Iron-molybdenum composite metal oxide catalyst and preparation method and application thereof

A composite metal and oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, carbon compound catalysts, physical/chemical process catalysts, etc., can solve potential safety hazards in mixing, increase difficulty, and low propylene selectivity and other problems, to achieve the effect of low price, simple operation, high activity and selectivity

Inactive Publication Date: 2019-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxidative dehydrogenation (ODH) is another production process of propane to propylene. Although ODH is an exothermic reaction, it breaks the thermodynamic limit of the reaction, and the reaction temperature is lower, which also reduces the influence of carbon deposition on the catalyst. Howe

Method used

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  • Iron-molybdenum composite metal oxide catalyst and preparation method and application thereof
  • Iron-molybdenum composite metal oxide catalyst and preparation method and application thereof
  • Iron-molybdenum composite metal oxide catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Step 1, according to the mol ratio of iron and molybdenum, in 2ml deionized water, add the ammonium molybdate of certain quality ((NH 4 ) 6 Mo 7 o 24 .4H 2 O), after dissolving completely, add 3.4g ferric nitrate nonahydrate (Fe(NO 3 ) 3 .9H 2 O), form a uniform mixed solution, the Al of 1.0g 2 o 3 Dip into the above solution.

[0048] Step 2, place the slurry obtained in step 1 at room temperature for 12 hours, then dry at 80°C for 12 hours, grind the obtained blocky solid, and bake it in air at 600°C for 6 hours to obtain the supported iron The molybdenum composite metal oxide catalyst has a molecular formula of 1MoxFeAl, where x=3, 6, 9, 12, 15, representing the molar ratio of iron and molybdenum.

[0049] In step 3, the 1MoxFeAl solid powder is pressed into tablets and sieved to obtain catalyst particles of 20-40 mesh.

Embodiment 2

[0051] Step 1, get 3.4g ferric nitrate nonahydrate (Fe(NO 3 ) 3 .9H 2 O) Added to 2ml of deionized water, after obtaining a clear solution, added 1.0g of Al 2 o 3 Do the impregnation.

[0052] Step 2, after drying the product obtained in step 1 at room temperature and 80°C for 12 hours, grind it evenly, transfer it to 600°C and roast it for 6 hours to obtain Fe 2 o 3 / Al 2 o 3 catalyst.

[0053] In step 3, the obtained catalyst powder is pressed into tablets and sieved to obtain 20-40 mesh catalyst particles.

Embodiment 3

[0055] Step 1, takes by weighing 0.36g ammonium molybdate ((NH 4 ) 6 Mo 7 o 24 ﹒ 4H 2 O) dissolved in 4ml deionized water, 2.0gAl 2 o 3 immersed in the solution

[0056] Step 2, the product obtained in step 1 was dried at room temperature and 80°C for 12 hours, and the obtained solid was ground into powder, and calcined at 600°C for 6 hours in an air atmosphere to obtain MoO 3 / Al 2 o 3 catalyst

[0057] Step 3, the obtained MoO 3 / Al 2 o 3 The catalyst is pressed into tablets and sieved to obtain 20-40 mesh catalyst particles.

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PUM

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Abstract

The invention discloses an iron-molybdenum composite metal oxide catalyst and a preparation method and application thereof. Precursors of iron oxide and molybdenum oxide of different amounts are impregnated on an alumina carrier together, and a 1MoxFeAl catalyst is obtained after drying, roasting, tableting and screening, wherein the supporting amount of iron is 3-40%, x represents the molar ratioof iron and molybdenum, and the molar ratio range is 3-15. The catalyst can simultaneously achieve the high conversion rate of propane and the high selectivity of propylene, meanwhile the introduction of lattice oxygen in the catalyst breaks thermodynamic equilibrium and improves the efficiency of the catalyst. After the propane passes through a catalyst bed layer, metal oxide in a high valence state is reduced, the lattice oxygen is lost, the state becomes a low valence state, and catalytic activity is lost. After N2 purification, the reacted catalyst is re-oxidized to be in a high-valence state by introducing air at the reaction temperature, lattice oxygen is supplemented, and g the capacity of oxidative dehydrogenation of propane is regained.

Description

technical field [0001] The invention relates to a composite metal oxide dehydrogenation catalyst, specifically including the preparation of a loaded iron-molybdenum composite metal oxide catalyst and its application in a chemical chain propane dehydrogenation process. Background technique [0002] Propylene is an important chemical raw material, mainly used in the production of polypropylene, acrylonitrile, propylene oxide and other chemical products. At this stage, the production capacity of propylene is growing rapidly, but the main source is light oil cracking and heavy oil catalysis A by-product of the cracking process. Shale gas is rich in a large amount of low-carbon alkanes. As an effective way to rationally utilize low-value saturated alkanes to produce high-value-added corresponding alkenes, alkane dehydrogenation technology has received extensive attention in recent years. [0003] Taking propane direct dehydrogenation (PDH) as an example, industrial catalysts mai...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J23/745B01J23/881B01J23/887B01J23/94C07C5/42C07C11/06
CPCB01J23/28B01J23/745B01J23/881B01J23/8871B01J23/94C07C5/42C07C2523/881C07C2523/887C07C11/06Y02P20/52Y02P20/584
Inventor 巩金龙王显辉曾亮陈赛
Owner TIANJIN UNIV
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