Catalyst and preparation method thereof

A technology for catalysts and composite oxides, which is applied in the field of preparation of composite metal oxides, and can solve the problems of increasing carbon dioxide by-products and shortening the service life of catalysts, etc.

Active Publication Date: 2013-06-19
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Although the above-mentioned catalytic oxidation reaction at high space velocity has greatly improved the production capacity of the reaction equipment, it was found that the hot spot temperat

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preparation example Construction

[0059] The present invention also relates to a preparation method of the composition of the present invention, which comprises the following steps:

[0060] a) According to the constituent elements of the composite oxide and their content, a predetermined amount of soluble compounds of each element is provided and mixed in a solvent to form a mixed liquid

[0061] The soluble compound used to form the composite oxide of the present invention is not particularly limited, and may be any conventional soluble compound known in the art. In a better example of the present invention, the sources of each component in the composite oxide are, for example:

[0062] Molybdenum is derived from one of phosphomolybdic acid, a soluble salt of molybdic acid (such as sodium salt, potassium salt or ammonium salt) or molybdenum oxide;

[0063] Tungsten is derived from one of tungstate (such as sodium salt, potassium salt or ammonium salt) or tungsten trioxide;

[0064] Alkali or alkaline earth...

Embodiment 1

[0097] 1. Preparation of composite oxide catalyst composition

[0098] Add 3000ml of water to the beaker and heat it to 60°C, then add 1450.5g of ammonium molybdate and 6.3g of potassium nitrate, stir and dissolve to obtain solution (A), and keep the temperature at 70°C. Then, add 1300ml of water in another beaker and heat it to 50°C, then add 1109.0g of cobalt nitrate, 533.0g of nickel nitrate, and 488.9g of iron nitrate in turn, stir and dissolve, then add 30ml of nitric acid, 570.4g of bismuth nitrate, stir and dissolve to obtain a solution ( B), the temperature is kept at 65°C.

[0099] Under vigorous stirring at 70°C, add (B) solution dropwise to (A) solution, and at the same time add ammonia water to keep the pH value of the slurry at 2.5, and continue stirring until the mixture is uniform after adding. After the slurry was dried at 135°C for 18 hours, it was further treated at 210°C for 15 hours to obtain composite oxide powder.

[0100] The composite oxide powder obt...

Embodiment 2

[0104] 1. Preparation of composite oxide catalyst composition

[0105] The preparation process of the catalyst is the same as that in Example 1, except that the drying process for the preparation of the catalyst is different, drying at 155° C. for 18 hours and drying at 210° C. for 15 hours.

[0106] 2. Catalytic oxidation reaction

[0107] Get 30 grams of catalyst and pack it into a fixed-bed tubular reactor, feed a mixture of preheated propylene, air, steam and nitrogen, and the mol ratio of propylene / oxygen / water / additional nitrogen is 1: 1.6: 1.5 : 2.5, the total airspeed is 1850h -1 , the oxidation reaction was carried out under normal pressure and a reaction temperature set at 335°C, and the hot spot temperature of the bed was 385°C. After 50 hours of reaction, the conversion of propylene was 98.3%, the yield of acrolein was 84.3%, the yield of acrylic acid was 9.1%, and the yield of carbon dioxide was 2.6%.

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Abstract

Disclosed are a catalyst composition, and a preparation method and application thereof. The catalyst composition comprises the following components: a) 10-45 wt% of silicon powder; and b) 55-90 wt% of a composite oxide having a following formula of Mo12BibFecCodXeYfZgOh, wherein X is at least one element selected from the group consisting of W, Sb, As, P, Ni, Sn and Pb; Y is at least one element selected from the group consisting of Zn, Cr, Mn, Ru, Ag, Pd and Ru; Z is at least one element selected from the group consisting of alkali metals or alkaline earth metals; b is 0.1-7; c is 0.5-8; d+e is 0.5-20; f is 0-1; g is 0-2; and h is the number of oxygen atoms satisfying the oxidation state of the elements.

Description

technical field [0001] The invention relates to a composite metal oxide based on Mo-Bi-Fe-Co. The composite metal oxidant is especially suitable for partial oxidation of low-carbon unsaturated olefins to unsaturated aldehydes at high space velocity. The present invention also relates to a preparation method of the Mo-Bi-Fe-Co-based composite metal oxide. Background technique [0002] Low-carbon unsaturated acids, including acrylic acid and methacrylic acid, are important organic chemical products. They are mainly prepared industrially by two-step oxidation of olefins, that is, olefins are partially oxidized on oxide catalysts containing molybdenum and bismuth to form aldehydes. Aldehydes are further oxidized on molybdenum and vanadium oxide catalysts to generate corresponding acids. Many catalysts suitable for the oxidation of olefins to acrylic compounds have been reported in the prior art. [0003] For example, Japanese Laid-open Patent Ping 5-293389 discloses a catalys...

Claims

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Application Information

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IPC IPC(8): B01J23/887B01J23/888C07C47/22C07C45/35C07C57/05C07C51/25
Inventor 王剑李雪梅吴通好庄岩施凯敏焦昆马建学褚小东邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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