Alkali resistance of tape-cast SiC porous ceramic membranes

Passalacqua, E.; Freni, S.; Barone, F.

doi:10.1016/s0167-577x(97)00176-6

Cited by 48 publications

(25 citation statements)

References 7 publications

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“…Hence, these types of ceramics are finding many applications including the filtration of molten metals, filtration of particles from diesel engine exhaust gases, filtration of hot corrosive gases in various industrial applications, gas-burner media, membrane supports for hydrogen separation and light-weight structural components for high temperature applications. [1][2][3][4][5][6] Since the open and closed porosity, pore size distribution and pore morphology in porous ceramics is related directly to their ability to perform a desired function in a particular application, there is a need to control these characteristics in order to achieve these superior properties. [7][8][9] All these characteristics are in turn strongly influenced by the processing route and templates used for producing porous ceramics.…”

Section: Introductionmentioning

confidence: 99%

Processing and properties of polysiloxane-derived porous silicon carbide ceramics using hollow microspheres as templates

Eom¹,

Kim²,

Song³

et al. 2008

Journal of the European Ceramic Society

135

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Section: Introductionmentioning

confidence: 99%

Processing and properties of polysiloxane-derived porous silicon carbide ceramics using hollow microspheres as templates

Eom¹,

Kim²,

Song³

et al. 2008

Journal of the European Ceramic Society

135

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“…A protective shield was inserted between the anode and the catalysts to protect the catalysts from alkali attack. This shield which was pervious only to hydrogen and not to alkali was made of a porous plate, foil, ceramic and membrane [15][16][17][18]. A third attempt began recently in the 2000s, and was directed at finding new optimum operating conditions of the DIR-MCFC in order to reduce alkali poisoning as much as possible.…”

Section: Reaction At Dir-mcfcmentioning

confidence: 99%

Carbon deposition and alkali poisoning at each point of the reforming catalysts in DIR-MCFC

Wee

Lee

2005

J Appl Electrochem

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The extent of local carbon deposition and alkali poisoning of the reforming catalysts in a unit cell (5 Â 5 cm) of a direct internal reforming molten carbonate fuel cell was examined. The catalysts in the catalyst bed were sampled from 25 points individually after the unit cell had been operated for both 24 and 100 h, and the amount of carbon, alkali poisoning were then analyzed. There was little difference in the amount of carbon deposition and alkali poisoning with respect to the direction of the cathode gas. They were only dependent on the direction of the anode gas. After 24 h, the amount of carbon deposited on the catalysts loaded in the front region, and the extent of alkali poisoning in the catalysts loaded in the rear region were relatively higher than those of any other regions. After 100 h, the amount of carbon deposition in the catalysts loaded in the front region was still the highest and the amount of alkali poisoning increased rapidly. Meanwhile, relatively low carbon deposition rate and the small increase in alkali poisoning were observed in the catalysts loaded in the rear region. Therefore, the rate of alkali poisoning of the catalyst in the rear region was much slower than those in any other region. These results for catalyst poisoning were explained by a simulation of the unit cell, which was performed to determine the temperature profiles and the extent of the reaction at each point of the unit cell. The simulation showed that the catalysts in the front region treated 90 mol% of the initial methane flow, and the temperature was the lowest at this region. Therefore, the catalysts in this region had the highest level of carbon deposition and the rate of alkali poisoning was faster than that of the catalysts in the other regions. This simulation also explained the reasons for the relatively low level of carbon deposition in the rear region, as well as the relatively high rate of alkali poisoning from the start and the low rate of alkali poisoning in the rear region.

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“…Silicon carbide (SiC) is widely used for high temperature structural application. Protective coatings to refractory metals and superalloys for operation in several environments are results of its excellent hardness, scratch resistance and chemical durability [5][6][7][8]. It is common in gas turbine blades, seals, turbocharger rotors, chemical processing pressure vessels, heat exchanger, steam generators, machine guns etc.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and tribological properties of silicon carbide coating on Inconel alloy from liquid pre-ceramic precursor

Mukherjee

Chakraborty

Chakravarty

et al. 2014

Ceramics International

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Alkali resistance of tape-cast SiC porous ceramic membranes

Cited by 48 publications

References 7 publications

Processing and properties of polysiloxane-derived porous silicon carbide ceramics using hollow microspheres as templates

Processing and properties of polysiloxane-derived porous silicon carbide ceramics using hollow microspheres as templates

Carbon deposition and alkali poisoning at each point of the reforming catalysts in DIR-MCFC

Mechanical and tribological properties of silicon carbide coating on Inconel alloy from liquid pre-ceramic precursor

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