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Exhaust gas catalyst

A technology of catalysts and hydroxides, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., which can solve the problems of developing stable catalysts without durability

Active Publication Date: 2007-02-21
TREIBACHER IND AG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 4. Direct elimination of NO by decomposition, but a durable and stable catalyst has not been developed yet
[0014] The present invention aims to solve the problems concerning the improvement of thermal stability at higher temperatures at which state-of-the-art V / Ti / W / Si and V / Ti / W catalysts still suffer from strong passivation

Method used

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Embodiment Construction

[0037] The present invention is described in more detail in the following preferred embodiments.

[0038] The catalyst according to the invention is obtained starting from the following two support materials, namely the composition 81% TiO 2 -9% WO 3 -10% SiO2 2 (Ti / W / Si) and composition 90% TiO 2 -10% WO 3 (Ti / W). A combination of V and RE elements is added to this support to provide NO represented by the general formula REVO / Ti-W-Si x Reduction catalysts where RE=Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Er and Yb. The content range of the active phase is at most 5.1wt% RE element, 0.4-2.1wt% vanadium and at most 2.7wt% oxygen, which is equivalent to 2.5-8.5wt% REVO dosage.

[0039] 1. According to the preparation of the catalyst of the present invention, containing 5.0wt% Er and 1.5wt% V, loaded on the Ti-W-Si carrier

[0040] 1.1 Preparation of Ti-W-Si support

[0041] Carrier preparation is carried out according to (7): 92.68g titanium tetrachloride (TiCl 4 ) was added drop...

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Abstract

A catalyst composition represented by the general formula REVO / S, wherein RE is at least one of rare earth metals Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Er and Yb in an amount of up to 6.0 wt %; V is vanadium in an amount of 0.2 to 2.5 wt%; O is oxygen in an amount of up to 3.5 wt%; and S is a carrier containing TiO2 in an amount of at least 70 wt%, the remainder being WO3 and optionally SiO2. The catalyst composition showed high NOx removal efficiency even after aging at 750°C.

Description

technical field [0001] The present invention relates to an exhaust gas catalyst composition, hereinafter referred to as "catalyst composition", and a preparation method thereof. Background technique [0002] The reduction of nitrogen oxide emissions is one of the most challenging tasks in the field of environmental protection. For both dynamic and static applications, it has been possible to reduce NO in several ways x Emissions, including methods for improved combustion and flue gas denitrification. Although NO x The elimination efficiency varies with the process used, but none of the inventors has been able to achieve an elimination efficiency higher than 50-60%. Flue gas aftertreatment, especially when using catalytic methods, can achieve considerable efficiencies. Several types of catalysts have been tested and are active under different environments and conditions. The application of various catalysts for NO elimination is related to various reaction processes, whi...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J23/10B01D53/94B01D53/86B01J21/06B01J23/30B01J37/00B01J37/02
CPCB01J23/30B01D53/9418B01D2251/2062B01D2255/206B01D2255/20707B01D2255/20723B01D2255/20776B01D2255/30B01D2258/012B01D2258/014B01J21/063B01J23/10B01J23/22B01J37/0009B01J37/0236B01J21/00B01D53/94
Inventor K·谢尔曼茨I·贝斯泰格尔A·特洛瓦雷利E·罗基尼M·卡萨诺瓦
Owner TREIBACHER IND AG
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