Diesel engine exhaust particulate matter catalyst, preparation method and application method thereof

Abstract

The invention relates to a diesel engine tail gas particle catalyst, as well as a preparation method and a using method thereof. The catalyst consists of a catalyst carrier, a catalyst auxiliary and a catalyst active ingredient, wherein the catalyst auxiliary is loaded on the catalyst carrier; the catalyst carrier is gross-porosity microsphere silica gel with high mechanical strength; the catalyst auxiliary is metal oxide; the active ingredient is metal ruthenium. The preparation method of the catalyst comprises the following steps of: impregnating a precursor solution of metal oxide on the gross-porosity microsphere silica gel by adopting an equivalent-volume impregnation method, and baking at a certain temperature, thereby obtaining a composite-type carrier MOx / SiO2 (M refers to metal); impregnating a precursor of metal ruthenium with equal volume further on the composite carrier, and baking at a certain temperature, thereby obtaining a Ru / MOx / SiO2 catalyst. The using method of the catalyst is a fluidized bed catalytic method. Under the fluidized state, carbon oxide particles of the catalyst present highe activity and stability. The catalytic and oxidized diesel engine tail gas particles in the fluidized bed of the catalyst have lower oxidation temperature and higher CO2 selectivity.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation technology and novel reactor research and development, and specifically relates to the preparation of a composite carrier and the use of the composite carrier to load a noble metal catalyst, and the use of the catalyst in a novel fluidized bed reactor for catalytic reaction research. Background technique [0002] Due to its good economic performance, power performance and relatively good environmental performance, diesel engines tend to gradually replace gasoline engines as mainstream power equipment. However, the high particulate matter and nitrogen oxides emitted by its tail gas have become the main environmental factors restricting its development. The main components of diesel engine exhaust particulate matter are carbon particles, incompletely combusted organic matter and sulfate particles, of which the former two account for the vast majority of exhaust particulate matter. At p...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiency that the reactivity of the Pt catalyst decreases in the fluidized bed reactor. The present invention provides a catalyst that not only has higher catalytic activity than Pt, but also has , the activity of the noble metal catalyst is further improved, and the catalytic activity in the fluidized bed reactor is much higher than that in the fixed bed reactor

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