Low temperature SCR de-NOx performance and mechanism of heteropolyacid VPO-Cr-PEG/TiO2 catalyst.

In this paper, a heteropolyacid catalyst VPO-Cr-PEG/TiO 2 was developed and the low temperature de-NO x performance of catalyst was studied. The experimental results showed that the de-NO x efficiency reached over 98% at the low temperature of 150–350 °C. The catalyst exhibited excellent sulfur and water resistance in the presence of 1000 ppm SO 2 and 8 vol% H 2 O. In the presence of polyethylene glycol (PEG), the crystal surface energy of the catalyst decreased, and (VO) 2 P 2 O 7 was the main active crystal phase of the catalyst. The selective catalytic reduction of NO x by NH 3 over VP(1/5)O-Cr-PEG/TiO 2 catalyst simultaneously followed the Langmuir-Hinshelwood and Eley-Rideal mechanisms. [Display omitted] • The heteropolyacid catalyst VPO-Cr-PEG/TiO 2 for NH 3 -SCR was developed. • The addition of PEG increased the crystallinity of VPO. • VP(1/5)O-Cr-PEG/TiO 2 showed good resistance to SO 2 & H 2 O. [ABSTRACT FROM AUTHOR]