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Scr catalysts containing iron vanadate

A catalyst, metal vanadate technology, applied in or their group, l0.33Er0.33VO4 field, can solve the problems of small active temperature window, vanadium catalyst deactivation and the like

Pending Publication Date: 2021-10-22
JOHNSON MATTHEY PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, vanadium catalysts are generally prone to deactivation problems at higher temperatures and are generally limited to a smaller temperature window of activity
This can be problematic, especially for mobile applications with varying exhaust temperatures

Method used

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  • Scr catalysts containing iron vanadate
  • Scr catalysts containing iron vanadate
  • Scr catalysts containing iron vanadate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] Embodiment 1: prepare catalyst with vanadyl oxalate and ferric vanadate

[0118] A catalyst was prepared with the following formulation comprising V from vanadyl oxalate: from FeVO in a weight ratio of 50:50 4 V:

[0119] 55g / ft 3 Element V vanadyl oxalate

[0120] 55g / ft 3 Element V FeVO 4

[0121] 3.21g / in 3 5 wt% WO 3 / 5wt%SiO 2 / TiO 2

[0122] 0.8g / in 3 colloidal silica sol

[0123] 0.2% - 0.3% by weight of xanthan gum by mass of wet washcoat

[0124] 150g / ft 3 Ammonium metatungstate of element W

[0125] Ammonium Hydroxide (for adjusting pH to 8-9)

[0126] Total Calcined Washcoat Loading = 4.28 g / in 3

[0127] The total vanadium loading (expressed as V 2 o 5 +TiO 2 V 2 o 5 weight%)=3.78 weight%

[0128] Note again that throughout this specification, TiO in this calculation 2 Refers to the TiO in the preparation 2 content instead of doped TiO 2 load capacity.

[0129] V from vanadium oxalate: from FeVO was also prepared at weight ratios...

Embodiment 2

[0146] Example 2: Aging Stability

[0147] The catalysts of Example 1 (each with 110 g / ft 3 The NOx conversion of the element V loading); the catalyst was tested fresh and aged at 580°C for 100 hours. The results are shown in figure 1 middle.

[0148] The results show that catalysts prepared with blends of vanadyl oxalate and iron vanadate provide increased aging stability at low temperatures.

Embodiment 3

[0149] Embodiment 3: V load

[0150] A 50:50 catalyst from Example 1 was prepared with 110 g / ft 3 The vanadium loading, where 3.78 wt% of the total V 2 o 5 +TiO 2 V 2 o 5 , and V from vanadyl oxalate: from FeVO 4 The ratio of V is 50:50. Additional catalyst samples were prepared with increasing vanadium loading, but maintaining the 50:50 ratio. The catalyst was then tested for NOx conversion at 225°C and 500°C at 500 ppm NO, ANR 1.05, at 60k SV. The catalysts were tested fresh and after aging for 100 hours at 580°C.

[0151] The results are shown in figure 2 middle. By using a blend of iron vanadate and vanadium oxalate according to Example 1 (nominal 3.78 wt% V 2 o 5 , with V 2 o 5 +TiO 2 % of ), both fresh and aged performance can be improved by increasing the vanadium loading. This results in improved performance and good stability.

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Abstract

Methods and compositions related to a selective catalytic reduction catalyst comprising iron and vanadium, wherein the vanadium is present as (1) one or more vanadium oxides, and (2) metal vanadate of the form FexMyVO4, x=0.2 to 1 and y=1-x, and M comprises one or more non-Fe metals when y > 0.

Description

Background technique [0001] Nitrogen oxides (NO x ) are typically produced when fuels are combusted and are emitted from mobile sources such as motor vehicles and stationary sources such as power plants or incinerators. These nitrogen compounds are believed to be the main cause of acid rain and smog formation. In view of stricter environmental protection regulations and more concern for protecting the environment, more research is being conducted focusing on the reduction of nitrogen compounds by catalysts. [0002] Selective catalytic reduction (SCR) devices using active materials such as vanadium are commonly used to remove nitrogen compounds emitted from stationary and mobile sources. Ammonia is known as a suitable reducing agent for such systems. [0003] However, vanadium catalysts are generally prone to deactivation problems at higher temperatures and are generally limited to a smaller temperature window of activity. This can be problematic, especially for mobile app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J23/745B01J23/83B01J21/06B01D53/94F01N3/20B01J23/00B01J23/22B01J35/00B01J35/04B01J37/02F01N3/28
CPCB01J23/8472B01J23/745B01J23/83B01J21/063F01N3/2066B01J2523/00B01J37/0221B01J23/002B01J23/22F01N2510/06B01D2258/01B01D53/9418B01D2255/20738B01D2255/20723B01D2255/20707Y02T10/12B01J35/19B01J35/56B01J2523/3712B01J2523/55B01J2523/842B01J2523/31B01J2523/3775B01J6/001B01J23/8871B01J37/0215
Inventor Z·艾尔沙德卡内沙林姆·阿鲁拉吉G·钱德勒O·亨明雷纳·莱佩尔特安德鲁·纽曼P·菲利普斯A·拉杰O·罗C·史密斯N·斯宾塞I·廷凯R·沃克
Owner JOHNSON MATTHEY PLC