Ester hydrogenation catalyst and preparation method and application thereof

Abstract

The invention relates to an ester hydrogenation catalyst and a preparation method and application thereof. The catalyst contains 5-30% (wt) of an active ingredient, 0.1-2.5% (wt) of an assistant and a carrier, wherein the active ingredient is a Cu-Ag alloy; the assistant includes one or more of B, C, N, F, Cl or Br; the carrier is a composite oxide of r-Al2O3 and SiO2, the mass ratio of Cu to Ag is (0.1-10):1 and the mass ratio of Al to Si in the carrier is (0.1-2):1. The catalyst is prepared by adopting a coprecipitation method, and is mainly applied to reaction of ester-hydrogenated alcohol. Compared with the prior art, the ester hydrogenation catalyst has the characteristics of high activity, high orientation selectivity and good stability, and is especially suitable for industrial application.

Description

technical field [0001] The invention relates to the technical field of catalyst synthesis, in particular to an ester hydrogenation catalyst and its preparation method and application. Background technique [0002] The main research in the ester hydrogenation series is the catalytic hydrogenation of carboxylic acid esters to the corresponding alcohols, but because the carbonyl bond is not sensitive enough to nucleophilic attack, it is more difficult than the conversion of aldehydes and ketones to alcohols. Traditional ester hydrogenation catalysts are mainly noble metals, such as ruthenium, rhodium, platinum, palladium, etc., which have high catalytic activity but relatively high cost of use. Non-noble metal catalysts mainly include copper, chromium, nickel, etc., but chromium will pollute the environment. Harmful to the human body and gradually eliminated. [0003] Catalysts for the hydrogenation of acetate to ethanol, in addition to Cu / Cr series catalysts, Cu / SiO 2 The se...

AI Technical Summary

Problems solved by technology

[0002] In the ester hydrogenation series, the main research is to convert carboxylic acid esters into corresponding alcohols by catalytic hydrogenation, but because the carbonyl bond is not sensitive enough to nucleophilic attack, it is more difficult than the conversion of aldehydes and ketones into alcohols.

Traditional ester hydrogenation catalysts are mainly noble metals, such as ruthenium, rhodium, platinum, palladium, etc., which have high catalytic activity but relatively high cost of use. Non-noble metal catalysts mainly include copper, chromium, nickel, etc., but chromium will pollute the environment. Harmful to the human body, gradually eliminated

[0003] Catalysts for the hydrogenation of acetate to ethanol, in addition to Cu / Cr series catalysts, Cu / SiO 2 The series of catalysts are considered to be an ester hydrogenation catalyst with excellent reactivity, but the carrier SiO2 used in this series of catalysts 2 In the presence of alcohol, the performance is unstable, and it is very easy to undergo esterification reaction with alcohol to form silicate, thus, the carrier SiO 2 drain

CN102962071A discloses a catalyst for hydrogenation of acetate to ethanol and a preparation method thereof, which uses silicon oxide, aluminum oxide or SiO 2 -TiO 2 Composite oxide is used as a carrier, and the precursor solution of active elements is used to form a copper-containing gel, and then the gel is dried and roasted to obtain the final catalyst. Since the process of forming a gel from the catalyst precursor is slow, the catalyst preparation process is still relatively slow. slow

The currently used catalysts have the disadvantages of high catalytic hydrogenation reaction pressure and higher requirements for reaction equipment