Clay Science

Bergaya, F.; Beneke, K.; Berry, Richard W.; Lagaly, G.; Tankersley, Kenneth B.

doi:10.1016/b978-0-08-098258-8.00028-6

Cited by 137 publications

(1 citation statement)

References 61 publications

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“…The Vrm layer is composed of one Mg-O 4 (OH) 2 octahedral sheet sandwiched between two opposing silicon-oxygen tetrahedral sheets. The layer charge mainly arises from the substitution of Al 3+ for Si 4+ in tetrahedral sheet [14,22], which makes the higher layer charge density (0.6-0.9 eq./formula unit) than Mt (0.2-0.6 eq./formula unit) [14,23]. This unique structure characteristics signi cantly in uences several physicochemical properties of clay minerals, such as higher cation exchange capacity, better thermal stability and thermal expansion [19,24].…”

Section: Introductionmentioning

confidence: 99%

Acid leaching vermiculite: A multi-functional solid catalyst with strongly electrostatic field and Brönsted acid for depolymerization of cellulose in water

Chen

Tong

Fang

et al. 2022

Preprint

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Vermiculite is a natural, environmentally friendly mineral, which is widely used in construction, thermal insulation, metallurgy, and agriculture. In this study, vermiculite and acid-activated vermiculite was used as a solid acid catalyst for the hydrolysis of cellulose in water. The vermiculite based solids were characterized by XRD, FT-IR, and BET. The effects of reaction time, reaction temperature, mass ratio and water amount on the reaction were also investigated in the batch reactor. The results showed that the highest total reducing sugars (TRS) yield of 40.1% could be obtained on the vermiculite activated by 35(wt)% H2SO4 with the mass ratio of catalyst to cellulose of 0.18 and water to cellulose of 16 at 478 K for 3.5 h. The acid-activated vermiculite was also a stable catalyst through calcination at 628 K and the yield of TRS decreased from 40.1% to 36.2% after three times reuse. The results showed that the crystal structure of vermiculite was almost destroyed and the surface -OH groups increased after the acid treatment. However, the synergistic effect of strongly electrostatic polarization and Brönsted acid was responsible for the efficient conversion of cellulose. Finally, the mechanism of cellulose hydrolysis on the acid-activated vermiculite was suggested. This work provides a promising strategy to design an efficient solid catalyst for the cellulose hydrolysis, and also expands the use of vermiculite in a new field.

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Section: Introductionmentioning

confidence: 99%

Acid leaching vermiculite: A multi-functional solid catalyst with strongly electrostatic field and Brönsted acid for depolymerization of cellulose in water

Chen

Tong

Fang

et al. 2022

Preprint

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Oscillatory Briggs‐Rauscher Reaction as “Fingerprint” for Bentonite Identification: The Fine‐Tuning of Oscillatory Dynamics with Addition of Clay

et al. 2020

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The oscillatory Briggs‐Rauscher (BR) reaction was applied on solid insoluble materials i. e. bentonite clays. Under the same BR experimental conditions, the addition of identical masses of bentonite of different origin resulted in different effects on oscillatory time duration (τ): no influence, quenching, or prolongation. It was found that the following bentonite properties: montmorillonite/beidellite ratio; cation exchange capacity; principal exchange cation; extent of iron leaching in acidic environment of BR reaction; and specific surface area of clay were not exclusively responsible for observed behavior. On the other hand, the influence of added mass, for all investigated clays, resulted in the same behavior pattern. The increase of the mass of added clay increased τ up to the certain maximal value (τmax, mmax) characteristic for each clay. Further increase of mass resulted in quenching. Therefore, (τmax, mmax) pair can be regarded as the “fingerprint” characteristic of bentonite useful for identification of its origin. Furthermore, the addition of naturally occurring and non‐toxic clay in an oscillatory reaction can offer a versatile approach to tune the oscillation dynamics of nonlinear chemical systems.

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CER/Montmorillonite Nanocomposites

Bershteĭn

Yakushev

2023

Springer Series in Materials Science

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Clay Science

Cited by 137 publications

References 61 publications

Acid leaching vermiculite: A multi-functional solid catalyst with strongly electrostatic field and Brönsted acid for depolymerization of cellulose in water

Acid leaching vermiculite: A multi-functional solid catalyst with strongly electrostatic field and Brönsted acid for depolymerization of cellulose in water

Oscillatory Briggs‐Rauscher Reaction as “Fingerprint” for Bentonite Identification: The Fine‐Tuning of Oscillatory Dynamics with Addition of Clay

CER/Montmorillonite Nanocomposites

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