Catalyst for reforming methane and carbon dioxide to prepare synthesis gas, and preparation method for catalyst

A carbon dioxide and catalyst technology, applied in the field of catalyst for methane carbon dioxide reforming to syngas and its preparation, can solve the problems of low space velocity, high test conditions, clogging of the reactor, etc., and achieves high catalytic oxidation efficiency, good stability, Effects of high oxygen storage capacity and structural stability

Inactive Publication Date: 2016-01-06
NAT UNIV OF SINGAPORE SUZHOU RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Both noble metals represented by rhodium and non-precious metals represented by nickel have good activity for methane dry gas reforming reaction, but nickel catalysts are prone to generate a large amount of carbon deposits and cause reactor blockage
Judging from the current research results, the problem of carbon deposition and deactivation of nickel catalysts is basically unavoidable, so there is still a long way to go for long-term high-temperature industrial use of nickel catalysts to achieve methane dry gas reforming reactions (Chinese patent CN103586030A)
Although Chinese patent CN102745648A has reported a long-lived nickel catalyst, its test conditions are too high and the space velocity is also low

Method used

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  • Catalyst for reforming methane and carbon dioxide to prepare synthesis gas, and preparation method for catalyst
  • Catalyst for reforming methane and carbon dioxide to prepare synthesis gas, and preparation method for catalyst

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Embodiment 1

[0042] This embodiment is a catalyst for reforming methane and carbon dioxide to produce synthesis gas. The composition and mass percentage of the catalyst are: metal iridium 2%, cerium oxide-based solid solution 98%. The preparation method is as follows:

[0043] (1) 2.42g of cerium nitrate and 0.27g of praseodymium nitrate are added to 500mL of distilled water for dissolving in 500mL of distilled water at a ratio of 9:1 by cerium to praseodymium nitrate to obtain a mixed solution;

[0044] (2) The mixed solution was heated and hydrolyzed at 90°C for 5h, filtered, washed and dried at 100°C, and then roasted at 400°C for 4 hours to obtain a ceria-praseodymia solid solution;

[0045] (3) Add cerium oxide-praseodymium oxide solid solution powder into distilled water, stir and disperse, and add chloroiridic acid solution containing 0.02g of iridium, then heat to 65-75°C, and slowly add 0.1mol / L sodium carbonate or Sodium bicarbonate solution to solution pH = 8-9, aging for 2-4 h...

Embodiment 2

[0050] This embodiment is a catalyst for reforming methane and carbon dioxide to produce synthesis gas. The composition and mass percentage of the catalyst are: metal iridium 2%, cerium oxide-based solid solution 98%. The preparation method is as follows:

[0051] (1) 2.42g of cerium nitrate and 0.25g of lanthanum nitrate are added to 500mL of distilled water for dissolving in 500mL of distilled water according to the molar ratio of cerium to lanthanum and 0.25g of lanthanum nitrate, then add 50g of urea to obtain a mixed solution;

[0052] (2) The mixed solution was heated and hydrolyzed at 90°C for 5 hours, filtered, washed and dried at 100°C, and then roasted at 400°C for 4 hours to obtain a cerium oxide-lanthanum oxide solid solution;

[0053] (3) Add cerium oxide-lanthanum oxide solid solution powder into distilled water, stir and disperse, and add chloroiridic acid solution containing 0.02g of iridium, then heat to 65-75°C, and slowly add 0.1mol / L sodium carbonate or So...

Embodiment 3

[0058] This embodiment is a catalyst for reforming methane and carbon dioxide to produce synthesis gas. The composition and mass percentage of the catalyst are: metal iridium 2%, cerium oxide-based solid solution 98%. The preparation method is as follows:

[0059] (1) 2.42g of cerium nitrate and 0.14g of zirconium oxynitrate are added to 500mL of distilled water for dissolving in 500mL of distilled water according to the molar ratio of cerium to zirconium of 9:1, and then 50g of urea is added to obtain a mixed solution;

[0060] (2) Heating and hydrolyzing the mixed solution at 90°C for 4 hours, filtering, washing and drying at 100°C, and then roasting at 400°C for 4 hours to obtain a ceria-zirconia solid solution;

[0061] (3) Add cerium oxide-zirconia solid solution powder into distilled water, stir and disperse, and add chloroiridic acid solution containing 0.02g of iridium, then heat to 65-75°C, and slowly add 0.1mol / L sodium carbonate or Sodium bicarbonate solution to so...

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Abstract

The invention discloses a catalyst for reforming methane and carbon dioxide to prepare synthesis gas. The catalyst is prepared from the components in percentage by mass: 2-3% of metal iridium and 97-98% of a cerium oxide-based solid solution, wherein the cerium oxide-based solid solution is pure cerium oxide, a cerium oxide-lanthanum oxide solid solution, a cerium oxide-praseodymium oxide solid solution, a cerium oxide-zirconium oxide solid solution or a cerium oxide-titanium oxide solid solution. According to the invention, the catalyst for reforming methane and carbon dioxide to prepare synthesis gas is prepared through a simple deposition-precipitation, coprecipitation or sequential precipitation method, and the catalyst shows the characteristic of high catalytic efficiency in reforming reaction of dried methane gas at 750-800 DEG C, and has relatively good stability.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for producing synthesis gas by reforming methane and carbon dioxide and a preparation method thereof. Background technique [0002] Methane (CH 4 ) is the main component of natural gas and one of the most stored fossil energy sources in nature. It is an important carrier of human energy utilization at present. The activation and conversion of methane has become a hot topic in the field of energy research by governments and scientists in various countries. The technology of converting methane into synthesis gas or hydrogen represented by water vapor reforming, partial oxidation and dry gas reforming has become a hot topic in methane conversion research. Since the dry gas reforming reaction can theoretically obtain a synthesis gas with a molar ratio of hydrogen and carbon monoxide of 1:1, which is beneficial to the next step of the Fischer-Tropsch synthesis process to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J37/03C01B3/40
CPCB01J21/06B01J23/468B01J23/63B01J37/03B01J37/031B01J37/038C01B3/40C01B2203/0238C01B2203/1041C01B2203/1241Y02P20/141Y02P20/52
Inventor 王发根陈伟许国勤
Owner NAT UNIV OF SINGAPORE SUZHOU RES INST
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