Supported copper-manganese-water-gas shift catalyst and preparation method thereof

A technology for shifting catalysts and water gas, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve the problems of low loading, narrow active temperature range, and poor thermal stability of copper-based catalysts. Low loading, uniform pore distribution, improved catalytic activity and heat resistance

Active Publication Date: 2012-09-26
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a loaded copper-manganese water-gas shift catalyst and its preparation method, which can make full use of my country's rich bauxite resources, and prepare catalysts with high activity, high heat resistance stability, low loading capacity, and wide active temperature range. The copper-manganese composite oxide water gas shift catalyst overcomes the defects of poor thermal stability and narrow active temperature range of copper-based catalysts

Method used

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  • Supported copper-manganese-water-gas shift catalyst and preparation method thereof

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Embodiment 1

[0022] At room temperature, 4.42 g of copper acetate and 1.41 g of manganese acetate were weighed, dissolved in 400 ml of deionized water, and ultrasonically dispersed for 10 min to prepare a mixed solution. Prepare 0.5mol / L NaOH solution. Put 10 g of modified bauxite powder into a reactor equipped with a stirrer, add 300 ml of deionized water, ultrasonically disperse, and heat at a constant temperature of 80° C. to prepare a modified bauxite suspension. The mixed solution and NaOH solution were dripped into the modified bauxite suspension to keep the pH ≈ 9. After the dropwise addition was completed, the mixture was incubated for 2 hours. Filter, wash with deionized water for several times, dry at 120°C for 4h, and roast at 500°C for 6h to prepare the copper-manganese composite oxide catalyst A.

Embodiment 2

[0024] At room temperature, 3.37 g of copper nitrate and 0.58 g of manganese nitrate were weighed, dissolved in 400 ml of deionized water, and ultrasonically dispersed for 10 min to prepare a mixed solution. Prepare 0.5mol / L NaOH solution. Put 10 g of modified bauxite powder into a reactor equipped with a stirrer, add 300 ml of deionized water, ultrasonically disperse, and heat at a constant temperature of 80° C. to prepare a modified bauxite suspension. The mixed solution and NaOH solution are dripped into the modified bauxite suspension, keeping the pH ≈ 7. After the dropwise addition, the mixture was kept for 8 hours. Filter, wash with deionized water for several times, dry at 80°C for 4h, and roast at 300°C for 2h to prepare copper-manganese composite oxide catalyst B.

Embodiment 3

[0026] At room temperature, 8.04 g of copper nitrate and 2.96 g of manganese acetate were weighed, dissolved in 400 ml of deionized water, and ultrasonically dispersed for 10 min to prepare a mixed solution. Prepare 0.5mol / L KOH solution. Put 15g of modified bauxite powder into a reactor equipped with a stirrer, add 300ml of deionized water, ultrasonically disperse, and heat at a constant temperature of 80°C to prepare a modified bauxite suspension. The mixed solution and the KOH solution were dripped into the modified bauxite suspension to keep the pH ≈ 9. After the dropwise addition was completed, the mixture was incubated for 3 hours. Filter, wash with deionized water for several times, dry at 110°C for 5h, and roast at 600°C for 4h to prepare the copper-manganese composite oxide catalyst C.

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Abstract

The invention discloses a supported copper-manganese-water-gas shift catalyst and a preparation method thereof. The method comprises the following steps: enabling the copper-manganese mixed liquid and precipitator to flow in parallel for coprecipitation in a reactor in which the modified bauxite is pre-placed; ageing, filtering, drying and roasting after precipitation so as to obtain the supported copper-manganese-water-gas shift catalyst which adopts the modified bauxite as the carrier, wherein the component of the supported copper-manganese-water-gas shift catalyst is CuO and copper-manganese composite oxide. The general formula of the composite oxide is Cu(1+x)Mn(2-x)O4, wherein x is not greater than 0 and smaller than 0.6. According to the invention, the rich bauxite resource in our country is fully utilized to prepare the copper-manganese-water-gas shift catalyst which has high activity, high heat-resistant stability, low load and wide active temperature area and overcomes the shortcoming of bad heat stability and narrow active temperature area of the copper-based catalysts.

Description

technical field [0001] The invention relates to a water-gas shift catalyst, in particular to a copper-manganese water-gas shift catalyst prepared with modified bauxite as a carrier and a preparation method thereof. Background technique [0002] The water-gas shift reaction is a classic way to obtain hydrogen from water by utilizing the reducibility of CO. The research and development of shift catalysts has always been valued by researchers. The CO shift catalysts widely used in industry today mainly include iron-based high-temperature shift catalysts (300-450 °C), copper-based low-temperature shift catalysts (190-250 °C), cobalt-molybdenum-based wide-temperature sulfur-tolerant shift catalysts (190-450 °C) and noble metal catalysts. Among them, the low-temperature activity of iron-chromium-based catalysts is low, and chromium is a highly toxic substance, causing pollution and poisoning to personnel and the environment during production, use and disposal; It is necessary to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/03C01B3/16
CPCY02P20/52
Inventor 江莉龙曹彦宁马永德魏可镁
Owner FUZHOU UNIV
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