A high performance co-precipitation CdAl₂O₄ catalyst for the isomerization of dipotassium 1,8-naphthalenedicarboxylate

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• 作者：Guoqiang Wu ; Wenjun Wang ; Lei Cai…
• 关键词：Dipotassium 1 ; 8 ; naphthalenedicarboxylate ; Isomerization ; Co ; precipitation ; CdAl2O4
• 刊名：Reaction Kinetics, Mechanisms and Catalysis
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：119
• 期：2
• 页码：523-535
• 全文大小：587 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Industrial Chemistry and Chemical Engineering
  Physical Chemistry
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1878-5204
• 卷排序：119

文摘

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.