Synthesis of octahydro-2H-chromen-4-ol from vanillin and isopulegol over acid modified montmorillonite clays: Effect of acidity on the Prins cyclization

Timofeeva, Maria N.; Волчо, К. П.; Mikhalchenko, Oksana S.; Panchenko, Valentina N.; Krupskaya, V. V.; Tsybulya, S. V.; Gil, Antonio; Vicente, M.A.; Salakhutdinov, N. F.

doi:10.1016/j.molcata.2014.11.016

Cited by 38 publications

(29 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Presence of Na + in the montmorillonites from the Taganskoye deposit was also confirmed in previous studies [26,42,43]. (Figure 1).…”

Section: Transformation Of the Montmorillonite Structure Under Acid Tsupporting

confidence: 89%

“…Early, we demonstrated that the chemical composition and structural characteristics of Mt depended on the HNO 3 and HCl concentration [26,32]. Changes of chemical composition and interlayer space were negligible after modification of montmorillonite under the concentrations up to 0.5 M. These changes were noticeable only after treatment with 3.0 M acid.…”

Section: Transformation Of the Montmorillonite Structure Under Acid Tmentioning

confidence: 87%

“…A significant increase in the specific surface of the acid-modified clays promotes wide use of such material for removal of heavy metals, radionuclides and for oil refining [15][16][17][18][19]. The transformation of the structure and properties of bentonite under the influence of acids, mostly under sulfuric and hydrochloric acids, have been studied by different authors [20][21][22][23][24][25][26]. Using ultrasound and microwaves in addition to an acid treatment intensifies smectite mineral transformation [27].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

et al. 2017

View full text Add to dashboard Cite

This paper discusses the mechanism of montmorillonite structural alteration and modification of bentonites' properties (based on samples from clay deposits Taganskoye, Kazakhstan and Mukhortala, Buriatia) under thermochemical treatment (treatment with inorganic acid solutions at different temperatures, concentrations and reaction times). Treatment conditions were chosen according to those accepted in chemical industry for obtaining acid modified clays as catalysts or sorbents. Also, more intense treatment was carried out to simulate possible influence at the liquid radioactive site repositories. A series of methods was used: XRD, FTIR, ICP-AES, TEM, nitrogen adsorption, and particle size analysis. It allowed revealing certain processes: transformation of montmorillonite structure which appears in the leaching of interlayer and octahedral cations and protonation of the interlayer and -OH groups at octahedral sheets. In turn, changes in the structure of the 2:1 layer of montmorillonite and its interlayer result in significant alterations in the properties: reduction of cation exchange capacity and an increase of specific surface area. Acid treatment also leads to a redistribution of particle sizes and changes the pore system. The results of the work showed that bentonite clays retain a significant portion of their adsorption properties even after a prolonged and intense thermochemical treatment (1 M HNO 3 , 60 • C, 108 h).

show abstract

“…Presence of Na + in the montmorillonites from the Taganskoye deposit was also confirmed in previous studies [26,42,43]. (Figure 1).…”

Section: Transformation Of the Montmorillonite Structure Under Acid Tsupporting

confidence: 89%

Section: Transformation Of the Montmorillonite Structure Under Acid Tmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Also, this fact was confirmed by the EDX data (Tab. 2), and described in previous studies of the bentonites from Taganskoye deposit [12,13]. Treatment of Mt-M sample with hydrochloric acid solution with various concentrations leads to partial protonation of interlayer, which is observed by a decrease of d00l values and changes of basal reflections series from d001 = 15.3Å, d003 = 5.0Å, d005 = 3.0Å to d001 = 13.7Å.…”

Section: Introductionmentioning

confidence: 75%

“…2a) after the treatment of Mt-T2 sample with HNO3 acid for 108 hours. Previous studies of Mt-М and Мt-Т1 samples treated with HCl acid [13] showed the reduction of bands intensity at 841-845 cm -1 (Al-Mg-OH), 882 cm -1 (Al-Fe-OH) and 914-926 cm -1 (Al-Al -OH), which indicates the leaching of Al 3+ , Mg 2+ and Fe 3+ cations from the octahedral sites [14,17,18,19,20]. Reduction of the band intensities at 925 and 876 cm-1 is shown at Fig.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Montmorillonite Structure and Transformation of its Properties under the Treatment of Inorganic Acid Solutions

Krupskaya

Закусин

Tyupina

et al. 2016

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract:The paper discusses the mechanism of montmorillonite structure alteration and bentonites properties modification (on the example of samples from clay deposit Taganka, Kazakhstan) due to the thermochemical treatment (treatment with inorganic acid solutions at different temperatures, concentrations and reaction times). With the use of the suit of methods certain processes were distinguished: transformation of montmorillonite structure, which appears in the leaching of interlayer and octahedral cations, protonation of the interlayer and OH groups at octahedral sheets. Changes in the structure of the 2:1 layer of montmorillonite and its interlayer result in significant changes in the properties -reduction of cation exchange capacity and an increase of specific surface area. The results of the work showed that bentonite clays retain a significant portion of its adsorption properties even after the long term and intense thermochemical treatment (6M HNO3, 60°C, 108 hours)

show abstract

Recent Progress in Solketal Synthesis from Glycerol and Acetone

Wang,

Du,

Zhang

et al. 2024

ChemistrySelect

View full text Add to dashboard Cite

The extensive use of biodiesel leads to the excess of glycerol as a by‐product. But as a carbon resource, it has been increasingly used in organic synthesis of high value‐added derivatives in recent years. Among them, solketal is one of the most important derivatives of glycerol, which is generated by the reaction of glycerol and acetone. Based on a large number of relevant literatures, this paper systematically summarized the relevant researches in recent ten years. We systematically summary the latest research progress on the synthesis of solketal by glycerol and acetone. We have focused on a systematic study of four different reaction mechanisms for the ketonation reaction of glycerol and acetone. And the types of catalysts were classified into two categories, homogeneous catalysts and non‐homogeneous catalysts, and the non‐homogeneous catalysts were further classified in more details for the study. This review provides a more comprehensive reference for the ketal reaction of glycerol and acetone, and develops some new ideas for the transformation.

show abstract

Synthesis of octahydro-2H-chromen-4-ol from vanillin and isopulegol over acid modified montmorillonite clays: Effect of acidity on the Prins cyclization

Cited by 38 publications

References 19 publications

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

Experimental Study of Montmorillonite Structure and Transformation of its Properties under the Treatment of Inorganic Acid Solutions

Recent Progress in Solketal Synthesis from Glycerol and Acetone

Contact Info

Product

Resources

About