Cs-Beta with an Al-rich composition as a highly active base catalyst for Knoevenagel condensation

• Otomo, Ryoichi

• Osuga, Ryota

• Kondo, Junko N.

• Kamiya, Yuichi

• Yokoi, Toshiyuki

Abstract

Ion-exchange of an Al-rich zeolite beta, synthesized by organic structure-directing agent-free method (Beta-OF), was studied for application as a base catalyst. While the as-synthesized Beta-OF in Na-form itself had base sites and showed moderate catalytic activity for Knoevenagel condensation, the ion-exchange with Cs+ improved the catalytic activity. For Knoevenagel condensation of benzaldehyde with ethyl acetoacetate, the catalytic activity of Beta-OF ion-exchanged with Cs+ largely surpassed that of the conventional zeolite beta with less Al content. CO2-TPD and IR observation with chloroform as a probe molecule revealed that the Cs-exchanged Beta-OF had strong base sites comparable to Cs-exchanged Y zeolite. Base strength of Beta-OF was stronger than that expected by Sanderson's theory. A local high density of Al atoms in the framework of Beta-OF resulted in the unexpected base property and high catalytic activity.

Journal

• Applied catalysis A-general

  Applied catalysis A-general 575 20-24, 2019-04-05

  Elsevier

Keywords

• Beta
• Ion exchange
• Knoevenagel condensation
• OSDA-free
• Solid base

Details

• CRID: 1050287673798320128
• NII Article ID: 120007007925
• NII Book ID: AA10821202
• DOI: 10.1016/j.apcata.2019.02.014
• HANDLE: 2115/80825
• ISSN: 0926860X
• Web Site: https://api.elsevier.com/content/article/PII:S0926860X19300705?httpAccept=text/xml
• Web Site: https://api.elsevier.com/content/article/PII:S0926860X19300705?httpAccept=text/plain
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN