Catalyst for producing city gas with natural gas intermittent conversion and method of producing the same

A city gas and catalyst technology, which is applied to the catalyst field of natural gas steam reforming, can solve the problems of high raw material purity requirements, high raw material cost and high operating cost, and achieve the effects of high conversion activity, high resistance to carbon deposition and low cost.

Inactive Publication Date: 2011-05-11
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is normal pressure operation, huge equipment, large area occupation and high operating cost
At present, there are still devices that use this process to produce city gas, such as Shanghai Pudong Coal Gas Co., Ltd., Guangzhou Coal Gas Factory, etc.; natural gas is used as raw material, and liquefied gas is used as raw material when natural gas is insufficient. The process and the catalyst used remain unchanged. Imported from abroad, currently there is no dedicated batch conversion catalyst in China
In addition, there are also some small ammonia plants that adopt the batch conversion process. The catalysts used are generally CN-11 and CN-19 batch conversion catalysts. This type of catalyst is mainly based on Al 2 o 3 as the carrier, SiO 2 As an impurity, the content is required to be less than 0.2%, so the purity of the raw material is high, and the cost of the raw material is also high

Method used

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  • Catalyst for producing city gas with natural gas intermittent conversion and method of producing the same
  • Catalyst for producing city gas with natural gas intermittent conversion and method of producing the same
  • Catalyst for producing city gas with natural gas intermittent conversion and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, the following method is used to prepare SiO 2 -Al 2 O 3 Composite oxide carrier:

[0031] Take kaolin and alumina as raw materials, weigh kaolin (of which Al 2 O 3 With SiO 2 The mass ratio is 1:1.13)50g, Al 2 O 3 141g, after mechanical ball milling to a particle size greater than 200 mesh, add proper amount of water and roll into a ball with φ19mm. After drying, calcining at 1300℃ for 4 hours, then SiO is obtained 2 -Al 2 O 3 Composite oxide carrier. The main phase of the carrier is α-Al 2 O 3 And Al 6 Si 2 O 13 Etc. Al in the carrier 2 O 3 With SiO 2 The mass ratio is 1:0.138; the relevant physical properties of the carrier are shown in Table 1 below:

[0032] Table 1 SiO 2 -Al 2 O 3 Physical properties of composite oxide carrier

[0033]

Embodiment 2

[0035] In this embodiment, the following method is used to prepare SiO 2 -Al 2 O 3 Composite oxide carrier:

[0036] Take kaolin and alumina as raw materials, weigh kaolin (of which Al 2 O 3 With SiO 2 The mass ratio is 1:1.13)50g, Al 2 O 3 201.4g, after mechanical ball milling to a particle size greater than 200 mesh, add appropriate amount of water and roll it into a φ19mm spherical shape. After drying, calcining at 1300℃ for 4 hours, then SiO is obtained 2 -Al 2 O 3 Composite oxide carrier. The main phase of the carrier is α-Al 2 O 3 And Al 6 Si 2 O 13 Etc. Al in the carrier 2 O 3 With SiO 2 The mass ratio is 1:0.1.

Embodiment 3

[0038] In this embodiment, the following method is used to prepare SiO 2 -Al 2 O 3 Composite oxide carrier:

[0039] Take kaolin and alumina as raw materials, weigh kaolin (of which Al 2 O 3 With SiO 2 The mass ratio is 1:1.13)50g, Al 2 O 3 29.6g, after mechanical ball milling to a particle size greater than 200 mesh, add proper amount of water and roll into a ball with φ19mm. After drying, calcining at 1300℃ for 4 hours, then SiO is obtained 2 -Al 2 O 3 Composite oxide carrier. The main phase of the carrier is α-Al 2 O 3 And Al 6 Si 2 O 13 Etc. Al in the carrier 2 O 3 With SiO 2 The mass ratio is 1:0.45.

[0040] Through measurement, the physical performance indexes of the catalyst carrier obtained in Examples 2 and 3, such as the strength and water pore volume, are not much different from the corresponding indexes of the catalyst carrier obtained in Example 1.

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Abstract

The invention discloses a catalyst for preparing city gas through intermittently converting natural gas, which mainly consists of a carrier and an active component, wherein the carrier is a SiO2-Al2O3 composite oxide carrier; based on Al2O3 and SiO2, the mass ratio of the Al2O3 to the SiO2 in the carrier is 1: 0.05 - 0.50, and the phase of the carrier mainly comprises alpha-Al2O3 and Al6Si2O13; the active component is NiO; auxiliary agents are selected from one or more of Al2O3 and rare earth oxides; and the mass percentage of each component is as follows: 5 to 20 percent of the active component, and 80 to 95 percent of the carrier. The catalyst has the advantages of higher strength and wear resistance, stronger oxidation resistance, excellent heat resistance, higher carbon-separation resisting capability and conversion activity and the like. The invention also discloses a method for preparing the catalyst.

Description

Technical field [0001] The invention belongs to the technical field of catalysts for the conversion of natural gas steam, and particularly relates to a catalyst used in processes such as intermittent conversion of natural gas or liquefied natural gas to produce city gas. Background technique [0002] The steam reforming of natural gas can be roughly divided into two methods: continuous reforming and batch reforming. [0003] The batch steam reforming method, also known as the regenerative steam reforming method, uses periodic intermittent heating to supplement the reaction heat required for the natural gas reforming process. The process can be divided into two stages: the first is the blowing (heating, heat storage) stage: a part of natural gas is first used as fuel and the excess air undergoes a complete oxidation reaction in the combustion furnace to produce high-temperature flue gas at about 1300℃. The regenerative furnace enters the reformer and passes through the catalyst lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755C01B3/34
Inventor 吴且毅何洋颜智李培琛
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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