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CHA zeolite prepared from Gaocen soil

A kind of Cen soil and zeolite technology, applied in the direction of methane capture, gas treatment, climate sustainability, etc., can solve the problems of low reserves of natural materials, low thermal stability, low SAR, etc., to achieve no environmental pollution, low price Inexpensive, easily industrializable effect

Active Publication Date: 2021-01-29
FUYU ZHANGJIAGANG NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A SiO 2 / Al 2 o 3 Ca-type chabazite with a molar ratio (SAR) of 4, due to the small reserves of natural products, many impurities, too low SAR and low stability heat, its application is limited, and it is generally only suitable for making adsorbents and cation exchangers

Method used

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  • CHA zeolite prepared from Gaocen soil
  • CHA zeolite prepared from Gaocen soil
  • CHA zeolite prepared from Gaocen soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Select 50g of calcined kaolin powder and 2.5g of zeolite crystals, put them into 450ml of 1mol / L KOH solution and mix them evenly to form a reaction mixture. The reactant is poured into a 750ml pressure-resistant stainless steel reactor, sealed, and placed in a 130 In a homogeneous reaction oven at ℃, the reaction time is 48h. The final synthesized product is filtered, washed and dried to make K-CHA zeolite. The XRD zeolite structure of the synthesized K-CHA zeolite was identified by powder X-ray diffractometer. Then, the K-CHA zeolite is cation-exchanged with 0.5N NaCl solution as the ion exchange liquid to obtain (Na, K)-CHA cationic zeolite, which can be applied to CO 2 with CH 4 Enrichment, CO, H in exhaust gas 2 S, HCN, COS, NH 3 Adsorption separation and removal of toxic and harmful gases such as , NOx, etc.

Embodiment 2

[0050] Select 50g of calcined kaolin powder and 2.5g of zeolite crystals, put them into 450ml of 1mol / L KOH solution and mix them evenly to form a reaction mixture. The reactant is poured into a 750ml pressure-resistant stainless steel reactor, sealed, and placed in a 150 In a homogeneous reaction oven at ℃, the reaction time is 24h. The final synthesized product is filtered, washed and dried to make K-CHA zeolite. The XRD zeolite structure of the synthesized K-CHA zeolite was identified by powder X-ray diffractometer. Then, the K-CHA zeolite is cation-exchanged with 0.5N NaCl solution as the ion exchange liquid to obtain (Na, K)-CHA cationic zeolite, which can be applied to CO 2 with CH 4 Enrichment, CO, H in exhaust gas 2 S, HCN, COS, NH 3 Adsorption separation and removal of toxic and harmful gases such as , NOx, etc. The process parameters of each embodiment are shown in Table 3:

[0051] table 3

[0052]

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Abstract

The invention provides CHA zeolite prepared from Gaocen soil, which is prepared by the following steps: taking metakaolin mineral powder as a first raw material, performing high-temperature roasting to obtain amorphous powder, adding a proper amount of CHA seed crystal into the amorphous powder, and performing hydrothermal reaction in a KOH aqueous solution to synthesize K-CHA zeolite. (Na, K)-CHAzeolite prepared by exchanging the K-CHA zeolite with a NaCl solution shows the ion exchange and adsorption properties of micro-porous zeolite. The (Na, K)-CHA zeolite disclosed by the invention canbe applied to preparation of ion exchangers and small molecules, such as enrichment of CO2 and CH4, and adsorption separation and removal of toxic and harmful gases such as CO, H2S, HCN, COS, NH3 andNOx in waste gas. The preparation method adopted in the invention is low in raw material price, simple in synthesis process, free of environmental pollution and easy to industrialize.

Description

technical field [0001] The invention relates to the technical field of zeolite molecular sieves, in particular to a CHA zeolite made from high zenite. Background technique [0002] The CHA structure type zeolite was previously found in natural minerals, commonly known as chabazite. A SiO 2 / Al 2 o 3 Ca-type chabazite with a molar ratio (SAR) of 4 is generally only suitable for making adsorbents and cation exchangers because of its small reserves, high impurities, too low SAR and low heat of stability, which limit its application. [0003] The structure of small pores and large cavities makes the low-silica CHA zeolite molecular sieve adsorbent have a very prominent application prospect in gas adsorption separation and purification. For example, the zeolite adsorbent has a particularly strong selective adsorption of CO 2 selectivity for CH 4 and N 2 The separation selectivity of CO 2 / CH 4 = 24-51 and CO 2 / N 2 =127-135, can be applied to remove CO from natural gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30B01D53/02
CPCB01J20/18B01D53/02B01D2257/502B01D2257/304B01D2257/408B01D2257/406B01D2257/308B01D2257/504B01D2257/7025Y02C20/20Y02C20/40
Inventor 龙英才李瀚文濮鹏翔曹宇凡
Owner FUYU ZHANGJIAGANG NEW MATERIALS TECH CO LTD