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Dehydrogenation catalyst and preparation method and application thereof

A dehydrogenation catalyst, catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of high catalyst cost and achieve high activity and selectivity , less dosage, and the effect of improving the degree of reduction and utilization efficiency

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its active components are noble metals, metals are added as additives, and the catalyst cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Select spherical γ-Al with a diameter of 1.5~3mm 2 o 3 The carrier is pretreated, and the carrier is placed in the constant temperature zone of the stainless steel reactor. After the temperature is raised to 600 ° C, ammonia gas is injected at normal pressure and kept for 3 hours, and then placed in a muffle furnace and roasted at 540 ° C for 3 hours. The carrier was soaked in a mixed salt solution of potassium nitrate, manganese nitrate and copper nitrate for 24 hours, then evaporated to dryness at 70°C on a rotary evaporator, then dried at 120°C for 2 hours, and calcined at 540°C for 3 hours. The carrier was loaded with chromium oxide, and the chromium precursor selected was chromic acid. After immersion at room temperature for 5 hours, it was dried at 120° C. for 5 hours, and baked at 600° C. for 4 hours. The prepared catalyst is designated as A. In terms of mass percentage, the catalyst contains 1.0% potassium oxide, 0.5% manganese oxide, 0.5% copper oxide and 5.0...

Embodiment 2

[0027] Select spherical γ-Al with a diameter of 1.5~3mm 2 o 3 The carrier is pretreated, and the carrier is placed in the constant temperature zone of the stainless steel reactor. After the temperature is raised to 600 ° C, ammonia gas is injected at normal pressure and kept for 3 hours, and then placed in a muffle furnace and roasted at 540 ° C for 3 hours. The carrier was soaked in a mixed salt solution of potassium nitrate and zinc nitrate for 24 hours, then evaporated to dryness at 70°C on a rotary evaporator, then dried at 120°C for 2 hours, and calcined at 540°C for 3 hours. The above carrier is loaded with chromium oxide, and the precursor of chromium selected is nitric acid, soaked at room temperature for 5 hours, dried at 120° C. for 5 hours, and calcined at 600° C. for 4 hours. The obtained catalyst is designated as D. In terms of mass percentage, the catalyst contains 0.5% potassium oxide, 1.5% zinc oxide and 4.0% chromium oxide.

Embodiment 3

[0029] Select spherical γ-Al with a diameter of 1.5~3mm 2 o 3 The carrier is pretreated, and the carrier is placed in the constant temperature zone of the stainless steel reactor. After the temperature is raised to 600 ° C, ammonia gas is injected at normal pressure and kept for 3 hours, and then placed in a muffle furnace and roasted at 540 ° C for 3 hours. The carrier was soaked in a mixed salt solution of potassium nitrate, cobalt nitrate and nickel nitrate for 24 hours, then evaporated to dryness at 70°C on a rotary evaporator, then dried at 120°C for 2 hours, and calcined at 540°C for 3 hours. The above-mentioned carrier is loaded with chromium oxide, and the precursor of chromium selected is acetic acid, soaked at room temperature for 5 hours, dried at 120° C. for 5 hours, and calcined at 600° C. for 4 hours. The prepared catalyst is designated as E. In terms of mass percentage, the catalyst contains 2.5% potassium oxide, 1.0% cobalt oxide, 0.5% nickel oxide and 2.0% c...

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Abstract

The invention discloses a dehydrogenation catalyst and a preparation method and application thereof. The dehydrogenation catalyst uses ammonia processed alumina as a carrier, chrome as an active component, and one or a plurality of potassium, manganese, cobalt, iron, nickel, copper and zinc as an additive, the additive is loaded onto the carrier by a co-impregnation method, and taking oxide weight content in the final catalyst as a reference, the catalyst comprises 2%-6% of chromium oxide, and 0.1-5% of the additive. The preparation method of the hydrocarbon dehydrogenation catalyst comprises the following processes: using ammonia to preprocess an alumina carrier, using the co-impregnation method to load one or a plurality of potassium, manganese, cobalt, iron, nickel, copper and zinc, and loading the active component chrome. The dehydrogenation catalyst can be used in dehydrogenation of propane for preparation of propylene. The low carbon alkane dehydrogenation catalyst prepared by the preparation method has the advantages of low active component chromium oxide content, good propylene selectivity, high activity and the like.

Description

technical field [0001] The invention relates to a dehydrogenation catalyst and its preparation method and application, in particular to a catalyst for dehydrogenating C3-C4 low-carbon alkanes to olefins, its preparation method and application. Background technique [0002] In recent years, with the rapid development of the global petrochemical industry, the demand for low-carbon olefins is also increasing. The catalytic dehydrogenation technology of light alkanes is an effective way to increase the production of C3~C4 olefins. At present, the world's low-carbon alkane dehydrogenation patented technologies include: UOP's Oleflex process, ABB Lumms's Catofin process, ConocoPhillips (Uhde)'s Star process, Snamprogetti / Yarsintz's FBD-4 process, Linde / PDH process of BASF, etc. Among the devices already built, most of the former Soviet Union adopted the FBD-4 process, while the Catofin and Oleflex processes have become the dominant processes used in new plants. The Oleflex pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/26B01J23/86C07C11/06C07C5/333
CPCY02P20/52
Inventor 王振宇李江红张海娟张喜文
Owner CHINA PETROLEUM & CHEM CORP
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