Vanadia-doped titania-pillared montmorillonite clay for the selective catalytic oxidation of H2S

Bineesh, Kanattukara V.; Cho, D.R.; Kim, S.Y.; Jermy, B. Rabindran; Park, D.W.

doi:10.1016/j.catcom.2008.03.048

Cited by 45 publications

(42 citation statements)

References 26 publications

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“…It has been proposed that the selective oxidation of H2S is carried out by a redox mechanism involving lattice oxygen [6][7][8][9][10]. Our results suggest that the catalyst reoxidation could be the determining-reaction step, favoring a partial reduction of the catalyst.…”

Section: The Characterization Results Carried Out By Raman and Exafs-mentioning

confidence: 62%

“…At the moment, it is known that the characteristics of the metal oxide support and the nature of vanadium species strongly influence the catalytic performance and stability of supported vanadium catalysts during the partial oxidation of H2S [6][7][8][9][10], although the catalysts could be modified during the reaction depending on the characteristics of catalysts and/or the reaction conditions. In this way, the reducing power of reactants seems to be an important factor in the partial oxidation of H2S over V2O5 catalyst [11].…”

mentioning

confidence: 99%

“…In addition to the oxidative dehydrogenation of short chain alkanes [4,5], an important effort to study these catalytic systems in the partial oxidation of H2S to elemental sulfur has been carried out in the last years [6][7][8][9][10]. At the moment, it is known that the characteristics of the metal oxide support and the nature of vanadium species strongly influence the catalytic performance and stability of supported vanadium catalysts during the partial oxidation of H2S [6][7][8][9][10], although the catalysts could be modified during the reaction depending on the characteristics of catalysts and/or the reaction conditions.…”

mentioning

confidence: 99%

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Operando XAS and Raman study on the structure of a supported vanadium oxide catalyst during the oxidation of H2S to sulphur

Holgado¹,

Soriano²,

Jiménez-Jiménez³

et al. 2010

Catalysis Today

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(2010). Operando XAS and Raman study of the structure of supported vanadium oxide during the oxidation of H2S to sulphur. Catalysis Today. 155(3-4):296-301. doi:10.1016/j.cattod.2010.02.050. 1Operando XAS and Raman study on the structure of a supported vanadium oxide catalyst during the oxidation of H2S to sulphur AbstractThe modification of crystalline phases of a vanadium oxide supported on mesoporous zirconium phosphate during the partial oxidation of H2S to sulphur has been studied by using an operando Raman-GC approach and XAS in reaction conditions. The catalyst, mainly presenting crystalline V2O5, is transformed during the oxidation of H2S at 200ºC, presenting crystals of V4O9, which is identified by the presence of a band at ca.900 cm -1 in the Raman spectra (using a 785 nm line of an Argon ion laser) and by the presence of a pre-edge at 5469.8 eV (and a main-edge at 5482.2 eV) in XANES spectra.At the same time, it is observed a high conversion of H2S to sulphur (the main reaction product) and SO2 (as minority). Both activity and selectivity depend on the time on stream. In this way, the selectivity to SO2 decreases from ca. 5 to 1% with the time on Keyword: Operando, RAMAN, EXAFS, XANES, partial oxidation of hydrogen sulphide, vanadium oxides supported on mesoporous zirconium phosphate.3

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Section: The Characterization Results Carried Out By Raman and Exafs-mentioning

confidence: 62%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Operando XAS and Raman study on the structure of a supported vanadium oxide catalyst during the oxidation of H2S to sulphur

Holgado¹,

Soriano²,

Jiménez-Jiménez³

et al. 2010

Catalysis Today

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show abstract

“…It relates, for example, to α-МоО 3 , which is one-dimensional rod [64] to layered double hydroxides (LDHs) M [65][66][67][68][69][70]). They include centers of acid and Lewis types (three-coordinate Al 3+ cations substituting Si 4+ in tetrahedral layers), as well as Brőnsted centers (containing Si-OH-Al-groups).…”

