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Smoke NOx-removing catalyst and preparation method

A catalyst and flue gas technology, applied in the field of flue gas deNOx catalyst and preparation, can solve the problems of catalyst specific surface area decrease, removal efficiency decrease, obvious crystallization, etc., achieve good sulfur poisoning resistance, simple preparation method, and low operating temperature wide range of effects

Inactive Publication Date: 2016-06-22
慈溪市梦园果蔬专业合作社
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Problems solved by technology

For example, the invention patent with the notification number CN101380578 discloses "An Iron-Titanium Composite Oxide Catalyst for the Selective Reduction of Nitrogen Oxides by Ammonia", which uses the ammonia water co-precipitation method to prepare a medium-temperature section with excellent SCR activity and water resistance. A catalyst with sulfur tolerance, but the specific surface area of ​​the catalyst decreases rapidly at high temperature, and the active phase crystallizes obviously, resulting in NO x The removal efficiency dropped significantly

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  • Smoke NOx-removing catalyst and preparation method
  • Smoke NOx-removing catalyst and preparation method

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Embodiment 1 to Embodiment 4

[0018] Flue gas NO removal x The preparation method of catalyst comprises the steps:

[0019] 1) Dissolve gallium-containing precursors, iron precursors and bismuth precursors in 1L of water to obtain a precursor mixture; stir the precursor mixture at room temperature for the first time, and then add a template agent for the second stirring to make It is fully mixed, and then hexamethylenetetraammonium is added for the third stirring, the third stirring is magnetic stirring, and the first solution is obtained after the third stirring is completed;

[0020] 2) heating and constant temperature of the first solution in a water bath, and then cooling to room temperature;

[0021] 3) Filtration, the obtained precipitate is suction filtered, washed with deionized water until the pH value of the filtrate is neutral, the obtained precipitate is heated to a second temperature and dried at a constant temperature; roasted at a third temperature, and then Pressing, crushing and sieving ...

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Abstract

The invention relates to a smoke NOx-removing catalyst and a preparation method. The smoke NOx-removing catalyst is characterized by being a solid solution formed by iron oxide, bismuth oxide and gallium oxide, a molar ratio of iron and bismuth elements is 0.1:1-10:1, and a molar ratio of iron and gallium elements is 0.1:1-10:1. The preparation method includes: dissolving a precursor in water; adding a template agent and hexamethylene tetramine; fully stirring and mixing; calcining precipitate. The smoke NOx-removing catalyst is wide in operation temperature range, good in performance of resisting sulfur poisoning, good in NOx removing effect and environment-friendly, the preparation method is simple, and the catalyst is high in preparing and using safety.

Description

technical field [0001] The invention relates to a flue gas deNO x Catalyst and preparation method. Background technique [0002] Currently, nitrogen oxides (NO x ) has become one of the main pollutants in air pollution, and its existence will cause natural disasters such as ozone layer destruction, greenhouse effect, acid rain, and human respiratory diseases. In addition, NO in the atmosphere x Volatile organic compounds and volatile organic compounds will undergo photochemical reactions under the excitation of sunlight to produce photochemical smog, which will cause damage to human health, buildings and cultivated land quality. From the perspective of energy structure, coal occupies an absolute dominant position in my country's primary energy and power generation energy, and more than 80% of my country's coal is directly burned, especially for power plants, industrial boilers and civil boilers. Therefore, for a long period of time in the future, NO in coal-fired flue ga...

Claims

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Application Information

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IPC IPC(8): B01J23/843B01D53/86B01D53/56
CPCB01J23/8437B01D53/8628B01D2258/0283B01J23/002B01J2523/00B01J2523/32B01J2523/54B01J2523/842
Inventor 王文群
Owner 慈溪市梦园果蔬专业合作社