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Modification of the Acid-base and Catalytic Properties of CuCl2-KCl-LaCl3/-Al2O3 by MgAl2O4 in Ethane Oxychlorination

Liu J., Sui Y., Zhou G., Zhen K., Zhang X., Cheng T.

Polish Journal of Chemistry

2007

Vol. 81, nr 1

95-101

Effect of MgAl2O4 on the structure, acidity as well as catalytic activity of CuCl2-KCl-LaCl3/gamma-Al2O3 catalyst in ethane oxychlorination was studied. Impregnation of gamma-Al2O3 with Mg and Al nitrates formed magnesium aluminate spinel on the support. TPR results showed that Cu species were located on both -Al2O3 and MgA gamma2O4 phases. With modification of -Al2O3 by MgAl2O4, the interaction between Cu species and support weakened and the surface active species CuCl2 increased. Formation of MgA gamma2O4 leads to a decrease of strong acid sites and an increase of weak acid sites. Much larger quantities of coke were deposited on the CuCl2-KCl-LaCl3/gamma-Al2O3 than on the modified catalyst, which was attributed to its more strong acid sites. Based on these factors CuCl2-KCl-LaCl3/MgAl2O4-Al2O3 catalyst exhibits better catalytic activity and stability than gamma-Al2O3 supported catalyst, and the highest vinyl chloride selectivity reached 46.8% and was still 40.6% after 210 h reaction.

Oksychlorowanie etylenu w syntezie chlorku winylu (VC)

German K.

Chemik

2006

Vol. 59, nr 4

242-247

Na podstawie przeglądu publikacji, przedstawiono technologię oksychlorowania węglowodorów na przykładzie dyskusji warunków i wyników technologii oksychlorowania etylenu realizowanego w instalacji syntezy chlorku winylu (VC).

On the basis of published papers reviewed it was shown technology of hydrocarbons oxychlorination by discussing conditions and results of ethylene oxychlorination technology being realised in a vinyl chloride (VC) installation.