Lee, Kyung Ju Kumar, Pullur Anil Maqbool, Muhammad Salman Rao, Komateedi Narayana Song, Kwang Ho Ha, Heon Phil 2024-01-20T11:31:40Z 2024-01-20T11:31:40Z 2021-09-05 2013-10 0926-3373 https://pubs.kist.re.kr/handle/201004/127616 A systematic investigation of the effect of ceria loading over Sb-V2O5/TiO2 catalysts was carried out for the selective catalytic reduction (SCR) of NOx by NH3. The various ceria loaded Sb-V2O5/TiO2 catalysts were prepared by deposition precipitation and impregnation methods. Addition of 10% ceria to Sb-V2O5/TiO2 catalyst significantly enhanced the NOx conversion at wide temperature range of 220-500 degrees C. The 10% ceria loaded Sb-V2O5/TiO2 catalyst showed superior N-2 selectivity (>95%) throughout the reaction temperatures. The physicochemical characteristics of the obtained catalysts were thoroughly characterized by BET surface area, X-ray diffractometry (XRD), temperature programmed desorption (TPD) of NO, SO2 and NH3, H-2- temperature programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The XRD results indicated the active components of antimony and vanadia were homogeneously dispersed over CeO2/TiO2. It was found that the addition of 10% ceria to Sb-V2O5/TiO2 could enhance the total acidity and redox properties of the catalyst, which lead to show higher NOx conversions at wide temperature window. In XPS studies, increase in intensity of the chemisorbed mobile oxygen peak was observed for ceria loaded catalysts. In particular, the DRIFT spectra of ceria loaded Sb-V2O5/TiO2 catalysts showed abundant Bronsted acid sites at 1436 and 1673 cm(-1) band, which are responsible for high NOx conversion. Furthermore, the results of NO and SO2 TPD of 10% ceria loaded Sb-V2O5/TiO2 catalyst showed enhancement of NO adsorption and SO2 inhibition properties, which is thought to play a significant role in long term stability of the catalyst during SO2 on-off study for 38 h at 240 degrees C. (c) 2013 Elsevier B.V. All rights reserved. English ELSEVIER MANGANESE OXIDE CATALYSTS NITRIC-OXIDE SURFACE CHARACTERIZATION AUTOMOTIVE EXHAUST NO REDUCTION FT-IR OXIDATION AMMONIA OXYGEN ADSORPTION Ceria added Sb-V2O5/TiO2 catalysts for low temperature NH3 SCR: Physico-chemical properties and catalytic activity Article 10.1016/j.apcatb.2013.05.071 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.142, pp.705 - 717 APPLIED CATALYSIS B-ENVIRONMENTAL 142 705 717 scie scopus 000324077600080 2-s2.0-84880030799 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article MANGANESE OXIDE CATALYSTS NITRIC-OXIDE SURFACE CHARACTERIZATION AUTOMOTIVE EXHAUST NO REDUCTION FT-IR OXIDATION AMMONIA OXYGEN ADSORPTION Sb-V2O5-Ce/TiO2 Ceria effect XPS TPD Bronsted acid sites