Ruthenium catalyst, preparation method and application in synthesizing tetrahydrofurfuryl alcohol

Abstract

The invention provides a ruthenium catalyst for synthesizing tetrahydrofurfuryl alcohol in one-step hydrogenation of furfural. The expression of the ruthenium catalyst is Ru-M / TiO2, wherein Ru accounts for 0.5-15 wt% of the catalyst; and M is a metal auxiliary and accounts for 0-20 wt% of the catalyst. A preparation method of the ruthenium catalyst comprises the following steps of: adding a carrier TiO2 into a water solution containing ruthenium salt or a water solution containing ruthenium salt and metal auxiliary salt such that the weight ratio of ruthenium to carrier is 0.005-0.15:1; and then, adding 2-10 wt% of potassium borohydride or hydrazine hydrate solution to precipitate the solution. A nonionic surfactant is optimally added in the preparation method to improve the catalytic activity and selectivity. If the catalyst is subject to hydro-thermal treatment in a water solution of sodium sulfate, then the adsorption property of the catalyst can be changed, and the selectivity of catalyzing furfural to synthesize tetrahydrofurfuryl alcohol through one-step hydrogenation can be greatly improved. The catalyst has simple preparation method, good catalytic activity and high selectivity and is especially applicable to catalyzing the reaction of furfural to synthesize tetrahydrofurfuryl alcohol through one-step hydrogenation under the conditions of low temperature, low pressure and no solvent. Under certain reaction conditions, the yield of tetrahydrofurfuryl alcohol can reach more than 99%.

Description

technical field [0001] The invention relates to a ruthenium catalyst, its preparation method and its application in synthesizing tetrahydrofurfuryl alcohol. Background technique [0002] Tetrahydrofurfuryl alcohol is an important chemical raw material with a wide range of uses. It can be used to prepare lysine, tetrahydrofuran, pyran and pyridine, etc. It can also be used to prepare herbicides, insecticides, antifreeze agents, plasticizers and decolorization. chemicals, etc. At present, tetrahydrofurfuryl alcohol in industry is mainly obtained by two-step hydrogenation of furfural. Wherein the first step is the hydrogenation of furfural to furfuryl alcohol, mainly using a copper-based catalyst, such as the traditional copper-chromium system disclosed in documents US2094975, CN1562477 and CN1978051 and the chromium-free systems such as copper-zinc-aluminum and copper-magnesium disclosed in documents CN1410161 and CN1256965; The yield of furfuryl alcohol can reach more than ...

AI Technical Summary

Problems solved by technology

However, in the reaction process, if the reaction temperature is low, the hydrogenation activity is low, and a very high hydrogenation pressure is required; and when the reaction temperature is raised, furfural is easy to polymerize and form carbon on the surface of the catalyst, and side reactions are prone to occur at the same time. Generate ring-opened products such as 1,2-pentanediol or 1,5-pentanediol