Al-Rich Ordered Mesoporous Silica SBA-15 Materials: Synthesis, Surface Characterization and Acid Properties

Talha, Zoulikha; Bachir, Cherifa; Ziri, Sarah; Bellahouel, Salima; Bengueddach, Abdelkader; Villièras, Frédéric; Pelletier, Manuel; Weidler, Peter G.; Hamacha, Rachida

doi:10.1007/s10562-017-2103-8

Cited by 24 publications

(27 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was accompanied by a change of the average mesopore diameter from 7.1 to 6.7-6.8 nm (accuracy ± 0.1). This results from aluminum deposits in micropores and few aluminum deposits inside the mesopores and agrees with observations of other authors (Talha et al 2017).…”

Section: Physico-chemical Characterizationsupporting

confidence: 94%

“…Figure S1 shows typical diffraction patterns of MFI-type zeolites, without reflections due to competing phases. The small angle X-ray diffraction patterns of SBA-15 and aluminum modified SBA-15 show the typical reflections of the hexagonal symmetry known from literature (Talha et al 2017). Thus, the phase purity of both micro-and mesoporous materials was confirmed.…”

Section: Physico-chemical Characterizationsupporting

confidence: 67%

See 1 more Smart Citation

Effect of aluminum and sodium on the sorption of water and methanol in microporous MFI-type zeolites and mesoporous SBA-15 materials

Rieg

Beurer

et al. 2020

Adsorption

View full text Add to dashboard Cite

The interaction and nature of surface sites for water and methanol sorption on MFI-type zeolites and mesoporous SBA-15 were investigated by solid-state NMR spectroscopy and correlated with the desorption enthalpies determined via TGA/DSC. For siliceous Silicalite-1, 29Si CPMAS NMR studies support stronger methanol than water interactions with SiOH groups of Q3-type. On siliceous SBA-15, SiOH groups of Q2-type are accompanied by an enhanced hydrophilicity. In aluminum-containing Na-ZSM-5, Na+ cations are strong adsorption sites for water and methanol as evidenced by 23Na MAS NMR in agreement with high desorption enthalpies of ΔH = 66–74 kJ/mol. Solid-state NMR of aluminum-containing Na-[Al]SBA-15, in contrast, has shown negligible water and methanol interactions with sodium and aluminum. Desorption enthalpies of ΔH = 44–60 kJ/mol hint at adsorption sites consisting of SiOH groups influenced by distant framework aluminum. On H-ZSM-5, Brønsted acidic OH groups are strong adsorption sites as indicated by partial protonation of water and methanol causing low-field shifts of their 1H MAS NMR signals and enhanced desorption enthalpies. Due to the small number of Brønsted acid sites in aluminum-containing H-[Al]SBA-15, water and methanol adsorption on this material is suggested to mainly occur at SiOH groups with distant framework aluminum species, as in the case of Na-[Al]SBA-15.

show abstract

Section: Physico-chemical Characterizationsupporting

confidence: 94%

Section: Physico-chemical Characterizationsupporting

confidence: 67%

Effect of aluminum and sodium on the sorption of water and methanol in microporous MFI-type zeolites and mesoporous SBA-15 materials

Rieg

Beurer

et al. 2020

Adsorption

View full text Add to dashboard Cite

show abstract

“…In the Al-MCM-standard, the reflection peaks (110) and (200) observed in Si-MCM-41 were not well developed, indicating more disordered arrangement of channels for the Al-MCM-standard, however an hexagonal structure with good regularity was kept. It has already been proved that the introduction of an heteroatom affect the structural order of mesoporous solids and more the aluminium content is high more the structural effect is high [35]. In contrast, the synthesis of Al-MCM-bentonite from the dissolution of the silicon and aluminum species that exist in bentonite using the fusion method provides a well-ordered mesoporous material with hexagonal regularity characterized by better resolved of the peaks (110), (200), (210), and (300).…”

Section: Structural Discussion Of Catalystmentioning

confidence: 99%

Comparison of Lewis Acidity between Al-MCM-41 Pure Chemicals and Al-MCM-41 Synthesized from Bentonite

Ali-Dahmane

Brahmi

Hamacha

et al. 2019

Bull. Chem. React. Eng. Catal.

