Characterization of SO4
            2−/TiO2 and its catalytic activity in the epoxidation reaction

He, Jie; Li, Ruilan; Ma, Xiaoqin

doi:10.1007/s11164-017-2882-y

Cited by 18 publications

(13 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, excessive methanol results in the JO conversion decrease, which may be due to the decline of the contact probability between catalyst and reactants. This is also in good agreement with the literature reported earlier [46]. Clearly, the selectivity to biodiesel (greater than 98.8%) and FAMEs composition is almost unchanged with the rising of n CH 3 OH : n JO .…”

Section: Effects Of N Ch 3 Oh : N Josupporting

confidence: 93%

“…In addition, the results of the specific surface area and pore volume calculated with the BET and BJH method, 4 /TiO 2 samples exhibit much larger surface area and mesopore volume than TiO 2 sample, and the surface area increases with the impregnation sulfuric acid content, which is in agreement with the results obtained in the previous reference [45]. This may be because the TiO 2 particles are partially dissolved by H 2 SO 4 , which would reduce the particle size and lead to the increase in BET area [46]. Similarly, the mesopore volume, which is the hole between the crystal particles, will increase when the catalyst particle size decreases in these xSO 2À 4 /TiO 2 samples, in good agreement with the results obtained by nitrogen sorption (figure 3).…”

Section: Transesterification Of Josupporting

confidence: 89%

See 1 more Smart Citation

Heterogeneous and efficient transesterification of Jatropha curcas L. seed oil to produce biodiesel catalysed by nano-sized SO ₄ ²⁻ /TiO ₂

et al. 2018

View full text Add to dashboard Cite

Developing high-efficiency hetero-catalysts for transesterification reaction is of great importance in the production of biodiesel from Jatropha curcas L. seed oil (JO). Here, we synthesized a series of sulfated TiO2 by treating with varying H2SO4 concentration (SO42−/TiO2) and TiO2 catalysts and applied to the transesterification of JO. Furthermore, these heterostructures were characterized by many characterization methods including XRD, FT-IR, N2-adsorption, SEM, TEM, TG, py-IR and NH3-TPD, and their catalytic performance was investigated under various operating conditions. The results reveal that both the Brønsted and Lewis acid sites are presented in the SO42−/TiO2 catalysts, while only Lewis-type sites are observed in the TiO2 catalyst. And the acid intensity, surface area and mesoporous volume of catalysts are improved obviously after treating TiO2 with sulfuric acid. Then the SO42−/TiO2 catalysts exhibit much higher catalytic activity than TiO2 catalyst, which is attributed to the larger surface area and mesoporous volume and stronger acidity. Furthermore, the reusability behaviour of 1.5 SO42−/TiO2 catalyst in the transesterification of JO was also studied.

show abstract

Section: Effects Of N Ch 3 Oh : N Josupporting

confidence: 93%

Section: Transesterification Of Josupporting

confidence: 89%

Heterogeneous and efficient transesterification of Jatropha curcas L. seed oil to produce biodiesel catalysed by nano-sized SO ₄ ²⁻ /TiO ₂

et al. 2018

View full text Add to dashboard Cite

show abstract

“…prepared SO 4 2− /TiO 2 by precipitation impregnation using TiO 2 as a precursor and sulfuric acid as a sulfonating agent. When the concentration of sulfuric acid impregnation increased from 0.1 to 1 mol L −1 , the BET specific surface area of SO 4 2− /TiO 2 increased from 156 to 206 m 2 g −1 54 …”

