VO supported on TiO-CeZrO core-shell structure catalyst for NH-SCR of NO.

In this experiment, a TiO-CeZrO support with core-shell structure was successfully prepared by a precipitation method and VO /TiO-CeZrO catalyst was prepared by an impregnation method, and the catalyst was used to catalyze the NH-SCR of NO. Based on the results of HRTEM, XRD, BET, H-TPR, NH-TPD, XPS, Py-IR, it was speculated that due to the interaction between TiO and CeZrO, more oxygen vacancies and Ce are generated, which are beneficial to the existence of low-valence V by electron transfer between high valence state V and Ceand increase the acidic sites on the catalyst surface. The catalytic activity (>97%) of the VO /TiO-CeZrO catalyst is superior to the current commercial catalyst (VO-WO/TiO) and has a higher N selectivity (>97.5%) at 40 000 h GHSV and 250-400 °C.