The state of the dispersed niobia species on
γ-Al 2 O 3 and their
catalytic performance for the condensation of isobutylene and isobutyraldehyde

doi:10.1007/s11458-009-0111-y

Front. Chem. China

2010, Vol. 5

Issue (1) : 109-112 https://doi.org/10.1007/s11458-009-0111-y

Research articles

The state of the dispersed niobia species on γ-Al 2 O 3 and their catalytic performance for the condensation of isobutylene and isobutyraldehyde

Jie HE¹,Yining FAN²,

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

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Abstract Catalysts of Nb₂O₅/γ-Al₂O₃ were prepared by aqueous solution impregnation. The state of niobia species on surface of γ-Al₂O₃ is characterized by using the technology of X-ray power diffraction (XRD) and analyzed using the “incorporation model”. The acidity and the nature of acid sites of the catalysts were evaluated by means of Fourier transform infrared (FT-IR) spectroscopy of adsorbed pyridine. The catalytic activity of Nb₂O₅/γ-Al₂O₃ catalysts was evaluated by a condensation reaction from isobutene and isobutyraldehyde to 2,5-dimethyl-2,4-hexadiene. The results of XRD indicate that the dispersion capacity of niobia on γ-Al₂O₃ is about 0.76mmol Nb per 100m² γ-Al₂O₃, which is almost identical to the theoretical value (0.75mmol Nb per 100m²γ-Al₂O₃) calculated by the “incorporation model”. The results of Py-IR and catalytic activity evaluation indicate that the acidity feature is related to the state of dispersed niobia species as well as the loading of niobia onto the surface of γ-Al₂O₃ support.

Keywords niobia alumina dispersion capacity acidity olefin-aldehyde condensation

Issue Date: 05 March 2010

Cite this article:

Jie HE,Yining FAN. The state of the dispersed niobia species on γ-Al 2 O 3 and their catalytic performance for the condensation of isobutylene and isobutyraldehyde[J]. Front. Chem. China, 2010, 5(1): 109-112.

URL:

https://academic.hep.com.cn/fcc/EN/10.1007/s11458-009-0111-y
https://academic.hep.com.cn/fcc/EN/Y2010/V5/I1/109

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