Preparation of SBA-15 and Zr-SBA-15 materials by direct-synthesis and pH-adjustment methods

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Colmenares Zerpa, J (Author) Other; Chimentao, RJ (Author) Other; Gispert Guirado, F (Author) Other; Peixoto, AF (Author) FCUP; Llorca, J (Author) Other

Journal

Title: Materials Letters

Vol. 301

ISSN: 0167-577X

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 7 Citations

Other information

Authenticus ID: P-00V-4SN

DOI: 10.1016/j.matlet.2021.130326

Abstract (EN): SBA-15 mesoporous silica materials with zirconium atoms incorporated into its structure were prepared by two methods: direct-synthesis and pH-adjustment. Two nominal ratios of Zr/Si = 0 and 0.10 were evaluated. N2physisorption, X-ray powder diffraction (XRPD) and, X-ray Photoelectron Spectroscopy (XPS) revealed that the morphology and structural order of the SBA-15 materials were greatly affected by the partial incorporation of zirconium into the SBA-15 structure as well as by the synthesis method. High-resolution transmission electron microscopy (HRTEM) of the materials prepared by pH-adjustment (SBA-15-2 and Zr-SBA-15-2 samples) revealed a more perfectly defined mesoporous structure with long-range ordering when compared with the materials obtained by direct-synthesis (SBA-15-1 and Zr-SBA-15-1 samples). The results by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Energy-Dispersion X-ray Spectroscopy (EDX) to evaluate the elemental composition of the materials indicated a better correlation using the pH-adjustment method.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4