Jeong, Young Eun Kumar, Pullur Anil Ha, Heon Phil Lee, Kwan-young 2024-01-19T21:32:10Z 2024-01-19T21:32:10Z 2021-09-05 2018-11 0922-6168 https://pubs.kist.re.kr/handle/201004/120750 Herein, we investigated the NOx reduction performance of Sb-V-CeO2/TiO2 (SbVCT) catalyst subjected to hydrothermal aging, where 6 vol% of H2O was fed to the SbVCT for 16h with variable temperatures of 550-750 degrees C. The structural, morphological, redox, and acid properties of fresh and aged catalysts were comprehensively characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman, N-2-physisorption, temperature programmed reduction/desorption (H-2-TPR/NH3/NO-TPD) and in situ DRIFTS. The XRD, Raman and TEM results of the fresh and the one hydrothermally aged at 550, 600 degrees C catalysts indicated the presence of finely dispersed polymeric vanadia, antimony, and nano-crystalline ceria species on TiO2 support. The SbVCT catalysts hydrothermally aged at the temperatures600 degrees C showed better NOx conversions than the others aged>600 degrees C. This was because aging at the temperatures600 degrees C could help to minimize the loss of surface redox/acid properties that were originally inherent to surface vanadyl and CeO2 species that went into CeVO4 and large CeO2 aggregates. This in turn led to the loss of surface redox and acidic characters indigenous to the SbVCT and reduced its NOx reduction performance. Moreover, the NOx reduction performance of hydrothermally aged V-WO3-TiO2 catalyst, when compared with that of SbVCT catalyst, showed relatively low NOx conversions at the temperatures below 300 degrees C. English SPRINGER IN-SITU DRIFTS MIXED-OXIDE CATALYST NITRIC-OXIDE ACTIVITY ENHANCEMENT SURFACE-PROPERTIES REACTION-MECHANISM TITANIA CATALYSTS VANADIA-TITANIA ACTIVE-SITES FAST NH3-SCR Effect of hydrothermal aging on NOx reduction performance for Sb-V-CeO2/TiO2 catalyst Article 10.1007/s11164-018-3523-9 1 RESEARCH ON CHEMICAL INTERMEDIATES, v.44, no.11, pp.6803 - 6829 RESEARCH ON CHEMICAL INTERMEDIATES 44 11 6803 6829 scie scopus 000449307900023 2-s2.0-85049579317 Chemistry, Multidisciplinary Chemistry Article IN-SITU DRIFTS MIXED-OXIDE CATALYST NITRIC-OXIDE ACTIVITY ENHANCEMENT SURFACE-PROPERTIES REACTION-MECHANISM TITANIA CATALYSTS VANADIA-TITANIA ACTIVE-SITES FAST NH3-SCR Hydrothermal aging CeVO4 Polymeric VOx species Raman spectra NOx conversion