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Method for preparing SO***/SnO*-M*O* solid super acidic catalyst and application thereof

A technology of solid super acid and catalyst, which is applied in the direction of catalyst activation/preparation, preparation of organic compounds, physical/chemical process catalysts, etc. It can solve the problems of difficult separation of catalysts and products, corrosion of reaction equipment, environmental pollution, etc., and achieves good results , Improve the conversion rate, the effect of high yield

Inactive Publication Date: 2009-11-18
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Esterification is one of the main methods for producing biodiesel. At present, homogeneous sulfuric acid is mainly used to catalyze the esterification reaction in industry, but the liquid acid will corrode the reaction equipment during the catalysis process, causing environmental pollution, and after the reaction, the catalyst and the product There are also some difficulties in the separation of
Therefore, in past studies, materials such as zeolite molecular sieves, heteropolyacids, and metal oxides have been tried to catalyze the esterification reaction of biodiesel, but these catalysts have disadvantages such as low activity and harsh conditions.
There is something in the literature on SO 4 2- / ZrO 2 Solid superacid catalysts have been reported for this type of reaction, but the overall activity is relatively low
And on SO 4 2- / SnO 2 -M 2 o 3 (M=Ga, Al or Fe) solid superacids are used to catalyze the esterification of lauric acid to synthesize biodiesel, which has not been reported in the literature so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: 34.711 grams of SnCl 4 ·5H 2 O and 0.750 g Al(NO 3 ) 3 9H 2 O was dissolved in 300mL of water, and concentrated ammonia water was added dropwise under stirring until pH = 8, aged at room temperature for 1 hour, the precipitate was centrifuged and washed with 4 wt% ammonium acetate aqueous solution, and the obtained filter cake was dried at 100°C for 12 hours, and then Soak in 3 mol / L dilute sulfuric acid for 0.5 hour, filter, dry at 100°C for 24 hours, and then bake at 500°C in air atmosphere for 3 hours to obtain Catalyst-1 (Al / Sn molar ratio is 0.0202).

Embodiment 2

[0019] Embodiment 2: 34.871 grams of SnCl 4 ·5H 2 O and 0.375 g Al(NO 3 ) 3 9H 2 O was dissolved in 300mL of water, and concentrated ammonia water was added dropwise under stirring until pH = 8, aged at room temperature for 3 hours, the precipitate was centrifuged and washed with 3 wt% ammonium acetate aqueous solution, and the resulting filter cake was dried at 90°C for 24 hours, and then Soak in 3.2 mol / L dilute sulfuric acid for 1 hour, filter, dry at 110°C for 12 hours, and then bake at 520°C in air atmosphere for 4 hours to obtain Catalyst-2 (Al / Sn molar ratio is 0.0101).

Embodiment 3

[0020] Embodiment 3: 34.534 grams of SnCl 4 ·5H 2 O and 1.125 grams of Al(NO 3 ) 3 9H 2 O was dissolved in 300mL of water, and concentrated ammonia water was added dropwise under stirring until pH = 8, aged for 2 hours at room temperature, the precipitate was centrifuged and washed with 5 wt% ammonium acetate aqueous solution, and the resulting filter cake was dried at 90°C for 36 hours, and then Soak in 2.8 mol / L dilute sulfuric acid for 1.5 hours, filter, dry at 100°C for 12 hours, and then bake at 480°C in air atmosphere for 2 hours to obtain Catalyst-3 (Al / Sn molar ratio is 0.0305).

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PUM

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Abstract

The invention belongs to the technical field of catalyst, and in particular relates to a method for preparing SO4 / SnO2-M2O3 solid super acidic catalyst and an application thereof. In the invention, the coprecipitation method is adopted to prepare and obtain two-spot mixed hydroxid precursor comtaining Sn and M (M=Ga, Al or Fe); ammonium acetate solution washing, dilute sulphuric acid soaking and high temperature roasting are carried out on the precursor to obtain the solid super acidic catalyst. The catalyst, applied to reaction of lauric acid esterified compound biodiesel, achieves good effect, the esterification rate is high and the reaction conditions are moderate.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a SO 4 2- / SnO 2 -M 2 o 3 Preparation method and application of solid superacid catalyst. Background technique [0002] Acid catalysis is a very important class of reactions. In recent years, with the improvement of environmental protection requirements, people are eager to replace the environmentally unfriendly catalysts used in some important industrial reactions, such as: HF, H 2 SO 4 、H 3 PO 4 and AlCl 3 etc. to achieve green production. SO 4 2- Promoted oxide-type solid superacids can activate C-C and C-H bonds at lower temperatures, and have the advantages of regenerability of heterogeneous catalysts and high activity and high selectivity of liquid superacids. A substitute for friendly catalysts, creating a batch of clean processes without environmental pollution. In this system, SO 4 2- / SnO 2 has an acid strength at least that of SO 4 2- / ZrO 2 quite...

Claims

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Application Information

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IPC IPC(8): B01J27/053B01J37/03B01J37/02B01J37/08C10L1/02C07C69/24C07C67/08
CPCY02E50/13Y02E50/10
Inventor 翟德伟华伟明乐英红方舒高滋
Owner FUDAN UNIV
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