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MnOx/TiO2 catalysts doped with sodium were prepared using the impregnation method. According to the results of the selective catalytic reduction (SCR) of NO with NH3, sodium had the strong poisoning effect on MnOx/TiO2 catalysts for NO decomposition. With the help of XRD, H2-TPR, NH3-TPD, TGA and FESEM, the structures and properties of the catalysts were characterised. Results indicated that the addition of sodium would weaken the role of active ingredients in the SCR process. Meanwhile, the reduction peaks of MnOx/TiO2 catalysts doped with sodium slightly shifted to higher temperatures with increasing content of sodium, attributing to the sintering of MnOx and sodium oxides. Based on the FESEM images, some larger particles were observed on the surface after sodium doping, which might be attributed to compounds of sodium manganese oxides. It could be concluded that the addition of sodium decreased the SCR activity of catalyst by slashing electron donation from the MnOx active site. [ABSTRACT FROM AUTHOR]

This work was our previous research on peritectic steel mould flux, which found that when the colour of peritectic steel mould flux is deepened, the heat-shield property enhanced. Here, adding glass colour agent into peritectic steel mould flux was introduced for the first time. Compared with our former work, Co2O3, NiO, Fe2O3, the black glass colour agent performed better on decreasing radiation heat transfer property than the single addition and the optimal contents of each component are 2 wt-% Co2O3, 2 wt-% NiO, 3 wt-% Fe2O3. In this paper, automatic colorimeter utilised to characterise the colour of samples and the heat flux densities result can clearly reflect the heat transfer property. The structures, composition and crystal properties of the samples were characterised by scanning electron microscope, energy-dispersive X-ray spectroscope, electron probe microanalyser and X-ray diffraction. The enhancement of heat-shield property is mainly attributed to the addition of black glass colour agent. [ABSTRACT FROM AUTHOR]

Bentonite is a material with low permeability and as such is the preferred material for impervious layer in a refuse landfill. Given the multi-scale structure of the bentonite, contaminant transport in it is a very complex process. In fact, it is coupled with consolidation. The coupling effect affects the contaminant transport by changing the inherent transport feature. In addition, the bentonite clay liner is usually unsaturated. In this article, the mixture theory is used as a framework that describes the transport phenomena and the interactions of the unsaturated bentonite under the multi-field coupling effect. It is also a valuable reference for simulating the contaminant transport in bentonite clay liners. [ABSTRACT FROM AUTHOR]