Fabrication of metal nanoparticles in metal organic framework NH2-MIL-125 by UV photo-assisted methods for optimized catalytic properties

• Pd NPs were synthesized in the Ti based MOF using photo-assisted deposition.
• The influence on the size, location and state of Pd NPs were investigated.
• Catalytic activity was examined in the H2 production from ammonia borane.
• Best sample is obtained by combining UV irradiation with reduction by H2 gas.

The influence of preparation method on the size, location and state of Pd nanoparticles were investigated within the pores of amine-functionalized metal organic frameworks NH2-MIL-125 using three different photo-assisted deposition methods and the conventional impregnation method. The oxidation state, size and location were determined by XAFS and TEM. The catalytic activity was studied for hydrolysis of ammonia borane (AB) at ambient temperature. The choice of solvent and hole scavenger/reducing medium directly influence the location and the reduction of the particles. Our study shows that the best sample is prepared by combining UV irradiation with a direct reduction by H2 gas, and finding the right amount solvent and solvent/hole scavenger ratio is necessary for successful NPs synthesis using only UV light irradiation.

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