Characterization of sepiolite as a support of silver catalyst in soot combustion

Güngör, Nurfer; İşçi, Sevim; Günister, Ebru; Miśta, W.; Teterycz, Helena; Klimkiewicz, Roman

doi:10.1016/j.clay.2006.03.005

Cited by 44 publications

(16 citation statements)

References 26 publications

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“…The association of barite with fibrous clays may be influenced by the ability of clay particles to preferentially adsorb Ba, which when combined with available sulfate, may form barite (Hanor, 2000). Palygorskite and sepiolite fibers have high surface areas (150-600 m 2 /g) (Cases et al, 1991;Galan, 1996;Güngör et al, 2006), low to moderate CEC values (5-45 meq/100 g) (Birkeland, 1999), and pore volumes ranging from 0.13 to 0.34 cm 3 /g (Güngör et al, 2006). Fiber arrangement and high surface area create a microporous environment within the soil matrix (Grillet et al, 1988;VarasMuriel and Molina-Ballesteros, 2004) and also make these clays highly desirable for sorption of organic and inorganic materials (Galan, 1996;Leguey et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Micromorphological investigation of pedogenic barite in Mormon Mesa petrocalcic horizons, Nevada USA: Implication for genesis

2012

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Section: Discussionmentioning

confidence: 99%

Micromorphological investigation of pedogenic barite in Mormon Mesa petrocalcic horizons, Nevada USA: Implication for genesis

2012

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“…Sepiolite, as a catalyst support, has been investigated by some researchers. For example Güngör et al 33 used it as a silver support in combustion of soot. In 2010, a sepiolite based catalyst support was synthesized by Milt et al 34 for removal of diesel exhaust pollutants.…”

Section: Catalytic Removal Of Toluene From Air Streams By Cobalt Oxidmentioning

confidence: 99%

Catalytic Removal of Toluene from Air Streams by Cobalt Oxide Supported on Sepiolite

Ardakani¹,

Jafari²

2019

J. Braz. Chem. Soc.

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Removal of toluene using cobalt oxide supported on sepiolite catalysts was investigated. Deposition precipitation method was used to prepare the catalysts. The catalysts were characterized using X-ray diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, thermogravimetric analysis (TGA) and Brunauer-Emmet-Teller methods. The results of catalytic testing showed that 20% cobalt oxide/sepiolite (Co20/Sep) had higher catalytic activity for degradation of toluene. A temperature of 400 °C was found to be the optimum calcination temperature for Co20/Sep, since it achieved 90% toluene conversion at about 300 °C. The results showed that the selectivity of the catalysts towards CO 2 was complete and no byproducts were detected. Stability tests also indicated that Co20/Sep remains stable at 320 °C with complete conversion of toluene after 24 h. In conclusion, the results of this study confirmed sepiolitesupported cobalt oxide catalyst as an efficient catalyst for degradation of toluene.

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“…Unlike other 2:1 trioctahedral silicates, it has discontinuities and inversions of the silica sheets that give rise to fine microporous channels of dimensions 0.37 9 1.06 nm [2] running parallel to the length of the fibers and a specific surface area of 300 m 2 /g, about 50% of which within the paralleled pores and the other half in the mesoporosity [3]. As a fibrous natural clay mineral, sepiolite has many advantages, such as abundant storage, low price, good properties, and reutilization, and moreover, it has a brilliant applicative prospect in the industrial fields of adsorption [4,5], rheology [6], and catalysis [7,8], due to its unique microporous structure.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of porous materials from sepiolite

Wang

Jing

et al. 2011

Res Chem Intermed

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In order not only to manufacture a tough porous material from sepiolite but also to sustain the inherent properties of the sepiolite, a hydrothermal experiment was carried out under saturated steam pressure at 473 K for up to 24 h by mixing slaked lime. The experimental results show that the addition of slaked lime exerts a positive effect on the strength development, and the strength enhancement is found to be due to tobermorite and calcium silicate hydrate (CSH) gel formation. Curing time seems to condition the strength development. A fine particle size of sepiolite improves its activity during the hydrothermal process, thus offering a higher strength and quicker hardening rate of the synthesized specimen. The acid activation also has a beneficial effect on the strength development. The hardening mechanism of the synthesized specimen is different between the specimens synthesized with or without acid activation. The strength enhancement for sepiolite with acid activating is due mainly to CSH gel formation, instead of tobermorite formation without acid activation.

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Characterization of sepiolite as a support of silver catalyst in soot combustion

Cited by 44 publications

References 26 publications

Micromorphological investigation of pedogenic barite in Mormon Mesa petrocalcic horizons, Nevada USA: Implication for genesis

Micromorphological investigation of pedogenic barite in Mormon Mesa petrocalcic horizons, Nevada USA: Implication for genesis

Catalytic Removal of Toluene from Air Streams by Cobalt Oxide Supported on Sepiolite

Hydrothermal synthesis of porous materials from sepiolite

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