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Low-temperature high-activity nano-composite catalyst for methanation of synthesis gas and preparation method thereof

A nanocomposite and catalyst technology, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of large environmental impact and impact on catalyst performance, achieve high dispersion, improve conversion rate and selectivity, and improve activity.

Inactive Publication Date: 2015-08-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the process of preparing catalysts by the traditional precipitation method, it is necessary to carry out co-precipitation or step-by-step precipitation of the precursor solution of the carrier, active components, and additives. After filtration and multiple washings, the excess precipitant impurities can be removed, which is serious. will also affect the performance of the catalyst
A large amount of waste water will be generated during the operation, which will have a great impact on the environment

Method used

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  • Low-temperature high-activity nano-composite catalyst for methanation of synthesis gas and preparation method thereof
  • Low-temperature high-activity nano-composite catalyst for methanation of synthesis gas and preparation method thereof
  • Low-temperature high-activity nano-composite catalyst for methanation of synthesis gas and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the present embodiment comprises the following steps:

[0037] Step 1. Weigh 42.8ml of tetrabutyl titanate and mix with 128.4ml of absolute ethanol, and stir evenly to obtain tetrabutyl titanate ethanol mixed solution;

[0038] Step 2: Mix 85.6ml of deionized water with 85.6ml of absolute ethanol, add glacial acetic acid to control the pH between 3 and 4, and obtain a mixed aqueous solution of ethanol and acetic acid;

[0039] Step 3. At room temperature, use a peristaltic pump to slowly drop the ethanol-acetic acid mixed aqueous solution into the tetrabutyl titanate ethanol mixed solution, stir vigorously to hydrolyze the tetrabutyl titanate, and continue stirring for 3 hours to obtain a sol;

[0040] Step 4. Slowly add 0.9g γ-Al to the obtained sol at 80°C 2 o 3 The carrier, the sol gradually loses its fluidity and forms a gel, which is dried at a constant temperature of 100°C for 24 hours to remove moisture, organic groups and organic solv...

Embodiment 2

[0045] The preparation method of the present embodiment comprises the following steps:

[0046] Step 1. Weigh 42.8ml of tetrabutyl titanate and mix with 128.4ml of absolute ethanol, and stir evenly to obtain tetrabutyl titanate ethanol mixed solution;

[0047] Step 2: Mix 85.6ml of deionized water with 85.6ml of absolute ethanol, add glacial acetic acid to control the pH between 3 and 4, and obtain a mixed aqueous solution of ethanol and acetic acid;

[0048] Step 3. At room temperature, use a peristaltic pump to slowly drop the ethanol-acetic acid mixed aqueous solution into the tetrabutyl titanate ethanol mixed solution, stir vigorously to hydrolyze the tetrabutyl titanate, and continue stirring for 3 hours to obtain a sol;

[0049] Step 4. Slowly add 0.9g γ-Al to the obtained sol at 80°C 2 o 3 The carrier, the sol gradually loses its fluidity and forms a gel, which is dried at a constant temperature of 100°C for 24 hours to remove moisture, organic groups and organic solv...

Embodiment 3

[0054] The preparation method of the present embodiment comprises the following steps:

[0055] Step 1. Weigh 42.8ml of tetrabutyl titanate and mix with 128.4ml of absolute ethanol, and stir evenly to obtain tetrabutyl titanate ethanol mixed solution;

[0056] Step 2: Mix 85.6ml of deionized water with 85.6ml of absolute ethanol, add glacial acetic acid to control the pH between 3 and 4, and obtain a mixed aqueous solution of ethanol and acetic acid;

[0057] Step 3. At room temperature, use a peristaltic pump to slowly drop the ethanol-acetic acid mixed aqueous solution into the tetrabutyl titanate ethanol mixed solution, stir vigorously to hydrolyze the tetrabutyl titanate, and continue stirring for 3 hours to obtain a sol;

[0058] Step 4. Slowly add 0.9g γ-Al to the obtained sol at 80°C 2 o 3 The carrier, the sol gradually loses its fluidity and forms a gel, which is dried at a constant temperature of 100°C for 24 hours to remove moisture, organic groups and organic solv...

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Abstract

The invention discloses a low-temperature high-activity nano-composite catalyst for the methanation of a synthesis gas and a preparation method thereof. The catalyst comprises an active component, a carrier and a coagent, wherein the active component is nickel, the carrier is TiO2(Titanium Oxide) / [lambda]-Al2O3 (Alumina Oxide), and the coagent is metallic iron; the nickel and the metallic iron are in the present of the catalyst in a ferro-nickel way; and the catalyst comprises the following components in parts by weight: 5-30% of NiO (Nickel Oxide), 40-70% of [gamma]-Al2O3, 5-15% of TiO2 and 5-30% of Fe2O3 (Ferric Oxide). When the TiO2 / gamma]-Al2O3 composite carrier is prepared by the method provided by the invention, the nano-scale TiO2 prepared by a sol-gel method has the advantages of high surface uniformity, high dispersion and best heat stability, in comparison with titanium dioxide, which is easy to cluster and agglomerate, obtained by the impregnation and calcinations of titanium nitrate and the like through a traditional impregnation method.

Description

technical field [0001] The invention relates to a low-temperature high-activity nano-composite catalyst for syngas methanation and a preparation method thereof, belonging to the technical field of catalysts and preparation methods thereof. Background technique [0002] As a country that is rich in coal, poor in oil, and has gas, China's coal resources account for a large proportion of the entire energy structure. At the same time, a large part of my country's coal resources is low-quality lignite, which has a low direct utilization rate and pollutes big. Lignite is gasified into syngas to provide raw materials for downstream coal-to-natural gas, coal-to-methanol, and coal-to-oil. Among them, the coal-to-natural gas process (SNG) has a high total heat utilization efficiency (over 50%) and a unit calorific value Low investment cost, high CO conversion rate (nearly 100%), high utilization rate of waste heat (additional production of high-temperature and high-pressure steam), ea...

Claims

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Application Information

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IPC IPC(8): B01J23/755C10L3/08
Inventor 沈德魁程崇博肖睿
Owner SOUTHEAST UNIV
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