Preparation and Characterization of Porous Cordierite Ceramics with Well-distributed Interconnected Pores

This paper aims at studying the porous cordierite ceramics prepared by using the non-stochiometric cordierite composition formulation (2.8MgO.1.5Al2O3.5SiO2) by PU sponge impregnated method. The ceramic suspension were prepared with non-stoichiometric formulation of cordierite and sintered at 1250 °C, 1275 °C, 1285 °C, 1300 °C and 1325 °C. The phase transformation of non-stochiometric formulation cordierite was investigated by XRD. This paper also aims to compare the effect of linear shrinkage, porosity and density of 20 wt.% PEG treated PU sponge with untreated PU sponge respectively corresponding to different pore content (100 ppi, 80 ppi, 60 ppi, and 40 ppi). The pore structure was analyzed by SEM.

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Near net size sintering of porous cordierite ceramics with excellent properties

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2020.154121 ◽

2020 ◽

Vol 826 ◽

pp. 154121

Author(s):

Hao Li ◽

Cuiwei Li ◽

Linghao Wu ◽

Han Wang ◽

Junwen Li ◽

...

Keyword(s):

Cordierite Ceramics ◽

Porous Cordierite

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In Situ DRIFTS Investigation on CeOx Catalyst Supported by Fly-Ash-Made Porous Cordierite Ceramics for Low-Temperature NH3-SCR of NOX

Catalysts ◽

10.3390/catal9060496 ◽

2019 ◽

Vol 9 (6) ◽

pp. 496 ◽

Cited By ~ 4

Author(s):

Shaoxin Wang ◽

Ziwei Chen ◽

Beini He ◽

Zheng Yan ◽

Hao Wang ◽

...

Keyword(s):

Fly Ash ◽

Low Temperature ◽

Photoelectron Spectroscopy ◽

Active Sites ◽

Supported Catalyst ◽

Nh3 Scr ◽

Scr Catalysts ◽

Cordierite Ceramics ◽

Porous Cordierite

A series of CeOx catalysts supported by commercial porous cordierite ceramics (CPCC) and synthesized porous cordierite ceramics (SPCC) from fly ash were prepared for selective catalytic reduction of NOx with ammonia (NH3-SCR). A greater than 90% NOx conversion rate was achieved by the SPCC supported catalyst at 250–300 °C when the concentration of loading precursor was 0.6 mol/L (denoted as 0.6Ce/SPCC), which is more advantageous than the CPCC supported ones. The EDS mapping results reveal the existence of evenly distributed impurities on the surface of SPCC, which hence might be able to provide more attachment sites for CeOx particles. Further measurements with temperature programmed reduction by hydrogen (H2-TPR) demonstrate more reducible species on the surface of 0.6Ce/SPCC, thus giving rise to better NH3-SCR performance at a low-temperature range. The X-ray photoelectron spectroscopy (XPS) analyses reveal that the Ce atom ratio is higher in 0.6Ce/SPCC, indicating that a higher concentration of catalytic active sites could be found on the surface of 0.6Ce/SPCC. The in situ diffused reflectance infrared fourier transform spectroscopy (DRIFTS) results indicate that the SCR reactions over 0.6Ce/SPCC follow both Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms. Hence, the SPCC might be a promising candidate to provide support for NH3-SCR catalysts, which also provide a valuable approach to recycling the fly ash.

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Enhancing strength of high-porous cordierite ceramics by mechanochemical activation of the charge

Russian Journal of Non-Ferrous Metals ◽

10.3103/s1067821207060168 ◽

2007 ◽

Vol 48 (6) ◽

pp. 456-460 ◽

Cited By ~ 4

Author(s):

V. N. Antsiferov ◽

S. E. Porozova

Keyword(s):

Mechanochemical Activation ◽

Cordierite Ceramics ◽

Porous Cordierite

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Hydroxyapatite/Biopolymers Composite Scaffolds for Bone Tissue Engineering

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.493-494.826 ◽

2011 ◽

Vol 493-494 ◽

pp. 826-831

Author(s):

A.C.B.M. Fook ◽

Thiago Bizerra Fideles ◽

R.C. Barbosa ◽

G.T.F.S. Furtado ◽

G.Y.H. Sampaio ◽

...

Keyword(s):

Tissue Engineering ◽

Bone Tissue Engineering ◽

Bone Tissue ◽

Freeze Drying ◽

Three Dimensional ◽

Porous Scaffolds ◽

X Ray Diffraction ◽

X Ray ◽

Interconnected Pores

The application of a hybrid composite consisting of biopolymer and calcium phosphate, similar morphology and properties of natural bone, may be a way to solve the problem of the fragility of ceramics without reducing its mechanical properties, retaining the properties of biocompatibility and high bioactivity. This work aims at the preparation and characterization of three-dimensional scaffolds composite HA / biopolymers (chitosan and gelatin). The freeze-drying technique was employed in this study to obtain these frameworks and partial results showed the effectiveness of this method. This involved the study of structural, chemical and morphological frameworks, in order to direct the research suggested the application. The X Ray Diffraction (XRD) and infrared spectroscopy and Fourier transform (FTIR) results confirmed the formation of hydroxyapatite (HA) phase and the presence of characteristic bands of HA and biopolymers in all compositions. The microstructure of the scaffolds study conducted by Scanning Electron Microscopy (SEM) revealed the formation of longitudinally oriented microchannels with interconnected pores. In all compositions the porous scaffolds showed varying sizes and mostly larger than 100μm, and is therefore considered materials with potential for application in bone tissue engineering.

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