A kind of composite carrier type catalyst for producing low-carbon alcohol from syngas and preparation method thereof

A technology of composite carrier and catalyst, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problem of low alcohol selectivity of total alcohol, and improve the selectivity of total alcohol and improve the dispersion performance, enhance the effect of synergistic catalytic effect

Active Publication Date: 2022-05-20
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention proposes a composite carrier-type catalyst for low-carbon alcohols produced from syngas and a preparation method thereof, aiming at solving the problem of total alcohol selectivity and C 2 + The problem of low alcohol selectivity

Method used

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  • A kind of composite carrier type catalyst for producing low-carbon alcohol from syngas and preparation method thereof
  • A kind of composite carrier type catalyst for producing low-carbon alcohol from syngas and preparation method thereof

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preparation example Construction

[0033] The present invention also provides a method for preparing a composite carrier-type catalyst for producing low-carbon alcohols from synthesis gas. The first embodiment of the present invention includes the following steps:

[0034] Step 1, adding ethyl orthosilicate to the ethanol solution to form a mixed solution a with a weight content of 8-15% ethyl orthosilicate, impregnating the mixed solution a into carbon nanotubes in equal volumes, and dispersing Drying and roasting are carried out to obtain a composite carrier.

[0035] Specifically, due to equal-volume impregnation, the volume of the impregnating solution (mixed solution a) can be determined according to the liquid absorption and weight of the selected carbon nanotubes, for example, 50 g of carbon nanotubes and 30 mL of mixed solution a can be selected. Tetraethyl silicate is used as a silicon source to modify the surface of the carbon nanotube channels, and if the addition amount is too high, the silica will ...

Embodiment 1

[0051] (1) Preparation of composite carrier

[0052] Prepare 30 mL of ethanol solution a containing 10% tetraethyl orthosilicate, add solution a dropwise to 50 g of carbon nanotubes, stir evenly after the addition is complete, and after ultrasonic treatment for 2 to 4 hours, dry and roast under a nitrogen atmosphere to obtain a composite carrier.

[0053] (2) Catalyst preparation

[0054] Copper nitrate, cobalt nitrate, rhodium nitrate and composite carrier are weighed according to the ratio of copper: cobalt: rhodium=15:10:1, copper: composite carrier=1:5 according to the mass ratio of each component of the catalyst. Dissolve with cobalt nitrate to form a uniform mixed solution b, add the mixed solution b dropwise to the weighed composite carrier for impregnation, perform ultrasonic treatment for 2 to 4 hours after the dropwise addition, and then dry and roast under nitrogen atmosphere to obtain the catalyst Precursor A: adding catalyst precursor A to deionized water to for...

Embodiment 2

[0058] (1) The preparation of the composite carrier is the same as in Example 1.

[0059] (2) Catalyst preparation, the mass ratio of each component of the catalyst is copper:cobalt:rhodium=20:10:1, copper:composite support=1:5.5, and other conditions are the same as in Example 1.

[0060] (3) Catalyst evaluation, with embodiment 1 evaluation condition, evaluation result sees table 1 below.

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Abstract

The invention provides a composite carrier-type catalyst for producing low-carbon alcohols from syngas and a preparation method thereof. The catalyst is composed of a composition of copper, cobalt and rhodium and a composite carrier; wherein, the composition contains a copper-rhodium interface At least one of structure, cobalt-rhodium interface structure and copper-rhodium-cobalt interface structure, the composite carrier is a dual-channel structure composed of carbon nanotubes and silicon dioxide coated on its surface; copper element: cobalt element: The mass ratio of rhodium element=15~20:6~10:1; the mass ratio of copper:composite carrier=1:3~6. Introduce rhodium in the copper-cobalt catalytic system of the present invention, can synergistically catalyze, improve total alcohol selectivity and C 2 + Alcohol selectivity; by loading the copper-cobalt-rhodium composition on the dual-hole composite carrier of silica-carbon nanotubes, it is beneficial to improve the dispersion of the active components of the catalyst and facilitate the diffusion of reactant molecules in the pores, Thereby further improving the total alcohol selectivity and C 2 + Alcohol selectivity.

Description

technical field [0001] The invention relates to the technical field of preparation of low-carbon alcohols, in particular to a composite carrier-type catalyst for producing low-carbon alcohols from synthesis gas and a preparation method thereof. Background technique [0002] With the increasing consumption of petroleum resources, the energy problem continues to intensify, and it is imminent to develop a new energy system. In view of the energy structure characteristics of my country's poor oil and rich coal, it is of great strategic significance and importance to develop "green fuel" by using efficient and clean coal resource technology. Application prospects. Coal-based syngas (CO, H 2 ) technology to produce low-carbon mixed alcohols (C1~C5 alcohols), as an important part of C1 chemical industry, is an important way to synthesize liquid fuels, oil additives and bulk chemicals through non-petroleum routes. At the same time, recent studies have found that the use of methyl t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J35/00B01J35/10B01J37/02B01J37/03C07C29/158C07C31/04C07C31/08C07C31/02
CPCB01J23/8926B01J23/8946B01J23/894B01J35/109B01J37/0207B01J37/035B01J35/10B01J35/0066C07C29/158C07C31/04C07C31/08C07C31/02Y02P20/52
Inventor 杜波王会升董厚生
Owner ENN SCI & TECH DEV
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