Mechanism of the Adsorption of Organic Sulphur Compounds by Oxides and Zeolites

Lyapina, N. K.; Lygin, V. I.; Ulendeeva, A. D.

doi:10.1070/rc1980v049n06abeh002485

Cited by 6 publications

(4 citation statements)

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“…Taking into consideration the data on adsorption of reagents and the results of their transformations on catalysts with diverse acid-base properties of the surface [3,4,[6][7][8][9] it is presumable that the reaction proceeds through the stages of the decomposition of dimethyl disulfi de to methanethiol and the dehydration of methanol resulting in the formation of surface CH 3 groups that further react with the formation of dimethyl sulfi de. The mechanism of this reaction is evidently similar to that described in [6] for the formation of dimethyl ether from methanol.…”

Section: Methodsmentioning

confidence: 99%

New method of dimethyl sulfide synthesis

Mashkina

2011

Russ J Org Chem

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The synthesis of dimethyl sulfi de consists in the reaction of dimethyl disulfi de with methanol in the presence of solid catalyst, aluminum γ-oxide. The yield of dimethyl sulfi de grows with growing temperature, contact time, and content of methanol in the reaction mixture. At 350-400°C, molar ratio methanol-dimethyldisulfi de 2.0-2.5, and total conversion of the reagents the yield of dimethyl sulfi de reached 95 mol%.

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Section: Methodsmentioning

confidence: 99%

New method of dimethyl sulfide synthesis

Mashkina

2011

Russ J Org Chem

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“…Combined with adsorption of test molecules such as CO, this technique enables one to estimate the strength and concentration of surface sites and to follow their occupation or the creation of new sites after adsorption of other molecules. 1 Thiophene adsorption has been studied so far spectroscopically mostly on hydrotreatment (HDT) catalysts (see ref 2 and references cited therein), on acid sites of oxides used as HYT supports, such as alumina, [3][4][5][6] silica, 7,8 or of zeolites, [8][9][10][11] both pure or modified by transition-metal cations. Interaction of thiophene with basic sites has not been studied much yet, although the development of HDT catalysts supported on basic oxides is considered to be very promising for gasoline production.…”

Section: Introductionmentioning

confidence: 99%

“…Thiophene adsorption has been studied so far spectroscopically mostly on hydrotreatment (HDT) catalysts (see ref and references cited therein), on acid sites of oxides used as HYT supports, such as alumina, − silica, , or of zeolites, − both pure or modified by transition-metal cations. Interaction of thiophene with basic sites has not been studied much yet, although the development of HDT catalysts supported on basic oxides is considered to be very promising for gasoline production.…”

Section: Introductionmentioning

confidence: 99%

IR Study of the Adsorption and Isotopic Scrambling of Thiophene on CaO

2003

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Thiophene, thiophene-2,5-d 2, and thiophene-d 4 adsorption on CaO activated at 723−973 K has been investigated at 170−300 K by means of IR spectroscopy and IR analysis of desorbed gas. Molecular adsorption of thiophene occurs on surface oxygen ions and basic OH groups by weak H-bonding of CH groups with the lone electron pairs of oxygen. On the most basic oxygen ions of CaO activated at 973 K, thiophene dissociates already at 200 K with the formation of surface OH groups and thiophenide C4H3S- anions. This reversible dissociation accounts for the catalytic reaction of isotopic scrambling of thiophene-2,5-d 2 that takes place already at 220 K and leads to the appearance of all 10 possible thiophene isotopomers in the desorbed gas. Experiments with thiophene coadsorption with CO enable one to associate the sites of thiophene dissociation with those oxygen ions that bound CO giving carbonite CO2 2- ions. Three kinds of such sites could be distinguished, which differ in the band positions of the resulting OH groups and in thermal stability of corresponding thiophenide anions.

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“…The mechanism of adsorption of some short chain organic sulfur compounds on oxides and zeolites has been reviewed by Lyapina et al 25. The mechanism of adsorption of some short chain organic sulfur compounds on oxides and zeolites has been reviewed by Lyapina et al 25.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Sulfur from Canola Oil

Cho‐Ah‐Ying

deMan

1991

Fett/Lipid

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The presence of sulfur compounds in canola oil is mainly responsible for nickel catalyst poisoning during hydrogenation. In this study, different adsorbents (alumina, alumina-silicate, diatomaceous silica and silica gel) were used in conjunction with different bleaching earths (AOCS official natural bleaching earth, G 160 from Harshaw-Filtrol and montmorillonite K10 from Aldrich Chemical Co.) to remove the three types of sulfur compounds [total sulfur (TS), h e y nickel sulfur (RS) and volatile sulfur (VS)] from canola oil. The TS content of the oil was not affected during bleaching. The AOCS bleaching earth removed 28.6-36.4% RS and 57.8-78.90/0 VS in the bleaching temperature range of 12O-15O0C. The some bleaching earth, in combination with 6 % TriSyl (micronized silicon dioxide adsorbent) 45.7-81.4% RS and 73.3-95.6% VS were successfully removed.TriSyl also improved the chlorophyll content and color of the oil bleached at 120%. Bleachingat 12OOC with G 160 and K 10 removed 44 and 81 O h RS and 69 and 61% VS respectively. These two bleaching earths, in combination with alumina, alumina-silicate, diatomaceous silica or silica gel did not further improve the removal of all the three types of sulfur present in the oil.

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Mechanism of the Adsorption of Organic Sulphur Compounds by Oxides and Zeolites

Cited by 6 publications

References 0 publications

New method of dimethyl sulfide synthesis

New method of dimethyl sulfide synthesis

IR Study of the Adsorption and Isotopic Scrambling of Thiophene on CaO

Adsorptive Removal of Sulfur from Canola Oil

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