Section: Resultsmentioning

confidence: 99%

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

Zhang

2020

J of Chemical Tech & Biotech

Self Cite

View full text Add to dashboard Cite

BACKGROUND: The zirconium-containing metal-organic framework (MOF) UiO-66 was used as a cell to synthesize SO 4 2 − /ZrO 2 @Al 2 O 3 , a high-density superacid with relatively strong Brønsted acidity. The UiO-66 MOF was first coated with alumina to form ZrO 2 @Al 2 O 3. Impregnation with ammonium sulfate and calcination at 500°C afforded the bimetallic composite solid superacid SO 4 2− /ZrO 2 @Al 2 O 3. RESULTS: Scanning and transmission electron microscopy images confirmed that UiO-66 was successfully coated with aluminium oxide, and its octahedral structure and uniform size (400-600 nm) were retained. SO 4 2− /ZrO 2 @Al 2 O 3 had a Brunauer-Emmett-Teller specific surface area of 301-330 m 2 g −1 and average pore diameter of 9.6-10.7 nm. X-ray photoelectron spectroscopy and Fourier transform infrared analysis showed that SO 4 2− /ZrO 2 @Al 2 O 3 contained S 6+ and Al 3+. Temperatureprogrammed ammonia desorption analysis showed that SO 4 2− /ZrO 2 @Al 2 O 3 contained super-strong acid sites. The total volume of desorbed ammonia reached 90-109 cm 3 g −1. Infrared spectra of adsorbed pyridine indicated that SO 4 2− /ZrO 2 @Al 2 O 3 contained mainly Lewis acid sites and was relatively rich in Brønsted acid sites. Thermogravimetric analysis showed that the thermal stability of SO 4 2− /ZrO 2 @Al 2 O 3 was high. CONCLUSIONS: SO 4 2− /ZrO 2 @Al 2 O 3-3M (the impregnation concentration of ammonium sulfate was 3 mol L −1) and glucose were used to synthesize ethyl levulinate (EL) in ethanol. The highest EL yield of 37.5 mol% was obtained after reacting the mixture at 200°C for 5 h. An EL yield of 28.8 mol% was obtained after four consecutive reuses of the SO 4 2− /ZrO 2 @Al 2 O 3-3M catalyst.

show abstract

“…In the temperature stage of 500°C to 600°C, a rapid weight loss and a change of sulfur content indicates the loss of crystal water and the loss of sulfur. The fastest weight loss at 568°C from the DTG curve indicates the decomposition of catalyst when the calcination temperature is above 568°C …”

Section: Resultsmentioning

confidence: 99%

Catalytic solvent regeneration of a CO₂‐loaded MEA solution using an acidic catalyst from industrial rough metatitanic acid

Liu

et al. 2018

Greenhouse Gases

View full text Add to dashboard Cite

Ethanolamine (MEA) solution is the most commonly used commercial chemical absorbent in conventional CO 2 postcombustion processes; however the high heat duty and reaction temperature (e.g. 125°C) for solvent regeneration leads to high energy requirements (approximately 70-80% of the total running cost). This paper reports a catalytic solvent regeneration of a CO 2 -loaded MEA solution using industrial calcined rough metatitanic acid (TiO(OH) 2 ) as the catalyst to improve the CO 2 desorption rate and reduce the regeneration temperature to 95°C. The catalytic reaction parameters were systematically investigated with an improvement in the CO 2 desorption rate of 28.9% in comparison with the non-catalytic process. The results of characterization, such as the thermogravimetry analysis, X-ray diffraction, N 2 adsorption-desorption, pyridine-infrared spectroscopy (Py-IR), showed that the Lewis acid of the industrial metatitanic acid played a major role in the decomposition of carbamate and in enhancing the regeneration rate of MEA solvent in a CO 2 -rich MEA solution. C

show abstract

Characterization of SO4 2−/TiO2 and its catalytic activity in the epoxidation reaction

Cited by 18 publications

References 24 publications

Heterogeneous and efficient transesterification of Jatropha curcas L. seed oil to produce biodiesel catalysed by nano-sized SO ₄ ²⁻ /TiO ₂

Heterogeneous and efficient transesterification of Jatropha curcas L. seed oil to produce biodiesel catalysed by nano-sized SO ₄ ²⁻ /TiO ₂

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

Catalytic solvent regeneration of a CO₂‐loaded MEA solution using an acidic catalyst from industrial rough metatitanic acid

Contact Info

Product

Resources

About

Characterization of SO4 2−/TiO2 and its catalytic activity in the epoxidation reaction

Cited by 18 publications

References 24 publications

Heterogeneous and efficient transesterification of Jatropha curcas L. seed oil to produce biodiesel catalysed by nano-sized SO 4 2− /TiO 2

Heterogeneous and efficient transesterification of Jatropha curcas L. seed oil to produce biodiesel catalysed by nano-sized SO 4 2− /TiO 2

An alumina‐coated UiO‐66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis

Catalytic solvent regeneration of a CO2‐loaded MEA solution using an acidic catalyst from industrial rough metatitanic acid

Contact Info

Product

Resources

About

Heterogeneous and efficient transesterification of Jatropha curcas L. seed oil to produce biodiesel catalysed by nano-sized SO ₄ ²⁻ /TiO ₂

Heterogeneous and efficient transesterification of Jatropha curcas L. seed oil to produce biodiesel catalysed by nano-sized SO ₄ ²⁻ /TiO ₂

Catalytic solvent regeneration of a CO₂‐loaded MEA solution using an acidic catalyst from industrial rough metatitanic acid