MnMe/molecular sieve series catalysts and preparation and application thereof

A technology of catalysts and molecular sieves, which is applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor anti-sintering ability of active components, insufficient low-temperature activity, and unsatisfactory selectivity, etc., to achieve increased Effective surface area, low activation temperature, and improved low-temperature activity

Inactive Publication Date: 2011-03-30
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problems of this type of catalyst are: the operating temperature is higher than 350°C, the energy consumption is high, the investment cost is high, and it is easily poisoned by heavy metals such as arsenic and alkali metals in the dust.
However, these catalysts still have insufficient low-temperature activity, unsatisfactory selectivity, and resistance to SO 2 Poor toxicity and poor anti-sintering ability of active components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take manganese nitrate (Mn(NO 3 ) 2 ·6H 2 O)977.2g and copper nitrate (Cu(NO 3 ) 2 ·3H 2 (2) 38.0g, respectively dissolved in water and made into a mixed solution, then put the molecular sieve carrier RPSA 1000g into the aqueous solution to impregnate, stir constantly, evaporate the water to dryness at 30°C under vacuum conditions to obtain the catalyst precursor, and the above catalyst precursor Body was roasted at 800 DEG C for 2 hours to obtain the catalyst of the present invention. Taking the molecular sieve carrier quality as a benchmark, the loading of the catalyst Mn was 30%, and the loading of Cu was 1%. The catalyst made was: Mn(30)Cu( 1) / PSRY.

[0025] This series of catalysts is used for NH 3 Selective reduction of NOx in flue gas, reducing agent NH 3The molar ratio to NOx is 1.1:1.0, and the concentration of NOx in the flue gas is 100ppm. Reaction temperature T corresponding to NO removal rate of 50%, 85% and 95% 50 , T 85 and T 95 They are: 140°...

Embodiment 2

[0027] Get manganese nitrate 488.6g and lanthanum nitrate (La(NO 3 ) 3 ·6H 2 (2) 155.9g, respectively dissolved in water and made into a mixed solution, then 1000 grams of molecular sieve carrier HZSM-5 was immersed in the aqueous solution, stirred constantly, evaporated to dryness at a temperature of 50°C under vacuum conditions to obtain a catalyst precursor, and Above-mentioned catalyst precursor is calcined at 300 ℃ for 10 hours, obtains the catalyst of the present invention, is based on molecular sieve carrier mass, and the loading capacity of this catalyst Mn is 15%, and the loading capacity of La is 5%, is recorded as: Mn(15)La( 5) / HZSM-5.

[0028] This series of catalysts is used for NH 3 In the selective reduction of NOx, the reducing agent NH 3 The molar ratio to NOx is 1.0:1.0, and the concentration of NOx in the flue gas is 1000ppm. Reaction temperature T corresponding to NO removal rate of 50%, 85% and 95% 50 , T 85 and T 95 They are: 140°C, 200°C and 245°...

Embodiment 3

[0030] Weigh manganese nitrate 162.9g, cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O)247.9g and ferric nitrate (Fe(NO 3 ) 2 9H 2 O) 144.7g, respectively dissolved in water and made into a mixed solution, 1000g NH 4 The Y molecular sieve carrier is immersed in an aqueous solution, stirred continuously, evaporated to dryness at a temperature of 70°C under vacuum conditions to obtain a catalyst precursor, and roasting the above catalyst precursor at 300°C for 5 hours to obtain the catalyst of the present invention. The mass of the molecular sieve carrier is Benchmark, the load of this catalyst Mn is 5%, the load of Ce is 8%, the load of Fe is 2%, is recorded as: Mn(15)Ce(5)Fe(2) / NH 4 Y.

[0031] This series of catalysts is used for NH 3 In the selective reduction of NOx, the reducing agent NH 3 The molar ratio to NOx is 0.8:1.0, and the concentration of NOx in the flue gas is 600ppm. Reaction temperature T corresponding to NO removal rate of 50%, 85% and 95% 50 , T 85 and T 95 ...

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PUM

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Abstract

The invention relates to MnMe / molecular sieve series catalysts and preparation and application thereof. The catalysts of the invention comprise a carrier, a main active component and an auxiliary active component, wherein the carrier is selected from an MFI structural molecular sieve, a Y molecular sieve and a beta molecular sieve; the main active component is the oxides of metal Mn; and the auxiliary active component Me is selected from one or the combination of two or more oxides of transition metal or rare earth metal or alkaline earth. The preparation method comprises the following steps: respectively dissolving the metal salts of the metal Mn and the metal Me in water, putting the molecular sieve carrier into the water solution, soaking, drying to obtain the catalyst precursors, and then calcinating to obtain the catalysts. The catalysts of the invention have low operating temperature, can reduce the energy consumption and the investment cost, have very low activating temperature, can have very high activity in a wide temperature range, and also have certain sulfur-resisting and water-resisting capacities.

Description

technical field [0001] The present invention relates to a kind of catalyzer used in air pollution control technology, relate to a kind of catalyzer of MnMe / molecular sieve series in particular, can be used for low temperature NH 3 Selective reduction NOx catalyst; the invention also relates to the preparation method and application of the catalyst. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants that cause a series of problems such as acid rain and photochemical smog that damage the earth's ecological environment, and it is also the focus and difficulty of atmospheric environmental governance. In 2005, the national NO x The total emissions will reach about 18 million tons, and the emissions from the power industry will account for about 1 / 2. It is estimated that the national NO x Emissions will reach around 29 million tons. In July 2004, my country promulgated and implemented the "Emission Standard of Air Pollutants for Thermal Pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J29/16B01J29/78B01J29/80B01D53/56B01D53/86
Inventor 王虹许光文李翠清宋永吉丁福臣迟姚玲林德海
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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