Carbon monoxide oxidation over microfiltration ceramic membranes

Krivoshapkina, Elena F.; Vedyagin, Aleksey A.; Desyatykh, I. V.

doi:10.1134/s0965544115100096

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…[21]. Components required to obtain the cordierite with formula Mg 2 Al 4 Si 5 O 18 were mixed in the stoichiometric www.springer.com/journal/40145 13 ratio as follows: 43 wt% bauxite, 21 wt% silica sand, and 36 wt% talc, or 52 wt% kaolinite, 36 wt% talc, and 12 wt% alumina.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Al2O3–SiO2–MgO ceramics with hierarchical porous structure

Krivoshapkina

Vedyagin

2017

J Adv Ceram

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A series of asymmetric cordierite ceramics with hierarchical porous structure were prepared and characterized. The macroporous support was obtained from natural raw materials (bauxite, silica sand, kaolinite, talc, and alumina) via ceramic technology. The prepared ceramic discs were characterized by a narrow pore size distribution. The average pore size was about 9.5 µm, and the open porosity was estimated to be 30%. Coating the discs with micro/mesoporous cordierite layer was performed using the sol-gel approach. Three-component sols were obtained from organic or inorganic precursors. Corresponding gels were calcined at 1200 ℃ to form the cordierite structure. The nature of precursor was found to affect the pore volume distribution. Narrow pore volume distribution was observed when organic precursors were used. Another key factor to control the parameters of final material was the drying condition. Supercritical drying of the gels has allowed us to increase the surface area in two orders of magnitude comparing with conventional drying procedure.

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Section: Methodsmentioning

confidence: 99%

Synthesis of Al2O3–SiO2–MgO ceramics with hierarchical porous structure

Krivoshapkina

Vedyagin

2017

J Adv Ceram

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“…Because of its features, cordierite finds usage area as support for catalytic converter [15,16], filters [2], refractor coating on metals, integrated circuit board, electrical porcelains [7], heater element [4,8], electrical [8], thermal [2], and sound isolation, microwave and electromagnetic wave absorbent [4].…”

Section: Introduction mentioning

confidence: 99%

Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Parlak

Demirkıran

2018

J Adv Ceram

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In this study, natural zeolite was used as source of silica to produce cordierite. MgO and Al 2 O 3 were added to zeolite to obtain the cordierite stoichiometry. Mixture of these raw materials was mechanically activated for different durations. The mechanically activated powder mixture was characterized using XRD, DSC, SEM, specific surface area, and particle size analyzer. The pycnometer method was used to measure the densities of mechanically activated powder mixtures. Mechanically activated for 60 min powder mixture was sintered at 1150-1350 ℃ for 1 h. The sintering behavior of the samples was determined by measuring the linear shrinkage, density, and apparent porosity. The phases in the sintered samples were identified by XRD. Cordierite and spinel phases were detected for sintered at a temperature higher than 1150 ℃ but corundum accompanied to cordierite and spinel at 1150 ℃. The microstructure of the samples was examined using both SEM and AFM. The sintering behavior and microstructural properties of the samples changed with an increase in the sintering temperature. As the apparent porosity increased with increasing sintering temperature, linear shrinkage and density values decreased. Density values were determined as 2.31-2.69 g/cm 3 depending on the temperature. The grains coarsened at higher temperature and the average grain size depending on the temperature was 1.34-1.96 μm. From the results optimum sintering temperature was determined as 1250 ℃. Dense material was produced at a temperature as low as 1250 ℃ using zeolite as raw material.

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