Low-temperature copper-based core-shell catalyst for preparing methanol through CO2 hydrogenation and preparation method thereof

Abstract

The invention discloses a low-temperature copper-based core-shell catalyst for preparing methanol through CO2 hydrogenation and a preparation method of the low-temperature copper-based core-shell catalyst. The copper-based core-shell catalyst is prepared by taking a copper-zinc oxide hollow sphere as a metal framework through a sol-assisted method. The preparation method of the catalyst is simple, conditions are easy to control, the repeatability is good, and the preparation cost is low. According to the catalyst disclosed by the invention, due to close contact between the core and the shell, the interaction between the core and the shell is increased, and complementary chemical properties are formed, so that the bonding strength of CO2 and the catalyst is promoted, and the catalyst has relatively low reaction temperature, relatively high catalytic activity and relatively high methanol selectivity in the process of catalyzing CO2 hydrogenation to prepare methanol.

Description

technical field [0001] The invention belongs to the field of catalysts and relates to a 2 A low-temperature copper-based core-shell catalyst for methanol hydrogenation and a preparation method thereof. Background technique [0002] Methanol is an important clean liquid fuel or hydrogen carrier. Renewable energy H from water electrolysis in a sustainable methanol economy 2 . Driving CO by thermocatalysis 2 Selective conversion to methanol is an effective way to achieve a carbon-neutral energy cycle. [0003] Copper-based catalysts can convert synthesis gas (CO / CO 2 / H 2 ) catalytic conversion to methanol, with relatively low cost and good activity, has become a global catalytic research hotspot. Copper-based catalysts used in commercial methanol synthesis developed by ICICo.Ltd operate at high temperature (553-573K) and high pressure (8-10MPa) to obtain sufficient catalytic activity. Although the increase of reaction temperature is beneficial to the increase of cataly...

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Problems solved by technology

However, a decrease in the reaction temperature leads to CO 2 The conversion rate is significantly reduced (Santana CS et al. Industrial&Engineering Chemistry Research 2021)

In addition, Bansode et al. prepared methanol by increasing the reaction pressure (10.0 MPa) and lowering the reaction temperature (200°C), and found that the increase in reaction pressure was conducive to the formation of methanol, but the corresponding CO 2 The conversion rate is only 2.8% (BansodeAetal. CatalSciTechnol 2013; 3(3):767-78)

[0004] Porous metal oxide hollow sphere catalysts have the advantages of high specific surface area, low density and large loading capacity per unit volume, but there are only reports on their application to gas sensitivity, such as SnO 2 Hollow spheres (Sun X et al.Chemistry2006; 12(7):2039-47), the catalyst preparation process is cumbersome, time-consuming, waste of materials, etc.

In addition, impregnating carbon microspheres with different nitrate concentrations is not only costly, uneconomical, and time-consuming, but also very challenging to control the morphology of metal oxides (Li S et al. Chemical Engineering Journal 2019; 372:53 -64.)

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