat transfer coefficients than when classical refractory carrier materials are used. This can lead to a simple and low-cost design of chemical reactors with efficient heat transfer. The concept could be of great importance for a variety of processes (e.g. catalytic combustion, oxidation of H2S).
In the follow-up project a sinter-metal reactor will be developed for hydrogen sulphide oxidation to sulphur which is of interest from both an industrial and a pollution control point of view. The programme of work is as follows:
Determination of reaction kinetics: reaction rate as a function of temperature, pressure and reactants concentration (University of Utrecht).
Selection of alloys for the production of sintered metals; examination of porosity, pressure drop and heat conductivity as a function of particle size and pressure during sintering (KREBSOEGE, IKE) and the development of models describing these relations (VEG). The University of Utrecht will develop a simulation model for the reactor which is based on the Phoenics code made available by COMPRIMO.
The reactor will be built by KREBSOEGE; catalyst deposition in this reactor is the task of the University of Utrecht. Temperature distributions and conversions of H2S into S will be measured for different temperatures and concentrations (VEG).
Finally, the design of an industrial scale reactor based on sintermetal was proposed. More work is, however, required before the transfer of the technology to industry could be achieved.
Funding SchemeCSC - Cost-sharing contracts