Heteropoly acid containing phosphours,molybdinum and tin and its preparing method, and use of said heteropoly acid in preparing oxidizing catalyst

A technology for oxidation catalyst and heteropoly acid, which is applied in the application field of preparing oxidation catalyst, can solve the problems of restricting the scope of use and market demand, low mechanical strength, and high reaction temperature, achieve significant environmental protection and economic benefits, and improve overall performance. Good conversion rate and thermal stability

Inactive Publication Date: 2004-09-29
康喆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This vanadium catalyst has the disadvantages of low activity, low mechanical strength, high wear and high reaction temperature.
A kind of cesium-containing vanadium sulfate catalyst disclosed by Chinese Patent Publication No. 1358569A has its superiority to reducing the temperature of conversion system, improving total conversion rate and sulfuric acid output, but because of its expensive price and will use a large amount of rare metal cesium , seriously restricting its scope of use and market demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a. Take 40 grams of ammonium molybdate and add 100ml of water to stir it into a white slurry, add 30ml of 85% phosphoric acid, stir well and heat to boiling state to make the slurry turn from white to golden yellow, which is the end of the reaction. After cooling to room temperature , Dissolved with 80ml of ammonia water to make ammonium phosphomolybdate;

[0033] b. Or take 70ml of phosphoric acid, add 40 grams of ammonium molybdate and stir into a white slurry and heat to boiling state. After the ammonium molybdate is completely dissolved, the slurry will dissolve into a light yellow oily solution to make ammonium phosphomolybdate;

[0034] C, get 14.23 gram stannous hydroxides and be dissolved in the solution of 40 gram potassium hydroxides and prepare potassium hydrogen stannate;

[0035] d. Mix the ammonium phosphomolybdate prepared by item a or item b with the potassium hydrogen stannate prepared by item c, then heat to boiling state and keep it for 5-10 minutes t...

Embodiment 2

[0039] A, prepare ammonium phosphomolybdate in the same way as item a or item b in embodiment 1;

[0040] B, get 17.77 grams of potassium hydrogen stannate and join in the ammonium phosphomolybdate prepared by item a, prepare the heteropolyacid containing phosphorus, molybdenum, tin, potassium by the same operation method of item d in embodiment 1;

[0041] c, the remaining operation steps are carried out according to the operation steps of item e and item f in embodiment 1.

Embodiment 3

[0043] A, prepare ammonium phosphomolybdate in the same way as item a or item b in embodiment 1;

[0044] B, get 16.33 gram of sodium bistannite and join in the ammonium phosphomolybdate prepared by item a, prepare the heteropolyacid containing phosphorus, molybdenum, tin, sodium by the same operating method of item d in embodiment 1;

[0045] c, the remaining operation steps are carried out according to the operation steps of item e and item f in embodiment 1.

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PUM

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Abstract

The present invention discloses a kind of heteropoly acid containing P in phosphide, Mo in molybdic compound and Sn in stannide in the molar ratio of 0.21-1.24 to 0.1-0.36 to 0.05-0.19. The preparation process of the heteropoly acid includes preparing ammonium molybddophosphate with ammonium molybdate and phosphoric acid; and addition of potassium bistannite, sodium bistannite or stannous hydroxide. The heteropoly acid is carried onto diatomite or zeolite to form oxidizing catalyst suitable for use in SO2 concentration of 3-14 % and in 360-640 deg.c and reaching a total conversion rate of 99.5-99.8%. The catalyst has performance indexes near those of cesium-containing oxidizing catalyst and may be used to replace available cesium-containing oxidizing catalyst in sulfuric acid production.

Description

technical field [0001] The present invention relates to a kind of heteropolyacid and its preparation method and application, especially a kind of heteropolyacid containing phosphorus, molybdenum and tin, and the method for preparing this heteropolyacid and the use of this heteropolyacid in the preparation of oxidation catalyst application. Background technique [0002] Heteropolyacids and heteropolyacids, as a new class of catalytic materials, have received extensive attention in the field of catalytic research due to their unique acidity, "quasi-liquid phase" behavior, and strong acidity and strong oxidizing properties at the same time. [0003] At present, there are many application examples of heteropolyacids as catalysts in organic reactions. For example, Chinese Patent Publication No. 1185992 discloses a composite catalyst and USP of silica-supported phosphotungstic acid and magnesium nitrate for the production of isobutylene by ether cracking. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/19
Inventor 康喆
Owner 康喆
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