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

Controlling the porosity and crystallinity of MgO catalysts by addition of surfactant in the sol-gel synthesis

Full text
Author(s):
Possato, Luiz G. [1] ; Pereira, Elen [1] ; Goncalves, Rosembergue G. L. [1] ; Pulcinelli, Sandra H. [1] ; Martins, Leandro [1] ; Santilli, Celso V. [1]
Total Authors: 6
Affiliation:
[1] Univ Estadual Paulista UNESP, Inst Quim, Campus Araraquara, Rua Prof Francisco Degni 55, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: CATALYSIS TODAY; v. 344, n. SI, p. 52-58, MAR 15 2020.
Web of Science Citations: 0
Abstract

This study presents an easy route to induce pore formation, increase the specific surface area and control the crystallite size of magnesium oxides obtained using the sol-gel method with addition of Pluronic P123 surfactant. The structural characteristics of the materials were evaluated using X-ray diffraction, N-2 physisorption isotherms, mercury intrusion porosimetry, scanning electron microscopy and CO2 temperature programmed desorption. The catalytic properties were assessed using the Knoevenagel condensation reaction. The results showed a systematic decrease of the magnesium oxide crystallinity with increased concentration of the surfactant used in the synthesis. This was associated with increase of the magnesium oxide BET area from 2 m(2)/g to over 50 m(2)/g, as well as the formation of pores in the macropore region, as confirmed by microscopy images. In addition, the surface modification resulted in CO2 chemisorption increasing from 378 mu mol/g, for the pristine MgO sample, to 1529 mu mol/g, for the porous sample, accompanied by an increase in the concentration of strong basic sites. The most porous sample presented the highest catalytic activity in the Knoevenagel condensation reaction. (AU)

FAPESP's process: 10/01449-3 - Development of porous heterogeneous catalysts for the conversion of renewable feedstocks
Grantee:Leandro Martins
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 16/12752-5 - Study of MgO formation with hierarchical pores system as a catalyst for ethanol steam reforming
Grantee:Luiz Gustavo Possato
Support Opportunities: Scholarships in Brazil - Post-Doctorate