Pt/ZIF-67 composite used for catalyzing hydrolysis of ammonia borane for hydrogen production

A technology for catalyzing ammonia borane and ZIF-67, applied in the energy field, can solve the problems of low TOF value and high activation energy, and achieve the effects of inhibiting agglomeration, low cost and broad application prospects.

Inactive Publication Date: 2018-04-20
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of Pt / ZIF-67 composite material that is used to catalyze the hydrolysis of ammonia borane to produce hydrogen, to solve the problems of metal nanoparticles agglomeration and low TOF value and high activation energy in the prior art

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  • Pt/ZIF-67 composite used for catalyzing hydrolysis of ammonia borane for hydrogen production
  • Pt/ZIF-67 composite used for catalyzing hydrolysis of ammonia borane for hydrogen production
  • Pt/ZIF-67 composite used for catalyzing hydrolysis of ammonia borane for hydrogen production

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Embodiment

[0024] The specific operation steps of the Pt / ZIF-67 composite material used to catalyze the hydrolysis of ammonia borane to produce hydrogen are as follows:

[0025] Step 1) Preparation and activation of ZIF-67, add 1 mmol of cobalt acetate tetrahydrate and 20 mmol of 2-methylimidazole into 20 mL of water, mix well by ultrasonic, then put into autoclave, put into oven, keep constant temperature heat up to 120 o C initiates the reaction, and the reaction time is 18 h. After the reaction system is slowly cooled to room temperature, the product is taken out and washed repeatedly with absolute ethanol and deionized water. o After drying under C, ZIF-67 was obtained, and the resulting ZIF-67 was vacuum-conditioned at 150 o C, incubated for 12 h for activation to obtain activated ZIF-67;

[0026] Step 2) Loading of Pt nanoparticles, 100 mg of activated ZIF-67 was added to 15 mL of water, ultrasonically dispersed for 40 min, then 5 mg of chloroplatinic acid was added to the soluti...

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Abstract

The invention discloses a Pt/ZIF-67 composite used for catalyzing hydrolysis of ammonia borane for hydrogen production. The Pt/ZIF-67 composite is prepared by mixing chloroplatinic acid with a metal organic framework ZIF-67 and then carrying out one-step reduction. The structure of the Pt/ZIF-67 composite retains the frame structure of ZIF-67; the average size of Pt nanoparticles is 1-2 nm, the Ptnanoparticles are uniformly distributed, and no obvious Pt metal characteristic diffraction peak occurs according to XRD detection results. A preparation method comprises the following steps: step 1)preparation and activation of the ZIF-67; and step 2) loading of the Pt nanoparticles: adding the activated ZIF-67 into water for ultrasonic dispersion, adding chloroplatinic acid, and then adding anaqueous NaBH4 solution drop by drop, and subjecting a product to filtering, washing and drying. As the Pt/ZIF-67 composite is applied to catalysis of the hydrolysis of ammonia borane for hydrogen production, the turn over frequency (TOF) of a reaction rate reaches 70-100 mol H2 min<-1> Pt mol<-1>, and activation energy is 30-40 kJ mol<-1>. The synergistic effect of the ZIF-67 and the Pt nanoparticles brings in better catalytic performance. Therefore, the Pt/ZIF-67 composite has good application prospects in the field of hydrogen production.

Description

technical field [0001] The invention belongs to the field of energy technology, in particular to a Pt / ZIF-67 composite material used to catalyze the hydrolysis of ammonia borane to produce hydrogen. Background technique [0002] Among various chemical hydrogen storage materials, ammonia borane (ammonia borane, NH 3 BH 3 , AB) with a high hydrogen storage capacity of 19.6 wt%, high stability in solid state and solution, nontoxicity, and good solubility. Therefore, it is considered as one of the promising chemical hydrogen storage materials in various applications. The hydrogen stored in ammonia borane can be released by hydrolysis using a suitable catalyst. So far, there have been a variety of catalysts used to catalyze the hydrolysis of ammonia borane, among which noble metal catalysts exhibit fast hydrogen desorption rate and low activation energy during hydrolysis to hydrogen production, and have excellent catalytic performance. However, the high price limits its produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J35/10C01B3/06
CPCB01J31/1691B01J35/1004B01J2531/0213B01J2531/845C01B3/065Y02E60/36
Inventor 孙立贤罗玉梅徐芬陆常建张东波
Owner GUILIN UNIV OF ELECTRONIC TECH
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