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Composite catalyst and method for preparing same

A composite catalyst, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low OH selectivity, improve dispersibility, improve yield, and increase selectivity Effect

Active Publication Date: 2019-01-04
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the above-mentioned prior art, the embodiments of the present invention provide a composite catalyst and its preparation method to solve the problem of C 2+ The problem of low OH selectivity

Method used

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  • Composite catalyst and method for preparing same
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preparation example Construction

[0037] see figure 1 , the embodiment of the present invention also provides a kind of preparation method of composite catalyst, is used for preparing composite catalyst as described above, and this preparation method comprises: according to the mass fraction of copper, iron and auxiliary agent in composite catalyst, configuration contains copper , iron and auxiliary agent solution A, adopt solution A to carry out equal volume impregnation to carrier; Process the sample obtained through equal volume impregnation, obtain catalyst precursor B; Press the mass fraction of rhodium in the composite catalyst, configure rhodium-containing Solution C, add catalyst precursor B to distilled water to form a suspension, add solution C dropwise to the suspension; add alkali solution dropwise to the sample obtained after adding solution C, so that the sample solution reaches the set pH range , to process the samples reaching the set pH range to obtain the desired composite catalyst finished p...

example 1

[0048] The preparation process of the composite catalyst is as follows:

[0049] Composite catalyst components Cu:Fe:Rh:Zn:γ-Al 2 o 3 The mass percentage is 8:5:1:5:81, 15.1g of copper nitrate trihydrate, 18g of iron nitrate nonahydrate, 4g of rhodium nitrate (35% solution), 11.4g of zinc nitrate hexahydrate, 40.5g of aluminum oxide g. Dissolve copper nitrate trihydrate, ferric nitrate nonahydrate, and zinc nitrate hexahydrate into 50 mL of deionized water to form a uniform solution A; add solution A dropwise to a medium volume of alumina for impregnation, and leave the sample for 12 hours after adding solution A; The obtained sample was vacuum-dried at 60° C. for 6 hours; calcined at 400° C. under nitrogen for 6 hours to obtain catalyst precursor B.

[0050] Catalyst precursor B was added to 200 mL of deionized water and stirred for 1 hour to form a suspension. Take 0.3 mL of concentrated nitric acid with a concentration of 68% and dilute it to 50 mL, add weighed rhodium ...

example 2

[0054] The preparation process of the composite catalyst is as follows:

[0055] Composite catalyst components Cu:Fe:Rh:Mn:γ-Al 2 o 3 The mass percentage is 10:6:0.5:2:81.5, weighs copper nitrate trihydrate 18.9g, ferric nitrate nonahydrate 21.6g, rhodium nitrate (35% solution) 2g, manganese nitrate (concentration 50% solution) 6.5g, 40.8g of alumina. Copper nitrate trihydrate, ferric nitrate nonahydrate, and manganese nitrate were dissolved in 50 mL of deionized water to form a uniform solution A; solution A was added dropwise to a medium volume of alumina for impregnation, and solution A was ultrasonically treated for 2 hours after the solution was added; the resulting sample was 90 vacuum drying at ℃ for 4 hours; calcination at 300 ℃ for 8 hours under nitrogen to obtain catalyst precursor B.

[0056] Catalyst precursor B was added to 200 mL of deionized water and stirred for 1 hour to form a suspension. Take 0.15mL of concentrated nitric acid with a concentration of 68%...

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Abstract

The invention discloses a composite catalyst and a method for preparing the same, and relates to the technical field of catalysts. By the aid of the composite catalyst and the method, the problem of low C2+OH selectivity in procedures for preparing low-carbon mixed alcohol from coal-based synthesis gas can be solved. The composite catalyst comprises, by weight, 8-16 parts of copper, 5-10 parts ofiron, 0.1-1 part of rhodium, 1-11 parts of auxiliaries and 62-85 parts of carriers. The composite catalyst and the method have the advantage that the composite catalyst can be applied to processes forpreparing low-carbon mixed alcohol from coal-based synthesis gas.

Description

technical field [0001] The invention relates to the technical field of chemical catalysts, in particular to a composite catalyst and a preparation method thereof. Background technique [0002] Coal-based syngas to low-carbon mixed alcohols (C 1 ~C 5 Alcohol) technology, as an important part of C1 chemical industry (one-carbon 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 tert-butyl ether (MTBE) as a gasoline additive will threaten human health and hinder the formation of ozone. Countries are actively exploring alternatives to MTBE. Low-carbon mixed alcohol can completely replace MTBE as a gasoline additive because of its high octane number and good blending performance with gasoline. [0003] Catalyst is the key technology involved in coal-based synthesis gas to low-carbon mixed alcohol technology. In the current catalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/02B01J37/18
CPCB01J23/894B01J23/8953B01J23/8986B01J37/0201B01J37/18
Inventor 杜波马明水王会升赵锐君李克忠
Owner ENN SCI & TECH DEV
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