Abstract: An object of the present invention is to provide an exhaust gas purification catalyst composition and an exhaust gas purification catalyst, each of which includes a pyrochlore-type CeO2—ZrO2-based complex oxide having an improved oxygen storage capacity (particularly, an improved oxygen storage capacity after being exposed to a high temperature environment), and, in order to achieve the above-mentioned object, the present invention provides an exhaust gas purification catalyst composition and an exhaust gas purification catalyst, each of which contains a pyrochlore-type CeO2—ZrO2-based complex oxide that contains Y and Mg and thus exhibits an excellent oxygen storage capacity (particularly, an excellent oxygen storage capacity after being exposed to a high temperature environment).

Abstract: An object of the present invention is to provide an exhaust gas purification catalyst composition and an exhaust gas purification catalyst, each of which includes a pyrochlore-type CeO2—ZrO2-based complex oxide having an improved oxygen storage capacity (particularly, an improved oxygen storage capacity after being exposed to a high temperature environment), and, in order to achieve the above-mentioned object, the present invention provides an exhaust gas purification catalyst composition and an exhaust gas purification catalyst, each of which contains a pyrochlore-type CeO2—ZrO2-based complex oxide that contains Y and Mg and thus exhibits an excellent oxygen storage capacity (particularly, an excellent oxygen storage capacity after being exposed to a high temperature environment).

Abstract: Provided is a porous structure for exhaust purification catalysts having excellent light-off temperature characteristics. The porous structure for exhaust purification catalysts includes an oxygen storage component and an inorganic porous solid. The porous structure has a pore volume distribution such that the ratio of the pore volume of pores with a diameter of from 15 nm to less than 25 nm to the pore volume of pores with a diameter of from 5 nm to less than 15 nm is 1.3 to 2.5 as measured with a mercury porosimeter. The pore volume distribution preferably has at least one peak top in a pore diameter range of from 15 nm to less than 25 nm.

Abstract: Provided is a porous structure for exhaust purification catalysts having excellent light-off temperature characteristics. The porous structure for exhaust purification catalysts includes an oxygen storage component and an inorganic porous solid. The porous structure has a pore volume distribution such that the ratio of the pore volume of pores with a diameter of from 15 nm to less than 25 nm to the pore volume of pores with a diameter of from 5 nm to less than 15 nm is 1.3 to 2.5 as measured with a mercury porosimeter. The pore volume distribution preferably has at least one peak top in a pore diameter range of from 15 nm to less than 25 nm.

Abstract: There is disclosed a honeycomb structure including a honeycomb structure body, and a pair of electrode members disposed on a side surface of the honeycomb structure body, an electric resistivity of the honeycomb structure body is from 1 to 200 ?cm, each of the pair of electrode members is formed into a band shape extending in a cell extending direction of the honeycomb structure body, and in a cross section orthogonal to the cell extending direction, one electrode member is disposed on a side opposite to the other electrode member via a center of the honeycomb structure body, and in the honeycomb structure body, one or more specific slits each having an open end in the side surface are formed.

Abstract: The honeycomb structure includes a honeycomb structure body and a pair of electrode members disposed on a side surface of the honeycomb structure body, each of the pair of electrode members is shaped in the form of a band extending in a cell extending direction, and in a cross section perpendicular to the extending direction of cells, one electrode member is disposed on a side opposite to the other electrode member via a center of the honeycomb structure body, one or more slits opened in the side surface are formed in the honeycomb structure body, the honeycomb structure body has a charging material charged into the at least one slit, the charging material contains aggregates and a neck material, and a ratio (?2/?1) of a thermal expansion coefficient ?2 of the charging material to a thermal expansion coefficient ?1 of the honeycomb structure body is from 0.6 to 1.5.

Abstract: A honeycomb structure including: a tubular honeycomb structure part having porous partition walls with which a plurality of cells are formed, and an outer peripheral wall; and a pair of electrode parts arranged on a side surface of the honeycomb structure part, an electrical resistivity of the honeycomb structure part is from 1 to 200 ?cm, each of the pair of electrode parts is formed into a band-like shape extending in a direction in which the cells extend, in a cross section perpendicular to the extending direction of the cells, the one electrode part is disposed opposite to the other electrode part via the center of the honeycomb structure part, and a total of heat capacities of the pair of electrode parts is from 2 to 150% of a heat capacity of the whole outer peripheral wall.

