Abstract: 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 X0 and the total integrated intensity after heat endurance test for five hours at 900° C. under an air atmosphere is defined as X1, a ratio of X1 (X1/X0) to X0 is within a range from 0.2-0.7; and as measured by a 27Al-NMR method after the heat endurance test for five hours at 900° C. under the air atmosphere, when a peak intensity of tetra-coordinated Al atoms is defined as P4 and a peak intensity of hexa-coordinated Al atoms is defined as P6, a ratio of P6 (P6/P4) to P4 is 0.1 or less.

Abstract: 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 X0 and the total integrated intensity after heat endurance test for five hours at 900° C. under an air atmosphere is defined as X1, a ratio of X1 (X1/X0) to X0 is within a range from 0.2-0.7; and as measured by a 27Al-NMR method after the heat endurance test for five hours at 900° C. under the air atmosphere, when a peak intensity of tetra-coordinated Al atoms is defined as P4 and a peak intensity of hexa-coordinated Al atoms is defined as P6, a ratio of P6 (P6/P4) to P4 is 0.1 or less.

Abstract: A zeolite has a CHA structure, a SiO2/Al2O3 composition ratio less than 15, and potassium in an amount of about 0.1% by mass to about 1% by mass in terms of K2O.

Abstract: A zeolite has a CHA structure, a SiO2/Al2O3 composition ratio less than about 15, and an average particle size from about 0.1 ?m to about 0.5 ?m.

Abstract: An object of the invention is to provide composite particles that have excellent NOx purification performance and can suppress water adsorption-caused contraction and water desorption-caused expansion and to provide a honeycomb structure that has excellent NOx purification performance and can suppress the breakage of the honeycomb unit due to the adsorption or desorption of water, a method for manufacturing the honeycomb structure, and an exhaust gas purifying apparatus including the honeycomb structure. The composite particles of the invention are composite particles having a metallic oxide attached to silicoaluminophosphate particles with a ratio of an amount of Si to a sum of amounts of Al and P in a range of 0.16 to 0.33, in which a specific surface area is in a range of 250 m2/g to 450 m2/g, and an external surface area is in a range of 30 m2/g to 90 m2/g.

Abstract: Objects of the invention are to provide silicoaluminophosphate particles that have excellent NOx purification performance and can suppress water adsorption-caused contraction and water desorption-caused expansion and to provide a honeycomb structure that has excellent NOx purification performance and can suppress the breakage of the honeycomb unit due to the adsorption or desorption of water, a method for manufacturing the honeycomb structure, and an exhaust gas purifying apparatus including the honeycomb structure. The silicoaluminophosphate particles of the invention have a metallic oxide attached to silicoaluminophosphate particles with a ratio of an amount of Si to a sum of amounts of Al and P in a range of 0.16 to 0.33, in which a specific surface area is in a range of 250 m2/g to 450 m2/g, and an external surface area is in a range of 10 m2/g to 35 m2/g.

Abstract: A zeolite has a CHA structure, a SiO2/Al2O3 composition ratio less than 15, and potassium in an amount of about 0.1% by mass to about 1% by mass in terms of K2O.

Abstract: A zeolite has a CHA structure, a SiO2/Al2O3 composition ratio less than about 15, and an average particle size from about 0.1 ?m to about 0.5 ?m.

Abstract: In a method for manufacturing a zeolite, a raw material composition containing a Si source, an Al source, an alkali source, and a structure directing agent is reacted to synthesize the zeolite including a CHA-structured aluminosilicate. The Al source includes a dried aluminum hydroxide gel.

Abstract: A silico-alumino phosphate includes Si, Al, and P. A ratio of an amount of substance of Si to a sum of an amount of substance of Al and an amount of substance of P is approximately 0.22 or more and approximately 0.33 or less. An acid point is approximately 1.2 mmol/g or more. A honeycomb structural body includes a honeycomb unit. The honeycomb unit includes the silico-alumino phosphate and an inorganic binder. The honeycomb unit has a plurality of through-holes divided by a plurality of partition walls and arranged in a longitudinal direction of the honeycomb unit. An exhaust gas conversion apparatus includes the honeycomb structural body, a holding sealing member and a metal pipe. The holding sealing member is provided at an outer peripheral portion of the honeycomb structural body. The honeycomb structural body and the holding sealing member are installed in the metal pipe.

Abstract: Objects of the invention are to provide silicoaluminophosphate particles that have excellent NOx purification performance and can suppress water adsorption-caused contraction and water desorption-caused expansion and to provide a honeycomb structure that has excellent NOx purification performance and can suppress the breakage of the honeycomb unit due to the adsorption or desorption of water, a method for manufacturing the honeycomb structure, and an exhaust gas purifying apparatus including the honeycomb structure. The silicoaluminophosphate particles of the invention have a metallic oxide attached to silicoaluminophosphate particles with a ratio of an amount of Si to a sum of amounts of Al and P in a range of 0.16 to 0.33, in which a specific surface area is in a range of 250 m2/g to 450 m2/g, and an external surface area is in a range of 10 m2/g to 35 m2/g.

Abstract: An object of the invention is to provide composite particles that have excellent NOx purification performance and can suppress water adsorption-caused contraction and water desorption-caused expansion and to provide a honeycomb structure that has excellent NOx purification performance and can suppress the breakage of the honeycomb unit due to the adsorption or desorption of water, a method for manufacturing the honeycomb structure, and an exhaust gas purifying apparatus including the honeycomb structure. The composite particles of the invention are composite particles having a metallic oxide attached to silicoaluminophosphate particles with a ratio of an amount of Si to a sum of amounts of Al and P in a range of 0.16 to 0.33, in which a specific surface area is in a range of 250 m2/g to 450 m2/g, and an external surface area is in a range of 30 m2/g to 90 m2/g.

Abstract: A honeycomb structure of the invention includes a honeycomb unit provided with a plurality of through holes arrayed in a longitudinal direction with a partition wall therebetween, in which the honeycomb unit is produced by extruding and firing raw material paste containing silicoaluminophosphate particles and an inorganic binder, and the silicoaluminophosphate particles have a specific surface area in a range of 200 m2/g to 400 m2/g, and an acid point of 1.2 mmol/g or more.

Abstract: A silico-alumino phosphate includes Si, Al, and P. A ratio of an amount of substance of Si to a sum of an amount of substance of Al and an amount of substance of P is approximately 0.22 or more and approximately 0.33 or less. An acid point is approximately 1.2 mmol/g or more. A honeycomb structural body includes a honeycomb unit. The honeycomb unit includes the silico-alumino phosphate and an inorganic binder. The honeycomb unit has a plurality of through-holes divided by a plurality of partition walls and arranged in a longitudinal direction of the honeycomb unit. An exhaust gas conversion apparatus includes the honeycomb structural body, a holding sealing member and a metal pipe. The holding sealing member is provided at an outer peripheral portion of the honeycomb structural body. The honeycomb structural body and the holding sealing member are installed in the metal pipe.