A Review of Advanced Mullite Ceramics

Roy, Romit; Das, Dipankar; Rout, Prasanta Kumar

doi:10.30919/es8d582

Cited by 21 publications

(14 citation statements)

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“…12,23 It is reported that the strength of mullite is affected by quartz or glass in grain boundaries. 16 The XRD results indicated that the WTS was amorphous in nature and had quartz and other impurity content. An increase in the WTS content introduced more glassy/quartz phases, which affected the strength of the mullite bricks.…”

Section: Influence Of Composition On the Properties Of Refractory Bricksmentioning

confidence: 99%

“…For instance, mullite refractories are widely used as furnace lining material and kiln slabs due to their high refractoriness under load, low thermal expansion coefficient, and excellent thermal shock resistance. 15,16 Again, researchers have attracted much attention to porous mullite refractories used as insulators in industrial furnaces owing to the excellent combination of low density and low thermal conductivity. 17 The chemical makeup suggests that WTS can be mixed with kaolinitic clay to enhance mullitization through liquid phase formation.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the chemical makeup of WTS, it is possible to produce mullite refractories with a good combination of properties for varied applications by carefully selecting a kaolinitic clay source. For instance, mullite refractories are widely used as furnace lining material and kiln slabs due to their high refractoriness under load, low thermal expansion coefficient, and excellent thermal shock resistance 15,16 . Again, researchers have attracted much attention to porous mullite refractories used as insulators in industrial furnaces owing to the excellent combination of low density and low thermal conductivity 17 .…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of porous mullite‐based ceramic bricks from Al‐rich water treatment sludge and kaolinitic‐based clay

Darkwa

Andrews

Darko

et al. 2023

Int J Applied Ceramic Tech

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A large quantity of water treatment sludge (WTS) is generated yearly from Ghana's Weija water treatment plant. The sludge contains some heavy metals and other toxic chemicals, which must be managed to minimize environmental impact. In the current work, WTS was mixed with varying quantities of kaolinitic-based clays (kaolin and lithomargic clays) to produce porous mullitebased bricks. The bricks were fired at 1200 • C for 1 h, and their properties were determined. Lithomargic clay-based mixtures had less dimensional variation and were suitable to produce near-net shape bricks compared to WTS-based bricks. The addition of WTS increased the linear firing shrinkage and apparent porosity whilst decreasing bulk density and compressive strength. Porous mullite-based bricks fabricated from lithomargic clay exhibited high compressive strength (6.3 MPa) at 10 wt.% WTS addition. The highest apparent porosity of 27% was attained at 40 wt.% WTS addition with compressive strength of 5.1 MPa and thermal conductivity of .5 W/m K.

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Section: Influence Of Composition On the Properties Of Refractory Bricksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of porous mullite‐based ceramic bricks from Al‐rich water treatment sludge and kaolinitic‐based clay

Darkwa

Andrews

Darko

et al. 2023

Int J Applied Ceramic Tech

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“…Mullite phase (3Al 2 O 3 •2SiO 2 ) is the only stable intermediate phase in a Al 2 O 3 -SiO 2 system under normal pressure, and it rarely exists in nature [1][2][3][4]. Since mullite has excellent creep resistance [3,5], high-temperature stability [2,6], and other excellent properties, it has been used to fabricate advanced structural and functional ceramics, and porous ceramics have also received extensive attention due to the unique properties provided by the presence of porosity [7]. Porous mullite has been used in catalyst carriers [8], filters [9], refractory materials [10], and other fields.…”

Section: Introduction mentioning

confidence: 99%

Open-cell mullite ceramic foams derived from porous geopolymer precursors with tailored porosity

Shao¹,

Bai²,

Li³

et al. 2023

Journal of Advanced Ceramics

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Porous geopolymer precursors were firstly prepared by the direct foaming method using bauxite, fly ash (FA), and metakaolin (MK) as raw materials, and porous mullite ceramics were prepared after ammonium ion exchange and then high-temperature sintering. The effects of chemical foaming agent concentration, ion-exchange time, and sintering temperature on porous geopolymerderived mullite ceramics were studied, and the optimal preparation parameters were found. Studies have shown that the concentration of blowing agent had great influence on open porosity (q) and porosity and cell size distributions of geopolymer samples, which in turn affected their compressive strength (σ). Duration of the ion exchange had no obvious effect on the sintered samples, and the amount of mullite phase increased with the increase in the sintering temperature. Mullite foams, possessing an open-celled porous structure, closely resembling that of the starting porous geopolymers produced by directly foaming, were obtained by firing at high temperatures. Stable mullite (3Al 2 O 3 •2SiO 2 ) ceramic foams with total porosity (ε) of 83.52 vol%, high open porosity of 83.23 vol%, and compressive strength of 1.72 MPa were produced after sintering at 1400 for 2 h in ℃ air without adding any sintering additives using commercial MK, bauxite, and FA as raw materials.

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“…Represented by cordierite honeycomb ceramics (CHC), porous ceramic materials have emerged as a promising candidate for applications in filtration and separation, catalyst substrates and pollution prevention/control. [13][14][15] It is also a secondary support of monolithic catalysts commonly used in practical VOCs emissions to facilitate the mass transfer and reaction processes. Though offering advantages such as resistance to high temperature, chemical corrosion and excellent porosity, there still remains concerns on homogeneity, reliability and durability of coating catalytic © Engineered Science Publisher LLC 2022 components, hindering its further large-scale applications.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of Pt Nanoclusters Supported Cordierite for Enhanced Catalytic Oxidation of Toluene

Du¹,

Chaoliang²,

Wang³

et al. 2022

Eng. Sci.

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Developing a low cost and high efficiency synthetic pathway is essential for the large-scale application of supported noble metal catalysts in many important environmental catalytic reactions, especially for volatile organic compounds (VOCs) catalytic oxidation. In this study, we report a facile chemical wet ball-milling method to control the metal-support interactions and platinum (Pt) nanoclusters (1.12 ± 0.23 nm) supported cordierite honeycomb ceramic (CHC) catalysts with enhanced toluene oxidation performance is obtained. The optimized Pt/CHC catalyst with Pt loading as low as 1.0 wt.% could convert 90% toluene (1000 ppm) to CO 2 at about 160 °C under a space velocity of 40000 mL g −1 h −1 . The catalyst also exhibits a low apparent activation energy of 44.1 kJ mol -1 , high stability for more than 60 h and moisture resistance properties under reaction condition. It is concluded that the high adsorbed oxygen species concentration, better low-temperature reducibility, and synergistic effect between Pt nanoclusters and CHC support is responsible for enhanced catalytic performance. Furthermore, the present wet ball-milling synthetic strategy paves a new avenue for mass production of highly efficient supported noble metal catalysts for environmental applications.

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A Review of Advanced Mullite Ceramics

Cited by 21 publications

References 0 publications

Fabrication of porous mullite‐based ceramic bricks from Al‐rich water treatment sludge and kaolinitic‐based clay

Fabrication of porous mullite‐based ceramic bricks from Al‐rich water treatment sludge and kaolinitic‐based clay

Open-cell mullite ceramic foams derived from porous geopolymer precursors with tailored porosity

Mechanochemical Synthesis of Pt Nanoclusters Supported Cordierite for Enhanced Catalytic Oxidation of Toluene

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