Abstract
<p>Fe-based catalysts of different geometry are developed for the purification of coke oven gases: bulk, supported on alumina and supported on alumina silicate monoliths. Adsorption and decomposition of H<sub>2</sub>S on the catalysts developed are studied. Influence of active component content, type of support material and modification by Mn and Mo on the catalyst activity in de-H<sub>2</sub>S process is elucidated. Supported monolith catalysts show superior activity over bulk and supported spherical catalysts in H<sub>2</sub>S decomposition reaction and demonstrate stable operation in ammonia decomposition process during 2 hours at 900 °C giving 100% ammonia conversion.</p>
Highlights
Main impurities of coke oven gases (COG) are H2S and NH3
These experiments were fulfilled at the temperature of 600°C in order to decrease the contribution of the H2S decomposition reaction in the experiments
It is obvious that chemical transformation of a catalyst proceeds during H2S adsorption by formation of a new phase which is active in H2S decomposition reaction
Summary
Main impurities of coke oven gases (COG) are H2S and NH3. More than 99% of these impurities, which form harmful products upon oxidation or processing of COG, have to be removed taking into account environmental and technological aspects. It is necessary to note that besides Mo- and V-based catalysts, which are commonly studied in de-H2S reaction, Fe2O3 catalyst deserves attention as it exhibits high level of activity in H2S decomposition process, but in ammonia decomposition reaction as well [11,13,14], making this catalyst very promising for the use in the complex cleaning of COG. Bulk Fe2O3 catalysts were synthesized via thermal decomposition of different Fe-containing salts at 600°C, tableted and sieved to 1-2 mm (samples from F-1 to F-7, Table 1). Activity test in de-NH3 reaction was performed as follows: catalyst was placed into quartz reactor, at first was treated in He at 150°C during 30 min, at 600°C during 1 hour and catalyst activity was measured within temperature interval of 600-900°C. Physical chemical properties of bulk Fe2O3 catalysts synthesized via thermal decomposition of different Fe-containing salts at 600°C
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