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Sheet cross zif-1 and preparation method thereof

A ZIF-L, sheet-like technology, applied in the field of sheet-like crossed ZIF-L and its preparation, can solve the problems of inability to obtain specific surface area products, difficult to improve specific surface area, large size, etc., and achieves short preparation time, small size, well-structured effect

Active Publication Date: 2019-01-04
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this product can be used as a carrier for palladium catalysts, there are shortcomings in both its preparation method. First, the size of the product is too large. The length of the column is about 21.45 μm and the width is about 5.84 μm, making it difficult to increase the specific surface area. ; Secondly, the preparation method cannot obtain a product with a larger specific surface area, and takes too long

Method used

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  • Sheet cross zif-1 and preparation method thereof
  • Sheet cross zif-1 and preparation method thereof
  • Sheet cross zif-1 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The concrete steps of preparation are:

[0036] In step 1, a 1wt% aqueous solution of zinc nitrate hexahydrate and a 3.75wt% aqueous solution of 2-methylimidazole were prepared respectively. Then, according to the weight ratio of the aforementioned zinc nitrate hexahydrate aqueous solution and the 2-methylimidazole aqueous solution at a weight ratio of 0.8:1.2, the two are uniformly mixed to obtain a mixed solution.

[0037] In step 2, the mixed solution is placed in an airtight state, and reacted at 115° C. for 2 hours to obtain a reaction solution. Carry out the processing of solid-liquid separation, washing, solvent activation and drying to reaction solution successively again; Wherein, solid-liquid separation processing is centrifugal separation, and its rotating speed is 6000r / min, the time is 3min, and washing processing is to use deionized water and ethanol ( or methanol) to carry out 2 alternate cleanings on the separated solid matter, the separation of the sol...

Embodiment 2

[0039] The concrete steps of preparation are:

[0040] In step 1, a 1.3wt% aqueous solution of zinc nitrate hexahydrate and a 3.5wt% aqueous solution of 2-methylimidazole were prepared respectively. Then according to the weight ratio of the aforementioned zinc nitrate hexahydrate aqueous solution and the 2-methylimidazole aqueous solution at a weight ratio of 0.9:1.1, the two are mixed evenly to obtain a mixed solution.

[0041] In step 2, the mixed solution was placed in a closed state, and reacted at 120° C. for 1.8 hours to obtain a reaction solution. Then, the reaction solution is subjected to solid-liquid separation, washing, solvent activation and drying in sequence; wherein, the solid-liquid separation process is centrifugation, the rotation speed is 7000r / min, and the time is 2.5min, and the washing process is to use deionized water and ethanol (or methanol) alternately wash the separated solid matter twice, the separation of the solid matter during cleaning is centri...

Embodiment 3

[0043] The concrete steps of preparation are:

[0044] Step 1, firstly prepare 1.5wt% zinc nitrate hexahydrate aqueous solution and 3.25wt% 2-methylimidazole aqueous solution respectively. Then, according to the weight ratio of the aforementioned zinc nitrate hexahydrate aqueous solution and the 2-methylimidazole aqueous solution at a weight ratio of 1:1, the two are mixed evenly to obtain a mixed solution.

[0045]In step 2, the mixed solution was placed in a closed state, and reacted at 125° C. for 1.5 hours to obtain a reaction solution. Carry out the processing of solid-liquid separation, washing, solvent activation and drying to reaction solution successively again; Wherein, solid-liquid separation processing is centrifugal separation, and its rotating speed is 8000r / min, the time is 2min, and washing processing is to use deionized water and ethanol ( or methanol) to alternately wash the separated solid matter 3 times, the separation of the solid matter during cleaning i...

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Abstract

The invention discloses a flaky cross ZIF‑L and a preparation method thereof. The morphology of ZIF‑L is flake-like cross shape, among which, the flakes constituting the flake-like cross shape ZIF‑L are in the shape of willow leaves, with a length of 4.5-8.5 μm, a thickness of 0.2-0.4 μm, and a center width of 1 to 3 μm, the flaky cross shape is a cross flaky cross shape, or more than three pieces of multi-piece cross shape, and the specific surface area of ​​the flaky cross shape ZIF-L is ≥303m2 / g; the method is to separate Prepare an aqueous solution of zinc nitrate hexahydrate and an aqueous solution of 2-methylimidazole, and then mix the two evenly to obtain a mixed solution. After that, first place the mixed solution in a closed state and react at 115-135°C to obtain a reaction solution. The reaction solution is sequentially subjected to solid-liquid separation, washing, solvent activation and drying to obtain the target product. It has a large specific surface area and is extremely easy to be widely used in the fields of gas storage and adsorption, as well as heavy metal ion adsorption and catalyst loading in aqueous solution.

Description

technical field [0001] The invention relates to a ZIF-L and a preparation method thereof, in particular to a sheet cross ZIF-L and a preparation method thereof. Background technique [0002] ZIF-L is a Zn 2+ The zeolite imidazolate framework material with microporous structure synthesized with 2-methylimidazole according to a certain ratio has received extensive attention in the aspects of gas storage and adsorption and the application of catalyst supports. Recently, people have made some useful attempts and efforts to obtain ZIF-L, such as the title "Palladium nanoparticles supported on a two-dimensional layered zeolitic imidazolateframework-L as an efficient size-selective catalyst", Microporous and Mesoporous Materials, 2016, 221, 220-227 ("Palladium nanoparticles attached to two-dimensional layered ZIF-L to form an effective size-selective catalyst", "Microporous and Mesoporous Materials", Vol. 221, pp. 220-227, 2016). The shape of the ZIF-L mentioned in this article i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D233/58C07F3/06B01D53/02B01J20/22
CPCB01D53/02B01J20/22C07D233/58C07F3/003C07F3/06
Inventor 王献彪丁兵丁琰李真刘瑾
Owner ANHUI UNIVERSITY OF ARCHITECTURE