Characteristics of Porous Cordierite Traps Intentionally Contaminated with Calcium and Zinc

Agostini, Laura; Portu, Goffredo de; Guicciardi, Stefano; Borello, C.; Demaestri, P. P.; Giachello, A.

doi:10.1007/978-94-011-2882-7_130

Cited by 3 publications

(4 citation statements)

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“…Thermodynamic calculations were performed with a SolGasMix-based program. 19 By chemical analysis of the polymer (Si, C, H, and O) and variation of the content of aluminum and Al 2 O 3 , respectively, suitable polymer:filler ratios, with respect to stoichiometry, were calculated. These compositions were used to prepare samples by homogenizing the soluble polymer resin and powders by using a solvent (ethanol:acetone ratio of 95:5 vol%).…”

Section: Methodsmentioning

confidence: 99%

“…18 Monolithic silicates are used in catalysis; for example, cordierite serves as a carrier in automotive exhaust systems, because of its low thermal expansion coefficient. 19 This paper describes a new process for preparing synthetic silicates based on metal-oxide-or metal-filled polysiloxanes. Within the scope of this work, stoichiometric siloxane/Al 2 O 3 -derived (and siloxane/Al-derived) monolithic 3/2 mullite has been synthesized.…”

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confidence: 99%

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Formation of Mullite from Filled Siloxanes

Suttor

Kleebe

Ziegler

1997

Journal of the American Ceramic Society

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Monolithic mullite with low sintering shrinkage was synthesized from polymer/filler blends-that is, siloxane/ alumina (siloxane/Al 2 O 3 ) (and siloxane/aluminum (siloxane/Al)) mixtures. The synthesis was based on a reactionbonding process of amorphous silica, which formed when the siloxane was oxidized, with Al 2 O 3 (or oxidized aluminum filler) at temperatures >1250°C. Thermodynamic calculations were used to calculate the phase composition at equilibrium. Thermoanalytical, infrared-spectroscopic, and microscopic techniques were applied to reveal the microstructural evolution. The corresponding volume changes were used to evaluate the linear shrinkage, based on the quantitative phase assemblage.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Formation of Mullite from Filled Siloxanes

Suttor

Kleebe

Ziegler

1997

Journal of the American Ceramic Society

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“…Cordierite Mg 2 Al 4 Si 5 O 18 is a promising material for the production of Diesel Particulate Filters (DPF), in particular because of a low thermal expansion [1,2]. However, corrosion problems may occur: During use, DPF accumulate carbon soot and non-combustible particles (ash), which mainly consist of Ca, Mg, Zn, P and S originating from fuel or lubricating oil, as well as metals or metal oxides from wear of the engine or the exhaust gas system [3][4][5][6][7][8][9][10]. Soot is periodically burnt off in a so-called regeneration process.…”

Section: Introductionmentioning

confidence: 99%

“…At such temperatures, ash attack on Cordierite substrates may occur. Ash corrosion of Cordierite has been examined in numerous studies [3][4][5][6][14][15][16][17][18][19]. However, many studies concentrated on the interaction between single pure oxide compounds and Cordierite, while mixed compound ashes containing phosphate or sulfate compounds (as known to be main constituents of many real DPF ashes) were examined only in a limited number of studies [3,4,19].…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Single Crystal Cordierite by Model Diesel Particulate Filter Ashes: Mechanisms and Orientation Dependence

Maier

Nickel

Engel

et al. 2010

Advances in Science and Technology

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Cordierite Mg2Al4Si5O18 is a material for diesel particulate filters (DPF) with high potential. Its resistance to a simplified model ash has been tested on single crystals at temperatures up to 1050°C, which are realistic for use under ‘worst case’ conditions. A mixture of Ca, Mg and Zn phosphates, which are typical main constituents of many DPF ashes, was used as model ash. Single crystals were examined in order to investigate the orientation dependence of attack due to the strongly anisotropic nature of the Cordierite crystal lattice. Strong corrosion by the ash occurs at 1050 °C, connected to excessive ash melting. The molten ash attacks Cordierite by fast dissolution of the substrate with melt (super)saturation within minutes. Anisotropy of the dissolution process could not be detected. The initial kinetics are dominated by saturation effects, which slow down corrosion. The saturated melt attacks Cordierite by reaction processes leading to the formation of new crystalline phases. This process is much slower than the initial dissolution process but may significantly contribute to the destruction of Cordierite substrates if large contact areas between ash melt and Cordierite exist.

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