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Hydrocarbon steam conversion lower-stage catalyst and preparation method thereof

A catalyst and steam technology, which is applied to the lower stage catalyst of hydrocarbon steam reforming and the field of preparation thereof, can solve the problems such as the unmentioned waste catalyst of catalytic cracking, achieve good stability of catalyst structure and activity, reduce preparation cost and high thermal stability Effect

Pending Publication Date: 2020-04-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in a method for reusing spent catalytic cracking catalysts disclosed in Chinese patent application CN106140296A, fresh catalytic cracking catalysts are prepared by in-situ crystallization using spent catalytic cracking catalysts as the main source of aluminum and part of the silicon source. However, this document does not mention how to treat the spent catalytic cracking catalyst to make it suitable as a carrier for the lower-stage catalyst of steam reforming

Method used

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  • Hydrocarbon steam conversion lower-stage catalyst and preparation method thereof
  • Hydrocarbon steam conversion lower-stage catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] RGD-1 (taken from Sinopec Catalyst Qilu Branch, 2016; contains about 34% (m / m) SiO 2 , About 53% (m / m) of Al 2 O 3 , The remainder includes iron, nickel, vanadium, sodium, etc., which can be washed away by acid.) The waste agent is soaked and washed with 30% nitric acid for 2 hours, taken out and drained, and roasted to remove carbon deposits. The latter waste agent is crushed through a 200-mesh sieve.

[0032] Weigh 872.43g of nickel nitrate, add water to dissolve it, and adjust the pH value with nitric acid to prepare a 1L nickel nitrate solution with a pH value of 2.

[0033] Mix 75 g of the roasted RGD-1 waste agent with 33.4 mL of nickel nitrate solution, stir evenly, stand for 6 hours, dry at 120°C, and then roast at 400°C for 6 hours. Then mix the above materials with 33.4 mL of nickel nitrate solution, stir evenly, stand for 6 hours, dry at 120°C, and then roast at 600°C for 4 hours to obtain semi-finished product-1.

[0034] Mix the semi-finished product-1 with 1g se...

Embodiment 2

[0039] The RGD-1 (sampling from the same batch as in Example 1) was soaked and washed with 35% nitric acid for 10 hours, taken out and drained, and roasted to remove carbon deposits. The roasting temperature was 700°C and the roasting time was 10 hours. The waste agent is crushed through a 240 mesh sieve.

[0040] Weigh 1221.40g of nickel nitrate, add water to dissolve it, and adjust the pH value with nitric acid to prepare a 1L nickel nitrate solution with a pH value of 5.

[0041] Mix 87 g of roasted RGD-1 waste agent with 12.7 mL of nickel nitrate solution, stir evenly, stand for 0.5 h, dry at 120°C, and then roast at 700°C for 1 hour. Then mix the above materials with 12.7 mL of nickel nitrate solution, stir evenly, stand for 1 hour, dry at 120°C, and then roast at 500°C for 2 hours to obtain semi-finished product-2.

[0042] Mix the semi-finished product-2 with 6g sesame powder, 1g citric acid, 5g calcium aluminate cement (calcium dialuminate phase accounted for 85%), mix well,...

Embodiment 3

[0047] The RGD-1 (sampling from the same batch as in Example 1) was soaked and washed with 10% nitric acid for 10 hours, taken out and drained, and roasted to remove carbon deposits. The roasting temperature was 600°C and the roasting time was 4 hours. The waste agent is crushed through a 220-mesh sieve.

[0048] Weigh 1017.84g of nickel nitrate, add water to dissolve it, and adjust the pH value with nitric acid to prepare a 1L nickel nitrate solution with a pH value of 2.2.

[0049] Mix 68 g of the roasted RGD-1 waste agent with 22.9 mL of nickel nitrate solution, stir evenly, stand for 3 hours, dry at 120°C, and then roast at 450°C for 3 hours. Then mix the above materials with 22.9 mL of nickel nitrate solution, stir evenly, stand for 3 hours, dry at 120°C, and then roast at 450°C for 3 hours to obtain semi-finished product-3.

[0050] The semi-finished product-3 is mixed with 4 g of sesame powder, 20 g of calcium aluminate cement (calcium dialuminate phase accounts for 75%), mix...

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Abstract

The invention belongs to the field of hydrocarbon steam conversion, and particularly relates to a hydrocarbon steam conversion lower-stage catalyst as well as a preparation method and application thereof. According to the preparation method of the catalyst provided by the invention, a waste catalytic cracking catalyst is used as a raw material and is subjected to acid treatment and roasting, a treated waste agent is used as a carrier, a nickel component is introduced through an impregnation method, and molding and aging are performed to obtain a catalyst finished product. The active componentsof the catalyst are good in dispersion in the carrier and not easy to lose, and the catalyst is good in catalyst structure and activity stability, capable of adapting to existing hydrocarbon steam conversion lower-section process conditions, long in service life, and obviously in cost advantage. According to the preparation method, the preparation cost of the catalyst is greatly reduced, a relatively effective way is found for comprehensive utilization of the waste catalytic cracking catalyst, the huge pressure of the molecular sieve waste agent on the ecological environment is effectively relieved, and the preparation method has good economic benefits and social benefits.

Description

Technical field [0001] The invention belongs to the field of hydrocarbon steam reforming, and specifically relates to a lower stage catalyst for hydrocarbon steam reforming, and a preparation method and application thereof. Background technique [0002] Hydrocarbon steam reforming is currently a hydrogen production method commonly used by domestic and foreign refining and chemical enterprises. There are three types of catalysts for the lower stage of hydrocarbon steam reforming used on a large scale in industry: pure alumina sintered catalysts, such as Z413W catalyst; calcium aluminate sintered catalysts, such as Z418 catalyst; magnesia alumina sintered catalysts, with R67 series is representative. As the lower catalyst, the general requirements are as follows: 1. High strength, able to bear the catalyst on the upper part of the furnace tube without breaking itself; 2. High activity, the lower catalyst is mainly for C1 (C1 includes CH 4 , CH x Free radicals, CO, CO 2 ) Conversio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89C01B3/40
CPCB01J29/89C01B3/40C01B2203/1058C01B2203/1082Y02P20/52
Inventor 王昊白志敏梁卫忠姜建波薛红霞齐焕东宋晓军
Owner CHINA PETROLEUM & CHEM CORP
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