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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Synthesis and characterization of chromium silicate catalyst and its application in the gas phase glycerol transformation into acetaldehyde

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Luizon Filho, Roberto A. [1] ; Possato, Luiz G. [2] ; Santisteban, Oscar A. N. [1] ; de Vasconcellos, Adriano [1] ; da Silva, Danilo A. [1] ; Lima, Marcelo F. [3] ; Martins, Leandro [2] ; Nery, Jose G. [1]
Total Authors: 8
[1] Sao Paulo State Univ UNESP, Phys Dept, Campus Sao Jose Rio Preto, BR-15054000 Sao Paulo - Brazil
[2] Sao Paulo State Univ UNESP, Inst Chem, Biochem & Technol Dept, Campus Araraquara, BR-14800060 Sao Paulo - Brazil
[3] Sao Paulo State Univ UNESP, Dept Chem & Environm Sci, Campus Sao Jose Rio Preto, BR-15054000 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Inorganic Chemistry Communications; v. 112, FEB 2020.
Web of Science Citations: 0

Chromium silicates with MFI topology were hydrothermally synthesized, characterized, and applied as heterogeneous catalysts on the one-step gas-phase glycerol conversion into acetaldehyde and acrolein. The catalysts were characterized by XRD, SEM, FT-IR, ICP-OES, XPS, pyridine adsorption, nitrogen adsorption/desorption, and TGA. The experimental results showed that the use of chromium led to a zeolite containing surface-active species and framework chromium atoms, which were identified by XPS analysis, and named as Cr(1), Cr(2) and Cr(3) species. The catalytic reactions with CrMFI-H exhibited high glycerol conversion (97%), and the main products were acetaldehyde (30%) and acrolein (10%). The high yield of acetaldehyde was due to oxidation reactions taking place in Cr(3) species. A reaction pathway for the formation of acetaldehyde was proposed, and the DFT calculations corroborated the proposed mechanism. In comparison with MFI-H catalysts, reactions with CrMFI-H led to the formation or deposition of a negligible amount of coke (less than 3 wt%) either under O-2 or N-2 atmosphere. This study highlights the advantage of combining acid and redox sites in a single catalyst because the redox sites not only assist the selective conversion of glycerol but also participate in the oxidation of monomeric coke species before they polymerize and block the pores of the catalysts. (AU)

FAPESP's process: 18/01258-5 - Novel chemical catalytic and photocatalytic processes for the direct conversion of methane and CO2 to products
Grantee:José Maria Correa Bueno
Support type: Research Projects - Thematic Grants
FAPESP's process: 11/51851-5 - Syntheses and characterization of nanozeolites-enzymes complexes and their use as heterogeneous catalysts in the production of biodiesel by trans esterification of Palm Oil and algae oils (Dunaliella Salina and Haematococcus pluvialis) with ethanol
Grantee:Jose Geraldo Nery
Support type: Regular Research Grants
FAPESP's process: 18/17588-4 - Evaluation of Ni-Cu behavior supported on porous MgO for ethanol steam reforming by X-ray Absorption Spectroscopy
Grantee:Luiz Gustavo Possato
Support type: Scholarships abroad - Research Internship - Post-doctor