Abstract: The present invention relates to metallic catalysts containing nanoparticles of transition metals in particular of Co, Ru, Fe, Pd and Rh, disposed in pure ionic liquids or impregnated on supports that comprise zeolites, silicas, aluminas and oxides, forming catalytic systems, and to a method for preparation thereof.

Abstract: A quick connect coupling for removably joining two pipes includes an upstream element and a downstream element adapted to be fitted axially with the upstream element thereby opening a valve movable between a position of opening and a position of closure. The upstream element is provided with at least one O-ring disposed to surround the valve and is adapted for connection to an upstream pipe for inlet of pressurized gas, particularly oxygen. A primary sealing zone is provided upstream of the O-ring which is dimensioned to induce a significant reduction in a flowrate of gas flowing in the direction of the O-ring in order to limit overheating of the O-ring.

Abstract: This invention relates to a quick connection for removably joining two pipes, which comprises an upstream element and a downstream element adapted to be fitted in each other axially, provoking the opening of a valve mobile between a position of opening and a position of closure, said upstream element being provided with at least one O-ring made of elastomer or plastics material, disposed in the vicinity of said valve and comprising means for connection to an upstream pipe for inlet of pressurized gas, particularly oxygen. This connection comprises means for forming, both in the positions of opening and of closure, primary sealing zones which extend upstream of the or each O-ring, these zones presenting dimensions adapted to induce a significant reduction in the flowrate of gas flowing in the direction of the or each O-ring, in order to limit the overheating of the or each O-ring.