New reactions of betulin with sulfamic acid and ammonium sulfamate in the presence of solid catalysts

Kazachenko, Аleksandr S.; Vasilieva, Natalya; Fetisova, Olga Yu.; Sychev, Valentine V.; Elsuf’ev, Evgeniy V.; Malyar, Yuriy N.; Issaoui, Noureddine; Miroshnikova, Angelina V.; Borovkova, Valentina S.; Berezhnaya, Yaroslava D.; Skripnikov, Andrey M.; Zimonin, Dmitry V.; Ionin, Vladislav A.

doi:10.1007/s13399-022-02587-x

Cited by 25 publications

(13 citation statements)

References 67 publications

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“…It should be noted that the data obtained in this work are slightly different from the results reported in the studies on preparing the sulfo-derivatives of betulin [ 17 , 35 ], which may be due to the nature of the initial compounds and their different stabilities in the acid hydrolytic destruction processes [ 1 , 2 , 3 ].…”

Section: Resultscontrasting

confidence: 85%

“…Next, the catalyst matrix and the acidic form of WSSL sulfate exchange via ammonium cations. This scheme is similar to our scheme for the catalytic sulfation of betulin [ 17 , 35 ].…”

Section: Resultsmentioning

confidence: 86%

“…The catalyst’s acidity was estimated using the point of zero charge (PZC) by the Sørensen–de Bruijn method [ 35 , 36 ], i.e., by measuring the acidity of a solid suspension upon reaching the isoelectric point (non-measurable electrode values) corresponding to pH of the solid suspension.…”

Section: Methodsmentioning

confidence: 99%

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Sulfation of Wheat Straw Soda Lignin with Sulfamic Acid over Solid Catalysts

et al. 2022

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Soda lignin is a by-product of the soda process for producing cellulose from grassy raw materials. Since a method for the industrial processing of lignin of this type is still lacking, several research teams have been working on solving this problem. We first propose a modification of soda lignin with sulfamic acid over solid catalysts. As solid catalysts for lignin sulfation, modified carbon catalysts (with acid sites) and titanium and aluminum oxides have been used. In the elemental analysis, it is shown that the maximum sulfur content (16.5 wt%) was obtained with the Sibunit-4® catalyst oxidized at 400 °C. The incorporation of a sulfate group has been proven by the elemental analysis and Fourier-transform infrared spectroscopy. The molecular weight distribution has been examined by gel permeation chromatography. It has been demonstrated that the solid catalysts used in the sulfation process causes hydrolysis reactions and reduces the molecular weight and polydispersity index. It has been established by the thermal analysis that sulfated lignin is thermally stabile at temperatures of up to 200 °C. According to the atomic force microscopy data, the surface of the investigated film consists of particles with an average size of 50 nm. The characteristics of the initial and sulfated β-O-4 lignin model compounds have been calculated and recorded using the density functional theory.

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Section: Resultscontrasting

confidence: 85%

“…Next, the catalyst matrix and the acidic form of WSSL sulfate exchange via ammonium cations. This scheme is similar to our scheme for the catalytic sulfation of betulin [ 17 , 35 ].…”

Section: Resultsmentioning

confidence: 86%

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Sulfation of Wheat Straw Soda Lignin with Sulfamic Acid over Solid Catalysts

et al. 2022

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“…The transition metal oxides, which include Fe 2 O 3 , ZnO 2 , TiO 2 , CuO, Al 2 O 3 , and MgO, can be widely used as catalysts due to their low cost, anti-toxicity, and high catalytic activity [22][23][24]. Choi et al [25] mentioned that Al 2 O 3 was usually used as a catalyst because of its thermally stable and relatively high thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of Naphthalene by Dielectric Barrier Discharge in Conjunction with a Catalyst at Atmospheric Pressure

