摘要:
The invention relates to a catalyst comprising: a) a catalyst support made of a ceramic, the support comprising an arrangement of crystallites having the same size, the same isodiametric morphology and the same chemical composition or substantially the same size, the same isodiametric morphology and the same chemical composition, in which each crystallite makes point contact or almost point contact with the surrounding crystallites; and b) at least one active phase comprising metallic particles that interact chemically with said catalyst support made of a ceramic and that are mechanically anchored to said catalyst support in such a way that the coalescence and mobility of each particle are limited to a maximum volume corresponding to that of a crystallite of said catalyst support.
摘要:
Catalyst comprising: a) a catalytic ceramic support comprising an arrangement of crystallites of the same size, same isodiametric morphology and same chemical composition or substantially of the same size, same isodiametric morphology and same chemical composition in which each crystallite is in point contact or virtually point contact with crystallites that surround it, and b) at least one active phase comprising metallic particles mechanically anchored into said catalytic support so that the coalescence and the mobility of each particle are limited to a volume corresponding to that of a crystallite of said catalytic ceramic support.
摘要:
The invention relates to a device for the purification of exhaust gases from a heat engine, including: one or more ceramic catalyst carriers comprising an arrangement of crystallites having the same size, the same isodiametric morphology and the same chemical composition or essentially the same size, the same isodiametric morphology and the same chemical composition, in which each crystallite is in point contact or almost in point contact with the surrounding crystallites; and one or more active phases for the chemical destruction of impurities in the exhaust gas, comprising metal particles that interact chemically with the ceramic catalyst carrier and are mechanically anchored in said catalyst carrier, such that the coalescence and mobility of each particle are limited to a maximum volume corresponding to that of a crystallite of the ceramic catalyst carrier.
摘要:
The invention relates to a device for purifying exhaust gases from a heat engine, comprising a catalytic ceramic support comprising an arrangement of crystallites of the same size, same isodiametric morphology and same chemical composition or essentially the same size, same isodiametric morphology and same chemical composition, wherein each crystallite is in contact at certain points, or almost in contact at certain points, with surrounding crystallites, and whereon at least one active phase is deposited for the chemical destruction of impurities present in the exhaust gas.
摘要:
The invention relates to a device for the purification of exhaust gases from a heat engine, including: one or more ceramic catalyst carriers comprising an arrangement of crystallites having the same size, the same isodiametric morphology and the same chemical composition or essentially the same size, the same isodiametric morphology and the same chemical composition, in which each crystallite is in point contact or almost in point contact with the surrounding crystallites; and one or more active phases for the chemical destruction of impurities in the exhaust gas, comprising metal particles that are mechanically anchored in the catalyst carrier, such that the coalescence and mobility of each particle are limited to a maximum volume corresponding to that of a crystallite of the ceramic catalyst carrier.
摘要:
The invention relates to a catalyst support made of a ceramic, the support comprising an arrangement of crystallites having the same size, the same isodiametric morphology and the same chemical composition or substantially the same size, the same isodiametric morphology and the same chemical composition, in which each crystallite makes point contact or almost point contact with the surrounding crystallites.
摘要:
A building brick having a honeycomb structure comprising a porous material, said porous material being obtained by a method comprising the following successive steps: a step a) of preparing quicklime; a step b) of mixing said quicklime, water and silica; a step c) of adding a nucleating agent; a step d) of hydrothermal synthesis to obtain a ceramic mass, and a step e) of drying said ceramic mass obtained in step d).
摘要:
The invention relates to an oxy-acetylene work apparatus comprising a first acetylene container (1), a first pressure gauge (2), a first pressure indicator (4) and a first two-dimensional marking (5), said first pressure indicator (4) being capable of adopting a plurality of angular positions relative to said first marking (5); a second oxygen container (21), a second pressure gauge (22) comprising a second pressure indicator (24) and a second two-dimensional marking (25), said second pressure indicator (24) being capable of adopting a plurality of angular positions relative to said second marking (25); a device for collecting images (7) of the first and second pressure gauges (1, 2); and an electronic logic circuit (8) configured to process said images of the first and second pressure gauges (1, 2) so as to determine the pressure values measured by the first and second pressure gauges (2, 22). According to the invention, the apparatus also comprises a sensor (6) of the temperature of the first container (1) and the electronic logic circuit (8) is configured to determine, in accordance with a predetermined initial amount of acetylene, the value of the temperature measured by the sensor (6) and the value of the pressure measured by the first pressure gauge (2), the residual amount of acetylene in the first container (1), and to determine, in accordance with a predetermined initial amount of oxygen and the value of the pressure measured by the second pressure gauge (22), the residual amount of oxygen in the second container (21).