Catalyst for preparing ethanol through hydrogenation of acetic acid as well as preparation method and application thereof

Abstract

The invention belongs to the technical fields of a catalyst for preparing ethanol through catalytic hydrogenation of acetic acid and application thereof and aims at providing a catalyst for synthesizing ethanol through efficient catalysis and hydrogenation of acetic acid as well as a preparation method and application thereof. The adopted technical scheme is as follows: the catalyst for preparing ethanol through catalytic hydrogenation of acetic acid comprises an active component and a carrier, wherein the active component consists of a first active component and a second active component; the first active component comprises VIII noble metals such as Pd, Pt, Ru and Rh and metal oxides such as MoO3, WO3, CuO and Re2O7; the second active component comprises one of Zn, Cr, Sn, Co, Ni, Ce and OsO4; and the carrier is one of SiO2, Al2O3 and activated carbon. According to the invention, ethanol is synthesized by hydrogenation of acetic acid; two groups of active metals are used as a co-catalyst for concerted catalysis; the noble metals are reduced or not used in the preparation of the catalyst; and in the hydrogenation reaction of acetic acid, the reaction activity is extremely good and the selectivity is high.

Description

Technical field [0001] The invention belongs to the technical field of catalysts for preparing ethanol by acetic acid catalytic hydrogenation and applications. Background technique [0002] Ethanol is widely used and is an important raw material and solvent for many industrial products. With the development of science and technology, the shortage of fuel and energy has become increasingly serious. In recent years, with the rapid development of my country’s economic construction, the consumption of petroleum-based fuel energy products has been accelerating, the demand has been increasing, and the shortage of raw materials has become increasingly prominent. The use of ethanol as automobile fuel can greatly reduce the burning time of gasoline. Pollution to the environment, and ethanol is recognized as the safest automotive fuel in the world that can be supplied to the market on a larger scale. It is estimated that 60% of the world's ethanol production is used as automotive fuel. [0...

AI Technical Summary

Problems solved by technology

[0005] For a long time, acetic acid is an oxide of ethanol. In theory, choosing a suitable catalyst can hydrogenate the carboxyl group to obtain ethanol, but in general, it is difficult to carry out the hydrogenation reaction of acetic acid. There are many catalysts, such as copper chromite or modified catalysts, The reaction requires a high temperature of 250°C and a high pressure of 30 MPa, and there are a large number of ester by-products, etc., the reaction rate and product yield are low

Strong reducing agent NaBH 4 The reaction can be carried out, but the catalyst lacks use value in homogeneous catalysis

The use of catalysts such as noble metals Pt or Re can appropriately increase the reaction rate and yield, such as the catalyst used in the technology disclosed in U.S. Patent US2010 / 0197985 is Ca / Pt / Sn / SiO 2 When catalyzing acetic acid to produce ethanol, the selectivity of ethanol is preferably 90%, while the conversion rate of acetic acid is only 72%. This method uses precious metals, which are expensive and the yield is low. Therefore, this method lacks industrial value, and it is urgent to improve its catalytic performance.

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