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metadata.dc.type: | Artigo de Periódico |
Title: | Efficiency of zeolite MCM-22 with different SiO2/Al2O3 molar ratios in gas phase glycerol dehydration to acrolein |
Other Titles: | Microporous and Mesoporous Materials |
Authors: | Carriço, Camila Santana Cruz, Fernanda T. Santos, Maurício B. Pastore, Heloise de Oliveira Andrade, Heloysa Martins Carvalho Mascarenhas, Artur J. S. |
metadata.dc.creator: | Carriço, Camila Santana Cruz, Fernanda T. Santos, Maurício B. Pastore, Heloise de Oliveira Andrade, Heloysa Martins Carvalho Mascarenhas, Artur J. S. |
Abstract: | The gas-phase dehydration of glycerol was conducted over MCM-22 zeolite with different SiO2/Al2O3 molar ratios. MCM-22 zeolites were synthesized and characterized by XRD, FTIR, TG, SEM, EDX, textural analysis by N2 physisorption and NH3-TPD. The MCM-22 zeolites have presented good crystallinity, high surface areas and a decreased amount of acid sites and strength with increasing SiO2/Al2O3 ratio was observed. The glycerol conversion and acrolein selectivity increased with increasing reaction temperature from 280 °C to 320 °C on MCM-22 (30) catalyst. As long as the concentration of glycerol solution was in the range from 10% to 36.6%, there was no noticeable difference in the glycerol conversion but the acrolein yield increased with water amount in the feed. The glycerol conversion and selectivity to acrolein at 320 °C using glycerol feed of 36.6% during 10 h of reaction decreased in the following order: MCM-22 (30) > MCM-22 (50) > MCM-22 (80). This result shows that glycerol dehydration to acrolein is strongly dependent on the acid sites density and external surface area of the zeolite MCM-22. |
Keywords: | MCM-22 Dehydration of glycerol Sustainable production of acrolein |
metadata.dc.rights: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/14943 |
Issue Date: | 2013 |
Appears in Collections: | Artigo Publicado em Periódico (Química) |
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