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. 2020 Mar 10;10(17):10144-10154.
doi: 10.1039/d0ra00349b. eCollection 2020 Mar 6.

The design, synthesis and catalytic performance of vanadium-incorporated mesoporous silica with 3D mesoporous structure for propene epoxidation

Agnieszka Held  1 , Ewa Janiszewska  1 , Justyna Czerepińska  1 , Jolanta Kowalska-Kuś  1
Affiliations

The design, synthesis and catalytic performance of vanadium-incorporated mesoporous silica with 3D mesoporous structure for propene epoxidation

Agnieszka Held et al. RSC Adv. .

Abstract

V-containing mesoporous silica with 3D structure was prepared by a hydrothermal procedure using NH4VO3 as the vanadium precursor and with varied reaction mixture pH values (pH = 3 and pH = 5). The combined use of DR UV-vis and H2-TPR techniques confirmed the successful incorporation of vanadium into the structure of the mesoporous silica material. The number of acid sites, evidenced by ammonia TPD, strongly correlates with the vanadium content. Propene oxidation with N2O revealed the noticeable activity of the synthesised vanadium-containing mesoporous materials in epoxidation reactions. The activity of the synthesized vanadosilicates is compared with the performance of vanadium-supported catalysts (on mesoporous silica of 3D structures) prepared by wet-impregnation method. On the basis of TOF analysis indicating the activity of particular vanadium ions, it was evidenced that although the presence of isolated V species is crucial in propene epoxidation, the availability of the active species is of paramount importance for proper vanadium utilization.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. Low-angle XRD patterns of parent and V-containing materials: (A) KIT-6, (B) SBA-12, and (C) MCF.
Fig. 2
Fig. 2. The N2 adsorption/desorption isotherms of the indicated samples with: (A) KIT-6, (B) SBA-12, and (C) MCF structures.
Fig. 3
Fig. 3. Pore size distributions of the indicated samples with: (A) KIT-6, (B) SBA-12, and (C) MCF structures.
Fig. 4
Fig. 4. TEM images of the indicated samples.
Fig. 5
Fig. 5. SEM images of the indicated samples.
Fig. 6
Fig. 6. Normalized H2-TPR profiles of the indicated samples with: (A) KIT-6, (B) SBA-12, and (C) MCF structures.
Fig. 7
Fig. 7. UV-vis reflectance spectra of the indicated dehydrated samples with: (A) KIT-6, (B) SBA-12, and (C) MCF structures.
Fig. 8
Fig. 8. Normalized NH3-TPD profiles of calcined samples with: (A) KIT-6, (B) SBA-12, and (C) MCF structures.
Fig. 9
Fig. 9. Catalytic activity, expressed in terms of (A) propene conversion and (B) selectivity to propene oxide, of the indicated samples in propene epoxidation at different reaction temperatures.
Fig. 10
Fig. 10. Selectivity towards oxygen-bearing products (PA: propionaldehyde, ACT: acetone, ACR: acrolein, and COx: CO, CO2) of the indicated samples in propene epoxidation at different reaction temperatures.
Fig. 11
Fig. 11. (A) Catalytic activity (propene conversion, selectivity towards PO, and PO yield) and (B) selectivity towards oxygen-bearing products (PA-propionaldehyde, ACR-acrolein, ACT-acetone, and COx) of the indicated catalysts in propene epoxidation at 653 K.
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