Self Cite

View full text Add to dashboard Cite

This study focused on the Lewis acidity of Al-MCM-41 prepared from bentonite (Al-MCM-bentonite) as silica and aluminum source simultaneously. This acidity was compared with Al-MCM-41 synthesized from pure chemicals reagents (Al-MCM-standard). Structural analysis showed that the substitution of the silicon atom by the aluminum atom decreases the structural order of Al-MCM-standard, whereas Al-MCM-bentonite has a better structural organization. The Lewis acidity of the Al-MCM-bentonite was evaluated in allylation reaction of benzaldehyde with allyltrimethylsilane and pyridine adsorption experiments. The results showed that the difference in acidity between Al-MCM-standard and Al-MCM-bentonite is due to the amount of aluminum incorporated into the framework of our mesoporous materials. According to the EDX analysis, the incorporation of aluminum in Al-MCM-standard (Si/Al = 13.47) is more important than in Al-MCM-bentonite (Si/Al = 43.64). This explains the low acidity of Al-MCM-bentonite, and the moderate yields in the allylation reactions of benzaldehyde with allyltrimethylsilane.

show abstract

“…If the solution pH is below the pH PZC , the opposite phenomenon takes place; the surface is positively charged and anionic species are adsorbed on it. For AlSBA-15 and BEA, pH PZC is reported to be about 5 [64] and 6, respectively [65]. Thus, due to the protonation of AlSBA-15 and BEA surface at the conditions of using impregnating solution of H 2 PtCl 6 with pH amounting 2, the [PtCl 6 ] 2− anions are attracted to the surface of both supports.…”

Section: Catalysts Characterisationmentioning

confidence: 98%

Promotional Effect of Pd Addition on the Catalytic Activity of Composite Pt-Pd/AlSBA-15–β Catalyst for Enhanced n-Heptane Hydroisomerization

et al. 2021

View full text Add to dashboard Cite

Hierarchical AlSBA-15–zeolite materials were utilized as a supports for preparing hydroisomerization catalysts. Detailed consideration was given to: (i) the effect of the zeolite type introduced into AlSBA-15–zeolite composites (where zeolite is β, mordenite or ZSM-5) as well as (ii) the promotion effect of Pd addition. The composites showed higher activity in isomerization as compared to Pt/AlSBA-15. The enhanced isomerization efficiency were explained by the appropriate metallic and acidic function as well as suitable transport properties. The modification of the hydrogenating function by Pd incorporation increases the hydroisomerization efficiency of Pt-Pd/AlSBA-15–β catalyst. Over bimetallic Pt-Pd/AlSBA-15–β, the high yields of isomers (68 wt%) with respect to 50 wt% for a control catalyst. The most promising Pt-Pd/AlSBA-15–β catalyst allows to improve research octane number from 0 to the 74 value.

show abstract

Al-Rich Ordered Mesoporous Silica SBA-15 Materials: Synthesis, Surface Characterization and Acid Properties

Cited by 24 publications

References 52 publications

Effect of aluminum and sodium on the sorption of water and methanol in microporous MFI-type zeolites and mesoporous SBA-15 materials

Effect of aluminum and sodium on the sorption of water and methanol in microporous MFI-type zeolites and mesoporous SBA-15 materials

Comparison of Lewis Acidity between Al-MCM-41 Pure Chemicals and Al-MCM-41 Synthesized from Bentonite

Promotional Effect of Pd Addition on the Catalytic Activity of Composite Pt-Pd/AlSBA-15–β Catalyst for Enhanced n-Heptane Hydroisomerization

Contact Info

Product

Resources

About