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Preparation method and application of titanium dioxide loaded ruthenium catalyst

A technology of titanium dioxide and ruthenium catalysts, which is applied in the field of high-activity supported ruthenium catalysts and their preparation, which can solve the problems of extremely high equipment and process requirements, difficulty in industrial application, and large ruthenium particle size, so as to achieve simple equipment and process and facilitate industrialization Production, effect of small particle size

Inactive Publication Date: 2012-06-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this method is that the equipment process is simple, the yield is high, and it is convenient for industrial production; the disadvantage is that the prepared ruthenium particles have a large particle size and uneven distribution.
Recently, some researchers have also reported that highly dispersed ruthenium-based catalysts have been prepared by physical sputtering, but this method requires extremely high equipment and technology, is expensive, and is difficult to achieve industrial applications.

Method used

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  • Preparation method and application of titanium dioxide loaded ruthenium catalyst
  • Preparation method and application of titanium dioxide loaded ruthenium catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] At 25°C, measure 80ml of 2.0g / L ruthenium nitrate solution into a 300ml beaker, add 5g of titanium dioxide, ultrasonicate for 10min, and magnetically stir for 20min; use 1M sodium hydroxide solution to adjust the pH value of the suspension to 6, and stir Irradiated under 250W ultraviolet light for 4 hours under the same conditions. After the reaction, the slurry was washed by centrifugation for 3 times, dried at 110°C, taken out after 10 hours, roasted in air at 400°C for 4 hours, and reduced with a mixed gas of hydrogen and nitrogen with a hydrogen volume concentration of 0.4 at 400°C for 3 hours. TiO2-supported ruthenium catalyst was obtained; it was taken out and stored in a vacuum desiccator.

[0018] Titanium dioxide is nano-mixed titanium dioxide P25.

[0019] In the prepared titania-supported ruthenium catalyst, the active component ruthenium is uniformly dispersed on the surface of the carrier titania with a nanoscale grain size.

[0020] The titanium dioxide s...

Embodiment 2

[0023] At 25°C, measure 80ml of 2.0g / L ruthenium nitrosyl nitrate solution, add 5g of titanium dioxide, ultrasonicate for 10min, and magnetically stir for 20min; use 1M sodium hydroxide solution to adjust the pH value of the suspension to 9, stirring conditions Irradiated under 650W ultraviolet light for 4h, after the reaction, the slurry was centrifugally washed 3 times, dried at 110°C, taken out after 10h, roasted in air at 400°C for 4h, and reduced at 400°C for 3h to obtain Titanium dioxide supported ruthenium catalyst; take it out and put it into a vacuum desiccator for preservation.

[0024] Titanium dioxide is nano-mixed titanium dioxide P25.

[0025] In the prepared titania-supported ruthenium catalyst, the active component ruthenium is uniformly dispersed on the surface of the carrier titania with a nanoscale grain size.

[0026] The titanium dioxide supported ruthenium catalyst prepared above is used to catalyze the hydrogenation of carbon dioxide to generate methane...

Embodiment 3

[0029] At 80°C, measure 80ml of 2.0g / L ruthenium chloride solution, add 5g of titanium dioxide, ultrasonicate for 10min, and magnetically stir for 20min; use 1M sodium hydroxide solution to adjust the pH value of the suspension to 9, and stir under Irradiated under 250W ultraviolet light for 4 hours, after the reaction, the slurry was centrifugally washed for 3 times, dried at 110°C, taken out after 10 hours, roasted in air at 550°C for 4 hours, and reduced to 200°C for 5 hours with a mixed gas of hydrogen and nitrogen with a hydrogen volume concentration of 0.4 to obtain a titanium dioxide load. Ruthenium catalyst; take it out and store it in a vacuum desiccator.

[0030] Titanium dioxide is nano-mixed titanium dioxide P25.

[0031] In the prepared titania-supported ruthenium catalyst, the active component ruthenium is uniformly dispersed on the surface of the carrier titania with a nanoscale grain size.

[0032] The titanium dioxide supported ruthenium catalyst prepared abo...

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Abstract

The invention discloses a preparation method of a low-load-capacity and high-activity load type ruthenium catalyst using titanium dioxide as a carrier. According to the invention, the titanium dioxide is used as the carrier, an ageing solution is illuminated by using ultraviolet rays in a precipitation and deposition ageing process, thus interaction of a ruthenium precursor and the titanium dioxide is enhanced, the dispersion degree of the precursor is improved, and further the high-dispersion titanium dioxide loaded ruthenium catalyst is obtained. The preparation method has the advantages of simple equipment and process, high yield, and convenience for industrialized production; and the prepared ruthenium catalyst has the advantages of small ruthenium granularity and good reproducibility. The ruthenium catalyst is applied to a process for synthesizing methane by carbon dioxide through hydrogenation, and has high reactant transformation rate, high selectivity and good stability.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a highly active supported ruthenium catalyst with titanium dioxide as a carrier and a preparation method thereof, and studies the catalytic carbon dioxide hydromethanation reaction thereof. Background technique [0002] The development of the economy has caused a large amount of carbon dioxide emissions, which has brought many problems to the global environment and climate. Therefore, how to realize the fixation and efficient use of carbon dioxide is an arduous task facing mankind. Catalytic methanation of carbon dioxide, which converts cheap carbon dioxide into useful fuel methane, has attracted extensive attention in recent years as a method to realize the effective use of carbon dioxide and promote the carbon cycle. However, due to the high thermodynamic stability and higher oxidation state of carbon dioxide, the activation and methanation reactions of...

Claims

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Application Information

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IPC IPC(8): B01J23/46C07C9/04C07C1/12
Inventor 卫敏李长明刘杰王飞段雪
Owner BEIJING UNIV OF CHEM TECH
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