Section: Composition Structure and Intercalation Properties Of Layementioning

confidence: 99%

“…3 Synthetic hydrotalcite Ex 0.66 [Li 0 . 66 The layered materials are distinguished as two types by their architecture and properties. First of them is characterized by stiff pores with a constant volume, parallel insulation of the lattice channels and communicating channels of the network.…”

Section: Composition Structure and Intercalation Properties Of Layementioning

confidence: 99%

Physical Chemistry of Intercalated System

Pomogailo

Джардималиева

2014

Nanostructured Materials Preparation via Condensation Ways

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The driving force of development of intercalation chemistry is significant improvement of properties of fabricated nanocomposites and design of materials with new properties. Forming hybrid structures (sometimes called "ship-in-the-bottle") define important functional characteristics: improved mechanical strength (increase in modulus), enhanced stiffness, heat resistance (decrease in thermal expansion coefficient), heat stability, and other thermal physical properties, water resistance, interesting barrier properties for gas separation, high flame and fire resistance, electric and electrochemical behavior, size stability, chemical stability, different from the simple additive properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].Hybrid-phase nanocomposites [21] are not only of academic, but of commercial interest, because they posses improved mechanical and thermal properties as compared with the same content of conventional fillers (such as carbon soot or deposited silica gel). The methods of production of hybrid nanocomposites from polymer solutions or polymerization in situ in combination with delamination and exfoliation were already studied at the end of the last century (for example, [22,23]). However, there were technological drawbacks: these methods had low correlation with polymer production and demanded great amounts of organic solvents. At the beginning of 1990s more convenient technique appeared on the basis of PEO (polyethylene-oxide) and MMT (montmorillonite), which advantageously demonstrated the intercalation process in the polymer melt, as well as potential applications of the obtained products in solid phase electrolytes of recharged lithium batteries.However, highly promising commercial strategy in this problem was formulated after the group of researchers of Toyota company [24][25][26] had found extraordinary strengthening of mechanical properties of polymer-layered nylon-based nanocomposites, which was caused by extremely large surface contacts of the ingredients and high aspect ratio reached in the intercalation/exfoliation process, and by homogenous dispersion of silica plates in the polymer matrix [27,28]. On the one hand, these functional materials have a relation to nanocomposites via

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On the nature of Ti(IV)‐pillared layered metal hydroxides prepared from green, water‐soluble Ti‐peroxide

Shi

Shu

et al. 2009

AIChE Journal

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Ti-peroxide pillared layered double hydroxides (LDHs) have been prepared for the first time using water-soluble Ti-peroxide as an intercalating precursor. It is novel and alluring that the whole preparation procedure does not involve any usage of organic or chlorine-containing hazards. Intercalated into the LDH interlayer region, Ti-peroxide is prevented partially from condensation in the solvent evaporation. The interlayer TiAO 2 unit exists in triangular (g 2 ) structure with C 2m symmetry in most cases, giving an interlayer gallery of 0.50-0.60 nm. But in the case of pH 4.0, monodentate (g 1 ) structure is also observed, giving an interlayer gallery of 0.70 nm. All the Ti-peroxide pillared LDHs prepared in this work show catalytic activity in the selective oxidation of thioether. The Ti-peroxide introduced into the interlayer regions of Mg/Al LDH with a particle size of around 50-120 nm exhibits better recyclability than Ti-peroxide gel, either in bulk or adsorbed on the exterior surface of LDH particles. V

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Vanadia-doped titania-pillared montmorillonite clay for the selective catalytic oxidation of H2S

Cited by 45 publications

References 26 publications

Operando XAS and Raman study on the structure of a supported vanadium oxide catalyst during the oxidation of H2S to sulphur

Operando XAS and Raman study on the structure of a supported vanadium oxide catalyst during the oxidation of H2S to sulphur

Physical Chemistry of Intercalated System

On the nature of Ti(IV)‐pillared layered metal hydroxides prepared from green, water‐soluble Ti‐peroxide

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