Method and equipment for continuous preparation of metallic oxide material and catalyst

Abstract

The invention discloses a method and equipment for continuous preparation of metallic oxide and catalyst, and the preparation method comprises the following steps: dissolving metallic materials by salpeter solution to prepare metallic nitrate solution; introducing pressurization superheated vapor in metal salt solution to enable the metal salt solution to be hydrolyzed to obtain metallic oxide hydrate slurry and release NOx gas, and preparing the generated NOx gas into nitric acid for reuse; and filtering and drying the slurry to obtain the metallic oxide. The invention also discloses a method for preparing the catalyst by using the obtained metallic oxide and equipment for preparing the equipment, and the equipment comprises a metal salt preparation system, a metal salt solution hydrolysis reaction system, a product preparation system and a nitric acid preparation and recycling system. The method in the invention has the advantages of realizing continuity of the whole progress, lowering the production cost and realizing closed circulation and zero emission of the production progress.

Description

technical field [0001] The present invention relates to the technical field of catalysts and materials, more specifically, the present invention relates to methods and equipment for preparing metal oxide materials, including metal oxide hydrates and / or metal oxides and catalysts, and the methods and process equipment of the present invention are particularly It is suitable for the preparation of catalysts including Fischer-Tropsch synthesis of syngas to produce hydrocarbons and other metal oxide materials. The production method is an environment-friendly green chemical method. Background technique [0002] Metal oxides (including transition metal oxides), as the main active phase of most catalytic reactions, can usually provide the high specific surface area required for catalytic reactions, and the d and f electron bonding levels of transition metals are particularly suitable for The reactant molecules undergo chemical adsorption and activation; in addition, metal oxides a...

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Problems solved by technology

Usually the hydrothermal method is carried out in a closed pressure vessel, which requires strict control of operating conditions, otherwise the product with the expected performance cannot be obtained

[0014] However, it is generally difficult to obtain metal oxide materials with uniform particles by thermal hydrolysis of metal inorganic salt or organic metal salt solution, and it is difficult to evenly disperse additives.

[0015] The invention discloses a green method for preparing metal oxide hydrates, metal oxide materials and catalysts. The normal pressure precipitation (co-precipitation) method and the hydrothermal reaction method are organically integrated, which overcomes the harsh conditions and the need for conventional hydrothermal reaction methods. The shortcomings of being carried out in a closed container also overcome the problems of introducing one or more chemical reagents in the normal pressure co-precipitation method, which will cause a large amount of water consumption and generate a large amount of waste water and waste gas. The whole process is completely continuous, cyclic and zero. emission

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