Monolithic SCR (Selective Catalytic Reduction) honeycomb catalyst for processing diesel exhaust and preparation method of catalyst

Abstract

The invention discloses a monolithic SCR (Selective Catalytic Reduction) honeycomb catalyst for processing diesel exhaust and a preparation method of the catalyst. The catalyst comprises a honeycomb ceramic carrier and a coating; the coating coats a honeycomb hole, and the coating consists of a ZrO2 / TiO2 composite oxide carrier and catalyst active components. The ZrO2 / TiO2 composite oxide carrier comprises the following components in percentage by weight: 5wt%-20wt% of ZrO2 and 50wt%-85wt% of TiO2. The catalyst active components comprise the following components in percentage by weight: 1wt%-5wt% of V2O5, 1wt%-10wt% of WO, 1wt%-5wt% of Fe2O3, 1wt%-5wt% of CuO, 1wt%-10wt% of rare earth metal oxide and the balance of an adhesion agent. The preparation method of the catalyst comprises the following steps: firstly preparing the ZrO2 / TiO2 composite oxide carrier, subsequently preparing a vanadium-tungsten-zirconium-titanium powder catalyst, then dispersing the vanadium-tungsten-zirconium-titanium powder catalyst in other components to prepare a catalyst slurry; and then coating the honeycomb ceramic carrier with the catalyst slurry, drying and roasting, and then preparing the monolithic SCR honeycomb catalyst. The monolithic SCR honeycomb catalyst is suitable for purifying diesel exhaust NOx and has the characteristics of wide active temperature window at 160-550 DEG C, high NOx removal rate, strong antitoxic performance, long service life and simplicity in preparation.

Description

technical field

[0001] The invention belongs to the technical field of automobile tail gas purification and treatment, and relates to a catalyst, in particular to an integral SCR honeycomb catalyst for diesel vehicle tail gas treatment and a preparation method thereof. Background technique

[0002] As we all know, in recent years, with the rapid economic development, my country's automobile production and ownership have been showing a trend of rapid growth. The NOx emitted by motor vehicles (especially diesel vehicles) has brought great damage to the environment. Nitrogen oxides (NOx) are gases caused by acid rain and photochemical smog pollution. my country's NOx pollution is becoming more and more serious. The concentration of nitrogen oxides in the air of some large cities exceeds the standard. The environmental capacity of nitrogen oxides is basically in a saturated state, and photochemical smog even appears in some places.

[0003] my country is about to implement the ...

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