Synthesis, characterization and properties of Ce-modified S2O82−/ZnAl2O4 solid acid catalysts

Wang, Junxia; Wang, Anqi; Ye, Xing; Zhu, Zi‐Zhong; Wu, Xia; Yang, Lixia

doi:10.1039/c5ra21409b

Cited by 5 publications

(3 citation statements)

References 48 publications

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“…Band intensity at 3614, 3580, 3552 and 1636 cm −1 of AMDC decreases or disappears, verifying the losses of bound water and zeolitic water during the calcination process. Furthermore, new bands for AMDC are observed at 1175 and 1085 cm −1 , indicating that S 2 O 8 2− was successfully loaded onto ATP . Figure (b) presents the XRD patterns of ATP and AMDC.…”

Section: Resultsmentioning

confidence: 95%

“…Furthermore, new bands for AMDC are observed at 1175 and 1085 cm −1 , indicating that S 2 O 8 2− was successfully loaded onto ATP. 24 Figure 2(b) presents the XRD patterns of ATP and AMDC. From curve ATP, we know that the diffraction peak appears at 2 around 20.0 ∘ , 21.1 ∘ and 27.8 ∘ which is the characteristic diffraction peak of (040), (121) and (311) crystal planes of ATP.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

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Attapulgite‐supported magnetic dual acid–base catalyst for the catalytic conversion of lignin to phenolic monomers

Zhang

Zhao

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Research on the catalytic conversion of lignin into value‐added chemicals has grown rapidly on account of the importance of lignin in the biorefinery. There is thus a need to investigate novel technologies to depolymerize lignin in the absence of hydrogen gas and noble metal catalysts. This study developed a cheap and recyclable catalyst via a facile process involving impregnation and calcination for the conversion of lignin to value‐added phenolic monomers. RESULTS Acid sites, basic sites and magnetic components were successfully incorporated into attapulgite. The resulting catalyst displayed high catalytic activity for lignin conversion to phenolic monomers, which resulted in 10.9% total monomers yield at 250 °C for 3 h with a catalyst loading of 50% and a solvent–solid ratio of 20:1 in 50% C2H5OH. The total monomers yield decreased observably after eight successive reaction runs. After being calcined at 600 °C for 3 h, the recovered catalyst provided a total monomers yield of 6.74% in the ninth reaction run. CONCLUSION A novel catalyst was successfully prepared by incorporation of acid sites, basic sites and magnetic properties using natural attapulgite clay as a precursor via a simple and inexpensive process. The resulting catalyst could depolymerize lignin efficaciously. The reusability of the catalyst was barely satisfactory, however, the activity could be partly recovered by simple calcination. © 2018 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 95%

Section: Catalysts Characterizationmentioning

confidence: 99%

Attapulgite‐supported magnetic dual acid–base catalyst for the catalytic conversion of lignin to phenolic monomers

Zhang

Zhao

et al. 2019

J of Chemical Tech & Biotech

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“…In the higher ratio, the conversion decreased slightly to 76% due to the dilution effect of n‐butanol(Figure 7b). [ 41,42 ]…”

Section: Resultsmentioning

confidence: 99%

A new Brønsted acid MIL‐101(Cr) catalyst by tandem post‐functionalization; synthesis and its catalytic application

Mortazavi

Abbasi

Masteri‐Farahani

2020

Applied Organom Chemis

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A new heterogeneous Brønsted solid acid catalyst was prepared by tandem post-functionalization of MIL-101(Cr) and utilized for acetic acid esterification and alcoholysis of epoxides under solvent-free conditions. First, MIL-101 (Cr) was functionalized with pyrazine to achieve MIL-101(Cr)-Pyz. Afterwards, the nucleophilic reaction of MIL-101(Cr)-Pyz with 1,3-propane sultone and next acidification with diluted sulfuric acid gave MIL-101(Cr)-Pyz-RSO 3 H Brønsted solid acid catalyst. Various characterization methods such as Fourier transformation infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), elemental analysis (CHNS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersiveX-ray(EDX) spectroscopy, thermal analysis (TGA/DTA), acid-base titration, and N 2 adsorption/desorption analysis were employed to fully characterize the prepared catalyst. The catalyst showed high activity compared to unmodified MIL-101(Cr) in both catalytic acetic acid esterification and alcoholysis of epoxides. It can also be readily isolated from the reaction mixture and reused three times without major decrease in its activity.

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Development of palygorskite-SO42−/ZnAl2O4 composites as a novel solid acid catalyst for the esterification of acetic acid with n-butanol

Wang

Tian

et al. 2017

Applied Clay Science

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Synthesis, characterization and properties of Ce-modified S₂O₈²⁻/ZnAl₂O₄ solid acid catalysts

Abstract: A new S2O82−/ZnAl2O4-4 wt% Ce solid acid catalyst with stable spinel structure performed the high activity and well reusability in esterification of acetic acid and n-butanol.

Cited by 5 publications

References 48 publications

Attapulgite‐supported magnetic dual acid–base catalyst for the catalytic conversion of lignin to phenolic monomers

Attapulgite‐supported magnetic dual acid–base catalyst for the catalytic conversion of lignin to phenolic monomers

A new Brønsted acid MIL‐101(Cr) catalyst by tandem post‐functionalization; synthesis and its catalytic application

Development of palygorskite-SO42−/ZnAl2O4 composites as a novel solid acid catalyst for the esterification of acetic acid with n-butanol

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