Preparation method of low-temperature NH3-SCR sulfur-resistant denitration catalyst

A technology of NH3-SCR and denitrification catalysts, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of strong biological toxicity, no catalytic activity, etc., and achieve strong sulfur resistance and wide temperature window Effect

Inactive Publication Date: 2016-09-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The exhaust gas temperature of light-duty diesel engines is about 180-450°C, while traditional commercial vanadium-based SCR catalysts (V 2 o 5 -WO 3 / TiO 2 ) has an active temperature window of 300-400°C, it has basically no catalytic activity at temperatures below 250°C, and it has strong biological toxicity

Method used

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  • Preparation method of low-temperature NH3-SCR sulfur-resistant denitration catalyst
  • Preparation method of low-temperature NH3-SCR sulfur-resistant denitration catalyst
  • Preparation method of low-temperature NH3-SCR sulfur-resistant denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of Cu-SAPO-34 catalyst: the prepared ion concentration is 0.1mol.L -1 Cuprous chloride solution, soak SAPO-34 molecular sieves in cuprous chloride solution for 2 hours, then stir in a 70°C water bath for 5 hours, dry, and roast to obtain Cu-SAPO- with a Cu loading of 0.5%. 34 catalyst;

[0029] (2) Put 2g of the Cu-SAPO-34 catalyst prepared in step (1) into a quartz tube, raise the temperature of the CVD reactor to 150°C, and use 150mL / min N 2 Purge 2h;

[0030] (3) with N 2 As a carrier gas, the titanium tetraisopropoxide precursor placed in a water bath at 80°C is introduced into a condensation reflux device at 60°C to obtain saturated titanium tetraisopropoxide vapor;

[0031] (4) The titanium tetraisopropoxide vapor obtained in step (3) was mixed with N 2 After mixing, it is passed into the quartz tube, and with the additionally introduced O 2 Together (carrier gas flow rate 150mL / min), heat deposition at 400°C for 3h, anneal at 500°C for 0.5h, ...

Embodiment 2

[0034] (1) Preparation of Cu-SAPO-34 catalyst: the prepared ion concentration is 0.3mol.L -1 Copper chloride solution, soak SAPO-34 molecular sieves in copper chloride solution for 3 hours, then stir in a water bath at 60°C for 6 hours, dry, and roast to obtain a Cu-SAPO-34 catalyst with a Cu loading of 1%. ;

[0035] (2) Put 2g of the Cu-SAPO-34 catalyst prepared in step (1) into a quartz tube, raise the temperature of the CVD reactor to 175°C, and use 150mL / min N 2 Purge for 1.5h;

[0036](3) Using He as the carrier gas, the titanium tetrachloride precursor placed in a water bath at 80°C was introduced into a condensation reflux device at 60°C to obtain saturated titanium tetrachloride vapor;

[0037] (4) Combine the titanium tetrachloride steam obtained in step (3) with N 2 Pass into the quartz tube after mixing, and NH introduced separately 3 Together (carrier gas flow rate 150mL / min), heat deposition at 550°C for 1h, annealing at 450°C for 2h, and then cool down to ro...

Embodiment 3

[0040] (1) Cu-SAPO-34 catalyst preparation: SAPO-34 molecular sieve and 0.2mol.L -1 Mix the cuprous chloride solution evenly, HNO 3 Adjust the pH to 2, then ion-exchange in a water bath at 80°C for 12 hours, wash, dry, and calcinate to obtain a Cu-SAPO-34 catalyst with a Cu loading of 4%.

[0041] (2) Put 2g of the Cu-SAPO-34 catalyst prepared in step (1) into a quartz tube, raise the temperature of the CVD reactor to 200°C, and use 150mL / min N 2 Purge lh.

[0042] (3) with N 2 / He mixed gas is the carrier gas, and the isopropyl titanate precursor placed in a water bath at 80°C is introduced into a condensation reflux device at 60°C to obtain saturated isopropyl titanate vapor;

[0043] (4) Combine the isopropyl titanate vapor obtained in step (3) with N 2 After mixing, pass it into a quartz tube, heat deposition at 650°C for 0.5h together with water vapor introduced separately (carrier gas flow rate 150mL / min), anneal at 500°C for 1h, and then cool down to room temperatur...

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Abstract

The invention discloses a preparation method of a low-temperature NH3-SCR sulfur-resistant denitration catalyst. The preparation method is characterized in that titanium tetrachloride, titanium(IV) isopropoxide, isopropyl titanate and butyl titanate are used as the titanium sources of the sulfur-resistant denitration catalyst, and a chemical vapor deposition method or aqueous phase method to precipitate a TiO2 sulfur-resistant layer on the surface of a Cu-SAPO-34 catalyst or wrap the surface of the Cu-SAPO-34 catalyst with the TiO2 sulfur-resistant layer so as to form a TiO2 / Cu-SAPO-34 compound catalyst. The prepared catalyst keeps the low-temperature high-activity feature of the Cu-SAPO-34 catalyst and adopts the TiO2 sulfur-resistant layer to evidently enhance of the sulfur resistance. At 300-500 DEG C, SO2 (100-500ppm) is fed into a reaction system, and the conversion rate of NOx in the NH3-SCR reaction is above 80%. Compared with a common catalyst, the compound catalyst is wider in temperature operation window, excellent in low-temperature activity and high in sulfur resistance.

Description

technical field [0001] The invention relates to the field of catalyst preparation and light diesel engine tail gas purification, in particular to a low-temperature NH 3 - A preparation method of an SCR sulfur-resistant denitrification catalyst. Background technique [0002] With the rapid economic development, the automobile industry also develops rapidly. Compared with gasoline engines, light-duty diesel engines are increasingly valued due to their advantages in fuel economy and power. However, due to the lean combustion technology of the diesel engine, the NO in the exhaust gas will be x content increased, NO x Not only is it the main cause of acid rain, but it can also form photochemical smog. Therefore, effective control and governance of NO x It has become one of the most urgent problems to be solved in current environmental protection research. [0003] Current Control of Exhaust NO from Light Duty Diesel Vehicles x Measures for emissions mainly include:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01D53/90B01D53/56
CPCB01J29/85B01D53/8628B01D53/90B01D2255/50
Inventor 张秋林樊洁宁平王艳彩李昊宋忠贤刘昕
Owner KUNMING UNIV OF SCI & TECH
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