Preparation method of ZrO2 nanotube supported B2O3 catalyst

A technology of catalysts and nanotubes, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of complex catalyst preparation process and large amount of waste liquid, and achieve favorable performance and reaction The effect of faster speed and controllable pipe diameter

Inactive Publication Date: 2011-07-20
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: provide a kind of anodic oxidation method to prepare B 2 o 3 /ZrO 2 The method of nanotube sup

Method used

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  • Preparation method of ZrO2 nanotube supported B2O3 catalyst
  • Preparation method of ZrO2 nanotube supported B2O3 catalyst

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Embodiment 1

[0024] Formulated with 1.0% (wt) NH 4 F, 2% (wt) boric acid, 10% (wt) (NH 4 ) 2 SO 4 The aqueous solution is used as the reaction medium, the zirconium sheet is used as the anode, and the platinum sheet is used as the cathode. The distance between the anode and the cathode is 1.5 cm. The anodic oxidation reaction is carried out at room temperature with 20V direct current for 4 hours, and oxides are formed on the surface of the zirconium sheet. After the reaction, the oxide is dried at 120°C and calcined at 500°C to obtain the catalyst.

[0025] From attached figure 1 It can be seen that the diameter of the catalyst is 120nm, the length reaches 50μm, and the specific surface area is 24.3m 2 / g, which is similar to the specific surface area of ​​a powder with a diameter of 42nm, and its volume is 14,600 times that of the powder.

Embodiment 2

[0027] Formulated with 0.5% (wt) NH 4 F, 6% (wt) ammonium borate, 5% (wt) (NH 4 ) 2 SO 4 The aqueous solution is used as the reaction medium, the zirconium sheet is used as the anode, and the platinum sheet is used as the cathode. The distance between the anode and the cathode is 1.5 cm. The anodic oxidation reaction is carried out at room temperature with 30V direct current for 3 hours, and oxides are formed on the surface of the zirconium sheet. After the reaction, the oxide is dried at 120°C and calcined at 400°C to obtain the catalyst.

Embodiment 3

[0029] Formulated with 1.0% (wt) NH 4 F, 0.1% (wt) boric acid, 12% (wt) (NH 4 ) 2 SO 4 The aqueous solution is used as the reaction medium, the zirconium sheet is used as the anode, and the platinum sheet is used as the cathode. The distance between the anode and the cathode is 1.5 cm. The anodic oxidation reaction is carried out at room temperature with 10V direct current for 5 hours, and oxides are formed on the surface of the zirconium sheet. After the reaction, the oxide is dried at 120°C and calcined at 600°C to obtain the catalyst.

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Abstract

The invention discloses a preparation method of a ZrO2 nanotube supported B2O3 catalyst, which comprises the following steps of: preparing aqueous solution containing NH4F with the concentration of 0.5 to 1.0%, boride with the concentration of 0.1 to 6% and (NH4)2SO4 with the concentration of 5 to 12%, taking the aqueous solution as reaction medium, taking a zirconium plate as anode and a platinum plate as cathode with the spacing of 1.5cm therebetween, adopting 10-30V direct current for anode oxidation for 3 to 5 hours at room temperature, stopping reaction, drying and roasting the resultant oxide to obtain the catalyst, wherein all the concentration percents are mass percents. The B2O3/ZrO2 catalyst prepared according to the method of the invention has large specific surface area and volume simultaneously, and when the specific surface area thereof is the same as that of nano powder, the volume is ten thousand times as much as that of nano powder, thus the contradiction between specific surface area and volume of powder carrier is settled, and the defects caused by the fact that powder ZrO2 supports the B2O3 catalyst can be overcome.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano functional materials, in particular to a ZrO 2 Nanotube loading B 2 o 3 Catalyst preparation method. technical background [0002] Zirconia has acidic, basic, oxidizing and reducing properties at the same time, and is a catalyst carrier with excellent performance. ZrO 2 load B 2 o 3 The catalyst has good catalytic performance for alkane isomerization, phenol alkylation, Friedel-Crafts acylation, transesterification, Beckmann rearrangement and other reactions. [0003] Currently, ZrO 2 load B 2 o 3 The preparation method of the catalyst is mainly divided into two steps. Firstly, ZrO is prepared by precipitation method, sol-gel method and other methods. 2 Carrier, and then prepare catalyst with boric acid etc. as boron source. [0004] "Journal of Molecular Catalysis A" (2004,212, P337-344) reported a preparation B 2 o 3 / ZrO 2 The method of catalyst, the method adopts the ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J35/10
Inventor 王西新赵建玲侯晓蕊赵靓唐成春
Owner HEBEI UNIV OF TECH
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