III International Conference

PP-III-35The Cu, Ni/ γ -Al 2 O 3 catalyst obtained under the action of 22 kHz ultrasound possessesactivity in complex exhaust neutralization but the conversion degree by CO and NO x reaches100% at 300 °С only. We have a sample of the Cu, Ni/ γ -Al 2 O 3 catalyst (prepared under35 kHz ultrasound) with a 100 % activity at 200 °СOur new methods of catalyst preparation enable the properties to be improvedsubstantially in comparison with the impregnation technique. The catalytic characteristicsmay vary widely depending on the technique and conditions of preparation due to changes inthe nature of interaction between the catalyst's components, dispersity, porosity, crystalchemistry changes, and other factors affecting the course of catalytic reactions.Optimal synthesis conditions of polymetallic catalytic systems under ultrasonic treatmentwith a frequency 35 kHz and a duration 2 min at 25 °С have been established.The experimental data obtained demonstrate that ultrasonic treatment can be used todesign a novel environment-safe technology for the synthesis of various catalysts with theirproperties comparing favorably with those of similar commercial ones made by means of thetraditional impregnation techniques.535