Honeycomb metal wire net carrier catalyst for catalytically reducing nitrogen oxide and preparing method thereof

Abstract

The invention relates to a honeycomb metal network carrier catalyst for catalyzing and reducing nitrogen oxide, and relative preparation, used in vehicle tail gas purification technique. The invention comprises metal carrier and catalyst, characterized in that the catalyst is load-type catalyst, the catalyst carrier is honeycomb metal network carrier carrying gamma-Al2O3 coat, referring coat mass, the content of TiO2 is 14.0-20.0wt% and the content of CeZrO is 3.0-6.0wt%, and referring to catalyst mass, the content of active component palladium is 0.1-1.0wt%, and the preparation comprises that preparing TiO2 gel, preparing TiO2 coat at the face of carrier, loading cerium zirconium oxide on carrier, leading in catalyst active component palladium. The invention has the advantages that the invention can improve mass transfer and heat transfer in catalyst, the catalyst has higher catalysis activity in low-temperature oxygen-abundant condition, wide active temperature window, simple preparation and low cost.

Description

technical field

[0001] The invention relates to a honeycomb wire mesh catalyst which is suitable for catalytic purification treatment of exhaust gas of lean-burn gasoline engines or diesel engines and uses metal palladium as an active component and a preparation method thereof, belonging to the technical field of catalytic purification of automobile tail gas. Background technique

[0002] Automobile exhaust has become the main source of air pollution, and the installation of catalytic converters is one of the most effective methods for the prevention and control of exhaust pollution. At present, the mainstream technology for automotive exhaust purification is to use a three-way catalytic converter. This purification technology requires the engine to work under stoichiometric ratio conditions, and can simultaneously purify carbon monoxide, unburned hydrocarbons and nitrogen oxides under the condition of controlling the air-fuel ratio. The main harmful and toxic substances in ...