Nb2O5在t-ZrO2表面的分散状态与Brønsted 酸特征

引用本文: 何杰, 范以宁. Nb₂O₅在t-ZrO₂表面的分散状态与Brønsted 酸特征[J]. 物理化学学报, 2011, 27(10): 2416-2420. doi: 10.3866/PKU.WHXB20110934 shu

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

Nb₂O₅在t-ZrO₂表面的分散状态与Brønsted 酸特征

何杰 ^1,2, ,
范以宁 ^2,

基金项目:
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)

摘要: 以草酸铌为前驱物, 四方相氧化锆(t-ZrO₂)为载体, 通过浸渍法制备不同负载量的Nb₂O₅/t-ZrO₂催化剂.采用粉末X 射线衍射(XRD)、激光拉曼光谱(LRS)、紫外-可见漫反射光谱(UV-Vis DRS)等技术对t-ZrO₂表面Nb₂O₅分散状态进行表征; 采用异丁烯(IB)与异丁醛(IBA)缩合生成2,5-二甲基-2,4-己二烯(DMHD)反应评价不同负载量的Nb₂O₅/t-ZrO₂的催化性能，采用吡啶吸附红外(Py-IR)光谱表征催化剂Brønsted 酸中心特征. 结果表明, 由XRD定量相分析方法测定的Nb₂O₅在t-ZrO₂表面单层分散容量与"嵌入模型"预测值接近. Nb₂O₅/t-ZrO₂表面Brønsted 酸中心特征与Nb₂O₅聚集状态密切相关.

关键词:

English

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: 27 September 2011
Fund Project:
国家重点基础研究发展计划项目(G1999022400)

国家自然科学基金(21071004)资助

Abstract: 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.

Key words:

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Nb₂O₅在t-ZrO₂表面的分散状态与Brønsted 酸特征

English

Dispersion States and Brønsted Acidity Feature of Nb₂O₅on t-ZrO₂

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