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Green Chemistry
Page 5 of 7
DOI: 10.1039/C5GC02530C
Journal Name
COMMUNICATION
In summary, diverse MOFs have been converted to porous
carbons with different degrees of hydrophilicity at different
pyrolysis temperatures, which were employed to stabilize Pd
NPs for catalysis in bio-oil refining. It is found that the
wettability of MOF-derived porous carbons play a crucial role
in the catalytic activity of biofuel upgrade. The Pd NPs
stabilized by NPC-ZIF-8 with great hydrophilicity exhibit
excellent catalytic performance for the HDO of vanillin, a
common component in lignin-derived bio-oil, under mild
conditions in a green solvent, water.The remarkable catalytic
activity, selectivity and recyclability of Pd/NPC-ZIF-8 can be
mainly attributed to: 1) high surface area and hierarchical
pores involved in the catalyst not only enables the stabilization
of Pd NPs in very small sizes (~1 nm) but also facilitates the
transport of reactants and products; 2) the high content of
graphitic-N doping merits the great hydrophilicity, which
ensures the sufficient contact between substrates and catalyst;
3) the graphitic-N in the carbon favors the electron transfer to
Pd sites and the resultant electron-rich Pd greatly improves
the catalytic activity; 4) the high stability of NPC-ZIF-8
evidently is also helpful to the recyclability. Given the
structural diversity and tailorability of MOFs, there is huge
opportunity to achieve MOF-derived porous carbons with
great tunability such as structure, component, porosity, pore
size, surface area, etc., which would open a new avenue to
carbon supported metal NPs in catalysis.
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This work is supported by the NSFC (21371162, 51301159
and 21521001), the 973 program (2014CB931803), NSF of
Anhui Province (1408085MB23), Research Fund for the
Doctoral Program of Higher Education of China
(20133402120020), the Recruitment Program of Global Youth
Experts and the Fundamental Research Funds for the Central
Universities (WK2060190026).
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