Effect of doped metals on catalytic performance for methanol decomposition
To enhance the methanol catalytic decomposition in alcohol-hydrogen engines,the effect of Cu3Ni1N/Al2O3 catalysts(N=Zn,Co,Ce,La and Zr)on the catalytic behavior of the methanol decomposition reaction was investigated to examine their temporal stability,in comparison with undoped Cu3Ni1/Al2O3 catalysts.All the catalysts were characterized by XRD(X-ray Diffraction),H2-TPR(temperature programmed reduction),BET(Brunauer-Emmett-Teller),SEM(scanning electron microscope)and XPS(X-ray photoelectron spectroscopy).The results show that the doping of the third metal element can enhance the methanol decomposition rate and reduce the generation of by-products.In terms of the doping elements,La is difficult to load and thus has only little effect on methanol decomposition.Zr can be well dispersed in the catalyst to promote the decomposition reaction.Co can synergize with Ni to promote the formation of Co-Ni alloy to promote the methanol decomposition,but its by-products are too high to be suitable for the actual production.Zn can be uniformly adhered to the surface of the carrier to form a large number of fine particles.Ce can activate Cu2+and promote the dispersion of Cu,which is not suitable for the production of methanol,which has the best effect on the enhancement of methanol decomposition rate.Cu3Ni1Ce1/Al2O3 catalyst has the best effect on methanol decomposition.
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