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Oxide and molecular sieve compound catalyst and preparation and application thereof

A composite catalyst and molecular sieve technology, which is applied in molecular sieve catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of ozone layer destruction, low selectivity, difficult to be removed, etc., and achieve good N2 selectivity and catalytic activity High, strong anti-HCs poisoning effect

Inactive Publication Date: 2017-01-11
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MnO developed by R T.Yang research group x –CeO 2 Catalyst, at 120°C, space velocity is 42000h -1 The complete conversion of NO can be achieved under the condition of 2 Lower selectivity, more N 2 o
N 2 O can destroy the ozone layer and is more difficult to remove

Method used

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  • Oxide and molecular sieve compound catalyst and preparation and application thereof
  • Oxide and molecular sieve compound catalyst and preparation and application thereof
  • Oxide and molecular sieve compound catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Preparation of a low-temperature denitration catalyst composited with oxides and molecular sieves, the steps are as follows:

[0026] First, take 12.08g of Cu(NO 3 ) 2 ·3H 2 O was dissolved in 500mL of deionized water to prepare 0.1mol / L Cu(NO 3 ) 2 solution. Add H-SSZ-13 with a Si / Al ratio of 13.6 into the copper nitrate solution, stir in an oil bath at a constant temperature of 80°C for 2h, filter and wash the sample with deionized water, and bake it at 100°C for 12h.

[0027] Preparation of Composite Catalyst Mn by Impregnation Method x -Cey / Cu-SSZ-13, take 1.34g of manganese nitrate and 0.45g of cerium nitrate, dissolve in a certain amount of deionized water, then add the prepared copper-based molecular sieve catalyst Cu-SSZ-13 into the mixed solution, magnetic Stir until it becomes a paste, dry the paste mixture at 100°C overnight, and then place it in a muffle furnace for calcination at 550°C for 4h. MnO in the catalyst x , CeO 2 , Cu-SSZ-13 p...

Embodiment 2

[0034] Example 2: Preparation of a low-temperature denitration catalyst Mn compounded with oxides and molecular sieves x -Ce y / Cu-SSZ-13, the basic steps are the same as in Example 1, except for MnO x , CeO 2 , The percentage of Cu-SSZ-13 was changed to 4%, 6%, 90%.

Embodiment 3

[0035] Example 3: Preparation of a low-temperature denitration catalyst Mn compounded with oxides and molecular sieves x -Ce y / Cu-SSZ-13, the basic steps are the same as in Example 1, except for MnO x , CeO 2 , The percentage of Cu-SSZ-13 was changed to 8%, 2%, 90%.

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Abstract

The invention relates to an oxide and molecular sieve compound catalyst and preparation and application thereof, and belongs to the technical fields of environmental material, environmental catalysis and environmental protection. The catalyst is prepared by taking Cu-SSZ-13 as a primary active component and manganese oxide and cerium oxide as secondary active components exerting synergistic effect, and an impregnation method is adopted. The catalyst is characterized in that low-temperature activity is greatly improved while good medium-high temperature activity of the Cu-SSZ-13 and N2 selectivity are sustained, light-off temperature is reduced to 80DEG C, and NOx conversion rate higher than 90% is achieved within the temperature range of 100-200DEG C; NH3 is taken as a reducing agent, total gas flow rate is 300ml / min, and airspeed is respectively controlled to be 15000, 50000 and 100000h<1>. The catalyst is suitable for both low-temperature NOx treatment after dust separation and desulfation in stationary-source flue gas treatment and low-temperature NOx treatment of cold-start stage in diesel exhaust treatment.

Description

technical field [0001] The invention belongs to the technical fields of environmental materials, environmental catalysis and environmental protection, and relates to the purification of nitrogen oxides in stationary source flue gas and diesel vehicle exhaust, in particular to the preparation and application of an ion-exchanged molecular sieve and oxide combined catalyst structure. Background technique [0002] In recent years, the research on low-temperature SCR catalysts has received extensive attention. The low-temperature SCR process generally refers to the catalyst in the SCR reaction device, and its optimum activation temperature range is 125-200°C or even lower. In industry, the research and development of low-temperature catalysts can place the SCR device after the electrostatic precipitator and desulfurization, so as to save the energy consumed by preheating the flue gas to meet the high temperature conditions of high-temperature industrial catalysts, and at the same...

Claims

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Application Information

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IPC IPC(8): B01J29/78B01D53/90B01D53/56
CPCB01J29/783B01D53/8628B01D53/90B01J37/0201B01J37/088B01J2229/186
Inventor 刘庆岭付振超刘彩霞郭铭玉
Owner TIANJIN UNIV
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