摘要:
An exhaust system for an internal combustion engine, the exhaust system comprising, a lean NOx trap, and a wall flow monolithic substrate having a pre-coated porosity of 40% or greater, and comprising an oxidation catalytic zone, the oxidation catalytic zone comprising a platinum group metal loaded on a first support, the first support comprising at least one inorganic oxide and a zinc compound.
摘要:
A process is provided for the isomerization of aromatic hydrocarbons including contacting an aromatic hydrocarbon feedstream with a catalyst comprising a hydrogenation metal wherein sulfur is continuously introduced after catalyst start-up for an extended period of time at a concentration of no more than 56 ppm by weight of the aromatic hydrocarbon feedstream.
摘要:
The invention relates to a process for preparing a hydroconversion catalyst based on a modified zeolite of the FAU framework type with preserved crystallinity and microporosity, comprising the steps of: A—preparation of a modified zeolite of the FAU framework type, whose intracrystalline structure presents at least one network of micropores, at least one network of small mesopores with a mean diameter of 2 to 5 nm and at least one network of large mesopores with a mean diameter of 10 to 50 nm; these various networks being interconnected; B—mixing the zeolite with a binder, shaping the mixture, and then calcining; C—impregnation of the shaped zeolite with at least one compound of a catalytic metal chosen from compounds of a metal from group VIII and/or from group VIB, in acidic medium, provided that at least one compound of a catalytic metal is soluble within said acidic medium and that the acid acts as a complexing or chelating agent for at least one compound of a catalytic metal. The invention also relates to a catalyst obtained via this process and also to the use thereof.
摘要:
An exhaust gas oxidation catalyst characterised as an exhaust gas oxidation catalyst comprising a catalyst substrate, wherein a plurality of exhaust gas channels has been formed, and a catalyst layer formed on the surface of the exhaust gas channels in the catalyst substrate; wherein a catalyst layer consisting of a bottom catalyst layer, a top catalyst layer exposed within the exhaust gas channels, and an intermediate catalyst layer located between the bottom catalyst layer and top catalyst layer, is provided so as to cover not less than 25% of the exhaust gas channel surface, and wherein the bottom catalyst layer contains at least an oxygen-occluding agent as catalyst component but does not contain a hydrocarbon adsorbent, the intermediate catalyst layer contains at least catalyst metal, supported on a metal oxide support, and a hydrocarbon adsorbent as catalyst components, and the top catalyst layer contains at least an oxygen-occluding agent and a hydrocarbon adsorbent as catalyst components.
摘要:
A catalyst effective in hydrotreating and hydrocracking sulfur- and nitrogen-containing hydrocarbon feeds at low pressure. The catalyst is prepared by incorporating a platinum group metal such as palladium in ZSM-20 or in dealuminized zeolite Y. Unlike most palladium catalyst, this catalyst is not poisoned by nitrogen and sulfur in the feed.
摘要:
1. IN AN ALKYLATION PROCESS IN WHICH AN ALKYLATABLE ORGANIC COMPOUND IS CONTACTED AND REACTED WITH AN ALKYLATION AGENT IN A CATALYTIC CONVERSION ZONE CONTAINING A CATALYST COMPOSITION COMPRISING AT LEAST ONE HYDROGENATION AGENT OF THE GROUP OF NICKEL, PLATINUM, PALLADIUM, RUTHENIUM AND RHODIUM AND THREE-DIMENSIONAL CRYSTALLINE ZEOLITIC MOLECULAR SIEVE HAVING A PORE DIAMETER LARGE ENOUGH TO ADSORB ORTHO-DIETHYLBENZENE, AN ALKALI METAL CONTENT OF LESS THAN 3.5 WEIGHT PERCENT ON A SOLIDS BASIS, AN SIO2/AL2O/3 MOLAR RATIO OF AT LEAST 7.0. SAID CONTACT AND REACTION BEING CONTINUED UNTIL THE ALKYLATION ACTIVITY OF THE CATALYST HAS DECREASED, THE IMPROVEMENT WHICH COMPRISES PERIDICALLY CONTACTING A DHYDROGENATING THE CATALYST COMPOSITION AT A TEMPERATURE OF FROM 80*F. TO 572*F. WITH A LIQUID SOLUTION OF HYDROGEN IN A SATURATED HYDROCARBON HAVING FROM 4 TO 12 CARBON ATOMS, SAID SOLUTION CONTAINING AT LEAST 0.1 MOLE PERCENT DISSOLVED HYDROGEN, UNTIL THE ALKYLATION ACTIVITY OF THE CATALYST IS IMPROVED.
摘要:
To provide a functional structural body that can realize a long life time by suppressing the decline in function of the functional substance and that can attempt to save resources without requiring a complicated replacement operation, and to provide a method for making the functional structural body. The functional structural body (1) includes a skeletal body (10) of a porous structure composed of a zeolite-type compound, and at least one functional substance (20) present in the skeletal body (10), the skeletal body (10) has channels (11) connecting with each other, and the functional substance is present at least in the channels (11) of the skeletal body (10).
摘要:
To provide a functional structural body that can realize ong life time by suppressing the decline in function of the functional substance and that can attempt to save resources without requiring a complicated replacement operation, and to provide a method for making the functional structural body. The functional structural body (1) includes a skeletal body (10) of a porous structure composed of a zeolite-type compound, and at least one functional substance (20) present in the skeletal body (10), the skeletal body (10) has channels (11) connecting with each other, and the functional substance is present at least the channels (11) of the skeletal body (10).
摘要:
A functional structural body includes a skeletal body of a porous structure composed of a zeolite-type compound, and at least one type of metallic nanoparticles present in the skeletal body, the skeletal body having channels connecting with each other, the metallic nanoparticles being present at least in the channels of the skeletal body.