Method for preparing tungsten carbide-titanium dioxide composite catalyst

A composite catalyst, titanium dioxide technology, applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation and other directions, can solve the problems of unfavorable composite reaction of titanium dioxide and ammonium metatungstate, low utilization rate of raw materials, and high production costs , to achieve the effect of improving platinum-like catalytic activity, reducing production cost, and improving electrocatalytic performance

Active Publication Date: 2012-05-16
湖北绿钨资源循环有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But because this method has the following disadvantages: (1) the raw material titanium dioxide that adopts is solid, and the solubility of titanium dioxide in water is very little, so when titanium dioxide is dissolved in ammonium metatungstate solution, mixing is not necessarily uniform, can only make titanium dioxide-containing Ammonium metatungstate turbid liquid is not conducive to the compound reaction of titanium dioxide and ammonium metatungstate, and may also cause low utilization rate of raw materials, resulting in higher production costs; (2) The raw material titanium dioxide used is commercially available , resulting in higher production costs

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  • Method for preparing tungsten carbide-titanium dioxide composite catalyst

Examples

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Embodiment 1

[0041] A method for preparing tungsten carbide and titanium dioxide composite catalyst, comprising the following steps:

[0042] (1) Take the waste catalyst containing tungsten (acrylic acid second-stage catalyst and petroleum hydrogenation catalyst RN-1, 3581 catalyst are produced by oxidation of waste propylene), remove water, organic matter and carbon deposits, etc., and control the temperature at 600 ° C. The roasting time is 8 hours, and then it is roasted at 700°C for 8 hours until all the tungsten sulfide is oxidized to tungsten trioxide; the roasted material is cooled and pulverized, and leached with 18.5% ammonia water, the leaching temperature is 78°C, and the leaching time is 8h, until The tungsten trioxide in it is completely dissolved; the leaching solution is kept at 56°C for 10 hours to precipitate impurities such as silicon, phosphorus and iron, and then filtered, and the filtrate is ammonium tungstate solution with a concentration of 30%.

[0043] (2) It is 1:...

Embodiment 2

[0048] A method for preparing tungsten carbide and titanium dioxide composite catalyst, comprising the following steps:

[0049] (1) Take the tungsten leaching slag, remove the water, organic matter and carbon deposits, etc., the temperature is controlled at 650 ° C, the roasting time is 8 hours, and then it is roasted at 750 ° C for 8 hours; the roasted material is cooled and pulverized, and 20% Ammonia water leaching, the leaching temperature is 90°C, and the leaching time is 7.5h, until the tungsten trioxide in it is completely dissolved; the leaching solution is kept at 65°C for 10h, so that impurities such as silicon, phosphorus, and iron in it are precipitated, and then filtered. The liquid is ammonium tungstate solution.

[0050] (2) It is 1: 1 to add the hydrochloric acid that mass fraction is 25% to make suspension with titanium-containing waste material ash box material by solid-liquid ratio, add solid ammonium sulfate and mass fraction is the concentrated sulfuric a...

Embodiment 3

[0055] A method for preparing tungsten carbide and titanium dioxide composite catalyst, comprising the following steps:

[0056] (1) Take the waste catalyst containing tungsten (acrylic acid second-stage catalyst and petroleum hydrogenation catalyst RN-1, 3581 catalyst are produced by oxidation of waste propylene), remove water, organic matter and carbon deposits, etc., and control the temperature at 630 ° C. The roasting time is 8 hours, and then it is roasted at 720°C for 8 hours until all the tungsten sulfide is oxidized to tungsten trioxide; the roasted material is cooled and pulverized, and leached with 19% ammonia water, the leaching temperature is 85°C, and the leaching time is 8h, until The tungsten trioxide in it is completely dissolved; the leaching solution is kept at 60°C for 10 hours to precipitate impurities such as silicon, phosphorus and iron, and then filtered, and the filtrate is ammonium tungstate solution.

[0057] (2) It is 1: 1 to add the hydrochloric aci...

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Abstract

The invention provides a method for preparing a tungsten carbide-titanium dioxide composite catalyst. The method comprises the following steps of: preparing an ammonium tungstate solution and a titanium solution respectively from tungsten waste and a titanium-containing waste cinder box material serving as raw materials; adding an inorganic dispersant solution and an organic surfactant solution; and performing stirring heating, vacuum drying, carbonization reduction and the like to obtain the tungsten carbide-titanium dioxide composite catalyst. Due to the adoption of the method, the production cost is reduced, a good economic benefit is achieved, recycling of tungsten waste and titanium waste is facilitated simultaneously, uniform liquid-liquid mixing of a titanium liquid and the ammonium tungstate solution can be realized, and the eka-platinum catalytic activity of tungsten carbide is increased finally by using the photoelectrocatalysis performance of titanium dioxide.

Description

technical field [0001] The invention relates to the preparation of a composite catalyst, in particular to a method for preparing a composite catalyst of tungsten carbide and titanium dioxide. Background technique [0002] Since Levy RB first pointed out that tungsten carbide has a platinum (Pt) catalytic effect in 1973, researchers began to try to use tungsten carbide instead of noble metal catalysts in the field of heterogeneous catalysis and electrocatalysis. [0003] Studies have shown that tungsten carbide can catalyze synthesis gas reactions such as hydrogenation, alkane hydrogenolysis and reforming. At the same time, nano-tungsten carbide has high electrochemical activity and good catalytic effect in low-temperature acidic medium, acid resistance, high temperature resistance and CO poisoning resistance, and it shows catalytic oxidation performance for hydrogen, water and methanol oxidation. However, there is still a large gap in the catalytic activity of tungsten carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J21/06B01J37/16
Inventor 张翔谭翠丽闫梨
Owner 湖北绿钨资源循环有限公司
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