Citation: HE Jie, FAN Yi-Ning. Dispersion States and Brønsted Acidity Feature of Nb₂O₅on t-ZrO₂[J]. Acta Physico-Chimica Sinica, ;2011, 27(10): 2416-2420. doi: 10.3866/PKU.WHXB20110934 shu

Dispersion States and Brønsted Acidity Feature of Nb₂O₅on t-ZrO₂

HE Jie ^1,2, ,
FAN Yi-Ning ²

1.
1. School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui Province, P. R. China;
2. Key Laboratory of Mesoscopic Chemistry of MEO, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China

Received Date: 16 May 2011
Available Online: 29 July 2011
Fund Project: 国家重点基础研究发展计划项目(G1999022400) (G1999022400)国家自然科学基金(21071004)资助 (21071004)

Nb₂O₅/t-ZrO₂ catalysts with different loadings were prepared by aqueous solution impregnation using niobium oxalate as a precursor on tetra nal ZrO₂ (t-ZrO₂). The dispersion states with respect to niobia species on t-ZrO₂ were characterized by powder X-ray diffraction (XRD), laser Raman spectroscopy (LRS), and UV visible diffuse reflectance spectroscopy (UV-Vis DRS). The catalytic activity was evaluated by the condensation reaction of iso-butene (IB) and iso-butyraldehyde (IBA) to 2,5-dimethyl-2,4-hexadiene (DMHD) and the Brønsted acidity was evaluated by the Fourier-transform infrared spectroscopy of pyridine adsorption (Py-IR). The results reveal that the dispersion capacity Γ_Nb of Nb₂O₅ on t-ZrO₂, which was determined by XRD quantitative phase analysis, is almost identical to the value predicted by the "incorporated model". The results also show that the Brønsted acid sites are strongly related to the states of Nb₂O₅ on Nb₂O₅/t-ZrO₂.
- Nb₂O₅,
- t-ZrO₂,
- Surface dispersion state,
- Surface acidity feature,
- Olefin-aldehyde condensation
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Dispersion States and Brønsted Acidity Feature of Nb₂O₅on t-ZrO₂