Novel mesoporous TiO2(B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances

Li, Licheng; Yue, Haiqin; Ji, Tuo; Li, Wei; Zhao, Xuejuan; Wang, Lei; She, Jie; Gu, Xiaoli; Li, Xiaobao

doi:10.1016/j.apcata.2019.01.025

Cited by 34 publications

(22 citation statements)

References 66 publications

(95 reference statements)

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“…The N 2 adsorption–desorption isotherms of T‐ZrO 2 and M‐ZrO 2 samples exhibited type IV, and the hysteresis loops of different catalysts are different (shown in Figure S2, Supporting Information). The hysteresis loop of T‐ZrO 2 was H2 type, whereas that of M‐ZrO 2 was H3 type, indicating that zirconia carrier was mesoporous in nature . The pore semidiameters of T‐ZrO 2 mainly concentrated at the vicinity of 5 nm, whereas that in M‐ZrO 2 dispersed in a wider range.…”

Section: Resultsmentioning

confidence: 96%

“…The NH 3 ‐TPD pattern of the 500‐T‐1.5 catalyst exhibits two desorption peaks centering from 300 to 700 °C, respectively. Generally, the peaks in the range of 120–300 °C are related to weak acidic sites, the peaks generated at 300–500 °C are related to moderate acidic sites, and the peaks above 500 °C are related to strong acidic sites . The 500‐T‐1.5 catalyst possessed moderate‐to‐strong acidic sites (Table ).…”

Section: Resultsmentioning

confidence: 98%

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Sulfated Zirconia with Different Crystal Phases for the Production of Ethyl Levulinate and 5‐Hydroxymethylfurfural

Shao

Sun

et al. 2019

Energy Tech

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Distinct crystal phases of an oxide affect the configuration of surface atoms, which might further affect coordination with sulfate during sulfonation for the preparation of SO42−/MxOy type of acid catalyst. Herein, such an effect is investigated with zirconia of the tetragonal or monoclinic phase as the model catalysts. The results show that sulfonation inhibits the transformation of zirconia from the tetragonal phase to the monoclinic phase, whereas the varied phase of zirconia also affects the bonding patterns of sulfate species with zirconia in sulfonation. The sulfated zirconia of monoclinic phase contains more abundant acidic sites and more Brønsted acid sites than that of sulfated zirconia of tetragonal phase. Consequently, the sulfated zirconia of monoclinic phase is more active than the sulfated zirconia of tetragonal phase for the conversion of furfuryl alcohol in ethanol and conversion of fructose in dimethyl sulfoxide, achieving the yield of ethyl levulinate of 96.4% and a high yield of 5‐hydroxymethylfurfural. The sulfated zirconia is not stable in protic solvent due to the leaching of sulfur species and the change in configurations of the sulfate species and the zirconium species, but in the aprotic solvent, they show good stability and recyclability.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 98%

Sulfated Zirconia with Different Crystal Phases for the Production of Ethyl Levulinate and 5‐Hydroxymethylfurfural

Shao

Sun

et al. 2019

Energy Tech

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“…As seen in Fig. , the peaks ranging from 120 to 300 °C were assigned to weak acidic sites, the peaks in the range from 300 to 500 °C were related to moderate acidic sites and the peaks above 500 °C were attributed to strong acidic sites . The sulfated TiO 2 catalysts possessed more acidic sites than the non‐sulfated TiO 2 , confirming that the grafting of sulfur species on the surface of TiO 2 was successfully achieved.…”

Section: Resultsmentioning

confidence: 97%

Sulfated TiO₂ nanosheets catalyzing conversion of biomass derivatives: influences of the sulfation on distribution of Brønsted and Lewis acidic sites

Shao

Gao

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The synthesis of solid acid catalysts of recoverable and environmentally friendly nature has gained increasing attention in recent years. The distribution of Brønsted and Lewis acidic sites on the surface of sulfated metal oxides determines the catalytic performance, which is affected by many key factors, such as the concentration of sulfuric acid impregnated and the morphology of the metal oxides used. In this study, TiO2 nanosheets were successfully synthesized and used as carrier for the preparation of solid acid catalysts. RESULTS The concentration of sulfuric acid for the impregnation resulted in various distributions of Brønsted and Lewis acidic sites on the surface of sulfated TiO2. With a medium concentration of sulfuric acid (1 mol L−1) for the impregnation, the highest ratio of Brønsted to Lewis acidic sites can be achieved, and the catalyst showed superior catalytic activity for the conversion of furfuryl alcohol (FA) to ethyl levulinate (EL) in ethanol and the conversion of fructose to 5‐hydroxymethylfurfural (HMF) in dimethyl sulfoxide (DMSO). CONCLUSION The sulfation of TiO2 nanosheets induced the formation of both Brønsted and Lewis acidic sites. The Brønsted acidic sites were more effective for catalyzing the conversion of FA or fructose. The poor recyclability of the 1.0‐SO42−/TiO2 catalyst in the conversion of FA to EL in ethanol, a protic solvent, was due to the leaching of sulfur species. The deactivation of the catalyst in DMSO was due to coking, which could be resolved via calcination of the coke species in air. © 2019 Society of Chemical Industry

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“…[35][36][37] According to studies by Li and Liu et al, anatase TiO 2 can only provide L acidic sites. 38,39 Compared with other samples containing TiO 2 , the peak area of TiO 2 is smaller and the wave number is slightly higher. It can be considered that the peak of VO X /TiO 2 is a result of superposition of VO X and TiO 2 peaks.…”

Section: Nh 3 -Tpd and Py-ir Analysismentioning

confidence: 93%

VO_X supported on TiO₂–Ce_0.9Zr_0.1O₂ core–shell structure catalyst for NH₃-SCR of NO

et al. 2019

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Novel mesoporous TiO2(B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances

Abstract: Novel mesoporous TiO 2 (B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances, Applied Catalysis A, General (2019),

Cited by 34 publications

References 66 publications

Sulfated Zirconia with Different Crystal Phases for the Production of Ethyl Levulinate and 5‐Hydroxymethylfurfural

Sulfated Zirconia with Different Crystal Phases for the Production of Ethyl Levulinate and 5‐Hydroxymethylfurfural

Sulfated TiO₂ nanosheets catalyzing conversion of biomass derivatives: influences of the sulfation on distribution of Brønsted and Lewis acidic sites

VO_X supported on TiO₂–Ce_0.9Zr_0.1O₂ core–shell structure catalyst for NH₃-SCR of NO

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Novel mesoporous TiO2(B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances

Abstract: Novel mesoporous TiO 2 (B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances, Applied Catalysis A, General (2019),

Cited by 34 publications

References 66 publications

Sulfated Zirconia with Different Crystal Phases for the Production of Ethyl Levulinate and 5‐Hydroxymethylfurfural

Sulfated Zirconia with Different Crystal Phases for the Production of Ethyl Levulinate and 5‐Hydroxymethylfurfural

Sulfated TiO2 nanosheets catalyzing conversion of biomass derivatives: influences of the sulfation on distribution of Brønsted and Lewis acidic sites

VOX supported on TiO2–Ce0.9Zr0.1O2 core–shell structure catalyst for NH3-SCR of NO

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Sulfated TiO₂ nanosheets catalyzing conversion of biomass derivatives: influences of the sulfation on distribution of Brønsted and Lewis acidic sites

VO_X supported on TiO₂–Ce_0.9Zr_0.1O₂ core–shell structure catalyst for NH₃-SCR of NO