# US 8,465,713 B2 · Catalyst composition for selective catalytic reduction of exhaust gases

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- Number: US 8,465,713 B2
- Document ID: US8465713B2
- Status: Granted
- Kind: B2
- Application number: 13/002,900
- Filed: 2010-04-16
- Published: 2011-06-23
- Granted: 2013-06-18
- Earliest claimed: 2009-04-23
- Assignees: Treibacher Industrie AG
- Applicants: Karl Schermanz; Amod Sagar; Alessandro Trovarelli; Marzia Casanova
- Inventors: Karl Schermanz; Amod Sagar; Alessandro Trovarelli; Marzia Casanova
- Web page: https://patentgrep.com/patent/US8465713B2

## CPC

- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01J 23/002: {Mixed oxides other than spinels, e.g. perovskite}
- B01J 23/8472: {Vanadium}
- B01J 37/03: Precipitation; Co-precipitation
- B01J 37/04: Mixing {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/088: {Decomposition of a metal salt}
- B01D 2251/2062: Ammonia
- B01D 2255/206: Rare earth metals
- B01D 2255/20707: Titanium
- B01D 2255/20715: Zirconium
- B01D 2255/20723: Vanadium
- B01D 2255/2073: Manganese
- B01D 2255/20738: Iron
- B01D 2255/20776: Tungsten
- B01D 2255/30: Silica
- B01D 2258/012: Diesel engines and lean burn gasoline engines
- B01D 2258/014: Stoichiometric gasoline engines
- B01J 2523/00: Constitutive chemical elements of heterogeneous catalysts
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02T 10/12: Improving ICE efficiencies
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A catalyst composition represented by the general formula XVO4/S wherein XVO4 stands for TransitionMetal-Vanadate, or a mixed TransitionMetal-/RareEarth-Vanadate, and S is a support comprising TiO2.

## Claims

### Claim 1

A catalyst composition comprising:
XVO4/S
wherein
XVO4 stands for:
(a) a an Fe-Vanadate, optionally in mixture with other Transition Metal Vanadates, or
(b) a mixed Fe-/Rare Earth-Vanadate, optionally in mixture with one or more other Transition Metal Vanadates; and
S is a support comprising TiO2.

### Claim 2 (depends on 1)

The catalyst composition according to claim 1, wherein the other Transition Metal is selected from the group consisting of Mn, Cu, Zn, Zr, Nb, Mo, Ta, W, and combinations thereof.

### Claim 3 (depends on 2)

The catalyst composition according to claim 2, wherein the other Transition Metal is selected from the group consisting of Mn, Cu, Zr, and combinations thereof.

### Claim 4 (depends on 1)

The catalyst composition according to claim 1, wherein
XVO4 stands for
(a) an Fe-Vanadate, or
(b) a mixed Fe-/Rare Earth-Vanadate.

### Claim 5 (depends on 1)

The catalyst composition according to claim 1, wherein said support contains TiO2 in an amount of at least 55 wt.-%, WO3 in an amount of 1-20 wt.-%, and optionally SiO2 in an amount of up to 20 wt.-%, said catalyst composition containing XVO4 in an amount between 0.2% by weight and 25% by weight.

### Claim 6 (depends on 1)

The catalyst composition according to claim 1, wherein the Rare Earth is Er.

### Claim 7 (depends on 1)

The catalyst composition according to claim 1, wherein the Rare Earth is selected from the group consisting of Sm, Gd and Y.

### Claim 8 (depends on 1)

The catalyst composition according to claim 1, wherein S contains SiO2 in an amount of 4-15 wt.-%.

### Claim 9 (depends on 1)

The catalyst composition according to claim 1, wherein the vanadate is selected from the group consisting of Fe0.5Er0.5VO4, Fe0.8Er0.2VO4, Fe0.75Er0.25 VO4, Fe0.65Er0.35VO4, Fe0.8Gd0.2VO4, Fe0.5Gd0.5VO4, Fe0.3Sm0.7VO4, Fe0.2Er0.8VO4, Fe0.5Er0.25Gd0.25VO4 and combinations thereof.

### Claim 10 (depends on 9)

The catalyst composition according to claim 9, wherein the support S contains TiO2 in an amount of at least 55 wt.-%, WO3 in an amount of 1-20 wt.-%, and optionally SiO2 in an amount of up to 20 wt.-%, said catalyst composition containing XVO4 in an amount between 0.2% by weight and 25% by weight.

### Claim 11 (depends on 1)

A process for the preparation of a catalyst composition according to claim 1, comprising:
a) suspending a support material containing TiO2 and XVO4 in water forming an intimate mixture comprising said support material and said XVO4,
b) evaporating excess water,
c) drying the mixture, and
d) calcining the dried mixture under air at a temperature between 500 and 850° C.

### Claim 12 (depends on 11)

The process according to claim 11, wherein the other Transition Metal is selected from the group consisting of Mn, Cu, Zn, Zr, Nb, Mo, Ta, W, and combinations thereof.

### Claim 13 (depends on 11)

The process according to claim 11, wherein the other Transition Metal is selected from the group consisting of Mn, Cu, Zr, and combinations thereof.

### Claim 14 (depends on 11)

The process according to claim 11, wherein said XVO4 is pre-heat treated at a temperature in the range of higher than 350° C. and below its melting point prior to forming the intimate mixture comprising said support material and said XVO4.

### Claim 15 (depends on 1)

A method of exhaust gas after treatment, the method comprising:
providing the composition according to claim 1; and
treating an exhaust gas with the composition.

### Claim 16 (depends on 1)

A catalyst comprising:
a catalyst composition according to claim 1; and
a binder.

### Claim 17 (depends on 16)

The catalyst composition according to claim 16, wherein XVO4 stands for a mixed Fe-/Er-Vanadate, Fe-Vanadate, optionally in mixture with other Transition Metal Vanadates.

### Claim 18 (depends on 17)

The catalyst composition according to claim 17, wherein S is a support comprising TiO2 in an amount of at least 55 wt.-%, WO3 in an amount of 1-20 wt.-%, and optionally SiO2 in an amount of up to 20 wt.-%, said catalyst composition containing XVO4 in an amount between 0.2% by weight and 25% by weight.