Method for catalyzing oriented conversion of cellulose into composite carbon source by using nickel-doped copper-aluminum hydrotalcite catalyst

Abstract

The invention provides a method for catalyzing oriented conversion of cellulose into a composite carbon source by using a nickel-doped copper-aluminum hydrotalcite catalyst. The catalyst is a three-metal mixed oxide catalyst, copper-aluminum hydrotalcite is used as a skeleton, nickel atoms are located on a specific copper-aluminum laminate structure, and the catalyst has rich acidic and alkaline catalytic sites. The nickel-doped copper-aluminum hydrotalcite catalyst can be used for catalyzing oriented conversion of cellulose into the composite carbon source (wherein crude methanol, levoglucosenone and carboxylic acid are recovered). The nickel-doped copper-aluminum hydrotalcite catalyst provided by the invention is simple in preparation process and beneficial to industrialization, and has the advantages of complete crystal phase structure, multiple acid-base catalysis sites, high catalysis efficiency, strong anti-coking performance and good stability; and when the catalyst is used for catalyzing pyrolysis of the cellulose, a function of directionally converting the cellulose into the composite carbon source can be realized, and the yield and the product value of the composite carbon source are improved.

Description

technical field [0001] The invention belongs to the technical field of novel industrial catalytic aids, in particular to a method for catalyzing directional transformation of cellulose into a composite carbon source by a nickel-doped copper-aluminum hydrotalcite catalyst. Background technique [0002] Among all kinds of renewable energy, due to the potential ecological and environmental risks of nuclear energy and large-scale hydropower, and the constraints of regional resources such as wind energy and geothermal energy, vigorous development has been restricted and questioned, while biomass energy is characterized by ubiquity, abundance, Features such as reproducibility are recognized. The uniqueness of biomass is not only that it can store solar energy, but also that it is a renewable carbon source that can be converted into conventional solid, liquid, gaseous fuels, coal, oil, natural gas and other energy sources. transformed. Biomass energy is an important part of renew...

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Problems solved by technology

[0004] In the Chinese patent database, the patents related to biomass pyrolysis, catalyst preparation and application include patent publication number CN112063400A "An integrated method for preparing carbon-based composite materials by catalytic pyrolysis of straw carbon base" and patent publication number CN112010725A "A Method for Preparing Single-ring Aromatic Hydrocarbons by Catalyzing Cellulose Pyrolysis with Ruthenium Modified Molecular Sieve", Patent Publication No. CN112007687A "A Catalyst Modification Method for Improving the Yield of Biomass Catalytic Pyrolysis Hydrocarbons", Patent Publication No. CN111939980A "A Method for Preparation of MOF Skeleton Catalyst for Catalytic Pyrolysis of Biomass", etc. The methods involved in these patents have their own characteristics, but the processes are relatively complicated, and the value of the prepared products is low. The overall process High cost, failed to achieve industrialization

At the same time, the catalysts used in the prior art, such as zeolite molecular sieves, alumina, copper-based catalysts, etc., have achieved better methanol yields, but the methanol quality is low and contains more other condensable gases, and the catalyst stability is low , easy to coke inactivation

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