A comparative solid state C-13 NMR and thermal study of CO2 capture by amidines PMDBD and DBN

Author(s)

Pereira, Fernanda Stuani ^{[1, 2]} ; da Silva Agostini, Deuber Lincon ^{[1, 2]} ; do Espirito Santo, Rafael Dias ^{[1, 2]} ; deAzevedo, Eduardo Ribeiro ^[3] ; Bonagamba, Tito Jose ^[3] ; Job, Aldo Eloizo ^[1] ; Perez Gonzalez, Eduardo Rene ^[1]

Affiliation

^[1] Univ Estadual Paulista, Dept Fis Quim & Biol, Lab Quim Organ Fina, BR-19060900 Presidente Prudente, SP - Brazil

^[2] Univ Estadual Paulista, Programa Posgrad Ciencia & Tecnol Mat POSMAT, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: GREEN CHEMISTRY; v. 13, n. 8, p. 2146-2153, 2011.
• Web of Science Citations: 21

Abstract

The present work shows study of the CO(2) capture by amidines DBN and PMDBD using (13)C solid-state NMR and thermal techniques. The solid state (13)C NMR analyses demonstrate the formation of a single PMDBD-CO(2) product which was assigned to stable bicarbonate. In the case of DBN, it is shown that two DBN-CO(2) products are formed, which are suggested to be stable bicarbonate and unstable carbamate. The role of water in the DBN-CO(2) capture as well as the stability of the products to environmental moisture was also investigated. The results suggest that the carbamate formation is favored in dry DBN, but in the presence of water it decompose to form bicarbonate. Thermal analysis shows a good gravimetric CO(2) absorption of DBN. Release of CO(2) was found to be almost quantitative from the PMDBDH(+) bicarbonate about 110 degrees C. (AU)

• FAPESP's process: 06/51987-6 - Study of the carbon dioxide molecule attachment and activation with nitrogen bases
• Grantee: Eduardo Rene Perez Gonzalez
• Support Opportunities: Research Grants - Young Investigators Grants