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Method for preparing solid base catalyst with high specific surface by hybrid composite precursors

A technology of solid base catalyst and hybrid compounding, which is applied in the preparation of organic compounds, catalysts for physical/chemical processes, chemical instruments and methods, etc. It can solve the problems of easy product aggregation, small specific surface area, large sewage discharge, etc., and achieve catalytic High activity, large specific surface area, and narrow pore size distribution

Inactive Publication Date: 2009-10-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for better controllability over how pores can be formed by combining different materials together with strong bonds between them without causing damage or contamination during manufacturing processes. It also includes methods that produce these composites at low cost while minimizing harmful chemicals used therein.

Problems solved by technology

This patented technical describes different ways to make strong base catalysers without causing issues like contamming environments during manufacturing processes. These techniques involve combining certain types of materials together into one single unit called a mixture before being used at once. By doing these steps correctly, they ensure consistently good results even when there may exist variations between batches. Additionally, the resulting compositions contain various forms of metallates, including LDHs, supported heteropolymer structures made up of other compounds, and complex carboxyl residues generated through neutral exchange with weak cations. Overall, this approach provides improved efficiency and flexibility while minimizing waste generation and improving economic feasibleness compared to existing solutions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh Mg(NO 3 ) 2 ·6H 2 O and Al (NO 3 ) 3 ·9H 2 O is dissolved in 30ml deionized water to prepare a mixed salt solution, of which Mg 2+ The molar concentration of is 0.3mol / L, Al 3+The molar concentration is 0.1 mol / L; sodium hydroxide and sodium carbonate are used to prepare 30 ml of a mixed alkali solution with a sodium hydroxide molar concentration of 0.64 mol / L and a sodium carbonate concentration of 0.2 mol / L. Pour the prepared mixed salt solution and mixed alkali solution quickly into a colloid mill rotating at high speed (6000 revolutions per minute) at room temperature, and stir vigorously for 5 minutes. Centrifuge the obtained suspension, and then wash it to pH= 7. Obtain a precipitate. Dissolve 0.54g glucose in 30ml deionized water to prepare a solution, and add the resulting precipitate, wherein the molar ratio of metal ions to sugar in the precipitate is 0.25; transfer the above mixed solution to a high-pressure reactor with a polytetrafluoroethylene liner Afte...

Embodiment 2

[0016] Weigh Mg(NO 3 ) 2 ·6H 2 O, Ca(NO 3 ) 2 ·4H 2 O, and Al(NO 3 ) 3 ·9H 2 O is dissolved in 30ml deionized water to prepare a mixed salt solution, of which Mg 2+ The molar concentration of is 0.3mol / L, Ca 2+ The molar concentration of is 0.1mol / L, Al 3+ The molar concentration is 0.2 mol / L; sodium hydroxide and sodium carbonate are used to prepare 30 ml of a mixed alkali solution with a sodium hydroxide molar concentration of 1.0 mol / L and a sodium carbonate concentration of 0.5 mol / L. Pour the prepared mixed salt solution and mixed alkali solution quickly into a colloid mill rotating at high speed (5000 revolutions per minute) at room temperature, vigorously rotate and stir for 2 minutes, centrifuge the obtained suspension, and then wash with water until PH= 7. Obtain a precipitate. Dissolve 3.24g of sucrose in 30ml of deionized water to prepare a solution, and add the resulting precipitate, in which the molar ratio of metal ions to sugar in the precipitate is 1.0; the above m...

Embodiment 3

[0019] Weigh Mg(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Cu(NO 3 ) 2 ·6H 2 O and Al (NO 3 ) 3 ·9H 2 O is dissolved in 30ml deionized water to prepare a mixed salt solution, of which Mg 2+ The molar concentration is 0.4mol / L, Cu 2+ The molar concentration of is 0.1mol / L, Co 2+ The molar concentration of is 0.05mol / L, Al 3+ The molar concentration is 0.3 mol / L; sodium hydroxide and sodium carbonate are used to prepare 30 ml of a mixed alkali solution with a sodium hydroxide molar concentration of 2.5 mol / L and a sodium carbonate concentration of 1.0 mol / L. Pour the prepared mixed salt solution and mixed alkali solution quickly into a colloid mill rotating at high speed (4000 rpm) at room temperature, vigorously rotate and stir for 3 minutes, centrifuge the obtained suspension, and then wash with water to PH= 7. Obtain a precipitate. Dissolve 3.4g of fructose in 30ml of deionized water to prepare a solution, and add the resulting precipitate, wherein the molar ratio of metal ions to su...

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Abstract

The invention relates to a method for preparing solid base catalyst with high specific surface by hybrid composite precursors, belonging to the technical field of preparation of composite metal oxide. The method comprises the following steps of: according to the characteristics of designability in structure and adjustability in laminate composition of laminated composite metal hydroxide, introducing a certain amount of Mg and Al, or Ca, Cu, Co, In and Ga on the laminate, preparing laminated compound, obtaining hybrid composite precursors by hybridization with carbon, then conducting high-temperature roasting on the precursors and obtaining the solid base catalyst of composite metal oxide with high specific surface and mesoporous structure. Due to introduction of the carbon into the precursors, the composite metal oxide obtained by the method has the characteristics of narrow pore size distribution and large specific surface area and the like, and the application of the catalyst in Knoevenagel condensation reaction of benzaldehyde and ethyl cyanoacetate shows good base catalytic activity.

Description

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Claims

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Application Information

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Owner BEIJING UNIV OF CHEM TECH
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