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Aluminium-based pseudo-hydrotalcite structuralization catalyst, and its prepn. method

A hydrotalcite structure and catalyst technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, hydrotalcite, etc., can solve the problems of decreased catalytic activity, increased particle size, and decreased reaction contact area.

Inactive Publication Date: 2006-06-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] LDHs show good application prospects in the field of heterogeneous catalysis research, but at the same time there are limitations: homogeneously dispersed mixed oxides (LDO) and particles of regenerated LDHs powders after calcination or calcination / rehydration of LDHs powders The size is extremely small, although the resulting large specific surface area is conducive to the full contact between the catalyst and the reactant substrate to achieve efficient catalytic activity and selectivity, but the catalyst particles are too small, and traditional filtration or centrifugation methods are used It is difficult to achieve complete recovery quickly and effectively; after forming, the particle size increases, the reaction contact area decreases, the catalytic activity will inevitably decrease, and the selectivity is also affected to a certain extent
Polymer materials obviously do not meet the requirements as structured catalyst substrates for LDHs

Method used

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  • Aluminium-based pseudo-hydrotalcite structuralization catalyst, and its prepn. method
  • Aluminium-based pseudo-hydrotalcite structuralization catalyst, and its prepn. method
  • Aluminium-based pseudo-hydrotalcite structuralization catalyst, and its prepn. method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Clean the cut aluminum sheet (purity 99.5%) with acetone to remove oil, then remove the surface oxide layer with 5% sodium hydroxide solution, clean it with deionized water and put it into an electrolytic cell as an anode; the electrolyte is 1.0 mol L -1 Sulfuric acid solution, using a lead plate as the cathode, the oxidation voltage is 2V / cm 2 After the aluminum sheet is anodized for 1 hour, the aluminum sheet is taken out, rinsed with deionized water and set aside.

[0042] In a 1000mL reaction vessel, 1.923g Mg(NO 3 ) 2 ·6H 2 O was dissolved in 750mL of deionized water to prepare a solution with a Mg ion concentration of 0.01mol / L, and then 12.02g of urea was added and dissolved.

[0043] Take the anodized area as 0.2m 2 Place the aluminum flakes in the mixed solution in the above reaction container, seal the container, and react at a constant temperature of 70°C for 7 days. After the solution is cooled, take out the aluminum flakes, rinse them with deionized wa...

Embodiment 2

[0046] The cut aluminum sheet (purity 95%) is cleaned and degreased with acetone, and then the surface oxide layer is removed with 3% sodium hydroxide solution, and then cleaned with deionized water and placed in an electrolytic cell as an anode, using 0.5mol· L -1 The phosphoric acid solution is used as the electrolyte, the lead plate is used as the cathode, and the oxidation voltage is 4V / cm 2After the aluminum sheet is anodized for 1 hour, the aluminum sheet is taken out, rinsed with deionized water and set aside.

[0047] In a 1000mL reaction vessel, 19.23g Mg(NO 3 ) 2 ·6H 2 O was dissolved in 750mL deionized water to prepare a solution with a Mg ion concentration of 0.10mol / L, and then 60.06g of urea was added and dissolved.

[0048] Take the anodized area as 0.5m 2 Place the aluminum flakes in the mixed solution in the above reaction container, seal the container, and react at a constant temperature of 90°C for 3 days. After the solution is cooled, take out the alum...

Embodiment 3

[0051] Wash the sheared aluminum sheet (purity 99.99%) with acetone to remove oil, then remove the surface oxide layer with 8% sodium hydroxide solution, wash with deionized water, and place it in an electrolytic cell as an anode. Use 2mol·L -1 The oxalic acid solution is used as the electrolyte for electrolysis. The oxidation voltage is 10V / cm 2 Aluminum sheet, using stainless steel as the cathode. After anodizing for 2 hours, the aluminum sheet was taken out, rinsed with deionized water and set aside.

[0052] In a 1000mL reaction vessel, 19.23g Mg(NO 3 ) 2 ·6H 2 O was dissolved in 750 mL of deionized water to prepare a solution with a Mg ion concentration of 0.10 mol / L, and 75.09 g of urea was added and dissolved.

[0053] Take the anodized area as 0.5m 2 Place the aluminum flakes in the mixed solution in the above reaction container, seal the container, and react at a constant temperature of 120°C for 2 days. After the solution is cooled, take out the aluminum flake...

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Abstract

A hydrotalcite-like structure Al-base catalyst is prepared through anodizing Al substrate, putting it in the solution containing urea and the salt of relative 2-valence metal, controlling reaction temp and time for controlling the speed of decomposing urea and in turn the release of anions, and nucleating and growing of LDHs on the Al substrate. Its advantage is high adhesion of LDHs on Al substrate. An integration of LDHs catalyst with reactor is also disclosed.

Description

technical field [0001] The invention relates to a hydrotalcite-like structured catalyst and a preparation method thereof, in particular to a preparation method of a hydrotalcite-like structured catalyst grown on an aluminum substrate. Background technique [0002] In recent years, in the design of catalysts and reactors, it has been proposed to focus on the scale effect in the design, especially to develop novel macrostructured catalysts from the macro scale. Structured catalysts combine catalyst design and reactor design to better facilitate catalysis. At present, the idea of ​​integrating the active components of catalysts, structural supports and reactors has become the most important and generally accepted new thinking in the field of catalysis. Structured catalysts and their reactors have the characteristics of improving mass transfer and heat transfer, easy realization and countercurrent operation, and reducing catalyst bed pressure in chemical reactions, which are be...

Claims

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Application Information

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IPC IPC(8): B01J27/236B01J32/00B01J37/00C01F7/785
CPCB01J21/04B01J21/16B01J23/007C01P2002/22C01P2002/72C01F7/785
Inventor 段雪杨兰雷晓东亢永珍张法智
Owner BEIJING UNIV OF CHEM TECH