Nd-Co 3O 4 catalysts were prepared by hydrothermal and co-precipitation methods to catalyze the decomposition of N 2O. The catalysts prepared by hydrothermal method showed higher activity. Among the hydrothermal Nd-Co...Nd-Co 3O 4 catalysts were prepared by hydrothermal and co-precipitation methods to catalyze the decomposition of N 2O. The catalysts prepared by hydrothermal method showed higher activity. Among the hydrothermal Nd-Co 3O 4 catalysts, the catalyst with Nd/Co molar ratio of 0.01 had higher activity. 0.01Nd-Co 3O 4 catalyst was then impregnated by K 2CO 3 solution to prepare K-modified catalyst. The catalysts were characterized by means of X-ray diffraction (XRD), nitrogen physisorption, scanning electrons microscopy (SEM), X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H 2-TPR), and oxygen temperature-programmed desorption (O 2-TPD). The results show that Nd-Co 3O 4 and K-modified catalysts exhibit spinel structure. In contrast to bare Nd-Co 3O 4, the K-modified catalyst with higher activity is due to its weaker strength of Co-O bond and easier desorption of surface oxygen species. In addition, over 90% conversion of N 2O can be reached over 0.02K/0.01Nd-Co 3O 4 at 350 ℃ for 40 h under the co-presence of oxygen and steam in feed gases.展开更多
Nd-doped MoN was prepared by thermal permeation of rare earth Nd in MoN using FeMo6 as the precursor. XRD, DTA, XPS and XRF have been used to characterize the FeMo6 precursor and the thermal treated samples. XRD, XPS ...Nd-doped MoN was prepared by thermal permeation of rare earth Nd in MoN using FeMo6 as the precursor. XRD, DTA, XPS and XRF have been used to characterize the FeMo6 precursor and the thermal treated samples. XRD, XPS and XRF results show that FeMo6 structure is decomposed and Nd-doped MoN is formed during the thremal treatment. XPS results also give the evidence that it is Nd3+ ion that can be permeated into the bulk of MoN. The conductivity of MoN is increased from 0.228 S·cm-1 to 2.649 × 102 S·cm-1 by Nd doping.展开更多
基金The project was supported by the Shandong Natural Science Foundation (ZR2017MB020)Graduate Innovation Foundation of Yantai University (YDYB1909).
文摘Nd-Co 3O 4 catalysts were prepared by hydrothermal and co-precipitation methods to catalyze the decomposition of N 2O. The catalysts prepared by hydrothermal method showed higher activity. Among the hydrothermal Nd-Co 3O 4 catalysts, the catalyst with Nd/Co molar ratio of 0.01 had higher activity. 0.01Nd-Co 3O 4 catalyst was then impregnated by K 2CO 3 solution to prepare K-modified catalyst. The catalysts were characterized by means of X-ray diffraction (XRD), nitrogen physisorption, scanning electrons microscopy (SEM), X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H 2-TPR), and oxygen temperature-programmed desorption (O 2-TPD). The results show that Nd-Co 3O 4 and K-modified catalysts exhibit spinel structure. In contrast to bare Nd-Co 3O 4, the K-modified catalyst with higher activity is due to its weaker strength of Co-O bond and easier desorption of surface oxygen species. In addition, over 90% conversion of N 2O can be reached over 0.02K/0.01Nd-Co 3O 4 at 350 ℃ for 40 h under the co-presence of oxygen and steam in feed gases.
文摘Nd-doped MoN was prepared by thermal permeation of rare earth Nd in MoN using FeMo6 as the precursor. XRD, DTA, XPS and XRF have been used to characterize the FeMo6 precursor and the thermal treated samples. XRD, XPS and XRF results show that FeMo6 structure is decomposed and Nd-doped MoN is formed during the thremal treatment. XPS results also give the evidence that it is Nd3+ ion that can be permeated into the bulk of MoN. The conductivity of MoN is increased from 0.228 S·cm-1 to 2.649 × 102 S·cm-1 by Nd doping.
