High-load metal nickel catalyst as well as preparation method and application thereof

Abstract

The invention provides a high-load metal nickel catalyst as well as a preparation method and application thereof. The preparation method is characterized in that Ni(NO3)2.6H2O is subjected to co-precipitation with TiCl4-ethyl alcohol solution and Na2SiO3.9H2O, and water is removed under low surface tension of n-butyl alcohol, thus the high-load metal nickel catalyst which adopts SiO2-TiO2 compoundoxide as a carrier and metal nickel as an active component is prepared; the compound oxide contains TiO2, so that the L acid content is increased; moreover, B acid is generated, and as a result, themutual action between the carrier and the metal component is improved; the surface area of the catalyst is enlarged; the temperature for reduction is reduced; the reduction performance and the dispersing performance of metal nickel are improved; the quantity of active nickel sites on the surface is obviously increased; the reduction nickel particles on the SiO2-TiO2 carrier can be minimized to be4 nm under high load. Therefore, the prepared catalyst is high in low-temperature deoxidization activity, and is high in activity for o-methoxyphenol and high in selectivity to cyclohexane.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a catalyst for catalyzing the selective hydrodeoxygenation of o-methoxyphenol and a preparation method thereof. Background technique [0002] Fossil energy reserves are limited and non-renewable. At the same time, a large amount of greenhouse gases and polluting smoke will be released while consuming fossil energy, which has triggered environmental and ecological crises on a global scale. In order to get rid of the excessive dependence on fossil energy, alternative energy must be sought to alleviate the energy crisis. Biomass energy has become the first choice to replace fossil energy because of its wide range of raw materials, easy availability, and the advantages of being directly converted into liquid fuels. However, due to the complex structure of biomass and the arbitrariness of breaking bonds in the degradation process, there are many kinds of oxygenated comp...

AI Technical Summary

Problems solved by technology

In addition, the loading of metallic nickel catalyst is an important factor, because it will affect the number and acidity of active nickel sites on the catalyst surface, which in turn affects the hydrodeoxygenation activity of the catalyst. Ni catalysts with a loading of more than 50% are usually used in industrial hydrogenation processes. , however, it is currently difficult to prepare highly loaded and highly dispersed metallic nickel catalysts by simple methods