Abstract: A honeycomb structure including a tubular honeycomb structure portion having: porous partition walls with which a plurality of cells extending from one end surface to the other end surface are formed to partition through channels of a fluid; and an outer peripheral wall positioned on an outermost periphery, an electrical resistivity of the partition walls is from 1 to 200 ?cm, at least a part of the outer peripheral wall is formed by a low Young's modulus portion configured to have a Young's modulus lower than that of the partition walls, and a ratio of the Young's modulus of the low Young's modulus portion to the Young's modulus of the partition walls is from 2 to 95%. Provided is a honeycomb structure which is a catalyst carrier and also functions as a heater when a voltage is applied thereto and which has an excellent heat shock resistance.

Abstract: There is disclosed a honeycomb structure including a honeycomb structure body, and a pair of electrode members disposed on a side surface of the honeycomb structure body, an electric resistivity of the honeycomb structure body is from 1 to 200 ?cm, each of the pair of electrode members is formed into a band shape extending in a cell extending direction of the honeycomb structure body, and in a cross section orthogonal to the cell extending direction, one electrode member is disposed on a side opposite to the other electrode member via a center of the honeycomb structure body, and in the honeycomb structure body, one or more specific slits each having an open end in the side surface are formed.

Abstract: The honeycomb structure includes a honeycomb structure body and a pair of electrode members disposed on a side surface of the honeycomb structure body, each of the pair of electrode members is shaped in the form of a band extending in a cell extending direction, and in a cross section perpendicular to the extending direction of cells, one electrode member is disposed on a side opposite to the other electrode member via a center of the honeycomb structure body, one or more slits opened in the side surface are formed in the honeycomb structure body, the honeycomb structure body has a charging material charged into the at least one slit, the charging material contains aggregates and a neck material, and a ratio (?2/?1) of a thermal expansion coefficient ?2 of the charging material to a thermal expansion coefficient ?1 of the honeycomb structure body is from 0.6 to 1.5.

Abstract: There is disclosed a manufacturing method of a honeycomb structure including a formed honeycomb body preparing step of extruding a forming raw material containing a ceramic raw material and an organic binder, to prepare a formed honeycomb body having partition walls with which a plurality of cells are formed to define through channels of a fluid, and an outer peripheral wall; a dried honeycomb body preparing step of drying the formed honeycomb body; a honeycomb body with unfired electrodes preparing step of applying an electrode forming slurry containing a ceramic raw material and water to a side surface of the dried honeycomb body, and then maintaining the honeycomb body in a temperature range of 0 to 80° C. for three seconds to 48 hours to form the unfired electrodes; and a honeycomb structure preparing step of drying and firing the honeycomb body with the unfired electrodes.

Abstract: There is disclosed a honeycomb structure including: a tubular honeycomb structure part having porous partition walls with which a plurality of cells are formed, and an outer peripheral wall; and a pair of electrode parts arranged on a side surface of the honeycomb structure part, an electrical resistivity of the honeycomb structure part is from 1 to 200 ?cm, each of the pair of electrode parts is formed into a band-like shape extending in a direction in which the cells extend, in a cross section perpendicular to the extending direction of the cells, the one electrode part is disposed opposite to the other electrode part via the center of the honeycomb structure part, and a total of heat capacities of the pair of electrode parts is from 2 to 150% of a heat capacity of the whole outer peripheral wall.

Abstract: A honeycomb structure including a tubular honeycomb structure portion having: porous partition walls with which a plurality of cells extending from one end surface to the other end surface are formed to partition through channels of a fluid; and an outer peripheral wall positioned on an outermost periphery, an electrical resistivity of the partition walls is from 1 to 200 ?cm, at least a part of the outer peripheral wall is formed by a low Young's modulus portion configured to have a Young's modulus lower than that of the partition walls, and a ratio of the Young's modulus of the low Young's modulus portion to the Young's modulus of the partition walls is from 2 to 95%. Provided is a honeycomb structure which is a catalyst carrier and also functions as a heater when a voltage is applied thereto and which has an excellent heat shock resistance.