Methanol
aqueous phase reforming (MAPR) reaction under mild conditions
is one of the most practical ways to generate hydrogen (H2), in which the liquid vaporization unit could be removed by the
water phase reforming, making the structure of an in situ H2 production reactor more compact. In this work, the H2 production performances of the metal-free catalyst, N-doped carbon
dots/g-C3N4 (NCDs/g-C3N4; CN-x) composites, was investigated for the MAPR
reaction under low temperature and normal pressure. The optimized
metal-free catalyst (NCDs/g-C3N4; CN-0.7) displays
a H2 yield of 19.5 μmol g–1 h–1 at 80 °C. More importantly, a clear understanding
on the effective MAPR reaction at low temperature and normal pressure
was acquired from in situ diffuse reflectance FTIR spectroscopy and
the transient photovoltage test. The introduction of NCDs leads to
the localization of surface charge, which is beneficial to the selective
adsorption and polarization activation of polar molecules on the catalyst
surface. This work provides a new strategy for the carbon-based catalyst
design of the MAPR reaction at low temperatures.
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