01754nas a2200217   4500008004100000022001400041245011700055210006900172260007700241300001400318490000600332520094900338653002201287653001801309653001701327653001401344653001401358100002001372700001801392856012601410       2013                        eng d  a1867-388000aPd ultra-small clusters as precursors for silica-encapsulated Pd nanoreactors: highly sinter-resistant catalysts0 aPd ultrasmall clusters as precursors for silicaencapsulated Pd n  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJUL  a1911-19160 v53 a<p>Sintering and consequent deactivation in supported metal catalysts is a severe problem encountered in heterogeneous catalysis. This problem can be addressed by encapsulating active metal nanoparticles within inert oxides such as silica, provided the oxide shell is porous to enable access of reactant molecules to the nanoparticle surface to facilitate catalysis. We report the synthesis of highly sinter-resistant silica-encapsulated Pd catalysts with nanoparticle sizes stabilized at (3.4 +/- 0.6)nm at high temperatures of approximately 750 degrees C. The synthesis was achieved by utilizing thiol-protected ultra-small clusters of Pd as precursors for silica encapsulation. The ultra-small clusters were synthesized by using propyl ammonium functionalised thiols making them water-dispersible and amenable for silica encapsulation. Abundance of organics also aided in creating porosity subsequent to calcination at high temperatures.</p>10acluster compounds10aEncapsulation10ananoreactors10aPalladium10asilicates1 aSamanta, Anupam1 aDevi, Nandini  uhttps://library.ncl.res.in/content/pd-ultra-small-clusters-precursors-silica-encapsulated-pd-nanoreactors-highly-sinter-0