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Preparation of Ni/MgO catalysts for carbon nanofibres by a self-propagating low temperature combustion process

100%

Zhang Y. , Tang Y. H. , Zhang E. L. , Lin L. W. , Pei L. Z.

tom Vol. 28, No. 4

764--772

Ni/MgO catalysts were prepared using nitrate salt and citric acid in various ratios by the sol-gel selfpropagating, low temperature combustion process. The products were characterized by the scanning electron microscopy, X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry. The results show that Ni/MgO catalyst precursors of various particle sizes can be obtained by controlling the amount of citric acid. The catalytic activity of Ni/MgO decreases as the calcination temperature increases, owing to the difficulty of the NiO reduction. The mechanism of formation of Ni/MgO catalysts has also been proposed. Self-propagation combustion has great advantage of occurring at low temperatures, and the Ni/MgO is a suitable catalyst for low cost preparation of carbon nanofibres.

Preparation and photocatalytic activity of multi-walled carbon nanotubes/Mg-doped ZnO nanohybrids

72%

Chen C. S. , Xie X. D. , Cao S. Y. , Liu T. G. , Lin L. W. , Chen X. H. , Liu Q. C. , Kuang J. C. , Xiao Y.

Materials Science Poland

2015

tom Vol. 33, No. 3

460--469

Multi-walled carbon nanotubes/Mg-doped ZnO (MWNTs/Zn1-xMgxO) nanohybrids were prepared by co-precipitation method, and their photocatalytic activity for methyl orange (MO) was studied. Experimental results showed that Mg-doped ZnO nanoparticles were successfully deposited on the surface of MWNTs under annealing at 450 degrees C and 550 degrees C. The resultant MWNTs/Zn0.9Mg0.1O nanohybrids had better photocatalytic activity for degradation of methyl orange than pure ZnO: the rates of MO photodegradation were 100 % and 30 % for 1 h, respectively. The enhancement in the photocatalytic activity was attributed to the excellent electronic properties of MWNTs and Mg-doping.