Unlock instant, AI-driven research and patent intelligence for your innovation.

Catalyst for selective reduction of NOx with NH3 and preparation method thereof

A catalyst and reaction technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as high working temperature, ecological environment and human health hazards, pipeline corrosion, etc., achieve simple preparation process and improve catalytic performance , the effect of high catalytic activity

Inactive Publication Date: 2012-10-17
FUDAN UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this catalyst system has been used industrially for many years, there are still some disadvantages as follows: (1) the working temperature (300-400°C) is relatively high; (2) in the high temperature range due to N 2 O is produced in large quantities so that N 2 The generation selectivity decreases, and a new pollutant N is produced 2 O; (3) SO in high temperature range 2 to SO 3 The degree of oxidation increased, SO 3 H reacts with water to form H 2 SO 4 Deposits in the downstream pipeline, causing pipeline corrosion; (4) active component V 2 o 5 Harmful to the ecological environment and human health
Therefore, the development of environmentally friendly low-temperature NH 3 -SCR reaction catalyst is very necessary, there are reports in the literature that perovskite composite oxides are used for NO x NH 3 -SCR responsive, but overall activity is low
And about the loaded LaBO 3 (B=Mn, Fe) Perovskite Catalysts for NH Catalysis of Nitrogen Oxides 3 -SCR response has not been reported in the literature

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Catalyst for selective reduction of NOx with NH3 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: 0.716g La(NO 3 ) 3 ·6H 2 O and 0.405g Mn(CH 3 COO) 2 4H 2 O was dissolved in 20mL of water (equivalent to the concentration of each metal ion being 0.083mol / L), and after dissolving, 0.764g of citric acid was added (equivalent to a molar ratio of citric acid to total metal ions of 1.1), stirred for 3 hours and then added 1.6g TiO 2 , Stirring was continued for 3h, and then evaporated to a gel at 90°C. The gel was dried at 100°C for 24h, then at 180°C for 8h. The dried mixture was first calcined at 250°C for 3h and then at 650°C for 3h under the condition of air ventilation to obtain the supported LaBO 3 (B=Mn) perovskite catalyst, LaBO in catalyst by weight percentage 3 The content is 20%.

Embodiment 2-7

[0018] Examples 2-7: Catalysts were prepared according to the steps and conditions of Example 1. The changed preparation conditions included the type of B, the type of carrier, the calcination temperature and the content of perovskite, see Table 1.

[0019] Table 1 Loaded LaBO 3 Preparation of (B=Mn, Fe) perovskite catalyst

[0020]

Embodiment 8

[0022] Example 8: Using the above catalyst for NH of nitrogen oxides 3 Selective reduction reaction, the specific reaction conditions are as follows: reaction temperature 50-275 ℃, total gas flow rate 500mL / min, reaction gas composition of 500ppm NO, 500ppm NH 3 , 3% O 2 And balance gas nitrogen, gas hourly space velocity 2.7×10 4 -5.4×10 4 h -1 . The reactivity is shown in Table 2.

[0023] The reactivity of table 2 catalyst

[0024]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of catalysts, in particular to a load-type LaBO3 (B=Mn, Fe) perovskite selective reduction of NOx with NH3 and a preparation method thereof. In the invention, a citric acid sol-gel method is combined with a wet process dipping method to prepare a carrier-loaded citric acid complex precursor, and the precursor is roasted at high temperature to obtain the load-type perovskite catalyst. The catalyst can be used for selective reduction of NOx with NH3, the good effect is obtained, the higher conversion rate at lower reaction temperature is achieved andthe defect of the high reaction temperature of the traditional catalyst is eliminated.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to NH 3 Choose to restore NO x Supported LaBO 3 (B=Mn, Fe) perovskite catalyst and preparation method thereof. Background technique [0002] Nitrogen oxides (NO x , mainly referring to NO and NO 2 The mixture of which NO accounts for more than 90%), as an air pollutant, will not only cause harm to the human body, but also cause many environmental problems. produce NO x The two main sources of pollution are vehicle exhaust and flue gas from coal-fired power plants. From the perspective of reaction form, catalytic elimination of NO x The method can be briefly divided into NO x Direct decomposition, CO reduction, selective catalytic reduction (SCR) under oxygen-enriched conditions. Take NH 3 NH as reducing agent 3 -SCR reaction has been widely used in flue gas denitrification process, the catalyst used is V 2 o 5 -WO 3 / TiO 2 . Although this catalyst system has been u...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/83B01D53/90B01D53/56
Inventor 聂颖颖于在璐华伟明唐幸福孙亮乐英红高滋
Owner FUDAN UNIV