Preparation method of a nitrogen-doped activated carbon-supported Cu catalyst and its application in catalytic furfural hydrogenation

Abstract

The invention discloses a preparation method of a nitrogen-doped activated carbon supported Cu catalyst and its application in catalytic furfural hydrogenation. The invention uses the adsorption of activated carbon to glycine and the complexation of glycine to copper ions to indirectly control the size of copper particles and complete the anchoring of copper on the carrier. Then the precursor is calcined at high temperature, and glycine is pyrolyzed to form nitrogen-doped activated carbon, and copper is reduced to cuprous and copper simple substances by nitrogen-doped activated carbon. The doping of nitrogen not only makes copper easier to reduce, but also can The dissociation energy of hydrogen is reduced, the reaction is easier to proceed, and the conversion rate of furfural is significantly improved. The complexation and nitrogen doping of glycine make the conversion and selectivity of furfural hydrogenation reach a very high level. The catalyst avoids the use of precious metals and heavy metals, is more economical and environment-friendly, and the catalyst preparation process is simple, efficient and easy to popularize.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a preparation method of nitrogen-doped activated carbon supported Cu catalyst and its application in catalytic furfural hydrogenation. Background technique [0002] At present, the commonly used furfural hydrogenation methods mainly include liquid phase hydrogenation method and gas phase hydrogenation method. In industry, gas phase hydrogenation is mostly used, and the catalyst adopts CuCr alloy catalyst. Under this catalytic system, the reaction conditions are relatively harsh (>200°C, >6Mpa), and the catalyst metal is easy to lose and cause environmental pollution. The liquid-phase hydrogenation method has the advantage of reaction at low temperature and low pressure (≤140°C, ≤2Mpa), and has become the mainstream direction of furfural hydrogenation research in recent years. Whether it is a gas-phase hydrogenation method or a liquid-phase hydrogenation method, the most...

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Problems solved by technology

However, the catalyst has a large loading of nickel and copper (nickel oxide 20-40wt%, copper 10-30wt%), and the carrier uses metal oxides, which will easily cause environmental pollution after metal loss

[0004] In summary, the CuCr catalyst used in the industrial application of furfural hydrogenation leads to high temperature and pressure required for the furfural hydrogenation reaction, high energy consumption; and the problem of metal loss is serious, which is easy to cause environmental pollution; commonly used in the liquid phase hydrogenation reaction Noble metal catalysts have higher activity and milder reaction conditions, but the cost of the catalyst is very high; nickel in non-noble metals has high activity, but its selectivity is not high; compared with nickel, although copper is used as a catalyst to ensure high selectivity, But the conversion rate needs to be improved

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