Method of preparation of oxide catalyst

A novel catalyst in the form of powder containing chromium nanoparticles on zirconia support obtained by the sonication process is presented in technology offer.

The major disadvantage of standard alumina supported metal catalysts (Pd, Pt, Rh) on alumina used for VOC combustion is their low thermal stability and susceptibility poisoning (deactivation). The present invention provides a process for the preparation of a noble metal-free catalyst. Moreover, the world's precious metal reserves are very limited and the costs of synthesis precious metals-based catalysts are high.

It should be noted that XRF and EDX tests for obtained catalyst have shown that about half of the chromium input is on the surface of the catalyst, which is undoubtedly beneficial as it reduces the diffusion limits. The catalyst obtained according to the invention is characterised by high activity and selectivity to desired products of total combustion. The catalyst exhibits high catalytic activity in methane combustion. The tests were performed in a comparative system with a palladium catalyst.

Preferred catalyst features are associated with the unconventional preparation of the active phase precursor in an aqueous medium with the participation of organic radicals. The use of sonication pulse program leads to the stabilisation of nanoparticles. It is well known that the formation of cavitation bubbles results in the formation of specific high pressure and temperature conditions. During interruptions in the impact of ultrasonic waves on the reaction environment, cavitation bubbles collapse, which is advantageous.