Mechanical catalysis method for preparing hydrogen and carbon through methane cracking

A methane gas and mechanical technology, which is applied in the field of mechanocatalysis for producing hydrogen and carbon by cracking methane, can solve the problems of high reaction energy consumption, deactivation of cracking catalyst, etc., and achieve low investment cost, prolong service life and reduce carbon deposition stacked effect

Pending Publication Date: 2022-07-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional thermocatalytic method of methane cracking cannot effectively get rid of the influence of carbon deposition in the reaction process, so the cracking catalyst is prone to deactivation due to carbon deposition blocking the catalyst pores and active sites
In addition, the operating temperatures of methane dry gas reforming and methane cracking are both higher than 1000°C, and the reaction energy consumption is high. Therefore, exploring the methane hydrogen production process under mild conditions is a research hotspot in this field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The pretreated metal nickel balls (diameter 1cm) were immersed in chloroplatinic acid (0.1M) solution for 1h ultrasonic treatment according to the ratio of 500g: 200mL solution, then the nickel balls were taken out and dried in a 90 ℃ oven for 2h, and finally The platinum-nickel alloy catalyst was synthesized by calcining nickel balls in air at 600℃ for 6h and calcining them in hydrogen at 800℃ for 6h.

[0030] Fill 300g Pt / Ni metal balls in a 2L mechanical reactor, feed 100mL / min methane gas, and react for 100h under the conditions of 400°C and 200Hz vibration frequency, the reactor pressure is 0.15MPa, and the mechanical reactor is above and below the mechanical reactor. The vibration method drives the metal alloy catalyst to generate mechanical force, the methane conversion rate is 20%, and the hydrogen selectivity is >99%.

Embodiment 2

[0032] The pretreated nickel-iron alloy balls (diameter 2cm) were immersed in chloroiridic acid (0.1M) and chloroplatinic acid (0.1M) solution for ultrasonic treatment for 1 h according to the ratio of 500g: 300mL solution, and then the nickel-iron balls were taken out and washed. After drying in an oven at 90 °C for 6 h, the nickel-iron balls were finally calcined at 650 °C in air for 6 h and calcined at 900 °C in hydrogen for 4 h to synthesize platinum-nickel alloy catalysts.

[0033] Fill 500g IrPt / NiFe metal balls in a 1.5L mechanical reactor, pass 50mL / min methane gas, and react for 100h under the conditions of 450℃ and 500Hz vibration frequency, the reactor pressure is 0.1MPa, and the mechanical reactor is The method of left and right vibration drives the metal alloy catalyst to generate mechanical force, the methane conversion rate is 40%, and the hydrogen selectivity is >99%.

Embodiment 3

[0035] The pretreated copper-iron alloy balls (diameter 3cm) were immersed in palladium nitrate (0.1M) and nickel acetate (0.1M) solution for 2h ultrasonic treatment according to the ratio of 500g: 300mL solution, and then the copper-iron balls were taken out and placed at 90 ℃. After drying in an oven at ℃ for 6 hours, the copper-iron balls were finally calcined at 700 ℃ in air for 5 h and calcined at 700 ℃ in hydrogen for 6 h to synthesize PdNi / CuFe alloy catalysts.

[0036] Fill 500g PdNi / CuFe metal balls in a 1L mechanical reactor, pass 80mL / min methane gas, and react for 100h under the conditions of 600℃ and 1000Hz vibration frequency, the reactor pressure is 0.1MPa, and the mechanical reactor is at the center The rotating shaft squeezes the grinding medium to drive the metal alloy catalyst to generate mechanical force, the methane conversion rate is 40%, and the hydrogen selectivity is >99%.

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Abstract

The invention relates to a mechanocatalysis method for preparing hydrogen and carbon through methane cracking, which is characterized in that deposited carbon on the surface of a catalyst is removed in time through mechanocatalysis, and the reaction life of the catalyst is prolonged; meanwhile, the mechanical energy can effectively activate reaction molecules, reduce the catalytic reaction energy barrier and gentle the catalytic reaction conditions; and finally, methane cracking products only comprise hydrogen and carbon, and the mechanocatalysis process of methane cracking is simple to operate and low in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by methane cracking, and particularly relates to a mechanical catalysis method for producing hydrogen and carbon by methane cracking. Background technique [0002] The disclosure of information in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] The traditional thermal catalysis method of methane cracking cannot effectively get rid of the influence of carbon deposition in the reaction process, so the cracking catalyst is prone to the phenomenon that the carbon deposition blocks the catalyst pores and active sites and deactivates. In addition, the operating temperature of methane dry gas reforming and methane cracking are both higher than 10...

Claims

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Application Information

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IPC IPC(8): C01B3/26
CPCC01B3/26C01B2203/1241
Inventor 邓伟侨于铁涂芮孙吉凯
Owner SHANDONG UNIV
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