Manganese-based catalysts

Other metal oxide catalysts studied for the SCR-NH3 reaction include iron, copper, chromium and manganese oxides supported on various oxides, introduced into zeolite cavities or added to pillared-type clays. Copper catalysts and copper-nickel catalysts, in particular, show some advantages when NO—N02 mixtures are present in the feed and S02 is absent [31b], such as in the case of nitric acid plant tail emissions. The mechanism of NO reduction over copper- and manganese-based catalysts is different from that over vanadia—titania based catalysts. Scheme 1.1 reports the proposed mechanism of SCR-NH3 over Cu-alumina catalysts [31b],... 

Table 11.2 Catalytic data for DRM reaction using manganese-based catalysts. ...

Figure 18.9 Variation of conversion of naphthalene into CO2 with the reaction temperature for manganese-based catalysts calcined at 600 °C (a) and of the selectivity to CO2 with naphthalene conversion (b) (( ) nanocasting...

The performance of abase metal catalyst in pellet form was evaluated with acrylonitrile and results indicated that the manganese-based catalyst was more active than the chromium-based catalyst. Both manganese and manganese doped with copper showed complete conversion of acrylonitrile at around 260°C, while the chromium catalyst showed only about 50% conversion at 500 C, as shown in Fig. 7.17. When the performance of the precious metal catalysts was compared to that of the base metal catalysts it was found that ... 

Manganese-based catalysts showed the same performance as a Pt (LS) catalyst. 

In spite of their lower combustion activity with respect to noble metal-based catalysts, base metal-based catalysts, such as Mn0x/Al203, are commercially used for the catalytic combustion of oxygenated VOCs. Manganese-based catalysts, such as unsupported Mu304, as well as Mn oxides supported on carriers such as alu-... 

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