Copper catalyst, preparation method and application thereof

Abstract

The invention relates to a copper catalyst, a preparation method and application thereof. The catalyst comprises 1-50wt% of CuCl or CuCl2, 10-90wt% of Cu and 1-50wt% of Si. The preparation method comprises the following steps: firstly, heating and melting components of the contents, rapidly cooling and curing the molten mixture, further crushing, and screening, thereby obtaining the copper catalyst. Compared with a common catalyst, the catalyst provided by the invention has the advantages of being convenient to use, relatively good in reaction working condition and Si granule matching property, relatively easy in fluidized state control in a fluidized bed reactor, having relatively good thermal stability, and having an relatively good activity.

Description

technical field [0001] The invention relates to a copper catalyst, a preparation method and application thereof. Background technique [0002] In recent years, solar energy has developed rapidly because of its cleanness, safety and abundant resources. Demand for high-purity polysilicon as a raw material for solar cells is increasing. In the mainstream process of polysilicon production, about 20t of SiCl is produced in the production of 1t of polysilicon 4 . In order to reduce the material consumption of polysilicon production, thereby reducing production costs and avoiding environmental pollution, the most effective and economical method is to use SiCl 4 Convert to SiHCl 3 , SiHCl 3 As a raw material, it returns to the polysilicon production system, thus forming a "closed-loop" production. [0003] At present, the industrial SiCl 4 Conversion to produce SiHCl 3 The mainstream technical route is SiCl 4 Cold hydrogenation, that is, under the action of certain temperat...

AI Technical Summary

Problems solved by technology

However, the existing catalysts have the following disadvantages during use: 1. The supported catalyst needs to be reduced in advance, and the catalyst residue may burn during the unloading process, which is inconvenient to use; 2. The alloy catalyst reacts in a fluidized bed Its fluidized state in the device is not easy to control; 3. CuCl or CuCl 2 It is a general-purpose catalyst in the industry, lacks the pertinence of the reaction conditions, and its particle size and density are poorly matched with Si. It is difficult to control the fluidized state in the fluidized bed reactor, and after being lost, it enters the follow-up system as an impurity, affecting the overall performance of the device. stability and economy

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