- Hollow Carbon Sphere Nanoreactors Loaded with PdCu Nanoparticles: Void-Confinement Effects in Liquid-Phase Hydrogenations
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Nanoreactors with hollow structures have attracted great interest in catalysis research due to their void-confinement effects. However, the challenge in unambiguously unraveling these confinement effects is to decouple them from other factors affecting catalysis. Here, we synthesize a pair of hollow carbon sphere (HCS) nanoreactors with presynthesized PdCu nanoparticles encapsulated inside of HCS (PdCu?HCS) and supported outside of HCS (PdCu/HCS), respectively, while keeping other structural features the same. Based on the two comparative nanoreactors, void-confinement effects in liquid-phase hydrogenation are investigated in a two-chamber reactor. It is found that hydrogenations over PdCu?HCS are shape-selective catalysis, can be accelerated (accumulation of reactants), decelerated (mass transfer limitation), and even inhibited (molecular-sieving effect); conversion of the intermediate in the void space can be further promoted. Using this principle, a specific imine is selectively produced. This work provides a proof of concept for fundamental catalytic action of the hollow nanoreactors.
- Dong, Chao,Liu, Jian,Su, Panpan,Wang, Guang-Hui,Ye, Run-Ping,Yu, Qun
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supporting information
p. 18374 - 18379
(2020/08/19)
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- Flow-vacuum pyrolysis of polycyclic compounds. 24.1 pyrolysis of two dibenzocycloalkanols and their corresponding acetates
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The flow-vacuum pyrolyses of 6-hydroxymethyl-6H-5,7-dihydrodiben/o[a,c] cycloheptene (4), 6-methyl-6H-5,7-dihydro-dibenzo[a,c]cyclohepten-6-ol (5) and their corresponding acetates (6) and (7) were studied. The products' distributions were determined by GC/MS and the reaction mechanisms involving radical species were suggested, in order to explain the formation of the main reaction products.
- Istrati, Daniela,Parvulescu, Luminitza,Popescu, Angela,Mihaiescu, Dan,Draghici, Constantin,Marion, George,Simion, Alina
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p. 589 - 599
(2007/10/03)
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