Ibiden Company Limited

Toyohiro Usui

Takunari Murakami

Satoshi Shimada

Tatsuhiro Higuchi

Hirokazu Igarashi

The honeycomb filter of the present invention includes a honeycomb fired body that includes multiple cells serving as channels of exhaust gas; and porous cell partition walls defining the cells, the cells including exhaust gas introduction cells whose ends on an exhaust gas inlet side are open and whose ends on an exhaust gas outlet side are plugged, and exhaust gas emission cells whose ends on the exhaust gas outlet side are open and whose ends on the exhaust gas inlet side are plugged, wherein the honeycomb fired body contains ceria-zirconia composite oxide particles and alumina particles, when the pore size of the cell partition walls of the honeycomb fired body is measured by mercury porosimetry, and the measurement results are presented as a pore size distribution curve with pore size (&#x3bc;m) on the horizontal axis and log differential pore volume (mL/g) on the vertical axis, the volume of micropores having a pore size of 1 to 100 &#x3bc;m accounts for 80 vol % or more of the total pore volume, and a value obtained by dividing the half width (&#x3bc;m) of the maximum peak in the pore size range of 1 to 100 &#x3bc;m by the mode size (&#x3bc;m) is 0.5 or less.

Honeycomb filter and method for manufacturing honeycomb filters

There is provided a zeolite having a CHA structure. When a total integrated intensity of a (211) plane, a (104) plane, and a (220) plane in an X-ray diffraction spectrum obtained by an X-ray powder diffraction method is defined as Xand the total integrated intensity after heat endurance test for five hours at 900&#xb0; C. under an air atmosphere is defined as X, a ratio of X(X/X) to Xis within a range from 0.2-0.7; and as measured by aAl-NMR method after the heat endurance test for five hours at 900&#xb0; C. under the air atmosphere, when a peak intensity of tetra-coordinated Al atoms is defined as Pand a peak intensity of hexa-coordinated Al atoms is defined as P, a ratio of P(P/P) to Pis 0.1 or less.

Zeolite, method for producing zeolite, honeycomb catalyst using zeolite, and exhaust gas purifying apparatus

There is provided a method for producing zeolite having a CHA structure in which Cu is carried, the method enabling an increase in ion exchange efficiency of Cu, effective utilization of Cu, and reduction in production cost. The method for producing the zeolite having the CHA structure in which Cu is carried includes a mixing step of mixing a powder of the zeolite having the CHA structure and a powder of Cu salt with each other and a heating step of heating the obtained powder mixture.

Method of producing zeolite

There is provided a zeolite which has excellent NOx purifying performance, particularly excellent NOx purifying performance after heat endurance. The zeolite has a CHA structure in which Cu and Ce are carried, and has a Cu/Al molar ratio of 0.25 to 0.48 and a Ce/Al molar ratio of 0.01 to 0.03.

A zeolite has a CHA structure, a SiO/AlOcomposition ratio less than 15, and potassium in an amount of about 0.1% by mass to about 1% by mass in terms of KO.

Zeolite, method for manufacturing zeolite, honeycomb catalyst, and exhaust gas purifying apparatus

A zeolite has a CHA structure, a SiO/AlOcomposition ratio less than about 15, and an average particle size from about 0.1 &#x3bc;m to about 0.5 &#x3bc;m.

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Gifu, Japan

Toyohiro Usui