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Low carbon alkane dehydrogenation catalyst and its preparation method and application

A dehydrogenation catalyst, a technology for low-carbon alkanes, applied in the fields of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of jeopardizing the catalytic performance of the formula, the incomplete reduction of chromium, and reducing the selectivity of olefins, etc. Fewer fractions, less cracking, high selectivity

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

But just as stated in the literature (J.Phys.ChemVol.66,1962), in order to improve the selective addition of a large amount of basic oxides can endanger the catalytic performance of the formula, this is due to the strong interaction between basic oxides and chromium oxide. The interaction inhibits the dehydrogenation activity while the residual chromium with a high oxidation state cannot be completely reduced due to the addition of a large amount of alkali for stabilization, thereby reducing the selectivity to the desired olefins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of alumina carrier containing La: After mixing an appropriate amount of 0.98Mol / L aluminum trichloride solution and 0.01Mol / L lanthanum nitrate solution, add an appropriate amount of ammonia water with a mass fraction of 8%, and place it at 60-80°C Mix evenly in the neutralization tank, control the pH value to 7.0~9.0, filter, wash with water, and acidify, pressurize into balls in the oil ammonia column, dry, age, and roast at 650°C for 4 hours. Select the above-mentioned La-containing spherical alumina with a diameter of 1.0~2.0mm as the carrier to load the active component chromium, and select the precursor of chromium as chromic acid, immerse at room temperature for 5 hours, dry at 120°C for 5 hours, and bake at 600°C for 4 hours . The prepared catalyst is denoted as A, contains chromium oxide 15% by weight in the catalyst, and contains lanthanum oxide 1.2%.

Embodiment 2

[0029] Preparation of alumina carrier containing La: After mixing an appropriate amount of 0.98Mol / L aluminum trichloride solution and 0.01Mol / L lanthanum nitrate solution, add an appropriate amount of 8% ammonia water with a mass fraction of Mix evenly in the neutralization tank, control the pH value to 7.0~9.0, filter, wash with water, and acidify, pressurize into balls in the oil ammonia column, dry, age, and roast at 650°C for 4 hours. Select the La-containing spherical alumina with a diameter of 1.0-2.0mm as the carrier to load the active component chromium. The precursor of the selected chromium is chromium nitrate. After 5 hours of immersion at room temperature, it is dried at 120°C for 5 hours, and roasted at 600°C for 4 hours. Hour. The above-mentioned catalyst was loaded and immersed in copper nitrate solution, after immersing at room temperature for 5 hours, it was dried at 120°C for 5 hours, and then calcined at 600°C for 4 hours. The prepared catalyst is denoted ...

Embodiment 3

[0031]Preparation of alumina carrier containing La: After mixing an appropriate amount of 0.98Mol / L aluminum trichloride solution and 0.01Mol / L lanthanum nitrate solution, add an appropriate amount of 8% ammonia water with a mass fraction of Mix evenly in the neutralization tank, control the pH value to 7.0~9.0, filter, wash with water, and acidify, pressurize into balls in the oil ammonia column, dry, age, and roast at 650°C for 4 hours. Select the La-containing spherical alumina with a diameter of 1.0~2.0mm as the carrier to load the active component chromium. The precursor of the selected chromium is chromium acetate. After 5 hours of immersion at room temperature, it is dried at 120°C for 5 hours, and baked at 600°C for 4 hours. Hour. The catalyst was impregnated in a zinc nitrate solution for 5 hours at room temperature, then dried at 120°C for 5 hours, and calcined at 600°C for 4 hours. The prepared catalyst is denoted as D, containing chromium oxide 20% by weight in th...

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Abstract

The invention discloses a low carbon alkane dehydrogenation catalyst and its preparation method and application. The low carbon alkane dehydrogenation catalyst uses La-containing alumina as a carrier, and chromium as an active component, taking the weight content of oxides as a reference, the lanthanum oxide content in the final catalyst is 0.1 to 5.0%, the chromium oxide content is 5.0% to 20.0%, and La in the La-containing alumina carrier is introduced in during gelatinizing in the alumina preparation process. The preparation method of the low carbon alkane dehydrogenation catalyst comprises the following steps: preparation of the La-containing Al2O3 carrier and a process of loading active component chromium by an impregnation method. The low carbon alkane dehydrogenation catalyst can be used in production of propylene by dehydrogenation of propane. The low carbon alkane dehydrogenation catalyst prepared by the method does not contain alkaline oxides to avoid strong interaction between the alkaline oxides and the active component, and the activity, stability and propylene selectivity of the low carbon alkane dehydrogenation catalyst are improved.

Description

technical field [0001] The invention relates to a low-carbon alkane dehydrogenation catalyst and its preparation method and application, in particular to a catalyst for C3-C4 alkane dehydrogenation to olefins reaction and 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...

Claims

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Application Information

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