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|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.
|Keywords: ||MCM-22;Dehydration of glycerol;Sustainable production of acrolein|
|Issue Date: ||2013|
|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.|
|Description: ||Texto completo: acesso restrito. p. 74–82|
|Appears in Collections:||Artigos Publicados em Periódicos (Quimica)|
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