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CO selective methanation catalyst and preparation method thereof

A methanation catalyst and selective technology, which is applied in the field of CO selective methanation catalyst and its preparation, can solve the problems that the reaction temperature is deeply affected by the gas space velocity, the catalyst reaction temperature is low, and the content of precious metals is high, so as to achieve catalyst utilization. High, catalytic activity and stability improvement, the effect of low amount of precious metal

Active Publication Date: 2012-12-19
HANERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this catalyst is that its high precious metal content leads to higher production costs
[0010] Compared with Ni-based catalysts, Ru-based catalysts have the advantages of low catalyst reaction temperature, high activity and selectivity, but the above-mentioned Ru-based catalysts have a relatively narrow reaction temperature range and their reaction temperature is deeply affected by gas space velocity.

Method used

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  • CO selective methanation catalyst and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] The catalyst evaluation method of Example 1 is as follows: the catalyst powder is pressed into tablets, then sieved, and catalyst particles of suitable size are selected and filled in a fixed-bed quartz reactor to evaluate the activity of the catalyst, wherein the reactor is a quartz tube reactor. , the inner diameter is φ16mm, the height is 700mm, and the percentage composition of dry gas in the reaction atmosphere is: H 2 75%, CO 2 18%, CO2%, air 5%, the water in the atmosphere is injected by the water pump, accounting for 10% of the total gas volume, the volume air velocity is 10000h -1 , which were evaluated under the simulated reformed gas atmosphere.

[0033]The catalyst evaluation method of Examples 2-6 is as follows: the catalyst is prepared into a monolithic catalyst and loaded into a fixed-bed quartz reactor to evaluate the activity of the catalyst, and the evaluation device and conditions are the same as above.

[0034] Example 1

[0035] A CO selective me...

Embodiment 2

[0039] A CO selective methanation catalyst, comprising an active component Ru, and a nano-cerium-zirconium composite oxide carrier, wherein the molar ratio of Ce and Zr is 1:3; the content of Ru accounts for 0.2wt% of the catalyst; characterized by TEM ,like figure 1 As shown, the particle diameter of the nano-cerium zirconium composite oxide carrier is 5-20 nm, mostly 5-10 nm. The preparation method is as follows:

[0040] (1) Dissolve the nitrate of Ce:Zr with a molar ratio of 1:3 in deionized water, and configure it into a solution with a concentration of 0.2mol / L; dilute the industrial ammonia water with a concentration of 25% by 1.5 times as a precipitant, in continuous Under stirring, the above-mentioned salt solution was added dropwise to the above-mentioned precipitating agent at a rate of 5 ml / min, and the pH was controlled to 13. After the precipitation was complete, it was aged at room temperature for 6 h, washed with deionized water for 6 times, and replaced with ...

Embodiment 3

[0044] A CO selective methanation catalyst, comprising an active component Ru, and a nano-cerium-zirconium composite oxide carrier, wherein the molar ratio of Ce and Zr is 1:6; the content of Ru accounts for 2wt% of the catalyst; like figure 1 As shown, the particle diameter of the nano-cerium zirconium composite oxide carrier is 5-20 nm, mostly 5-10 nm. The preparation method is as follows:

[0045] (1) Dissolve the nitrate of Ce:Zr with a molar ratio of 1:6 in deionized water, and configure it into a solution with a concentration of 0.2mol / L; dilute the industrial ammonia water with a concentration of 25% by 1.5 times as a precipitating agent. Under stirring, the above-mentioned salt solution was added dropwise to the above-mentioned precipitating agent at a rate of 5 ml / min, and the pH was controlled to 11. After the precipitation was complete, it was aged at room temperature for 6 h, washed with deionized water for 6 times, and replaced with anhydrous ethanol to obtain th...

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Abstract

The invention discloses a CO selective methanation catalyst and a preparation method thereof, in particular relates to a CO selective methanation catalyst which uses nanometer cerium-zirconium composite oxide as a carrier and a preparation method thereof. The CO selective methanation catalyst comprises an active ingredient Ru and the nanometer cerium-zirconium composite oxide carrier, wherein themol ratio of Ce to Zr is 1-36:6; the content of Ru is 0.2-2 wt% of the catalyst; and the particle diameter of the nanometer cerium-zirconium composite oxide carrier is 5-20nm. The CO selective methanation catalyst has good activity, has high selectivity in the whole reaction temperature area, greatly prevents the unnecessary consumption of hydrogen in reformed gas, and has simple preparation technology and relatively low cost.

Description

technical field [0001] The invention relates to a CO selective methanation catalyst and a preparation method thereof, in particular to a CO selective methanation catalyst with nano-cerium zirconium composite oxide as a carrier and a preparation method thereof. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMPC) is a power generation device that directly converts chemical energy into electrical energy by electrochemical reaction. Compared with traditional power generation devices, it has high energy conversion efficiency, no pollution, low noise and adaptability. With the advantages of different power requirements, it has broad application prospects as a fixed power supply (such as a power station) and a mobile power supply for electric vehicles, submarines, aerospace, etc. One of the forms of energy. As the fuel of PEMFC system, hydrogen mainly comes from the reforming reaction of methanol or natural gas, so 2-15% CO will inevitably remain in the hydrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63C07C1/04C07C9/04H01M4/92
CPCY02E60/50
Inventor 肖钢孙伟华周帅林
Owner HANERGY TECH
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