Abstract
A (5 wt.%)Mn-(1 wt.%)<TEX>$V_{2}O_{5}/TiO_{2}$</TEX> catalyst were prepared by co-precipitation method and used for low-temperature selective catalytic reduction (SCR) of <TEX>$NO_x$</TEX> with ammonia in the presence of oxygen. The properties of the catalysts were studied by X-ray diffraction (XRD), temperature programmed reduction (TPR) and scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDS). The experimental results showed that (5 wt.%)Mn-(1 wt.%)<TEX>$V_{2}O_{5}/TiO_{2}$</TEX> catalyst yielded 81% NO conversion at temperature as low as <TEX>$150^{\circ}C$</TEX> and a space velocity of <TEX>$2,400\;h^{-1}$</TEX>. Crystalline phase of <TEX>$Mn_{2}O_3$</TEX> was present at <TEX>${\ge}\;15%$</TEX> Mn on <TEX>$V_{2}O_{5}/TiO_{2}$</TEX>. XRD confirmed the presence of manganese oxide (<TEX>$Mn_{2}O_{3}$</TEX>) at <TEX>$2{\theta}=32.978^{\circ}(222)$</TEX>. The XRD patterns presented of (5 wt.%)Mn-(1 wt.%)<TEX>$V_{2}O_{5}/TiO_{2}$</TEX> did not show intense or sharp peaks for manganese oxides and vanadia oxides. The TPR profiles of (5 wt.%)Mn-(1 wt.%)<TEX>$V_{2}O_{5}/TiO_{2}$</TEX> catalyst showed main reduction peat of a maximum at <TEX>$595^{\circ}C$</TEX>.
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