An Efficient Pd-Sn Catalyst Supported on MWNTs for Hydrogenation of High Concentrated Acetylene Feedstocks: the Potential Role of Isolated Adsorption Site

In the present study, tin-promoted pd/mwnts nanocatalystwas synthesized via polyol technique for application in hydrogenation of high-concentrated acetylene feedstocks. tem images showed a restricted distribution of nanoparticles in the range of 3-5 nm. the results indicated that nanoparticles sizes were resistant to further catalyst deactivation. xrd patterns signified alloying between pd and sn which contained a high percentage of ordered intermetallic structures (70.8%), as confirmed by xps. according to the results, pore blocking and/or fouling was known as the main reasons of the catalyst deactivation. here, we supposed a novel deactivation mechanism based on which dehydrogenation susceptibility of carbonaceous species (green oil) played a significant role in the formation of the isolated adsorption sites and then, catalyst deactivation.