Oxidation of ketones over metal oxide catalysts. II. Biacetyl synthesis over Co3O4-lanthanoid oxide catalysts.

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概要

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• The effects of the addition (10 atomic%) of lanthanoid oxides into Co<SUB>3</SUB>O<SUB>4</SUB> on the oxidation of methyl ethyl ketone (MEK) were studied. The addition of La<SUB>2</SUB>O<SUB>3</SUB> brought about marked enhancement of the rate of biacetyl (BA) formation. MEK conversion increased by a factor of 2.8 and the BA selectivity was improved at 450–500K owing to the suppression of deep oxidation. The addition of CeO<SUB>2</SUB> much improved the MEK conversion but BA selectivity decreased to less than 50% and the scission reaction leading to acetaldehyde and acetic acid was enhanced. The addition of Pr<SUB>6</SUB>O<SUB>11</SUB> improved MEK conversion but the addition of Nd<SUB>2</SUB>O<SUB>3</SUB>, Gd<SUB>2</SUB>O<SUB>3</SUB>, or Er<SUB>2</SUB>O<SUB>3</SUB> showed little effect on MEK conversion. The reduction of both scission reaction and deep oxidation and the compensative increase in BA selectivities were observed. An approximately linear relationship was found between the specific rate of BA formation of the catalysts and logarithmic solubitity product constants of hydroxides of tervalent lanthanoid elements added, suggesting that the basicity of the catalysts is one of major factors for BA formation. The maximum efficiency (23.4%) of BA formation was attained at a La content of ca. 10 at.%.

• 公益社団法人 日本化学会の論文

著者

• Takita Yusaku

  Department Of Applied Chemistry Faculty Of Engineering Oita University

• Hori Fumiaki

  Department Of Environmental Chemistry And Engineering Faculty Of Engineering Oita Unviersity

• YAMAZOE Noboru

  Department of Energy and Material Sciences, Faculty of Engineering Science, Kyushu University

• Takita Yusaku

  Department of Environmental Chemistry and Engineering, Faculty of Engineering, Oita University

• Seiyama Tetsuro

  Department of Materials Science and Technology, Graduate School of Engineering Science, Kyushu University

• Seiyama Tetsuro

  Department of Alaterials Science and Technology, Faculty of Engineering, Kyushu University

• Takita Yusaku

  Department of Alaterials Science and Technology, Faculty of Engineering, Kyushu University

• Yamazoe Noboru

  Department of Alaterials Science and Technology, Faculty of Engineering, Kyushu University

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