Acid sites modulation of siliceous-based mesoporous material by post synthesis methods

Cristina Pizzolitto, Elena Ghedini, Somayeh Taghavi, Federica Menegazzo, Giuseppe Cruciani, Markus Peurla, Kari Eränen, Ivo Heinmaa, Atte Aho, Narendra Kumar, Dmitry Yu Murzin, Tapio Salmi, Michela Signoretto*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The present work is focused on the improvement of an effective approach to tailor the acidity of silica alumina composite. SBA-15 was selected based on high surface area, uniform porosity and large mesopores. Modification of SBA-15 was performed to improve both Lewis and Brønsted acidities and hence catalyst activity. Therefore, introduction of alumina as a co-catalyst was carried out to enhance Lewis acid sites through its incorporation into the silica network. Evaporation impregnation method was evaluated for incorporation of aluminium to SBA-15 and materials with different SiO2/Al2O3 ratios were prepared. Acidity and morphological features of the materials were assessed using XRD, EDX, SEM, TEM, N2-physisorption, 27Al MAS-NMR and FTIR with pyridine. Brønsted acidity was attained by the introduction of sulfonic acid groups in the final catalyst via the post-synthesis grafting method. Therefore, the balanced Lewis and Brønsted acidities and proper porosity of modified SBA-15 led to its efficient performance in the conversion of glucose as a biomass-based model component to levulinic acid.

Original languageEnglish
Article number111459
JournalMicroporous and Mesoporous Materials
Volume328
DOIs
Publication statusPublished - Dec 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Acid site modification
  • Brønsted acidity
  • Lewis acidity
  • Porosity
  • Promoted SBA-15

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