The poisoning effect of PbO and PbCl on CeO-TiO catalyst for selective catalytic reduction of NO with NH.

The poisoning effect of PbO and PbCl on CeO-TiO catalyst for selective catalytic reduction of NO with NH was investigated and compared. Both Pb species could deactivate the CeO-TiO catalyst and PbO had a stronger poisoning effect than PbCl. From the characterization results of BET, XRD, XPS, NH-TPD and H-TPR, it was concluded that the more serious deactivation by PbO could be ascribed to smaller BET surface area, fewer surface Ce and chemisorbed oxygen, stronger interaction between PbO and CeO-TiO catalyst, lower redox properties and surface acidity.

Deactivation by HCl of CeO-MoO/TiO catalyst for selective catalytic reduction of NO with NH.

The effect of HCl on a CeO-MoO/TiO catalyst for the selective catalytic reduction of NO with NH was investigated with BET, XRD, NH-TPD, H-TPR, XPS and catalytic activity measurements. The results showed that HCl had an inhibiting effect on the activity of the CeO-MoO/TiO catalyst. The deactivation by HCl of the CeO-MoO/TiO catalyst could be attributed to pore blockage, weakened interaction among ceria, molybdenum and titania, reduction in surface acidity and degradation of redox ability.