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Molybdenum and molybdenum-vanadium co-doped nano silicon oxide based catalyst, preparation method and application thereof

A nano-silica, silicon oxide-based technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, carbon-based compound preparation, etc., can solve the problems of long synthesis cycle and complex synthesis steps , to achieve the effects of short preparation cycle, simple preparation method and large specific surface area

Active Publication Date: 2018-06-08
SHENYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis steps of SBA-15 and KIT-6 are complicated, the synthesis cycle is long and need to go through high temperature and high pressure operations such as Jinghua. Compared with SBA-15 and KIT-6, mesoporous nano-silica particles have a simple preparation method. , short period, large specific surface area, and rich pore structure, it is a good catalyst carrier

Method used

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  • Molybdenum and molybdenum-vanadium co-doped nano silicon oxide based catalyst, preparation method and application thereof
  • Molybdenum and molybdenum-vanadium co-doped nano silicon oxide based catalyst, preparation method and application thereof
  • Molybdenum and molybdenum-vanadium co-doped nano silicon oxide based catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A metal molybdenum framework doped mesoporous nano-SiO 2 Particle catalysts in which Mo:Si molar ratio is 0.1:100 Mo-SiO 2 The catalyst is obtained through the following preparation steps:

[0067] (1) Weigh the corresponding mass (NH 4 ) 6 Mo 7 o 24 Add 15mL of deionized water, heat and stir in a 35°C water bath for 1 hour, then dissolve to form a uniform phase A;

[0068] (2) Weigh 0.5g of CTAB and dissolve it in 55mL of deionized water, add 15mL of ethanol and stir until completely dissolved to obtain solution B;

[0069] (3) Use a pipette to take 15mL of diethyl ether and drop 0.8mL of ammonia water into solution B, stir for 20 minutes, add uniform solution A, and stir for 5 minutes;

[0070] (4) Take 2.5mL TEOS and quickly drop them into the mixed solution of A and B, stir vigorously for 3h, adjust the pH to 7 with hydrochloric acid solution and continue stirring for 1h. The white precipitate was obtained after filtering (water pump decompression system), wa...

Embodiment 2

[0075] A metal molybdenum framework doped mesoporous nano-SiO 2 Particle catalyst, Mo-SiO with Mo:Si molar ratio of 10:100 2 The preparation steps of the catalyst are the same as in Example 1, except that the doping amount of metal molybdenum is different, which is recorded as 10Mo-m-SiO 2 .

[0076] The method for catalyzing the selective oxidation reaction of propane adopted by the catalyst, and the detection and analysis method of reactants are all the same as those in Example 1. Table 2 is 10Mo-m-SiO 2 Selective distribution of main products in selective oxidation of propane over catalyst.

[0077] Table 2 10Mo-m-SiO 2 Selective Distribution of Main Products in Selective Oxidation of Propane over Catalyst

[0078]

Embodiment 3

[0080] A metal molybdenum framework doped mesoporous nano-SiO 2 Particle catalyst in which the Mo:Si molar ratio is 3:100 Mo-SiO 2 The preparation steps of the catalyst are the same as in Example 1, except that the doping amount of metal molybdenum is different, which is denoted as 3Mo-m-SiO 2 .

[0081] The method for catalyzing the selective oxidation reaction of propane adopted by the catalyst, and the detection and analysis method of reactants are all the same as those in Example 1. Table 3 is 3Mo-m-SiO 2 Selective distribution of main products in selective oxidation of propane over catalyst.

[0082] Table 3 3Mo-m-SiO 2 Selective Distribution of Main Products in Selective Oxidation of Propane over Catalyst

[0083]

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PUM

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Abstract

The invention discloses a molybdenum and molybdenum-vanadium co-doped nano silicon oxide based catalyst, a preparation method and the application thereof, and belongs to the technical field of heterogeneous catalysis. By taking mesoporous nano SiO2 particles as a carrier and molybdenum or molybdenum-vanadium as an active ingredient, the catalyst is synthesized in one step through an in-situ method. Molybdenum oxygen and molybdenum-vanadium oxygen species are doped to enter into a mesoporous nano SiO2 particle skeleton, the molar ratio of Mo to Si is 0.01 to 15: 100, and the molar ratio of V, Mo to Si is 0.5-1.5 to 0.5-1.5: 100. The invention also provides a preparation method of the catalyst and the application of the catalyst in oxygen-containing compounds such as olefin and acrolein produced through selective oxidation of propane. The molybdenum and molybdenum-vanadium co-doped nano silicon oxide based catalyst is rapidly synthesized by adopting a simple and efficient one-step emulsion synthesis method and using cheap raw materials, the catalyst is used into the selective oxidation reaction of propane, and the selectivity of the target products such as olefins and total aldehydescan reach 73.4%.

Description

technical field [0001] The invention relates to a molybdenum and molybdenum vanadium co-doped nano-silicon oxide-based catalyst and a preparation method and application thereof, belonging to the technical field of petrochemical catalysis. Background technique [0002] in 1968, ( W, Fink A, Bohn E.J.Colloid Interface Sci., 1968,26:62.) prepared silica microspheres with uniform particle size by adding TEOS to water, ethanol and ammonia water system; in 1992, Mobil Corporation's Scientists (J.S.Beck, J.C.Vartuli, W.J.Roth, et al., J.Am.Chem.Soc., 1992, 114:10834-10843) used nanostructure self-assembly technology for the first time to prepare media with uniform channels and adjustable pore sizes. Porous silica MCM-41, since then mesoporous silica nanomaterials have received extensive attention. [0003] Due to the advantages of adjustable pore size, high specific surface area, and good thermal stability, mesoporous silica nanomaterials have shown good application prospects...

Claims

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Application Information

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IPC IPC(8): B01J23/28C07C5/333C07C11/06C07C45/35C07C47/22C07C4/06C07C11/04
CPCB01J23/28C07C4/025C07C5/3335C07C45/35C07C11/06C07C47/22C07C11/04Y02P20/52
Inventor 赵震范晓强宋佳欣王晓晗刘丹丹孔莲于学华
Owner SHENYANG NORMAL UNIV
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