Method for preparing 2, 5-dimethylfuran through catalytic hydrogenation of 5-hydroxymethylfurfural

Abstract

The invention relates to a method for preparing 2, 5-dimethylfuran through catalytic hydrogenation of 5-hydroxymethylfurfural, i.e., 5-hydroxymethylfurfural is subjected to selective hydrogenation reaction under the action of a NiFe and reduced graphene oxide composite material catalyst to generate 2, 5-dimethylfuran. The NiFe / rGO catalyst does not need to be subjected to high-temperature pre-reduction treatment before being used, reaction is carried out for 3 h under the conditions of 200 DEG C and the hydrogen pressure of 2 MPa, the conversion rate of 5-hydroxymethylfurfural can reach 100%, and the yield and selectivity of 2, 5-dimethylfuran can reach 97%. The NiFe / rGO catalyst needing no reduction pretreatment has higher catalytic activity and selectivity than Ni / rGO, Fe / rGO, NiFe / Al2O3, NiFe / HY and NiFe / SiO2 catalysts, is cheaper than noble metal catalysts such as Pt and Pd, and has industrial application value.

Description

technical field [0001] The invention relates to the field of 2,5-dimethylfuran preparation, in particular to a method for preparing 2,5-dimethylfuran by catalytically hydrogenating 5-hydroxymethylfurfural. Background technique [0002] At present, the increasing depletion of fossil resources and the greenhouse effect and air pollution caused by large-scale use have become the focus of world attention. Therefore, the development of green and efficient renewable energy has become a hot spot in future scientific research. Biomass energy is different from wind energy, water energy, tidal energy, nuclear energy and other new energy sources. It is the only renewable energy that can replace petroleum and continuously supply human hydrocarbons. It has a wide range of sources and is in line with the concept of green chemical development in the process of use. Effective integration and utilization of biomass resources can meet the energy needs of the future society and is an importan...

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Problems solved by technology

The reaction conditions are relatively mild, but Ni will be gradually oxidized and aggregated during repeated use, resulting in a sudden drop in catalyst activity

Li D, Liu Q, Zhu C, et al. Selective hydrogenolysis of 5-hydroxymethylfurfural to 2,5-dimethylfuran over Co 3 o 4 ,catalyst by controlled reduction[J].Journal of Energy Chemistry,2019,30,34-41. Co 3 o 4 , the partially reduced Co / CoO x Catalyst, at 170°C, 12h and 1MPa of H 2 Under pressure, the yield of DMF is 83.3%, but in the process of recycling, metals accumulate, and the catalyst loses its original structure, resulting in catalyst deactivation

In addition, the non-precious metal catalysts reported in the literature usually require reduction pretreatment before being put into the reaction system. The pre-reduction treatment not only complicates the catalyst preparation and maintenance process, but also increases energy consumption, and some reduced catalysts may lose their activity due to oxidation.

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