Mesoporous alumina of controlled pore size obtained by surface alumination of pure silica SBA-15

Rochefoucauld, Emmanuel de la; Carrier, Xavier; Krafft, Jean‐Marc; Blanchard, Juliette

doi:10.1016/s0167-2991(06)80885-2

Cited by 3 publications

(6 citation statements)

References 19 publications

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“…It exhibits a high specific surface area (800 m 2 g −1 ), high pore volume and a tuneable acidity controlled by the targeted Si/Al ratio. [23][24][25] In addition, the relatively thick walls of the SBA-15 ensure a good thermal and hydrothermal stability. 26,27 Postsynthesis alumination of SBA-15 by Al isopropoxide precursors has been shown to result in an Al incorporation mainly in tetrahedral positions and no extra framework Al.…”

Section: Introductionmentioning

confidence: 99%

Influence of intimacy for metal-mesoporous solid acids catalysts forn-alkanes hydro-conversion

Harmel

Wal

Zečević

et al. 2020

Catal. Sci. Technol.

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Section: Introductionmentioning

confidence: 99%

Influence of intimacy for metal-mesoporous solid acids catalysts forn-alkanes hydro-conversion

Harmel

Wal

Zečević

et al. 2020

Catal. Sci. Technol.

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“…Morevoer, the existence of tetrahedral Al is clear evidence that parts of Al atoms are implanted into the siliceous skeleton of TUD-1 analogous to the assembly of Al-TUD-1. of PAT-1 to PAT-4, which means that a pure material TUD-1 can be gradually modified in its physicochemical properties by grafting Al species onto its surfaces [36,37]. This might be explained by the SEM results, in which the volume of bulk particles packed onto the surface increases with the increase of aluminum content in the synthesis process.…”

Section: Py-ir Characterization Of the Support Additivesmentioning

confidence: 98%

“…However, the well scattered MoO 3 nanocrystalline phases with suitable stacks are conducive to the generation of "type II" active phases, which could produce sufficient brim and edge sites for the HDS reaction [40], while the weak MSI facilitates the generation of small piled MoO 3 crystals. of PAT-1 to PAT-4, which means that a pure material TUD-1 can be gradually modified in its physicochemical properties by grafting Al species onto its surfaces [36,37]. This might be explained by the SEM results, in which the volume of bulk particles packed onto the surface increases with the increase of aluminum content in the synthesis process.…”

Section: Py-ir Characterization Of the Support Additivesmentioning

confidence: 98%

“…The chemical shift of the tetra-coordinated Al at δ = 58 is less than that of bulk γ-Al 2 O 3 (the peak at δ = 65 ppm), indicating the existence of Al-O-Si bonds due to the Al elements implanted into the framework [34,35]. The peak at δ = 30 ppm explains the presence of an amorphous alumina phase [36]. From Figure 6, it can be seen that the intensity of the pentacoordinated Al increases with the increase of Al in the alumination process from the materials of PAT-1 to PAT-4, which means that a pure material TUD-1 can be gradually modified in its physicochemical properties by grafting Al species onto its surfaces [36,37].…”

Section: Py-ir Characterization Of the Support Additivesmentioning

confidence: 99%

“…The peak at δ = 30 ppm explains the presence of an amorphous alumina phase [36]. From Figure 6, it can be seen that the intensity of the pentacoordinated Al increases with the increase of Al in the alumination process from the materials of PAT-1 to PAT-4, which means that a pure material TUD-1 can be gradually modified in its physicochemical properties by grafting Al species onto its surfaces [36,37]. This might be explained by the SEM results, in which the volume of bulk particles packed onto the surface increases with the increase of aluminum content in the synthesis process.…”

Section: Py-ir Characterization Of the Support Additivesmentioning

confidence: 99%

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Post Synthesis of Aluminum Modified Mesoporous TUD-1 Materials and Their Application for FCC Diesel Hydrodesulfurization Catalysts

Xia

Duan

et al. 2017

Catalysts

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Post-synthesis methods are a promising technology and have received much attention. In this paper, a series of post-synthesis aluminum modified TUD-1 (PAT) materials with different Al contents were successfully prepared by using aluminum isopropoxide to be Al sources, then the as-synthesized materials were adopted as support additives mixed with commercial γ-Al 2 O 3 to prepare hydrodesulfurization (HDS) catalysts for FCC diesel. The supports and catalysts were analyzed using N 2 adsorption-desorption, XRD, SEM, Py-IR, ICP, 27 Al MAS NMR, UV-vis, H 2 -TPR and HRTEM techniques. The results of Py-IR and 27 Al MAS NMR indicated that the addition of Al species could bring Lewis (L) and Brönsted (B) sites into Si-TUD-1, and that the material of PAT-3 had the highest total acidity sites and Brönsted acid sites among the series PAT composites. The HRTEM technique showed that, compared to the traditional catalyst NiMo/γ-Al 2 O 3 , the sulfided catalyst NiMo/APAT-3 had a relatively short length (3.2 nm) and suitable stacking number (2.5) of MoS 2 slabs. The HDS efficiencies of all the catalysts were tested in a fixed bed micro-reactor with FCC diesel as feedstock. The catalytic results confirmed that the catalyst NiMo/APAT-3 possessed the highest HDS efficiency (97.0%), due to synergistic effects of advantageous properties such as higher acidity, moderate MSI, and relatively short length of the MoS 2 slabs.

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Grafting of Alumina on SBA-15: Effect of Surface Roughness

2008

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Alumina-grafted materials were prepared by postsynthesis alumination of mesoporous SBA-15 silica in an aqueous solution of aluminum chlorhydrol. Prepared samples were characterized by nitrogen adsorption, scanning electron microscopy, X-ray powder diffraction, and (27)Al magic-angle-spinning NMR. The successive grafting of alumina on SBA-15 leads to a gradual filling of the corona surrounding the mesopores. As a consequence smoothing of the mesopore surface takes place. The in-depth analysis of nitrogen adsorption data proves that the alpha s method affords real values of the structure parameters, while the Kruk, Jaroniec, and Sayari (KJS) procedure based on the BJH algorithm provides only effective data corresponding to cylindrical mesopores of smooth geometrical surface. The quantification of the roughness of the SBA-15 mesopore surface based on the comparison of data obtained from the alpha s plot and KJS method was carried out.

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Mesoporous alumina of controlled pore size obtained by surface alumination of pure silica SBA-15

Cited by 3 publications

References 19 publications

Influence of intimacy for metal-mesoporous solid acids catalysts forn-alkanes hydro-conversion

Influence of intimacy for metal-mesoporous solid acids catalysts forn-alkanes hydro-conversion

Post Synthesis of Aluminum Modified Mesoporous TUD-1 Materials and Their Application for FCC Diesel Hydrodesulfurization Catalysts

Grafting of Alumina on SBA-15: Effect of Surface Roughness

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