Аннотация:Palladium particles with a size of 2 nm were obtained by laser electrodispersion (LED) and used to fabricate the Pd-ZnHZSM-5(LED) catalyst (Pd = 0.0005 wt%). Conversion of dimethyl ether (DME) in synthesis gas (or hydrogen) atmosphere was studied at 340 оС in the presence of the LED catalyst and zeolite supports. The deposition of the LED palladium particles on the surface of the optimal support (ZnHZSM-5) provided a DME conversion of > 99.5 %; the percentage of the unreacted intermediate (methanol) decreased by an order of magnitude and the selectivity to i-alkanes increased (more than 80 wt%). The Pd-ZnНZSM-5(LED) catalyst showed higher activity and selectivity than the traditional Pd-ZnНZSM-5 catalyst (impregnation, Pd = 0.5 wt%). The features of the catalytic action of Pd-ZnHZSM-5(LED) are associated with the high density of nanosized Pd0 and Pd2+ phases on the ZnHZSM-5 surface, actively participating in the target redox process and acid-base processes. The results demonstrate the high promise of the LED method for the preparation of high-performance catalysts with ultralow content of noble metal for conversion of oxygenates to synthetic liquid hydrocarbons with a high yield of i-alkanes and low yield of arenes
