Modified small-pore molecular sieve adsorbent and its preparation method and application

A molecular sieve and adsorbent technology, applied in the field of modified small-pore molecular sieve adsorbent and its preparation, can solve the problems of strict synthesis conditions of metal organic framework compounds, expensive production cost of graphene oxide components, damage to internal pore structure, etc. The effect of mass production, easy raw materials and long penetration time

Active Publication Date: 2020-12-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In view of the technical problems existing in the prior art, for example: activated carbon has poor ammonia adsorption performance, and the regeneration method of heating is easy to destroy the internal pore structure; the production cost of graphene oxide components is expensive; metal-organic framework compounds (MOFs) The synthesis conditions are relatively strict, and the preparation process is complicated; the present invention firstly provides a modified molecular sieve adsorbent

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  • Modified small-pore molecular sieve adsorbent and its preparation method and application
  • Modified small-pore molecular sieve adsorbent and its preparation method and application
  • Modified small-pore molecular sieve adsorbent and its preparation method and application

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no. 1 approach

[0047] The present invention provides a modified molecular sieve adsorbent, which includes: a carrier; and an active ingredient loaded on the carrier, the active ingredient includes alkaline earth metals and / or transition metals; wherein, the active ingredient and the carrier The weight ratio is 0.01-0.5; the carrier includes molecular sieves, and the average pore diameter of the molecular sieves is 0.001-2nm. The carrier of the present invention has a large amount of B acid (protonic acid), and then by using the active ingredient to modify the carrier, more L acid (aprotic acid) can be brought, thereby greatly improving the adsorption capacity of the modified molecular sieve adsorbent .

[0048] It should be noted that the modified molecular sieve adsorbent of the present invention is not a catalyst, nor does it use a chemical reaction to convert NH 3 Elimination, which is mainly used to adsorb NH 3 , the adsorbed NH 3 Did not participate in the chemical reaction, is the N...

no. 2 approach

[0058] The second embodiment of the present invention provides a method for preparing the modified molecular sieve adsorbent of the first embodiment of the present invention, comprising the following steps:

[0059] Preparation process: dissolving the carrier and the salt of the active ingredient in water to obtain a precursor slurry;

[0060] Drying process: drying the precursor slurry to obtain a dry product;

[0061] Roasting process: activating and roasting the dried product to obtain a roasted product; wherein,

[0062] The active ingredients include alkaline earth metals and / or transition metals;

[0063] The active ingredient is loaded on the carrier, and the weight ratio of the active ingredient to the carrier is 0.01-0.5, preferably 0.01-0.3, more preferably 0.02-0.2;

[0064] The carrier includes molecular sieves, and the average pore diameter of the small-pore molecular sieves is 0.001-2 nm.

[0065] Specifically, in the preparation process, the soluble active in...

no. 3 approach

[0070] The third embodiment of the present invention provides a modified molecular sieve adsorbent composition, which comprises the modified molecular sieve adsorbent described in the first embodiment or prepared by the method for preparing the modified molecular sieve adsorbent in the second embodiment modified molecular sieve adsorbent.

[0071] The third embodiment of the present invention also provides a modified molecular sieve adsorbent prepared according to the modified molecular sieve adsorbent according to the first embodiment of the present invention or the method for preparing the modified molecular sieve adsorbent according to the second embodiment of the present invention. Adsorb NH in exhaust gas 3 purposes, preferably, the waste gas includes ammonia-containing waste gas discharged from agricultural sources, industrial flue gas and motor vehicle exhaust; more preferably, the modified molecular sieve adsorbent can be used at normal temperature, such as 20-30 ° C, ...

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Abstract

The invention provides a modified small-pore molecular sieve adsorbent, and a preparation method and a use thereof. The modified molecular sieve adsorbent comprises: a carrier; and an active componentloaded on the carrier, and the active component comprises an alkaline earth metal and / or a transition metal, wherein a weight ratio of the active component to the carrier is 0.01-0.5, preferably 0.01-0.3 and more preferably 0.02-0.2; and the carrier comprises a molecular sieve having an average pore size of 0.001-2 nm. The modified molecular sieve adsorbent can adsorb ammonia gas at normal temperature (20-30 DEG C), has the characteristics of large adsorption capacity and long penetration time, and can well meet the practical application requirements. The modified molecular sieve adsorbent ofthe present invention can be used for recovering ammonia gas generated by agricultural sources such as breeding industry plants, and also can be used to treat industrial flue gas and escape ammonia generated in motor vehicle (diesel vehicle) tail gas SCR systems.

Description

technical field [0001] The invention relates to a modified small-pore molecular sieve adsorbent, a preparation method and application thereof, and belongs to the technical field of ammonia gas purification and recovery. Background technique [0002] Ammonia (NH 3 ) is a polluting and highly corrosive air pollutant, which will have a great impact on human health and the ecological environment. On the one hand, ammonia can irritate the respiratory tract and other human tissues; on the other hand, ammonia can interact with atmospheric NO x and SO 2 Combined, and through a series of chemical transformations to form particulate matter, causing smog. At present, the man-made sources of ammonia in the atmosphere include industrial, agricultural and mobile sources, among which agricultural sources (livestock and poultry breeding) are the largest sources of ammonia emissions. In addition, the SCR device in the post-processing equipment of industrial sources and mobile sources oft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/28B01J20/18B01J20/30B01D53/02
Inventor 李俊华郭晶晶刘帅甘丽娜王驰中陈建军彭悦郝吉明
Owner TSINGHUA UNIV
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