The influence of sulfate contents on the surface properties of sulfate-modified tin(IV) oxide catalysts

Khalaf, Hussein; Mansour, Saber E.; El-Madani, Enas A.

doi:10.1016/j.jaubas.2011.06.003

Cited by 5 publications

(8 citation statements)

References 22 publications

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“…An alternate technique is potentiometric titration using a pH-sensitive electrode. An electrode potential scale was proposed to qualitatively discriminate the strength of acid sites: >100 mV-very strong, 0-100 mV-strong, −100-0 mV-weak, and <−100 mV-very weak acid sites [151]. The informative method to identify the acid/base sites is infrared spectroscopy.…”

Section: Conflicts Of Interestmentioning

confidence: 99%

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Marikutsa

Rumyantseva

Константинова

et al. 2021

Sensors

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Development of sensor materials based on metal oxide semiconductors (MOS) for selective gas sensors is challenging for the tasks of air quality monitoring, early fire detection, gas leaks search, breath analysis, etc. An extensive range of sensor materials has been elaborated, but no consistent guidelines can be found for choosing a material composition targeting the selective detection of specific gases. Fundamental relations between material composition and sensing behavior have not been unambiguously established. In the present review, we summarize our recent works on the research of active sites and gas sensing behavior of n-type semiconductor metal oxides with different composition (simple oxides ZnO, In2O3, SnO2, WO3; mixed-metal oxides BaSnO3, Bi2WO6), and functionalized by catalytic noble metals (Ru, Pd, Au). The materials were variously characterized. The composition, metal-oxygen bonding, microstructure, active sites, sensing behavior, and interaction routes with gases (CO, NH3, SO2, VOC, NO2) were examined. The key role of active sites in determining the selectivity of sensor materials is substantiated. It was shown that the metal-oxygen bond energy of the MOS correlates with the surface acidity and the concentration of surface oxygen species and oxygen vacancies, which control the adsorption and redox conversion of analyte gas molecules. The effects of cations in mixed-metal oxides on the sensitivity and selectivity of BaSnO3 and Bi2WO6 to SO2 and VOCs, respectively, are rationalized. The determining role of catalytic noble metals in oxidation of reducing analyte gases and the impact of acid sites of MOS to gas adsorption are demonstrated.

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Section: Conflicts Of Interestmentioning

confidence: 99%

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Marikutsa

Rumyantseva

Константинова

et al. 2021

Sensors

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“…The absorption broad band centered at 627 cm –1 indicates O–Sn–O stretching, and the band at 3430 cm –1 is due to the presence of hydroxyl groups on the surface of the samples. The bands at 1209 cm –1 1151, and 1010 of sulfated-SnO 2 are due to the asymmetric and symmetric stretching frequencies of sulfate ions. , Figure illustrates the Raman spectra of SnO 2 and sulfated-SnO 2 molecules. Raman shifts obtained at 634 cm –1 , 704, and 478 cm –1 correspond to rotational and vibrational modes of O–Sn–O molecules.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The bands at 1209 cm −1 1151, and 1010 of sulfated-SnO 2 are due to the asymmetric and symmetric stretching frequencies of sulfate ions. 19,20 Figure 2 illustrates the Raman spectra of SnO 2 and sulfated-SnO 2 molecules. Raman shifts obtained at 634 cm −1 , 704, and 478 cm −1 correspond to rotational and vibrational modes of O−Sn−O molecules.…”

Section: Resultsmentioning

confidence: 99%

“…Pellets were made from this powder using 6 mm dye under 10 ton of pressure. Further, IR analysis was carried out between frequency range 4000–400 cm –1 using a PerkinElmer spectrophotometer with 8 cm –1 resolution. , A Renishaw Raman InVia microscope (spectra-physics model 163) was used to obtain the Raman spectra of the samples. An argon ion laser beam with the wavelength 514 nm, spot size of 1–2 μm, and 3.6 mW power was used.…”

Section: Experimental Sectionmentioning

confidence: 99%

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Synthesis of Epoxidized Canola Oil Using a Sulfated-SnO₂ Catalyst

Somidi

Sharma

Dalai

2014

Ind. Eng. Chem. Res.

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In the present investigation, a heterogeneous sulfated-SnO2 catalyst was synthesized and used for the epoxidation of unsaturation present in the canola oil. The physicochemical properties were studied to measure the surface and bulk properties of prepared SnO2 and sulfated-SnO2 samples. Process optimization studies were performed for parameters such as catalyst loading, ethylenic unsaturation in canola oil to hydrogen peroxide molar ratio, ethylenic unsaturation in canola oil to acetic acid molar ratio, and temperature. Sulfated-SnO2 demonstrated promising catalytic activity with 100% conversion of unsaturation in canola oil to epoxy canola oil in 6 h at optimum process conditions. Based on the experimental results and kinetic data, a Langmuir–Hinshelwood-Hougen-Watson type mechanism was proposed, and the reaction followed pseudo first order. Calculated energy of activation was 17.75 kcal/mol. The tribological properties of epoxy canola oil such as lubricity property in terms of wear scar length, kinematic viscosities, viscosity index, oxidative induction time, cloud point, and pour point were measured.

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“…According to studies carried out by Jayamurugan et al (2011), polyaniline is easily doped in an acidic medium. The acid groups in the polyaniline and the sulfonated copolymer could facilitate the adsorption of the tin chloride particles in an aqueous medium before the formation of the tin IV oxide 41 . The acidic surfaces act as catalysts once the formation of oxide in the absence of polymer occurs, having a very low conversion at the same time and under the same pH aqueous solution conditions.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of polyaniline protonation onPLGApolycondensation viaSty‐DVB/Pani catalyst

Gomes

Moura

Chaves

et al. 2023

Polymer Engineering & Sci

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This study presents a method to polymerize aniline in styrene‐divinylbenzene copolymer pores using benzoyl peroxide as an initiator. The composites are sulfonated, impregnated with tin oxide (IV) and used as heterogeneous catalysts in the direct polycondensation synthesis of PLGA. Evaluation of parameters such as molar proportion, temperature, time, quantity and type of catalyst were carried out. The characterization of composites and PLGA's were performed by: elemental analysis, DRX, FTIR, nitrogen adsorption–desorption, Brønsted acid site determination, SEM, ICP/OES, and inherent viscosity. The polyaniline deprotonation before thermal treatment enhances crosslinking, increasing surface area and stability of the porous structure. The composite acts as a catalyst, increasing PLGA molar mass, reducing oxidation and tin contamination. The process has several advantages like PLGA production without solvent contamination, lower tin content, and no high‐cost cyclic dimmers use. So far, the results show promising catalytic performance of the developed composite.

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The influence of sulfate contents on the surface properties of sulfate-modified tin(IV) oxide catalysts

Cited by 5 publications

References 22 publications

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Synthesis of Epoxidized Canola Oil Using a Sulfated-SnO₂ Catalyst

Evaluation of polyaniline protonation onPLGApolycondensation viaSty‐DVB/Pani catalyst

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The influence of sulfate contents on the surface properties of sulfate-modified tin(IV) oxide catalysts

Cited by 5 publications

References 22 publications

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Synthesis of Epoxidized Canola Oil Using a Sulfated-SnO2 Catalyst

Evaluation of polyaniline protonation onPLGApolycondensation viaSty‐DVB/Pani catalyst

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Synthesis of Epoxidized Canola Oil Using a Sulfated-SnO₂ Catalyst