Selective catalytic oxidation of H2S using nonhydrolytic vanadia-titania xerogels

Cho, Dal-Rae; Kim, Sang-Yun; Park, Dae‐Won; Mutin, P. Hubert

doi:10.1007/s11814-009-0063-4

Cited by 14 publications

(5 citation statements)

References 26 publications

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“…92 Mesoporous crystalline titania-vanadia catalysts with narrow pore size distribution and specific surface areas ranging from 64 to 88 m 2 g À1 were prepared in one step by the ether route. [93][94][95] In this case, scanning electron microscopy (SEM) images show the presence of spherical particles (B3 mm in diameter) made of an agglomeration of primary nanoparticles of about 20 nm (Fig. 2).…”

Section: Texture Controlmentioning

confidence: 88%

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Non-hydrolytic sol–gel routes to heterogeneous catalysts

2012

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Oxides and mixed oxides have a tremendous importance in the field of heterogeneous catalysis, serving either as catalysts or as supports for active species. The performance of a catalyst depends directly on its composition, texture, structure and surface properties, which have to be precisely controlled and adapted to each application. In this context, the sol-gel process is a unique tool for the preparation and understanding of catalytic materials, owing to its exceptional versatility. In the last 10 years, the non-hydrolytic sol-gel (NHSG) or non-aqueous sol-gel process based on nonhydrolytic condensations in nonaqueous media has established itself as a simple and powerful method for the design of a wide range of oxide, mixed oxide and hybrid materials with controlled composition, morphology, texture and structure. NHSG proved particularly interesting for the preparation of catalytic materials, notably mesoporous xerogels, single site catalysts and highly crystalline nanoparticles. This critical review addresses the application of NHSG to the preparation of heterogeneous catalysts, emphasizing the specificities of this process, and giving a comprehensive overview of the literature (251 references).

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Section: Texture Controlmentioning

confidence: 88%

“…175 Thus Park et al have applied to this reaction V-Ti catalysts prepared via the ether route, by reaction of VOCl 3 and TiCl 4 with i Pr 2 O under autogenous pressure at 110 1C for 3 days. 95 After vacuum drying, the catalysts were calcined at 500 1C. The V 2 O 5 loading ranged between 6.5 and 18.3 wt%.…”

Section: Oxide and Mixed Oxide Catalystsmentioning

confidence: 99%

Non-hydrolytic sol–gel routes to heterogeneous catalysts

2012

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“…It is clear that reducing reducibility of Vsites could favor a decrease of the rate of consecutive reaction. However, this will depend on the reaction conditions, especially reaction temperature and feed composition [6][7][8][9][10][11][12][13]38].…”

Section: Discussionmentioning

confidence: 99%

Catalytic behavior of NaV6O15 bronze for partial oxidation of hydrogen sulfide

et al. 2014

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ElsevierSoriano Rodríguez, MD.; Rodriguez-Castellon, E.; Garcia-Gonzalez, E.; López Nieto, JM. (2014). Catalytic behavior of NaV6O15 bronze for partial oxidation of hydrogen sulfide. Catalysis AbstractNa-containing V2O5 materials have been prepared hydrothermally from gels with Na/V ratios of 0.02 to 0.34, and calcined at 500ºC. The calcined samples have been characterized and tested as catalysts in the partial oxidation of H2S to elemental sulfur.At low Na-contents, V2O5 and NaV6O15 bronze are formed, with the NaV6O15/V2O5 ratio increasing with the Na-content. Pure NaV6O15 bronze is mainly formed from gels containing a Na/V ratio of 0.18. However, NaV6O15 and NaV3O8 bronzes are formed at from gels with Na/V ratio higher than 0.35. NaV6O15 based catalyst shows high conversion for the oxidation of H2S with a high selectivity into elemental sulfur. These catalysts are more active and stable than pure or Na-doped V2O5 catalysts. V4O9 is observed in used catalysts derived from pure and Na-doped V2O5 and materials containing NaV6O15/V2O5 mixtures. However, no changes in the NaV6O15 crystalline structure are observed in pure and NaV6O15/V2O5 mixtures catalysts. Accordingly, NaV6O15 crystalline phase is stable for several hours of catalysis at a difference with V2O5. The active sites in V-containing vanadium catalysts are probably V 5+ -O-V 4+ pairs as proposed for V4O9 crystalline phase. The best catalytic performances were achieved on V2O5-NaV6O15 mixtures which are transformed to V4O9-NaV6O15 mixtures during the catalytic tests. These catalytic results could be due to the intrinsic physical properties of both phases but also because of the optimal dispersion.Keywords: NaV 6 O 15 bronze, V 2 O 5 , V 4 O 9 , selective oxidation of hydrogen sulfide to sulfur, Na-doped vanadium oxide catalyst 3

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“…The exit gas from the analyzer was passed through a trap containing a concentrated NaOH solution and vented to a hood. The conversion (%) of H 2 S and the selectivity (%) toward products including SO 2 , S, and ATS are defined as follows [9,12]:…”

Section: Reaction Testsmentioning

confidence: 99%

“…We have previously reported a new vapor phase catalytic process for the selective conversion of H 2 S in a stream containing both ammonia and water [8][9][10][11][12]. ATS has been used in photography and agricultural applications.…”

Section: Introductionmentioning

confidence: 99%