Platinum-sulfated-zirconia. Infrared study of adsorbed pyridine

Zhang, Chunjie; Miranda, R.; Davis, Burtron H.

doi:10.1007/bf00807114

Cited by 34 publications

(11 citation statements)

References 26 publications

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“…Note that prior to pyridine adsorption, the catalysts were pretreated at 450°C for 2 h under a vacuum of 10 -2 Pa in the present study, while the much lower pretreatment temperature (200°C) was employed in the literature [27]. For sulfated zirconia catalyst, the reversible transformation between Brønsted and Lewis acidity upon dehydration/hydration was found, and higher pretreatment temperature favors the formation of Lewis acid sites [28,29]. Hence, the discrepancy between our study and the literature should stem from different pretreatment temperature employed for the samples before adsorption of pyridine.…”

Section: Catalyst Characterizationmentioning

confidence: 97%

Characterization and Catalytic Activities of Al2O3-Promoted Sulfated Tin Oxides

et al. 2009

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A series of Al 2 O 3 -doped (0.5-3 mol%) sulfated tin oxides have been prepared by a co-precipitation method, followed by sulfation and calcination. Textural and structural characterizations of these samples were performed by means of XRD, N 2 adsorption, XPS, DTG, Raman spectroscopy, diffuse reflectance UV-vis spectroscopy and 27 Al MAS NMR. FT-IR spectra of adsorbed pyridine were used to determine the acid properties. The addition of small amounts of Al 2 O 3 (0.2-1.5 mol%) to sulfated tin oxide brings about a dramatic improvement of catalytic activity from 36.1 to 52.4-58.0% for acylation of 2-methoxynaphthalene with acetic anhydride.

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Section: Catalyst Characterizationmentioning

confidence: 97%

Characterization and Catalytic Activities of Al2O3-Promoted Sulfated Tin Oxides

et al. 2009

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“…ZD after thermal treatment at 893 K for 6 h, crushing and sieving to 100 µm was stored as ZC. The ZC dispersed in 5.0 N aqueous sulfuric acid solution in the ratio 8 mL/g of zirconia by dropwise addition [31,32] was kept under stirring condition for 1 h at room temperature. Suspension was then filtered and dried at 383 K for 24 h, calcined at 893 K for 6 h, sieved to 100 µm and stored for further use as SZC [28].…”

Section: Preparation Of Zirconia Catalystsmentioning

confidence: 99%

“…Liquid ammonia was added drop wise in zirconium oxychloride octahydrate solutions with constant stirring and along with few drops of ammonium carbonate solution [27,28] to obtain a precipitate which was further refluxed for 6 h and aged for 12 h. The bottom slurry was filtrated, and the filtrate was washed with NH 4 OH solution and hot double distilled water to completely remove chloride ions [28][29][30][31]. After drying at 383 K for 24 h, slight crushing and sieving to 100 µm, the crushed chloride-free hydrous zirconia was stored as ZD in a desiccator.…”

Section: Preparation Of Zirconia Catalystsmentioning

confidence: 99%

Oxidative Desulfurization of Dibenzothiophene by Zirconia-Based Catalysts

Kumar

Srivastava

Badoni

2014

International Journal of Chemical Reactor Engineering

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The objective of this study is to report usage of laboratory-prepared zirconia-based samples, normal zirconia (ZD), calcined zirconia at 893 K (ZC) and sulfated and calcined zirconia at 893 K (SZC), as potential catalysts for the oxidative removal of sulfur from model oil (dibenzothiophene in iso-octane). Optimum catalyst doses for all catalysts were found to be 1.0 g/L. The catalytic oxidation of DBT on zirconia samples was found to be a gradual process, and quasi-equilibrium reached in 6 h. Kinetic and thermodynamic parameters have also been calculated.

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“…The superiority of this catalyst is its high activity at relatively low temperatures [23]. SO 4 2-/ZrO 2 has a catalytic activity that can convert hydrocarbons at low temperatures [24]. The lack of SO 4 2-/ZrO 2 catalysts are the limited surface area that affects the acidity, so some modifications are developed to increase the acidity of the catalyst.…”

Section: ■ Introductionmentioning

confidence: 99%

Synthesis of SO42–/ZrO2 Solid Acid and Na2O/ZrO2 Solid Base Catalysts Using Hydrothermal Method for Biodiesel Production from Low-Grade Crude Palm Oil

et al. 2022

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Biodiesel is a renewable energy source that can be produced through esterification as well as transesterification reactions. This work presents a series of zirconia catalysts synthesized by hydrothermal method on various concentrations in acidic (H2SO4 0.3, 0.5, and 0.7 M) and basic (NaOH 1, 2, 3, and 4 M) solution to get a catalyst with the highest acidity or basicity. Characterizations of the catalysts were performed by FTIR, XRD, SEM-EDX, surface area analysis, acidity, and basicity test. The most active acid catalyst activity was evaluated for the esterification of low-grade crude palm oil (LGCPO), while the solid base catalyst was utilized for the transesterification reaction. The solid acid catalyst of 0.7 M SO42–/ZrO2 60 °C; 24 h was denoted as the most active acid catalyst with a total acidity of 1.86 mmol g–1, while 4 M Na2O/ZrO2 60 °C; 24 h catalyst was considered as the solid base catalyst with the highest total basicity of 3.75 ± 0.12 mmol g–1. The optimized acid catalyst exhibited a 31 times higher acidity than commercial ZrO2. The concentration of free fatty acids (FFA) decreased to 68.87% in the esterification reaction. The solid base catalyst of 4 M Na2O/ZrO2 60 °C; 24 h successfully converted LGCPO into biodiesel by 68.55% through a transesterification reaction.

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Platinum-sulfated-zirconia. Infrared study of adsorbed pyridine

Cited by 34 publications

References 26 publications

Characterization and Catalytic Activities of Al2O3-Promoted Sulfated Tin Oxides

Characterization and Catalytic Activities of Al2O3-Promoted Sulfated Tin Oxides

Oxidative Desulfurization of Dibenzothiophene by Zirconia-Based Catalysts

Synthesis of SO<sub>4</sub><sup>2–</sup>/ZrO<sub>2</sub> Solid Acid and Na<sub>2</sub>O/ZrO<sub>2</sub> Solid Base Catalysts Using Hydrothermal Method for Biodiesel Production from Low-Grade Crude Palm Oil

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