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A kind of preparation method of iron-molybdenum composite doped oxide
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A compound doping and oxide technology, which is applied in the preparation of organic compounds, carbon-based compounds, chemical instruments and methods, etc., to achieve the effect of uniform doping
Inactive Publication Date: 2019-05-24
CENT SOUTH UNIV
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The entire production process only needs to deal with the exhaust gas problem, and the emission standard requirements can be met through proper treatment
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Embodiment 1
[0018] Weigh 0.02mol of ferric sulfate and 0.05mol of ammonium paramolybdate, dissolve them in 50mL of water respectively, add 0.03mol of citric acid into the ferric sulfate solution, pour the ammonium paramolybdate solution into the iron solution while stirring, and then add 0.02 mol of acrylamide, 0.004mol of N,N'-methyleneacrylamide, and 0.0012mol of azobisisobutyronitrile were added under the condition of stirring. The mixed solution will solidify quickly to form a precursor, take out the precursor, divide it into pieces, and roast it at 450°C for 1 hour to obtain the iron-molybdenum composite oxide catalytic material. observed by Fe 2 (MoO 4 ) 3 and MoO 3 Coexisting complex phases.
Embodiment 2
[0020] Weigh 0.015mol of ferric sulfate, 0.04mol of ammonium paramolybdate, and 0.005mol of ammonium metavanadate, mix the molybdenum and vanadium salts directly, dissolve the raw materials in 50mL of water, and add 0.03mol of ethylenediaminetetraacetic acid into the ferric sulfate solution , Pour the molybdenum and vanadium solutions into the iron solution while stirring, then add 0.03mol acrylamide, 0.005mol N, N'-methyleneacrylamide, and add 0.0015mol azobisisobutyronitrile under stirring conditions. The mixed solution will solidify rapidly to form a precursor, which is taken out, divided into pieces, and calcined at 600°C for 1 hour to obtain the iron-molybdenum-vanadium composite doped oxide catalytic material.
Embodiment 3
[0022] Weigh 0.02 mol of iron sulfate, 0.05 mol of ammonium paramolybdate, and 0.005 mol of cobalt acetate, mix the iron and cobalt salts directly, dissolve the raw materials in 50 mL of water, and add 0.03 mol of ethylenediaminetetraacetic acid into the solution of iron sulfate and cobalt , Pour the molybdenum solution into the iron solution while stirring, then add 0.025mol acrylamide, 0.004mol N, N'-methyleneacrylamide, and add 0.0013mol azobisisobutyronitrile under stirring conditions. The mixed solution will solidify quickly to form a precursor, which is taken out, divided into pieces, and calcined at 500°C for 1 hour to obtain the iron-molybdenum-cobalt composite doped oxide catalytic material.
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Abstract
The invention discloses a preparation method of an iron-molybdenum compositely doped oxide. The method comprises the steps that iron salt, molybdenum salt, dopant and the like serve as raw materials, the raw materials are mixed to obtain a mixed solution to directly form a solid precursor, calcination is conducted at certain temperature, and then an iron-molybdenum compositely doped oxide catalytic material with the components capable of being continuously adjusted is obtained. The preparation method has the greatest advantages that the steps of precipitation washing and solution drying are omitted, the raw materials are not wasted, no water body pollutant is generated, the product components are uniform, and the method is suitable for industrial production achieving continuous operation. According to the preparation method of the iron-molybdenum compositely doped oxide, a feasible technical route is provided for production of a high-performance iron-molybdenum catalyst, and the product is expected to obtain important application value in the fields of catalytic and high-performance materials and the like.
Description
technical field [0001] The invention belongs to the technical field of chemical catalysis and functional materials, and specifically relates to a catalytic material mainly composed of iron oxide-molybdenum oxide composite doped oxide and a preparation method thereof. Background technique [0002] Formaldehyde is an important raw material and product in industrial production. At present, the main technology for producing formaldehyde is the catalytic production of formaldehyde by methanol in coal chemical enterprises. The catalyst is mainly based on MoO 3 and Fe 2 (MoO 4 ) 3 As the main component, a small amount of other metal ions can be doped to improve the performance of the catalyst. At present, there are more than 10 manufacturers in my country that use iron-molybdenum catalysts to produce formaldehyde. They mainly introduce foreign patented devices and purchase foreign iron-molybdenum catalysts to realize the continuous production of formaldehyde. [0003] In the c...
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