Glycerol dehydration catalyzed by MWW zeolites and the changes in the catalyst deactivation caused by porosity modification

Author(s)

Rodrigues, Mariana V. ^[1] ; Vignatti, Charito ^[2] ; Garetto, Teresita ^[2] ; Pulcinelli, Sandra H. ^[1] ; Santilli, Celso V. ^[1] ; Martins, Leandro ^[1]

Affiliation

^[1] Inst Quim Araraquara UNESP, BR-14800900 Araraquara, SP - Brazil

^[2] Inst Invest Catalisis & Petroquim INCAPE, Catalysis Sci & Engn Res Grp GICIC, RA-2654 Santiago Del Estero, Santa Fe - Argentina

• Document type: Journal article
• Source: APPLIED CATALYSIS A-GENERAL; v. 495, p. 84-91, APR 5 2015.
• Web of Science Citations: 24

Abstract

Members of the layered MWW family, including microporous MCM-22, pillared MCM-36 and delaminated ITQ-2 zeolites, were used as catalysts for the gas phase dehydration of glycerol. The chemical, structural and surface properties of the catalysts were characterized by X-ray diffraction, N-2 adsorption-desorption isotherms, SEM, TEM, NH3-TPD and pyridine chemisorption followed by IR spectroscopy. The results clearly showed that the modified zeolites with designed mesopore structure enabled rapid diffusion and consequently improved the glycerol conversion. Characterization of the acid sites revealed that the relative abundance of Bronsted and Lewis acid sites influenced the efficiency of the catalysis performed by these materials. C-13 NMR spectra of the spent catalysts confirmed that differences in the nature and amount of carbonaceous deposits are related to the pore structures of the catalysts, with greater formation of polyaromatic compounds inside zeolite pores, while polyglycols are preferentially formed at the external surfaces of the MCM-36 and ITQ-2 zeolites, as expected for the more exposed sheets. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 13/01328-0 - Advanced synthesis methodologies of hierarchical zeolites and characterization by different techniques for improved use of microporous materials in heterogeneous catalysis
• Grantee: Leandro Pierroni Martins
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/08305-2 - Active sites accessibility and catalyst deactivation in the glycerol dehydration using lamellar zeolites
• Grantee: Mariana Veiga Rodrigues
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 13/08541-0 - Active sites accessibility and catalyst deactivation in the glycerol dehydration using lamellar zeolites
• Grantee: Mariana Veiga Rodrigues
• Support Opportunities: Scholarships abroad - Research Internship - Master's degree
• FAPESP's process: 10/01449-3 - Development of porous heterogeneous catalysts for the conversion of renewable feedstocks
• Grantee: Leandro Pierroni Martins
• Support Opportunities: Research Grants - Young Investigators Grants