MFI and FAU embryonic embryonic zeolites: synthesis and catalytic properties

• Grant number: 18/20670-4
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Start date: February 01, 2019
• End date: January 31, 2020
• Field of knowledge: Engineering - Chemical Engineering - Chemical Technology
• Principal Investigator: Leandro Pierroni Martins
• Grantee: Laura Lorena da Silva
• Supervisor: Carsten Sievers
• Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Institution abroad: Georgia Institute of Technology, United States
• Associated to the scholarship: 17/21965-5 - Synthesis and catalytic uses of embryonic zeolites possessing acidic ou basic sites, BP.PD

Abstract

Zeolites are an important class of materials with many applications, among them the use in basic or acidic heterogeneous catalysis, depending on the control of the physical and chemical properties during or after their synthesissyntheses. Several modifications have already been extensively made in the zeolites, such as syntheses of crystals of nanometric dimensions and zeolitic slides obtained with the use of organosilanes, all with the aim of reducing the diffusion restrictions and increasing the catalytic performance. Currently, the embryonic zeolites, which are partially formed and with their extremely accessible active sites, appear as a new material to be explored with innumerable and not evaluated synthesis syntheses conditions, including the characteristics kinetic study of theirof the material under formation. Therefore, the present work aims to amplify the synthesis parameters in order to obtain the embryonic zeolites of the MFI and FAU structure with different Si/Al ratios and to evaluate the accessibility, activity of their acidic sites and its structural stability. The embryonic zeolites will be synthesized evaluating the time, temperature and aging of synthesis, and then characterized to establish the relation property-function synthesis with the objective of finding embryonic structures with specific application for a certain catalytic function. Finally, the catalytic activity of the embryonic and also of the crystalline zeolites will be evaluated through the reaction of dihydroxyacetone isomerization to lactic acid. Thus, the structural and morphological characteristics, besides the chemical composition of each zeolite, can be evaluated and correlated to catalytic activity, accessibility to acid sites and stability.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SILVA, LAURA LORENA; CARDOSO, DILSON; SIEVERS, CARSTEN; MARTINS, LEANDRO. Evolution of Structure and Active Sites during the Synthesis of ZSM-5: From Amorphous to Fully Grown Structure. Journal of Physical Chemistry C, v. 124, n. 4, p. 2439-2449, JAN 30 2020. (18/01258-5, 18/03710-2, 17/21965-5, 18/20670-4)

SILVA, LAURA L.; STELLATO, MICHAEL J.; RODRIGUES, MARIANA V.; HARE, BRYAN J.; KENVIN, JEFFREY C.; BOMMARIUS, ANDREAS S.; MARTINS, LEANDRO; SIEVERS, CARSTEN. Reduced deactivation of mechanochemically delaminated hierarchical zeolite MCM-22 catalysts during 4-propylphenol cracking. JOURNAL OF CATALYSIS, v. 411, p. 6-pg., 2022-07-01. (17/21965-5, 18/20670-4, 18/01258-5)

SILVA, LAURA L.; FLORINDO, BIANCA R.; CATUZO, GABRIEL L.; ZAPELINI, IAGO W.; CRADSO, JOAS VICTOR. S.; LUNA, F. MURILO T. .; CAVALCANTE JR., CELIO L.; MARTINS, LEANDRO. Investigation of the secondary porosity in ill-crystallized or desilicated ZSM-5 zeolites and its performance on MTH reaction. MOLECULAR CATALYSIS, v. 529, p. 10-pg., 2022-08-06. (18/20670-4, 17/21965-5, 19/12486-1, 19/09078-9, 18/01258-5, 18/21136-1)