Mitsui Minings & Melting Co., Ltd.

Jo Nishikawa

Satoshi Watanabe

Michitaka Yamaguchi

Makoto Dobashi

Hisao Sakai

Mitsuyoshi Matsuda

Junshi Yoshioka

Sakiko Tomonaga

Tomohiro Sakata

Takeo Taguchi

Hidekazu Goto

Mayuko Suwa

An exhaust gas purifying composition that contains a phosphorus-containing BEA-type zeolite and has further improved heat resistance; and a production method therefor are provided. The exhaust gas purifying composition contains a phosphorus-containing BEA-type zeolite, wherein the phosphorus-containing BEA-type zeolite has a pore volume ratio (V2/V1) of a micropore volume V2 having a pore diameter in a range of 2 nm or less, as measured by a SF method, to a mesopore volume V1 having a pore diameter in a range of 2 nm or more and 100 nm or less, as measured by a BJH method, of 2.0 or more.

Exhaust gas purifying composition and production method therefor

An exhaust gas purifying composition of the present invention contains zeolite that is BEA zeolite having an SiO/AlOmolar ratio of greater than 25 and 600 or less and containing phosphorus. Furthermore, the exhaust gas purifying composition preferably contains zirconium in addition to phosphorus. Furthermore, the zeolite has an SiO/AlOmolar ratio of from 30 to 150. The present invention provides an exhaust gas purifying composition having excellent HC adsorbability for exhaust gas purification in internal combustion engines such as gasoline engines.

Exhaust gas-purifying composition

The present invention provides an exhaust gas purifying composition containing BEA zeolite containing phosphorus, wherein an amount of phosphorus is such that a molar ratio thereof with respect to Al in the zeolite is 0.5 or greater, and a maintaining factor Rof a specific surface area of the exhaust gas purifying composition after heating at 980&#xb0; C. for 25 hours is 35% or greater. Furthermore, the present invention also provides an exhaust gas purifying composition containing phosphorus-containing zeolite, wherein an amount of phosphorus is such that a molar ratio thereof with respect to Al in the zeolite is from 0.5 to 8, and a maintaining factor Rof a crystallite diameter after heating at 980&#xb0; C. for 25 hours is 50% or greater. The exhaust gas purifying composition of the present invention has excellent HC purifiability for exhaust gas purification in internal combustion engines such as gasoline engines.

It is an object to provide a surface-treated electro-deposited copper foil which has a low profile at a level equal to or excellent than that of low-profile surface-treated electro-deposited copper foils that have conventionally been supplied to the market and in which waviness affecting the straight line performance of wiring is small, and a method for manufacturing the same. In order to achieve this object, in the surface-treated electro-deposited copper foil, the maximum waviness height (Wmax) of the bonding surface to be bonded with an insulation layer-constituting material to be 0.05 &#x3bc;m to 0.7 &#x3bc;m, the maximum peak to valley height (PV) to be 0.05 to 1.5 &#x3bc;m, and the surface roughness (Rzjis) to be 0.1 &#x3bc;m to 1.0 &#x3bc;m. The electro-deposited copper foil used for the manufacturing of this surface-treated electro-deposited copper foil is manufactured by using a sulfuric acid base copper electrolytic solution obtained by adding 3-mercapto-1-propanesulfonic acid or bis(3-sulfopropyl)disulfide, a quaternary ammonium salt polymer having a cyclic structure, and chlorine, and using a cathode having small surface roughness, under electrolysis conditions of carrying out continuous first-step electrolysis to n-th-step electrolysis at two or more different levels of electric current density.

Surface-treated electro-deposited copper foil and method for manufacturing the same

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Saitama, Japan

Jo Nishikawa