Synthesis of sulfated zirconia catalyst using sol–gel technique for alkane isomerization

Kumar, Amit; Priyanka, .; Mangalam, Jimmy; Yadav, Vandana; Goswami, Debabrata

doi:10.1007/s11144-022-02254-2

Cited by 3 publications

(2 citation statements)

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“…The peaks appearing in the hydroxyl region (3200-3600 cm −1 region) of both composite catalysts and their corresponding acid solids are due to the water molecules bounded on the ZrO 2 surface forming surface-bound hydroxyl groups (OH w ). The broad bands with the maximum centered at 3369 cm −1 and at 3270 cm −1 are attributed to the vibration bands of the hydroxyl group of the physisorbed water and hydroxides [42,43], which are accompanied with one band situated at 1636 cm −1 (not shown here) assigned to the bending mode of adsorbed water. It should be noted that the mesoporous composite CZA-aerogel catalyst exhibits a much higher amount of surface hydroxyl groups than its xerogel counterpart.…”

Section: Ftir Of Bifunctional Calcined Catalystsmentioning

confidence: 74%

“…Figure 5A,B display the FTIR spectra of the dried and calcined aerogel and xerogel sulfated zirconia. All the spectra showed broad bands with the maximum centered at 3365 cm −1 , which is attributed to the vibration bands of the hydroxyl group of the physisorbed water and hydroxides [42,43]. There are three types of surface hydroxyl groups on the surface of ZrO 2 : terminal, tri-bridged, and surface-bound hydroxyl groups [44].…”

Section: Ftir Studymentioning

confidence: 98%

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Improved Dimethyl Ether Production from Syngas over Aerogel Sulfated Zirconia and Cu-ZnO(Al) Bifunctional Composite Catalysts

Lassoued,

Mota,

Millán Ordóñez

et al. 2023

Materials

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This work is dedicated to the study of the effect of the synthesis conditions (drying and calcination) of sulfated zirconia on the final catalytic behavior of bifunctional composite catalysts prepared by the physical mixing of the sulfated zirconia (methanol dehydration catalyst) with Cu/ZnO/Al2O3 (CZA; methanol synthesis catalyst). The main objective was to optimize the CZA-ZrO2/SO42− composite catalyst for its use in the direct production of dimethyl ether (DME) from syngas. Sulfated zirconia aerogel (AZS) and xerogel (XZS) were prepared using the sol–gel method using different solvent evacuation conditions and calcination temperatures, while the Cu-ZnO(Al) catalyst was synthesized using the coprecipitation procedure. The effectivity of CZA-ZrO2/SO42− composite catalysts for the direct production of dimethyl ether (DME) from syngas was evaluated in a flow reactor at 250 °C and 30 bar total pressure. The characterization of the sulfated zirconia aerogels and xerogels using different techniques showed that the mesoporous aerogel (AZS0.5300) exhibited the best textural and acidic properties due to the gel drying under supercritical conditions and calcination at 300 °C. As a result, the composite catalyst CZA-AZS0.5300 exhibited seven times higher DME production than its xerogel-containing counterpart (364 vs. 52 μmolDME·min−1·gcat−1). This was attributed to its well-matched metal surface, mesoporous structure, optimal crystallite size and, most importantly, its higher acidity.

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Section: Ftir Of Bifunctional Calcined Catalystsmentioning

confidence: 74%