The article presents the results of oxidative leaching of lead sludge from copper production in order to extract rhenium into solution. The optimum regimes for product leaching man-made product in the presence of sodium peroxocarbonate Na₂CO₃1.5H₂O₂ has been established: Experimental work was carried out under the following conditions: oxidant consumption 5 by weight of the raw material, leaching temperature 70C, duration 3060minutes, stirring speed 200rpm, and the ratio of liquid to solid S:L=1:3. The degree of extraction of rhenium into the solution is 9597, and the content reaches 500520mg/L Re.

This work is devoted to the study of the activity of monometallic (Fe/Al₂O₃) and bimetallic (Fe-Mo/Al₂O₃) catalysts supported to carrier γ- Al₂O_3. It has been discovered that the bimetallic catalyst is more active than the monometallic catalyst in the methane decomposition reaction. The results of the influence of molybdenum oxide on the activity of Fe/Al₂O₃ catalyst in the methane decomposition reaction in the temperature range 500-850°C have been obtained. It has been determined that the addition of molybdenum oxide in the amount of 5 wt. % of the iron catalyst composition leads to an increase in the catalytic activity of the sample in the reaction of methanedecomposition to hydrogen at relatively low temperatures. Compared to Fe/Al₂O₃ on the FeMo/Al₂O₃ catalyst at a reaction temperature of 750°C, methane conversionincreases from 8% to 98%, hydrogen yield from 5% to 57%. The increased field of activity Fe-Mo/Al₂O₃catalyst in the decomposition of methane to hydrogen compared to Fe/Al₂O₃ catalysts is due to an increase in the dispersity of the active phases of the catalyst, as well as the formation of an easily reduced Fe₂(MоО₄)₃ phase, according to XRD, TPR-H₂, and BET methods.