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A kind of preparation method of ethylene oxidative dehydrogenation catalyst

A technology for oxidative dehydrogenation and catalysts, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, molecular sieve catalysts, etc. The effect of avoiding further oxidation, improving conversion rate and ethylene selectivity, and reducing catalyst cost

Active Publication Date: 2018-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the catalysts prepared by the above-mentioned patented methods have obtained good performance in the oxidative dehydrogenation of ethane to ethylene, because the reaction is a fast reaction (this fast reaction is generally carried out under the condition of mass transfer control), The reaction is completed when the reactant reaches the outer surface of the catalyst, so the inner surface of the catalyst does not contribute much to the target reaction, which results in lower metal utilization in the carrier pores, increases the cost of the catalyst, and accelerates the production rate of the product. deep oxidation of

Method used

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  • A kind of preparation method of ethylene oxidative dehydrogenation catalyst
  • A kind of preparation method of ethylene oxidative dehydrogenation catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Weigh 1.1g of ammonium molybdate and 1.98g of nickel nitrate and dissolve them in an appropriate amount of deionized water to obtain solution A; adopt the equal volume impregnation method to load on 20g of alumina (the pore volume is 0.72ml / g, the specific surface area is 242m 2 / g, strip shape, equivalent diameter 1.5mm) carrier, aged at room temperature for 4h, dried at 80°C for 12h, and calcined at 700°C for 4h to obtain catalyst precursor B, in which Mo accounted for 3% of the weight of the support by element, and Ni by element Accounting for 2% of the weight of the carrier; catalyst precursor B is activated in a mixed atmosphere containing hydrogen, the volume content of hydrogen in the mixed gas is 80%, the reduction condition is 450 ° C, 0.2 MPa (absolute pressure), and the reduction time is 4 hours; after the reduction activation The catalyst precursor B and 300mL of sorbitol solution with a mass concentration of 10% were added to the autoclave, sealed and replac...

Embodiment 2

[0030] Weigh 1.1g of ammonium molybdate and 1.98g of nickel nitrate and dissolve them in an appropriate amount of deionized water to obtain solution A; use equal volume impregnation method to load 20g of silicon oxide (pore volume is 1.06ml / g, specific surface area is 387m 2 / g, spherical shape, equivalent diameter 0.5mm) carrier, aged at room temperature for 4h, dried at 80°C for 12h, and calcined at 700°C for 4h to obtain catalyst precursor B, in which Mo accounted for 3% of the support weight by element and Ni accounted for The weight of the carrier is 2%; the catalyst precursor B is activated in a mixed atmosphere containing hydrogen. Catalyst precursor B and 300mL sorbitol solution with a mass concentration of 10% were added to the autoclave, sealed and replaced with hydrogen for 3 times, then adjusted the hydrogen pressure to 3MPa, and reacted at 220°C for 4h; The final mixture was placed for 2h, filtered, and the resulting solid sample was dried at room temperature unti...

Embodiment 3

[0032] Weigh 1.1g of ammonium molybdate and 1.98g of nickel nitrate and dissolve them in an appropriate amount of deionized water to obtain solution A; use an equal volume impregnation method to load 20g of hydrogen-type ZSM-5 (silicon-aluminum ratio 50, pore volume 0.23ml / g, The specific surface area is 426m 2 / g, strip shape, equivalent diameter 1.5mm) carrier, aged at room temperature for 4h, dried at 80°C for 12h, and calcined at 700°C for 4h to obtain catalyst precursor B, in which Mo accounted for 3% of the weight of the support by element, and Ni by element Accounting for 2% of the weight of the carrier; catalyst precursor B is activated in a mixed atmosphere containing hydrogen, the volume content of hydrogen in the mixed gas is 80%, the reduction condition is 450 ° C, 0.2 MPa (absolute pressure), and the reduction time is 4 hours; after the reduction activation The catalyst precursor B and 300mL of sorbitol solution with a mass concentration of 10% were added to the a...

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Abstract

The invention relates to a preparation method of a catalyst for oxidative dehydrogenation of ethane to produce ethylene. The catalyst includes an active component, a first auxiliary agent, a second auxiliary agent and a carrier. The preparation method first prepares the active component precursor and the second auxiliary agent An auxiliary agent precursor is dissolved in water to obtain a solution A; then a carrier is added to obtain a catalyst precursor B after aging, drying, and roasting; a reducing atmosphere is used to reduce the catalyst precursor B; the reduced catalyst precursor B and the polyol solution are added to the reactor for hydrogenation reaction, the reaction effluent is placed, then filtered and dried to obtain the catalyst precursor C; the active component precursor and the second auxiliary agent precursor are dissolved in water to obtain the solution D , and then add the catalyst precursor C, after drying and roasting, the catalyst is obtained. The method of the invention promotes the dispersion of more active components on the carrier surface, not only improves the utilization rate of active metals, but also improves the conversion rate of ethane and the selectivity of ethylene.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for oxidative dehydrogenation of ethane to prepare ethylene, in particular to a preparation method of a supported nickel-based catalyst for preparation of ethylene by oxidative dehydrogenation of ethane. Background technique [0002] Ethylene is an important petrochemical basic raw material, which is mainly produced by cracking alkanes such as ethane. Compared with pyrolysis, oxidative dehydrogenation of ethane to ethylene (ODHE) is a low-energy pathway with great application prospects, and is one of the research hotspots in the field of catalysis in recent years. [0003] The research on catalysts for oxidative dehydrogenation of ethane to ethylene involves catalysts of several systems: alkaline earth metal oxide systems, rare earth metal oxide systems, supported noble metal catalyst systems, and transition metal oxide systems. [0004] CN1121844A discloses a catalyst and process for produci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J29/48B01J23/888C07C11/04C07C5/48
CPCY02P20/52
Inventor 孙晓丹张舒冬张信伟刘继华
Owner CHINA PETROLEUM & CHEM CORP
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