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Preparation method of heteropoly acid catalysts by taking organic modified concave-convex soil as carrier

A technology for modifying attapulgite and attapulgite, which is applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., and can solve the problems of small specific surface area of ​​heteropolyacids, difficulty in recycling easily soluble in polar solvents, etc. , to achieve the effects of improved reusability, stable activity and simple production process

Active Publication Date: 2012-07-11
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heteropolyacids can be dissolved in the reaction system where water and other polar organic substances exist, and play a homogeneous catalytic effect on the reaction. The reaction conditions are mild, the toxicity and volatility are small, and the catalytic efficiency is high. However, due to the small specific surface area ( 2 / g), especially in homogeneous catalysis, it is easily soluble in polar solvents and makes recovery difficult

Method used

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  • Preparation method of heteropoly acid catalysts by taking organic modified concave-convex soil as carrier
  • Preparation method of heteropoly acid catalysts by taking organic modified concave-convex soil as carrier
  • Preparation method of heteropoly acid catalysts by taking organic modified concave-convex soil as carrier

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Preparation of phosphotungstic acid catalyst supported by attapulgite modified with silane coupling agent KH550: Attapulgite modified with KH550 2g, heat and vacuumize for 90min, add phosphotungstic acid containing 0.6g of phosphotungstic acid under vacuum Ethanol-water (1:1, v:v) solution, stirred overnight, filtered, washed with ethanol-water mixture, and the residual solvent was removed under vacuum to obtain a supported phosphotungstic acid catalyst.

[0018] It has been determined that the loading capacity of phosphotungstic acid is 20%, and the specific surface area is 160.3m 2 / g, the pore volume is 0.255cm 3 / g.

Embodiment 2

[0020] Preparation of phosphomolybdic acid catalyst with silane coupling agent KH550 modified attapulgite as carrier: 2 g of KH550 modified attapulgite, heat and vacuumize for 150 min, add 50 mL of ethanol solution containing phosphomolybdic acid, stir overnight, filter , washed with ethanol, and removed the residual solvent under vacuum to obtain a supported phosphomolybdic acid catalyst.

[0021] It has been determined that the loading capacity of phosphomolybdic acid is 25%, and the specific surface area is 146.7m 2 / g, the pore volume is 0.238cm 3 / g.

Embodiment 3

[0023] Preparation of phosphotungstic acid catalyst with attapulgite modified by silane coupling agent SG-Si900 as the carrier: 2g of attapulgite modified by SG-Si900, heat and vacuumize for 90min, add 50mL of cyanogen phosphotungstate solution , stirred overnight, filtered, washed, and removed the residual solvent under vacuum to obtain a loaded phosphotungstic acid catalyst.

[0024] After determination, the relative contents of some elements in the product are shown in Table 1.

[0025] X-ray energy spectrum (XPS) relative content of table 1 sample

[0026]

[0027] From the XPS relative content of the samples in Table 1, it can be seen that the relative content of O element after modification increases to 51.16%, and the relative content of W and P elements are 3.43% and 0.55%, respectively.

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Abstract

The invention relates to a preparation method of heteropoly acid loaded on organic modified concave-convex soil, belonging to the technical field of the concave-convex soil utilization and heteropoly acid fixation. The method takes the organic modified concave-convex soil as a carrier, and loading is carried out to the heteropoly acid, so as to obtain loaded heteropoly acid catalysts. On one hand, the method can improve the performance of the heteropoly acid, realizes repeated utilization of the heteropoly acid, and improves the utilization rate of the heteropoly acid and the application range, thereby laying the foundation for the fixation of the heteropoly acid; on the other hand, the application range of the concave-convex soil is expanded, the added value of the concave-convex soil isincreased, and the method has good guiding function to the application that the concave-convex soil is used as the catalyst carrier.

Description

technical field [0001] The invention discloses a method for preparing a heteropolyacid loaded on attapulgite organically modified by a silane coupling agent, and belongs to the technical field of utilization of attapulgite and immobilization of heteropolyacid. Background technique [0002] Heteropolyacids and their salts are very promising catalysts with super-acidity and redox properties, and without changing the structure of heteropolyanions, by selecting constituent elements (coordinating atoms, central atoms) And counter ions, etc.), the catalytic performance can be adjusted systematically, and it has developed rapidly in applied research and development in recent years. Heteropolyacids can be dissolved in the reaction system where water and other polar organic substances exist, and play a homogeneous catalytic effect on the reaction. The reaction conditions are mild, the toxicity and volatility are small, and the catalytic efficiency is high. However, due to the small s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/16B01J35/02B01J27/19B01J27/188B01J23/30B01J21/08B01J37/08
Inventor 金青哲张丽霞单良刘元法黄健花王兴国
Owner JIANGNAN UNIV
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