Winner of the 2011 Bainton Prize for Reference Works The "canon" of Hispanic mysticism is expanding. By taking a more inclusive approach to studying mysticism in its "marginal" manifestations, we ...draw mysticism--in all its complex iterations--back toward its rightful place at the center of early modern spiritual experience.
Palladium nanoclusters were synthesized within microphase-separated diblock copolymer films of MTD
113Pd(Cp
N)PA
50 (MTD=methyltetracyclododecene, Cp
N=
endo-2-(cyclopentadienylmethyl)norborn-5-ene, ...PA=η
3-1-phenylallyl). The organometallic repeat units were reduced by exposing the films to hydrogen at 100°C, leading to the formation of nearly monodisperse palladium nanoclusters. TEM was used to measure the cluster size. The nanocomposite films were active and selective catalysts for the gas phase hydrogenation of 1,3-butadiene. Selectivity for butenes was improved by lowering the hydrogen partial pressure, and lower temperature favored formation of 1-butene over 2-butenes.
Palladium nanoclusters were synthesized within microphase-separated diblock copolymer films of MTD
113Pd(Cp
N)PA
50 (MTD=methyltetracyclododecene, Cp
N=
endo-2-(cyclopentadienylmethyl)norborn-5-ene, ...PA=
η
3-1-phenylallyl). The organometallic repeat units were reduced by exposing the films to hydrogen at 100°C, leading to the formation of nearly monodisperse palladium nanoclusters. TEM, SAXS, and WAXS were used to characterized the polymer morphology and cluster size. The nanocomposites were active catalysts for hydrogenation of ethylene and propylene. The cluster size and voids within the polymer matrix were important factors in determining the catalyst activity, expressed as the moles of alkene hydrogenated per mole palladium per second. In contrast to permeation results that showed that the permeability of propylene in polyMTD is greater than that of ethylene, the catalyst activity for hydrogenation of ethylene was greater than that for propylene.
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