SULFUR RESISTANT NOBLE METAL NANO-PARTICLES ENCAPSULATED IN A ZEOLITE CAGE AS A CATALYST ENHANCER

摘要

A sulfur resistant catalyst is taught having noble metal nano-particlescontained in azeolite cage having a final pore size of between about 2.9 .ANG. and about 3.5.ANG.. The zeolitecage is either directly synthesized, or the final pore size of the zeolitecage is reduced bypost-treatments selected from chemical vapour deposition, chemical liquiddeposition,cation exchange and combinations thereof to allow passage of hydrogenmolecules intothe cage while excluding organic sulfur molecules. Disassociated hydrogenspecies fromreaction with the noble metal spill over through the zeolite pores to inducehydrogenationand to regenerate neighboring catalyst supports. A method is also taught forproducing asulfur resistant catalyst having noble metal nano-particles. The methodinvolves eithersynthesizing a zeolite cage having a final pore size of between about 2.9.ANG. and about 3.5.ANG. or reducing the size of pores in the zeolite cage by a post treatmentselected fromchemical vapour deposition, chemical liquid deposition, cation exchange andcombinations thereof.