Zheng

Xiao

et al. 2022

Catalysts

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In this study, coaxial dielectric barrier discharge (DBD) plasma, in conjunction with a metal oxide catalyst, was used to degrade naphthalene. The characteristics of plasma discharge were studied by measuring voltage and current waveforms and the Lissajous figure. The effects of different parameters of the process on naphthalene decomposition in air were investigated. XRD, BET, and SEM data were used to investigate the nature, specific surface area, and surface morphology of the catalyst. The results show that the mineralization of naphthalene reached 82.2% when the initial naphthalene concentration was 21 ppm and the total gas flow rate was 1 L/min in the DBD reactor filled with Al2O3. The mineralization of naphthalene first increased and then became stable with the increase in treatment time and discharge power. The TiO2 catalyst has more apparent advantages than the two other studied catalysts in terms of the removal efficiency and mineralization of naphthalene due to this catalyst’s large specific surface area, porous structure, and photocatalytic properties. In addition, the introduction of a small amount of water vapor can promote the mineralization and CO2 selectivity of naphthalene. With further increases in the water vapor, Fe2O3 has a negative effect on the naphthalene oxidation due to its small pore size. The TiO2 catalyst can overcome the adverse effects of water molecule attachment due to its photocatalytic properties.

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“…The use of photocatalytic materials in asphalt [ 1 , 2 ] and concrete pavements [ 3 , 4 , 5 ], façade elements [ 6 , 7 , 8 , 9 ], and engineering structures such as tunnels [ 10 , 11 , 12 ] has been described in the literature. Photocatalytic materials have been also widely applied in other processes such as a synthesis of number of novel substances [ 13 ]. Studies on the mechanism of photocatalysis building materials have focused on the use of semiconductor materials as a photocatalyst for the removal of ambient airborne pollutants such as nitrogen oxides (NO x ) and volatile organic compounds (VOCs) [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Ozone Formation during Photocatalytic Oxidation of Nitric Oxides under UV Irradiation with the Use of Commercial TiO2 Photocatalytic Powders

et al. 2022

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The application of photocatalytic materials has been intensively researched in recent decades. The process of nitric oxide (NO) oxidation during photocatalysis has been observed to result in the formation of nitric dioxide (NO2). This is a significant factor of the photocatalysis process, as NO2 is more toxic than NO. However, it has been reported that ozone (O3) is also formed during the photocatalytic reaction. This study analyzed the formation and oxidationof O3 during the photocatalytic oxidation of NO under ultraviolet irradiation using commercial photocatalytic powders: AEROXIDE® TiO2 P25 by Evonik, KRONOClean® 7050 by KRONOS®, and KRONOClean® 7000 by KRONOS®. An NO concentration of 100 ppb was assumed in laboratory tests based on the average nitric oxide concentrations recorded by the monitoring station in Warsaw. A mix flow-type reactor was applied in the study, and the appropriateness of its application was verified using a numerical model. The developed model assumed an empty reactor without a photocatalytic material, as well as a reactor with a photocatalytic material at its bottom to verify the gas flow in the chamber. The analysis of the air purification performance of photocatalytic powders indicated a significant reduction of NO and NOx and typical NO2 formation. However, no significant formation of O3 was observed. This observation was verified by the oxidation of pure ozone in the process of photocatalysis. The results indicated the oxidation of ozone concentration during the photocatalytic reaction, but self-decomposition of a significant amount of the gas.

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New reactions of betulin with sulfamic acid and ammonium sulfamate in the presence of solid catalysts

Cited by 25 publications

References 67 publications

Sulfation of Wheat Straw Soda Lignin with Sulfamic Acid over Solid Catalysts

Sulfation of Wheat Straw Soda Lignin with Sulfamic Acid over Solid Catalysts

Decomposition of Naphthalene by Dielectric Barrier Discharge in Conjunction with a Catalyst at Atmospheric Pressure

Ozone Formation during Photocatalytic Oxidation of Nitric Oxides under UV Irradiation with the Use of Commercial TiO2 Photocatalytic Powders

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