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Bifunctional catalyst for catalytic cracking of methane and its production method and hydrogen production method

A bifunctional catalyst, methane catalysis technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Realize problems such as large-scale production of hydrogen and utilization of catalyst carbon deposits, and achieve the effects of improving environmental protection and economic win-win, good mechanical and thermal stability, and high selectivity

Active Publication Date: 2017-12-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogen conversion rate of the catalyst is low, and the purpose of large-scale hydrogen production cannot be achieved.
[0013] It can be seen from the above-mentioned prior art that methane catalytic cracking catalysts are mainly used to produce carbon black products, and the function of preparing hydrogen has also been paid attention to in recent years. Utilization has always been a problem. Although carbon deposits can be used to produce functional materials such as carbon nanotubes, it is difficult to see good economic added value in the short term.
The currently used methane cracking catalysts have a low single-pass conversion rate for the catalytic cracking reaction of methane, making it difficult to achieve large-scale and efficient production of hydrogen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a bifunctional catalyst for methane catalytic cracking, which is prepared by the following steps:

[0048] Add 294.12 g of deionized water to 73.53 g of pseudoboehmite, stir well in a water bath at 80°C, add hydrochloric acid to adjust the pH value to about 3-4, and obtain a gel of the carrier;

[0049] Mix 147.6g of cobalt nitrate hexahydrate, 19.2g of phosphotungstic acid, and 20.77g of silver nitrate into the prepared gel, then add 70g of deionized water, stir evenly, and dry at 120°C for 7-10 hours , then calcined at 400°C for 3 hours, crushed and sieved after cooling to obtain a modified carrier;

[0050] Weigh 50g of the modified carrier and add it to an aqueous solution of 39.8g of cerium nitrate hexahydrate and 40g of deionized water, precipitate with ammonia water, wash and filter the precipitate, dry at 140°C for 12 hours, then roast at 600°C for 3 hours, cool and pulverize and sieve to obtain cerium-based composite metal oxide;

[005...

Embodiment 2

[0055] This embodiment provides a bifunctional catalyst for methane catalytic cracking, which is prepared by the following steps:

[0056] Add 294.12 g of deionized water to 73.53 g of pseudoboehmite, stir well in an 80°C water bath, add hydrochloric acid to adjust the pH to about 3-4, and obtain a gel;

[0057] 115.6g of Cu(NO 3 ) 2 , 10g of TiO 2 Mixed and added to the prepared gel, then added 50g of deionized water, mechanically stirred evenly, dried at 120°C for 7-10 hours, then roasted at 400°C for 3 hours, cooled, crushed and sieved to obtain a modified carrier;

[0058] Weigh 50g of the modified carrier and add it to an aqueous solution of 39.8g of cerium nitrate hexahydrate and 40g of deionized water, precipitate with ammonia water, wash and filter the precipitate, dry at 140°C for 12 hours, then roast at 600°C for 3 hours, cool and pulverize and sieve to obtain cerium-based composite metal oxide;

[0059] Weigh 50g of cerium-based composite metal oxide and add 250...

Embodiment 3

[0063] This embodiment provides a bifunctional catalyst for methane catalytic cracking, which is prepared by the following steps:

[0064] Add 201.37g deionized water to 50.37g pseudo-boehmite, stir well with 80°C water bath, add hydrochloric acid to adjust the pH value to about 3-4; add 86.12g magnesium nitrate hexahydrate to it, and then add 132.22g to Ionized water, made into a gel;

[0065] 57.8g of cobalt nitrate hexahydrate, 43.61g of ZrO 2 , 17.84gSnO 2 Mixed and added to the prepared gel, then added 70g of deionized water, mechanically stirred evenly, dried at 120°C for 8 hours, then roasted at 400°C for 3 hours, cooled, crushed and sieved to obtain a modified carrier;

[0066] Weigh 50g of the modified carrier and add it to an aqueous solution of 33.56g of cerium nitrate hexahydrate and 50g of deionized water, precipitate with ammonia water, wash and filter the precipitate, dry at 140°C for 12 hours, then roast at 600°C for 3 hours, cool and pulverize and sieve to ...

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Abstract

The invention provides a dual-function catalyst for catalytic cracking of methane, its preparation method and hydrogen production method. The general formula of the catalyst is xX.aA.yY.bB.(100-x-y-a-b)M. The preparation method of the catalyst is as follows: carrier M is mixed with metal nitrate, phosphate or oxide of component A, dried, and roasted; modified carrier is mixed with cerium nitrate, ammonia water is added, precipitated, dried, and roasted; cerium-based composite metal is oxidized The catalyst is mixed with nickel nitrate, metal carbonate, hydroxide or oxide of component B, precipitated, dried and calcined. The method adopts a circulating fluidized bed reactor and a regenerator to carry out catalytic cracking of methane to produce hydrogen, regenerate and recycle the catalyst. The catalyst can catalyze hydrogen production from methane at a lower temperature, and selectively oxidize carbon deposits into CO, which has dual functions. This method can be used for low-cost large-scale co-production of hydrogen and CO, and has the advantages of low energy consumption, high efficiency, convenient production, and good safety.

Description

technical field [0001] The invention belongs to the technical fields of chemical preparation and petroleum and natural gas chemical production, and relates to a dual-function catalyst for methane catalytic cracking and a preparation method thereof, and a method for producing hydrogen by using the catalyst to catalyze methane cracking. Background technique [0002] Hydrogen is a new type of energy, which has the characteristics of (1) abundant resources; (2) the most environmentally friendly utilization process; (3) high calorific value per unit mass, so it can be utilized in many forms and has a wide range of applications. At present, hydrogen production technologies can be divided into four categories according to the source of raw materials for hydrogen production: hydrogen production from water, hydrogen production from fossil energy, hydrogen production from biomass, and hydrogen production from solar energy. Among them, the first two types are the main hydrogen producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J23/83B01J23/835B01J23/889C01B3/26
CPCY02P20/584
Inventor 陈小博徐少军李春义杨朝合山红红
Owner BC P INC CHINA NAT PETROLEUM CORP
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