Dynamics of the Activity and Physicochemical Characteristics of Pt/WO4 2−–ZrO2 Catalysts in the Hydroisomerization of Heptane and Heptane–Benzene Mixtures

Promoting Role of Oxygen Deficiency on a WO3-Supported Pt Catalyst for Glycerol Hydrogenolysis to 1,3-Propanediol

“…Although the two as-prepared samples (L-WO 3 and H-WO 3 ) from different synthetic conditions have the same framework structures, the obvious difference in the surface chemical environment for the two samples could be observed by XPS, EPR, and UV–vis characterization. The presence of V O on the surface of the two samples was evidenced by EPR (Figure S2), and the signal intensity of H-WO 3 is higher than that observed for L-WO 3 , indicating that H-WO 3 has more V O concentration on the surface. , W 4f XPS spectra (Figure a,b) for the two samples show that there are two kinds of W atoms − (W 5+ and W 6+ ) on the surface of the samples, but more W atoms around W 5+ accounting for 10.3% of the total peak area for W 5+ and W 6+ were observed for the H-WO 3 sample, and only 2.8% for the L-WO 3 sample, illustrating the increasing concentration of V O on the surface of the H-WO 3 sample . The H-WO 3 sample was synthesized in the presence of sodium oleate, and the unsaturated CC double bonds in oleate ion have reductivity property to some extent which enables some of the surface W to be reduced to a lower balance state, leading to the higher V O concentration on the surface compared to L-WO 3 obtained in the absence of sodium oleate.…”

In Situ Growth of Tungsten Oxide on Alumina to Boost the Catalytic Performance of Platinum for Glycerol Hydrogenolysis

“…The XPS spectra and fitting results are displayed in Figure and Table , respectively. The W 4f 7/2 binding energies around 35.09 and 35.92 eV in Pt/H–WO 3 /γ-Al 2 O 3 corresponded to W 5+ and W 6+ , − respectively. There are some differences for Pt/C–WO 3 /γ-Al 2 O 3 with 35.18 eV for W 5+ and 36.00 eV for W 6+ .…”

Application of ionic mesoporous silica in selective recovery of tungstate ions through column adsorption and subsequent photocatalytic degradation of an organic dye

“…7a reveals elements C, N, O, Si, and W in the spectra of W-IMOS/RhB, whereas the neat IMOS depicts all such elements except W. The XPS results demonstrate the efficient adsorption of W(VI) species and their reliability during photocatalytic degradation. 51,52 The deconvolution of XPS spectra further assisted in understanding the role of IMOS nanoparticles throughout the adsorption as well as photocatalysis. The high-resolution XPS spectra (Fig.…”