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Preparation method and applications of monolithic catalyst used for catalyzing and purifying ammonia-containing waste gas

A monolithic catalyst, monolithic catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of increased pressure drop of catalytic reactor and catalyst utilization rate Low, high catalyst loss rate and other issues, to achieve the effect of N2 selectivity and high low temperature conversion rate, low complete conversion temperature, and low price

Inactive Publication Date: 2012-02-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention overcomes many problems existing in the granular catalyst: (1) the granular catalyst is filled irregularly in the reactor, causing the pressure drop of the catalytic reactor to increase; (2) the granular catalyst collides with each other in the reactor, and the catalyst loss rate is high (3) The particle catalysts are in contact with each other, which is not conducive to the direct arrival of the reactants to the active center, the influence of internal diffusion is large, and the utilization rate of the catalyst is low; (4) The industrial application of particle catalysts is not easy to install

Method used

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  • Preparation method and applications of monolithic catalyst used for catalyzing and purifying ammonia-containing waste gas
  • Preparation method and applications of monolithic catalyst used for catalyzing and purifying ammonia-containing waste gas
  • Preparation method and applications of monolithic catalyst used for catalyzing and purifying ammonia-containing waste gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 4g 10wt.%Ag / Al 2 o 3 Catalyst, mixed with 50ml deionized to make Ag / Al 2 o 3 Catalyst slurry; the quality is 4.4692g, the volume is 8cm 3 The cube-shaped honeycomb wire mesh carrier was immersed in it, and it was taken out after 10 minutes. First, it was dried at 100°C; then, the sample was immersed in the above-mentioned Ag / Al 2 o 3 In the catalyst slurry, repeated 3-4 times; then, the Ag / Al 2 o 3 The honeycomb wire mesh catalyst was calcined at 600°C for 3h to obtain Ag / Al 2 o 3 Honeycomb wire mesh catalyst. Ag / Al 2 o 3 Honeycomb wire mesh catalyst for NH 3 Conversion rate and N 2 The selectivity curve as a function of temperature figure 1 shown.

Embodiment 2

[0029] According to the preparation method of the monolithic catalyst of the present invention in Example 1, the catalytically active component of the monolithic catalyst is changed to 10wt.%Cu / TiO 2 , where the mass of the honeycomb wire mesh carrier is 5.0215g, the drying temperature is 120°C, the Cu / TiO 2 The honeycomb wire mesh catalyst is calcined at 450°C to obtain Cu / TiO 2 Honeycomb wire mesh catalyst.

Embodiment 3

[0031] According to the preparation method of the monolithic catalyst of the present invention in Example 1, the catalytically active component of the monolithic catalyst is changed to 3wt.%Cu / CeO 2 , where the mass of the honeycomb wire mesh carrier is 4.4031g, the Cu / CeO 2 The honeycomb wire mesh catalyst is calcined at 500°C to obtain Cu / CeO 2 Honeycomb wire mesh catalyst.

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Abstract

The invention relates to a preparation method and applications of a monolithic catalyst used for catalyzing and purifying ammonia-containing waste gas. The monolithic catalyst consists of two parts, namely a honeycomb-shaped metal wiremesh carrier and a catalytic active component, wherein the honeycomb-shaped metal wiremesh carrier material is a FeCrAl stainless steel wiremesh; and the catalytic active component consists of a metal active component and an inorganic oxide carrier; the metal active component is one or more of Ag, Cu, Fe and Mn; and the inorganic oxide carrier is one or more of Al2O3, TiO2, SiO2, ZrO2 and CeO2. The monolithic catalyst has a three-dimensional permeating structure and properties such as higher heat transfer coefficient and mass transfer coefficient and lower pressure drop, is suitable for the installations of various reactors and can be directly applied in the industrial field. For example, the Ag / Al2O3 honeycomb-shaped metal wiremesh catalyst can be used for completely converting NH3 at 220 DEG C and have higher selectivity to N2 (>80%); and the catalyst has high stability and wide operating temperature window and is insensitive to the change of space velocity.

Description

technical field [0001] The invention is applied to the technical field of environmental catalytic purification, and relates to a method for catalytically eliminating ammonia from industrial waste gas and selectively catalytically oxidizing ammonia into N2 without secondary pollution. 2 and H 2 Preparation and application of monolithic catalysts for O. Background technique [0002] With the progress of society and the improvement of people's living standards, the protection of atmospheric environment has become a very important research topic. And nitrogen-containing compounds, such as NO, N 2 O, NO 2 and NH 3 , the pollution of the environment has attracted more and more attention. Ammonia gas has become a research hotspot in recent years because of its irritating effect on human eyes and nasal mucosa at low concentrations. The sources of ammonia mainly include, industry (tail gas emission during liquid nitrogen production, NH in coal-fired flue gas 3 -NH in SCR react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J23/72B01J23/83B01J23/89B01J35/04B01D53/58B01D53/86
CPCY02A50/20
Inventor 曲振平王忠全燮李新勇孙红
Owner DALIAN UNIV OF TECH
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