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Preparation method of nanometer strontium titanate catalyst

A nanometer strontium titanate and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, titanium compounds and other directions, can solve the problems of complex preparation process steps, corrosion of experimental equipment, experimental environment pollution, etc., and achieves simple process steps. , the effect of less equipment and less consumption

Inactive Publication Date: 2012-09-12
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of this method are: (1) the strontium nitrate raw material has the danger of burning and explosion, and will produce NO, NO in the subsequent sintering 2 and other harmful gases
(2) The preparation process needs to add a large amount of glacial acetic acid, which will discharge a large amount of pungent odor during subsequent drying and heat treatment, pollute the experimental environment, and corrode the experimental equipment
(3) Ethanol is used as a dispersant for butyl titanate and glycerol is used as a stabilizer in a large amount. The preparation of 0.2mol requires 400mL dispersant and 120mL stabilizer, and the production cost is high.
(4) It is necessary to adjust the pH, and the preparation process steps are complicated

Method used

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  • Preparation method of nanometer strontium titanate catalyst

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Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of nano strontium titanate catalyst, its concrete steps are as follows:

[0022] (1) prepare the tartaric acid solution of strontium carbonate

[0023] Taking strontium carbonate as raw material, using tartaric acid aqueous solution as solvent, according to the ratio of the amount of substance (mol) of strontium carbonate: the amount of substance of tartaric acid (mol): the volume (mL) of deionized water is the ratio of 1: 2: 100 , adding strontium carbonate and tartaric acid into a reaction vessel filled with deionized water, stirring at a constant temperature of 60° C. for 10 min to prepare a transparent mixed solution of strontium carbonate and tartaric acid.

[0024] (2) Preparation of homogeneous sol

[0025] After step (1) is completed, use butyl titanate as raw material, and add butyl titanate to the mixed solution of strontium carbonate and tartaric acid prepared in step (1) under the condition that the stirring speed is 300r / min T...

Embodiment 2

[0029] A kind of preparation method of nano-strontium titanate catalyst, with embodiment 1, wherein:

[0030] In the 1st (1) step, the amount of substance (mol) of strontium carbonate: the amount of substance (mol) of tartaric acid: the volume (mL) of deionized water is 1: 1: 50, and stirring temperature is 40 ℃, and stirring time is 5min.

[0031] , in step (2), the stirring speed is 200r / min, the stirring temperature is 70°C, and the stirring time is 10min.

[0032] In the step (3), the oven drying temperature is 80° C., the drying time is 8 hours, the muffle furnace firing temperature is 700° C., and the firing time is 1.5 hours.

Embodiment 3

[0034] A kind of preparation method of nano-strontium titanate catalyst, with embodiment 1, wherein:

[0035] In the (1) step, the amount of substance (mol) of strontium carbonate: the amount of substance (mol) of tartaric acid: the volume (mL) of deionized water is 1: 3: 150, and stirring temperature is 80 ℃, and stirring time is 15min.

[0036] In step (2), the stirring speed is 400 r / min, the stirring temperature is 90° C., and the stirring time is 30 min.

[0037] In step (3), the oven drying temperature is 100° C., the drying time is 12 hours, the muffle furnace firing temperature is 900° C., and the firing time is 2.5 hours.

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Abstract

The invention which discloses a preparation method of a nanometer strontium titanate catalyst belongs to the technical field of catalysts. The strontium titanate catalyst is obtained through adopting strontium carbonate and butyl titanate as raw materials and an aqueous solution of tartrate as a solvent, a dispersant and a stabilizing agent, preparing a tartrate solution of strontium carbonate, preparing a homogeneous sol, drying, and roasting. The preparation method has the advantages of environmental protection of the selected raw materials, simple process steps, less used equipment, short preparation period, safe production and low cost; and the strontium titanate catalyst prepared through adopting the method of the invention has the advantages of good crystallization degree, small particles, small particle size of 10.2nm, and high specific surface area of 25m<2> / g, and is a catalyst with large specific surface area and strong adsorption capability, so the photocatalytic activity is enhanced. The preparation method can be widely used to prepare the nanometer strontium titanate catalyst and its adulterants, and products prepared through adopting the method of the invention can be widely applied to fields of organic pollutant degradation, hydrogen production through photocatalytic decomposition of water, and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of a nanometer strontium titanate catalyst. Background technique [0002] Strontium titanate catalyst is a typical bulk perovskite-type titanium-containing composite oxide. It is the earliest perovskite catalyst used in photocatalytic materials. Photocatalytic fields such as photochemical cells have been widely used. [0003] In the catalytic reaction, high-efficiency strontium titanate catalysts need to meet the two conditions of high specific surface area and high crystallinity. In order to improve the catalytic activity of strontium titanate, nano-strontium titanate is also an effective way. At present, the demand for nano-strontium titanate catalysts in the country is 200-600 tons. Many researchers have successfully prepared nano-strontium titanate catalysts and carried out related doping and modification work, but the synthesis yield is ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02B01J35/10C01G23/00
Inventor 刘成伦王媛徐龙君谢太平张莉苏智敏
Owner CHONGQING UNIV
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