Sheet-shaped copper-tin alloy powder auxiliary catalyst

Abstract

The invention provides a sheet-shaped copper-tin alloy powder auxiliary catalyst. With the adoption of a constant quantity analysis, the content of Cu is 40-95 wt% and the content of Sn is 5-60 wt%; with the adoption of an ICP (Inductively Coupled Plasma) detection, Pb is less than or equal to 200 ppm, Fe is less than 500 ppm, each other metal impurity single item is less than or equal to 50 ppm, each other non-metal impurity single item is less than or equal to 30 ppm and the content of a surfactant is 0.1-10%; a hydrogen damage meter is used for detecting and the content of oxygen is less than or equal to 0.4%; a scanning electron microscope is used for detecting and the shape of a grain is in a scale shape or a slightly-coiled shape; the sheet thickness is 0.1-1.0 micron and the surface roughness of the grain is large; and a microcosmic specific surface area is large. The specific surface area is large, the purity is high and the content of harmful impurities is low; the effect of the auxiliary catalyst is better, the contact activity is improved, the selectivity of dimethyl dichloro-silane is improved and a reaction process is optimized; and the silicon powder conversion rate and the space-time yield are improved, the consumption is reduced, the cost is saved and the benefit is improved.

Description

technical field [0001] The invention relates to a catalyst, in particular to a flaky copper-tin alloy powder promoter. Background technique [0002] Organosilicon monomer is the basic raw material of the huge organosilicon industry. It is chemically synthesized by metal silicon and methyl chloride in a fluidized bed at a temperature of about 300°C by adding a catalyst (including a main catalyst and a co-catalyst). And obtain, its synthetic reaction belongs to gas-solid-solid heterogeneous contact catalytic exothermic reaction, and its reaction mechanism is complex. In addition to the main reaction, a variety of side reactions exist at the same time. Factors affecting the reaction process include fluidized bed structure, raw silicon powder, methyl chloride, catalyst, process parameters, especially the reactivity of the main catalyst and its use with the co-catalyst. Selectivity, silicon powder conversion rate and other comprehensive effects. Although the amount used is smal...

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Problems solved by technology

[0004] Usually, Sn is introduced into the fluidized bed reaction system in the form of simple granular Sn powder (or metal Sn powder) or its mixture with silicon powder. It is difficult to mix evenly with silicon powder and copper powder after the fluidized bed, and the fluidized state in the industrial fluidized bed is often prone to instability. Compared with silicon powder, a very small amount of Sn powder is easy to be carried out from the local channel or in the bed. Seriously uneven distribution, which greatly reduces the catalytic effect of Sn powder