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Iron-based catalyst, preparation method and application thereof

A technology of catalysts and iron-based oxides, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve the problem of insufficient initial catalyst activity and achieve high activity , the effect of good technical effect

Active Publication Date: 2021-04-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the technical problems to be solved by the present invention is the technical problem that the initial activity of the catalyst is not high enough in the prior art, and a new catalyst for the dehydrogenation of alkylaromatics is provided

Method used

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  • Iron-based catalyst, preparation method and application thereof
  • Iron-based catalyst, preparation method and application thereof
  • Iron-based catalyst, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The preparation method of catalyst is to be equivalent to 48.39 parts of Fe 2 o 3 Iron oxide red, equivalent to 24.20 parts Fe 2 o 3 Iron oxide yellow, equivalent to 9.08 parts of CeO 2 The cerium oxalate was stirred in a kneader for 1 hour, and then the equivalent of 3.03 parts of CeO was added 2 The cerium nitrate aqueous solution was wet-kneaded for 0.6 hours, taken out, baked at 50°C for 3.5 hours, baked at 80°C for 10 hours, and then roasted at 500°C for 8 hours. After taking out, it was crushed into powder to obtain catalyst precursor I.

[0043] Catalyst precursor I, equivalent to 12.98 parts of K 2 Potassium carbonate of O, equivalent to 1.26 parts MoO 3Ammonium molybdate, calcium carbonate equivalent to 0.96 parts of CaO, 0.05 parts of MgO, 0.05 parts of ZnO and 5.0 parts of sodium carboxymethylcellulose were stirred in a kneader for 1.5 hours, and then an appropriate amount of deionized water was added for wet kneading for 0.6 hours. Take out the extrude...

Embodiment 2

[0063] The preparation method of catalyst is to be equivalent to 51.56 parts of Fe 2 o 3 iron oxide red, equivalent to 12.89 parts of Fe 2 o 3 iron oxide yellow, equivalent to 10.81 CeO 2 The cerium oxalate was stirred in a kneader for 1 hour, and then the equivalent of 5.03 parts of CeO was added 2 The cerium nitrate aqueous solution was wet-kneaded for 0.5 hours, taken out, baked at 60°C for 4.5 hours, baked at 90°C for 10 hours, and then roasted at 650°C for 5 hours. After taking out, it was crushed into powder to obtain catalyst precursor I.

[0064] Catalyst precursor I, equivalent to 13.40 parts K 2 Potassium carbonate of O, equivalent to 3.75 parts MoO 3 Ammonium molybdate, calcium carbonate equivalent to 2.45 parts of CaO, 0.12 parts of MgO and 5.0 parts of sodium carboxymethylcellulose were stirred in a kneader for 1.1 hours, and then an appropriate amount of deionized water was added for wet kneading for 0.6 hours, and the extrusion was taken out. Extrude into ...

Embodiment 3

[0067] The preparation method of catalyst is to be equivalent to 63.99 parts of Fe 2 o 3 Iron oxide red, equivalent to 16.00 parts Fe 2 o 3 iron oxide yellow, equivalent to 6.25 CeO2 The cerium oxalate was stirred in a kneader for 1 hour, and then calcined at 350° C. for 10 hours to obtain catalyst precursor I.

[0068] Catalyst precursor I, equivalent to 9.17 parts K 2 Potassium carbonate of O, equivalent to 0.77 parts MoO 3 Ammonium molybdate, calcium carbonate equivalent to 1.75 parts of CaO, 2.07 parts of MgO and 5.5 parts of sodium carboxymethylcellulose were stirred in a kneader for 1.5 hours, and then an appropriate amount of deionized water was added for wet kneading for 0.8 hours, and the extrusion was taken out. Extrude into particles with a diameter of 3 mm and a length of 5 mm, put them into an oven, bake at 80°C for 1.5 hours, bake at 120°C for 8 hours, then roast at 600°C for 6 hours, and then roast at 820°C for 5 hours to obtain a finished catalyst. The com...

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Abstract

The invention relates to an iron-based catalyst, a preparation method and application thereof, and mainly solves the technical problem that the initial activity is not high enough when alkyl aromatic hydrocarbon is dehydrogenated to generate alkenyl aromatic hydrocarbon in the prior art. According to the technical scheme, the iron-based catalyst comprises iron, potassium, rare earth metal R and other metal additive components, and satisfies the following formulas that (Fe / R) XRF=3.5-11 and (Fe / R)EDS / (Fe / R)XRF = 0.7-1.1, wherein (Fe / R)XRF is the weight ratio of the iron component to the rare earth metal component in the catalyst represented by an X-ray fluorescence spectrum in terms of elements, and (Fe / R)EDS is the weight ratio of the iron component to the rare earth metal component in the surface of the catalyst, which is characterized by an X-ray energy spectrum instrument, in terms of elements. According to the technical scheme, the technical problem is better solved, and the iron-based catalyst can be used for industrial production of alkenyl arene generated by dehydrogenation of alkyl arene.

Description

technical field [0001] The invention relates to an iron-based catalyst, a preparation method and application thereof. Background technique [0002] The research on alkylaromatic dehydrogenation catalysts began in the 1930s. At the beginning, zinc-based and magnesium-based catalysts were used, which were later replaced by iron-based catalysts with better comprehensive performance and are still in use today. The research on iron-based catalysts has also gone through multiple stages. For example, Cr was added in the early stage, and Cr was gradually eliminated due to product pollution to the environment. Substituting Ce and Mo afterwards can better improve the activity and stability of the catalyst, as disclosed in US Patent No. 3,904,552 (dehydrogenation catalyst). With the development of catalyst development, researchers have developed from many aspects to improve the personalized performance of catalysts. Disclose a kind of catalyst as U.S. Patent 6177602 (for the catalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887C07C5/333C07C15/44
Inventor 缪长喜危春玲杜建文
Owner CHINA PETROLEUM & CHEM CORP
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