SCR catalyst

Patent metadata

Field	Value
Publication number	US-11027265-B2
Application number	US-201916705476-A
Country	US
Kind code	B2
Filing date	Dec 6, 2019
Priority date	Dec 3, 2013
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A copper-CHA zeolite catalyst for SCR of NOx is disclosed.

First claim

What is claimed is:

1. A one-pot synthesis method for making a catalyst composition comprising a zeolite having a CHA framework, a molar silica-to-alumina ratio (SAR) of 45 to 85, and an atomic copper-to-aluminium ratio of at least 1.25, which method comprising forming a reaction mixture containing a source of silica, a source of alumina, a first CHA framework organic templating agent in the form of a copper metal-amine, a second distinct organic CHA templating agent, and seed crystals; heating the reaction mixture to facilitate crystallization and precipitation of the crystals of the catalyst composition; and collecting, washing and drying the crystals.

2. The method of claim 1 , wherein the copper metal-amine is Cu-tetraethylenepentamine (Cu-TEPA) and the second distinct organic CHA templating agent is N,N,N-dimethylethylcyclohexylammonium (DMECHA).

3. The method of claim 1 , wherein the reaction mixture is free from fluorine.

Assignees

• Johnson Matthey Plc

Inventors

• Rivas-Cardona Alejandra
• Fedeyko Joseph Michael
• Chen Hai-Ying

Classifications

• Y02A50/20

  Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters · CPC title

• B01D2255/65

  Catalysts not containing noble metals · CPC title

• B01J2229/183

  in framework positions · CPC title

• B01D2258/012

  Diesel engines and lean burn gasoline engines · CPC title

• B01D2251/2062

  Ammonia · CPC title