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Supported iron-tungsten bimetallic composite oxide and preparation method and application thereof

A composite oxide and bimetallic technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve catalyst deactivation, low reactivity, poor stability, etc. problem, to achieve the effect of improving conversion rate, improving activation ability and improving structural stability

Active Publication Date: 2020-03-13
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] What the present invention aims to solve is the low reaction activity and poor stability of the existing single metal oxide in the chemical chain synthesis gas technology, and the carbon deposition in the Ni-W double metal oxide gradually increases with the increase of the number of cycles, and the catalyst gradually loses Active technical issues, providing a supported iron-tungsten double metal oxide and its preparation method and the application

Method used

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  • Supported iron-tungsten bimetallic composite oxide and preparation method and application thereof
  • Supported iron-tungsten bimetallic composite oxide and preparation method and application thereof
  • Supported iron-tungsten bimetallic composite oxide and preparation method and application thereof

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Embodiment 1

[0038] Step 1, ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and ammonium metatungstate (H 28 N 6 o 41 W 12 ) is ultrasonically dissolved in deionized water to obtain a precursor solution; wherein the molar ratio of ferric nitrate nonahydrate to ammonium metatungstate is 6;

[0039] Step 2, impregnate the precursor solution after ultrasonic dissolution in step 1 into the inert oxide carrier SiO 2 on, where Fe x WO y The loading capacity is 50%, and it is continuously oscillated and ultrasonicated until the impregnation is uniform;

[0040] Step 3, continue to sonicate the colloidal precursor solution uniformly impregnated in step 2 for 4 hours until it is completely uniform;

[0041] Step 4, drying the substance obtained in step 3 at room temperature for 12 hours, then drying at 100°C for 12 hours, and finally roasting at 800°C for 4 hours in an air atmosphere to obtain the supported iron-tungsten bimetallic composite oxide, whose molecular formula is Fe 0.5 WO 3....

Embodiment 2

[0043] Step 1, ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and ammonium metatungstate (H 28 N 6 o 41 W 12 ) was ultrasonically dissolved in deionized water to obtain a precursor solution; wherein the molar ratio of ferric nitrate nonahydrate to ammonium metatungstate was 12;

[0044] Step 2, impregnate the precursor solution after ultrasonic dissolution in step 1 into the inert oxide carrier SiO 2 on, where Fe x WO y The loading capacity is 40%, and it is continuously shaken and ultrasonicated until the impregnation is uniform;

[0045] Step 3, continue to sonicate the colloidal precursor solution uniformly impregnated in step 2 for 2 hours until it is completely uniform;

[0046] Step 4, drying the material obtained in step 3 at room temperature for 10 hours, then drying at 90°C for 10 hours, and finally roasting at 900°C for 3 hours in an air atmosphere to obtain the supported iron-tungsten bimetallic composite oxide, whose molecular formula is FeWO 4.5 / SiO 2...

Embodiment 3

[0048] Step 1, ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and ammonium metatungstate (H 28 N 6 o 41 W 12 ) was ultrasonically dissolved in deionized water to obtain a precursor solution; wherein the molar ratio of ferric nitrate nonahydrate to ammonium metatungstate was 12;

[0049] Step 2, impregnate the precursor solution after ultrasonic dissolution in step 1 into the inert oxide carrier SiO 2 on, where Fe x WO y The loading capacity is 50%, and it is continuously oscillated and ultrasonicated until the impregnation is uniform;

[0050] Step 3, continue to sonicate the colloidal precursor solution uniformly impregnated in step 2 for 2 hours until it is completely uniform;

[0051] Step 4, drying the material obtained in step 3 at room temperature for 10 hours, then drying at 90°C for 10 hours, and finally roasting at 900°C for 3 hours in an air atmosphere to obtain the supported iron-tungsten bimetallic composite oxide, whose molecular formula is FeWO 4.5 / Si...

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Abstract

The invention belongs to the technical field of metal composite oxides, and discloses a supported iron-tungsten bimetallic composite oxide, and a preparation method and an application thereof. The catalyst is characterized in that FexWOy is uniformly supported on an inert oxide carrier, x is more than 0 and less than or equal to 2, and y is more than 3 and less than or equal to 6. The preparationmethod comprises the following steps: carrying out equivalent-volume impregnation on a precursor solution completely dissolved through ultrasonic dissolution to realize loading of the precursor onto the inert oxide carrier, and carrying out ultrasonic treatment until complete uniformizing is achieved; and then drying and roasting to obtain the supported iron-tungsten bimetallic composite oxide. The method is suitable for the fields of chemical-looping autothermal gasification of fuels such as methane, direct preparation of synthesis gas through reforming and the like, on one hand, heat absorbed in the reduction process and heat released in the oxidation process can be coupled, autothermal reforming is achieved, and energy consumption is reduced; on the other hand, lattice oxygen in an oxygen carrier is used as a source of oxygen species, so that the selectivity on the synthesis gas can be improved, the yield of the synthesis gas is increased, and meanwhile, the risk of explosion causedby direct contact between air and methane can be avoided.

Description

technical field [0001] The invention belongs to the technical field of metal composite oxides, and specifically relates to a supported iron-tungsten double metal oxide and a preparation method thereof, and the catalyst is directly produced by three-bed autothermal reforming of low-carbon alkanes and other fuels Syngas applications. [0002] technical background [0003] In recent years, with the rapid development of the national economy, my country's oil consumption has shown an upward trend. It is estimated that my country's oil gap will reach 270 million tons in 2020, and the degree of dependence on foreign countries will reach 60%. Although coal resources are abundant, the resource reserves are 1.34 trillion tons. However, due to serious pollution during use, it poses serious challenges to environmental protection. Therefore, people began to pay attention to natural gas, which has abundant sources and can be used as high-quality clean energy and chemical raw materials, exp...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01J37/02C01B3/40
CPCB01J23/888B01J23/002B01J37/0201C01B3/40B01J2523/00C01B2203/0244C01B2203/1047B01J2523/41B01J2523/69B01J2523/842B01J2523/31B01J2523/47Y02P20/52
Inventor 巩金龙刘蕊王宗宝张先华苏迎辉王林王奕然肖海成李庆勋
Owner TIANJIN UNIV