Abstract
CdO and co-precipitation CdAl2O4 (PreCdAl2O4) catalysts were prepared and used in the isomerization reaction of dipotassium 1,8-naphthalenedicarboxylate. The catalyst samples were characterized by X-ray powder diffraction, scanning electron microscopy, inductively coupled plasma, nitrogen physical adsorption, Fourier transform infrared, X-ray photoelectron spectrum and NH3-temperature programmed desorption. The results reveal that the crystal structure of all samples is almost unchanged. However, compared with CdO, the PreCdAl2O4 catalysts exhibit a smaller particle size and stronger acid. This feature may be attributed to the fact that a small amount of Al atoms are introduced into the catalyst structure in the synthesis process of CdAl2O4 by co-precipitation method. Furthermore, the effects of different catalyst, calcination temperature of catalyst, Cd/Al molar ratio of PreCdAl2O4 catalysts and reaction temperature on the isomerization reaction were investigated. The experimental results show that the optative catalyst was PreCdAl2O4-0.95 of calcination at 673 K. Meanwhile, a dipotassium 2,6-naphthalenedicarboxylate selectivity of 90.6 % and dipotassium 1,8-naphthalenedicarboxylate conversion of 98.0 % was obtained when this reaction was carried out at 723 K for 2 h in 1.5 MPa CO2 atmosphere.
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This work is supported by the Ph.D. Starting Foundation of Jiangxi Agricultural University (09004712) and Jiangxi Provincial Department of Education Fund (GJJ150432).
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Wu, G., Wang, W., Cai, L. et al. A high performance co-precipitation CdAl2O4 catalyst for the isomerization of dipotassium 1,8-naphthalenedicarboxylate. Reac Kinet Mech Cat 119, 523–535 (2016). https://doi.org/10.1007/s11144-016-1071-0
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DOI: https://doi.org/10.1007/s11144-016-1071-0