Honda Motor Co., Ltd.

Osami Yamamoto

Koichi Inaba

Hiroshi Ohno

Tetsuo Endo

Naohiro Sato

Hajime Uto

Yuichi Matsuo

Shinya Ishimaru

Naohiro Satoh

Chiaki Seki

Hiroki Hosoe

Hideaki Yoneda

Takuya Mito

Shumon Hoshino

Included are: a CO2 adsorberincluding a plurality of adsorption passagesallowing exhaust gas to flow through and an adsorbent, on its wall surface, capable of adsorbing and desorbing CO2 depending on a temperature, and a heat exchangerincluding a plurality of heat exchange passagesallowing the exhaust gas to flow through, being disposed in contact with the CO2 adsorber, and, when the exhaust gas flows through the heat exchange passages, transferring the heat to the CO2 adsorberfor heating it while removing the heat of the exhaust gas. The numbers of adsorption cellsand heat exchange cellsper unit area in a transverse section C are each set to a predetermined number and/or the sizes of the adsorption celland the heat exchange cellin the transverse section C are each set to a predetermined size.

CO2 separation apparatus for internal combustion engine

A fuel synthesis device includes: a supplier to supply COand Hgasses; a fuel synthesis catalyst to chemically react the COand Hgasses to synthesize fuel; a gas-liquid separator to liquefy the fuel into liquid and separate the liquid from a gas containing unreacted COand Hgasses, and CHgas as a side product; a return path to return the separated gas to a point between the supplier and the fuel synthesis catalyst; a bypass path to bypass, and merge downstream of, the return path, and to include a CHseparator to separate the CHand a CHoxidation catalyst to oxidize the CH; and a switching valve to selectively switch between communication with the return path and communication with the bypass path, wherein whether the switching valve communicates with the return path or bypass path is controlled based on the density of CH.

Fuel synthesis device

Disclosed is a NOx purifying catalyst which is capable of removing NOx sufficiently efficiently even during operations at low temperatures such as operations in diesel cars. Specifically disclosed is a NOx purifying catalyst for processing NOx in an exhaust gas by performing lean/rich control of air-fuel ratio of the exhaust gas. This NOx purifying catalyst comprises at least a first catalyst layer containing a &#x3b2; zeolite containing iron element and a second catalyst layer containing a noble metal, a cerium oxide material and a specific zirconium oxide material. The second catalyst layer and the first catalyst layer are sequentially arranged on a carrier in such a manner that the first catalyst layer forms the uppermost layer.

NOx purifying catalyst

Disclosed is a NOx purifying catalyst which is capable of removing NOx sufficiently efficiently even during operations at low temperatures such as operations in diesel cars. Specifically disclosed is a NOx purifying catalyst for processing NOx in an exhaust gas by performing lean/rich control of air/fuel ratio of the exhaust gas. This NOx purifying catalyst comprises at least a first catalyst layer containing a &#x3b2; zeolite containing iron element and a cerium oxide material and a second catalyst layer containing a noble metal, a cerium oxide material and a heat-resistant inorganic oxide. The second catalyst layer and the first catalyst layer are sequentially arranged on a carrier in such a manner that the first catalyst layer forms the uppermost layer.

A NOreduction system comprises NOtreatment catalyst and air-fuel ratio control switch for changing the air-fuel ratio of an exhaust gas to a lean or rich state. The NOtreatment catalyst comprises at least a first catalyst layer containing a solid acid catalyst capable of adsorbing ammonia and a second catalyst layer containing a noble metal and a cerium oxide material. The second and the first catalyst layer are stacked in that order on a carrier, and the first catalyst layer constitutes the uppermost layer. NOis passed through the first catalyst layer in the lean state and is temporarily stored in the second catalyst layer. Thereafter, in the rich state, NOis converted to NHand is restored in the first catalyst layer. When the state is again returned to the lean state, NHis converted to nitrogen which is finally released from the first catalyst layer.

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The present invention provides an NOx purifying catalyst that removes NOx with sufficient efficiency even under low temperature operation such as diesel engine automobiles. An NOx purifying catalyst for processing NOx in exhaust gas by rich/lean control of the air-fuel ratio of the exhaust gas, includes a first catalytic layer containing &#x3b2;-zeolite having iron and/or cerium elements, and a second catalytic layer including a noble metal and cerium oxide-based material; in which the second and the first catalytic layers are coated on a support in that order so that the first catalytic layer is the uppermost layer. The NOx purifying catalyst purifies NOx as showed in Reaction Formulations (1) to (4).Lean condition 1: NO+&#xbd;O&#x2192;NO&#x2003;&#x2003;(1)Rich condition: CO+HO&#x2192;CO&#x2003;&#x2003;(2)NO+H&#x2192;NH&#x2003;&#x2003;(3)Lean condition 2: NO+NH+O&#x2192;N+HO&#x2003;&#x2003;(4).

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Saitama, Japan

Osami Yamamoto