The catalytically-active materials and catalytic converter of selective catalytic reduction for nitrogen oxides

The catalytically-active materials and catalytic converter of selective catalytic reduction for nitrogen oxides

  • CN 103,402,634 B
  • Filed: 03/01/2012
  • Issued: 10/26/2018
  • Est. Priority Date: 03/03/2011
  • Status: Active Grant
First Claim
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1. a kind of catalysis of selective catalytic reduction with reducing agent ammonia for the nitrogen oxides in diesel engine exhaustThere is active material the tolerance significantly improved to hydro carbons, the material to surround this core by the core (1) of an inside and oneShell (2) forms, and wherein the core is a kind of zeolite by having used one or more transition metal in addition to nickel and chromium to exchangeOr one type zeolite compound formed, and wherein the shell is formed by one or more oxides, these oxidesIt is selected from the group, which is made of the following terms:

  • Silica, germanium dioxide, aluminium oxide, titanium oxide, tin oxide, cerium oxide, twoZirconium oxide and their mixed oxide, wherein in addition to nickel and chromium one or more transition metal exchange it is meant thatFrom the H-shaped formula or NH of corresponding zeolite or class zeolite compound4+Form is set out, H+Ion or NH4+Ion by ion exchangeThrough being exchanged into the transition-metal cation of corresponding equivalent, and since ion exchange is not as a result, basic lattice holding changesBecome;

    Wherein, these zeolites or class zeolite compound have maximum gauge big before by the modification with transition metal exchangeInHole, and the d of the size distribution of the oxide in the shell50It is equal to or is less than 100nm, the grain of the oxideSpend the d of distribution50It is understood to so that 50% of the total volume of the oxide is less than or equal to comprising diameter and is reported as d50ValueThose of particle.

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