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Preparation method of porous silica coated Co-N-C hollow nanotube material and application thereof

A silica, loose and porous technology, applied in chemical instruments and methods, catalyst activation/preparation, inorganic chemistry, etc., to achieve the effect of novel method, convenient synthesis process and post-treatment, and mild conditions

Active Publication Date: 2019-01-11
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalysts that catalyze the hydrolysis of ammonia borane are mainly divided into noble metal catalysts and non-noble metal catalysts. The noble metal catalysts mainly include Rh, Ir, Ru, Pt and their alloys, which are currently the most efficient ammonia borane hydrolysis catalysts. The scarcity and high cost limit their wide application

Method used

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  • Preparation method of porous silica coated Co-N-C hollow nanotube material and application thereof
  • Preparation method of porous silica coated Co-N-C hollow nanotube material and application thereof
  • Preparation method of porous silica coated Co-N-C hollow nanotube material and application thereof

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Experimental program
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Effect test

Embodiment 1

[0031] A kind of preparation method of porous silicon dioxide coating Co-N-C hollow nanotube material, comprises the following steps:

[0032] (1) Preparation of MoO 3 Nanorods (A1): Mix 6.665mL of nitric acid with 33.335mL of deionized water with a 1000mL pipette gun, then weigh 1.4g of ammonium molybdate, add the supernatant and stir for 20min, then transfer to a 100mL reactor, and react in an oven at 200°C 20h, centrifuge and wash after cooling to obtain MoO3 Drying, the SEM and TEM images are as follows figure 2 (a), figure 2 As shown in (b), it can be seen from the figure that the obtained MoO 3 It is a solid nanorod structure with a diameter of 300nm;

[0033] (2) Preparation of MoO 3 @ZIF-67 Nanorod (A2): Weigh 4.5982g 2-methylimidazole and dissolve it in 280mL methanol, and add 0.5g MoO after it is completely dissolved 3 After ultrasonic dispersion was uniform, 140 mL of 0.03 g / mL Co(NO 3 ) 2 Methanol solution, let stand at room temperature for 3h, centrifuge ...

Embodiment 2

[0039] Application of loose and porous silica-coated Co-N-C hollow nanotubes in catalytic hydrogen production from ammonia borane

[0040] First, 10mg Co-N-C@SiO 2 The catalyst was pretreated with freshly prepared 10 mL of ammonia borane (AB) aqueous solution at a concentration of 3.3 mg / mL in a 25 mL double-neck round bottom flask for 12 min to improve the Co-N-C@SiO 2 of dispersion. One port is then sealed with a rubber cap and the other port is connected with a gas collection system. Then, 0.5 mL of AB aqueous solution with a concentration of 66 mg / mL was quickly injected into the reaction system under vigorous stirring at 1000 rpm. Gases generated by hydrolysis are measured by a typical water displacement method. The durability cycle test is to add another equivalent amount of 0.5mL AB aqueous solution with a concentration of 66mg / mL to the reaction system after the reaction of the added AB solution is complete, and then collect and measure the released hydrogen gas aga...

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Abstract

The invention discloses a preparation method of a porous silica coated Co-N-C hollow nanotube material and an application thereof. According to the invention, MoO3 is prepared as nanorod, the surfaceof MoO3 as the nanorod is loaded with ZIF-67, and MoO3@ZIF-67 nanorod is obtained; MoO3 is used as a self-sacrificial template is used, a 2-methylimidazole aqueous solution can provide the alkaline environment for simultaneously dissolving MoO3 and promoting the hydrolysis of a SiO2 precursor, and the ordered ZIF-67@SiO2 hollow nanorod can be obtained; and the porous Co-N-C@SiO2 nanotube can be obtained by high temperature calcination under nitrogen protection. and can be used as a non-precious metal catalyst for efficiently catalyzing the hydrolysis of ammonia borane. A TOF value can reach 8.4mol min<-1>mol<-1>(Co) at 298K, the material has low activation energy of 36.1kJ mol<-1>, and can achieve recyclability by more than ten times.

Description

technical field [0001] The invention belongs to the technical field of nano-catalysis materials, and in particular relates to a preparation method and application of a loose and porous silicon dioxide-coated Co-N-C hollow nanotube material. Background technique [0002] As one of the cleanest energy sources, hydrogen energy has attracted more and more attention. Among hydrogen storage materials, boron nitrogen compounds have received special attention due to their high mass hydrogen storage density and easy dehydrogenation. Among them, ammonia borane has a mass hydrogen storage density of 19.6%, is very stable at room temperature, and can be rapidly hydrolyzed to release hydrogen with the action of a catalyst. The catalysts that catalyze the hydrolysis of ammonia borane are mainly divided into noble metal catalysts and non-noble metal catalysts. The noble metal catalysts mainly include Rh, Ir, Ru, Pt and their alloys, which are currently the most efficient ammonia borane hyd...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J37/00C01B3/04
CPCC01B3/04B01J27/24B01J37/0018C01B2203/1088C01B2203/0277B01J35/60Y02E60/36
Inventor 陈美玲刘小网
Owner ANHUI NORMAL UNIV
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