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A kind of nh that catalyzes the hydrolysis of ammonia borane to produce hydrogen 2 -mil-125 supported silver-cobalt alloy nanocatalyst
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A technology of NH2-MIL-125 and nano-catalysts, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, hydrogen production, etc., to achieve small size, excellent stability, and easy implementation Effect
Active Publication Date: 2020-08-07
HUBEI UNIV
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However, with NH 2 -MIL-125 is used as a carrier, and metal or alloy nanoparticles such as Ag are used as active components to form nano-catalysts that are used to catalyze the hydrolysis of ammonia borane to produce hydrogen.
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Embodiment 1
[0031] Example 1 NH 2 -MIL-125 and Ag 0.1 co 0.2 @NH 2 - Preparation of MIL-125 supported nano catalyst
[0032] 1) Preparation of carrier NH by solvothermal method 2 - MIL-125, 100 mg of the prepared NH 2 - Mix MIL-125 with 10mL of anhydrous methanol, sonicate for 10min, transfer the resulting suspension to a round bottom flask, add 10mL of 0.01M AgNO 3 solution, 20mL 0.01M Co(NO 3 ) 2 solution and 9mL deionized water, mix well, and magnetically stir for 4h; wherein, the molar ratio of silver to cobalt is 0.1:0.2;
[0033] 2) Add 1mmol NaBH 4 The solid reducing agent was dissolved in 10 mL of deionized water, and added dropwise to the suspension in the above step (1), and continued to stir for 5 h after the dropwise addition was completed; the product was filtered, washed with methanol, and dried in vacuum at 80°C overnight to obtain NH 2 -MIL-125 Supported Nano Catalyst Ag 0.1 co 0.2 @NH 2 -MIL-125.
Embodiment 2
[0034] Example 2 Ag 0.1 co 0.1 @NH 2 - Preparation of MIL-125 supported catalyst
[0035] 1) Preparation of carrier NH by solvothermal method 2 - MIL-125, 100 mg of the prepared NH 2 - Mix MIL-125 with 10mL of anhydrous methanol, sonicate for 10min, transfer the resulting suspension to a round bottom flask, add 10mL of 0.01M AgNO 3 solution, 10mL 0.01M Co(NO 3 ) 2 solution and 9mL deionized water, mix well, and magnetically stir for 4h; wherein, the molar ratio of silver to cobalt is 0.1:0.1;
[0036] 2) Add 1mmol NaBH 4 The solid reducing agent was dissolved in 10 mL of deionized water, and added dropwise to the suspension in the above step (1), and continued to stir for 5 h after the dropwise addition was completed; the product was filtered, washed with methanol, and dried in vacuum at 80°C overnight to obtain NH 2 -MIL-125 Supported Nano Catalyst Ag 0.1 co 0.1 @NH 2 -MIL-125.
Embodiment 3
[0037] Example 3 Ag 0.1 co 0.3 @NH 2 - Preparation of MIL-125 supported catalyst
[0038] 1) Preparation of carrier NH by solvothermal method 2 - MIL-125, 100 mg of the prepared NH 2 - Mix MIL-125 with 10mL of anhydrous methanol, sonicate for 10min, transfer the resulting suspension to a round bottom flask, add 10mL of 0.01M AgNO 3 solution, 30mL 0.01M Co(NO 3 ) 2 solution and 9mL deionized water, mix well, and magnetically stir for 4h; wherein, the molar ratio of silver to cobalt is 0.1:0.3;
[0039] 2) Add 1mmol NaBH 4 The solid reducing agent was dissolved in 10 mL of deionized water, and added dropwise to the suspension in the above step (1), and continued to stir for 5 h after the dropwise addition was completed; the product was filtered, washed with methanol, and dried in vacuum at 80°C overnight to obtain NH 2 -MIL-125 Supported Nano Catalyst Ag 0.1 co 0.3 @NH 2 -MIL-125.
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Abstract
The invention provides a NH2-MIL-125 loaded silver cobalt alloy nanometer catalyst for catalyzing hydrolysis and hydrogen production of ammonia borane. The NH2-MIL-125 loaded silver cobalt alloy nanometer catalyst comprises an active component and a carrier, wherein the general formula of the nanometer catalyst is Ag0.1Co0.1-0.3@NH2-MIL-125, the carrier is NH2-MIL-125, the active component is Ag-Co alloy nanometer particles, when the molar ratio of Ag to Co is 0.1 to 0.2, the catalytic activity of the nanometer catalyst is the highest, the particle diameter of the Ag-Co alloy nanometer particles is 2.2-8.7 nm, and the specific surface area of the catalyst is 217.5m<2>g<-1>. According to the NH2-MIL-125 loaded silver cobalt alloy nanometer catalyst disclosed by the invention, amination MIL-125 is used as a carrier (NH2-MIL-125), due to the target effects of amino, Ag<+> and Co<2+> are in directional coordination, and after reduction, metal Ag and metal Co are obtained in situ, so that the loading capacity of metal in the carrier NH2-MIL-125 is greatly increased; and besides, the formed AgCo alloy nanometer particles are uniform in distribution, small in size and multiple in activity sites, the Ag0.1Co0.1-0.3@NH2-MIL-125 catalyst expresses efficient catalytic activity and excellent stability for the hydrolysis and hydrogen production of the ammonia borane, the hydrogen release rate of the Ag0.1Co0.1-0.3@NH2-MIL-125 catalyst for catalyzing the hydrolysis of the ammonia borane at room temperature is as high as 6894.7 mL min<-1>g<-1>, and the activation energy is as low as 26.79 kJmol<-1>.
Description
technical field [0001] The invention relates to a binary loaded nano catalyst, in particular to an NH catalyst that catalyzes the hydrolysis of ammonia borane to produce hydrogen 2 -MIL-125 supported silver-cobalt alloy nano catalyst, which belongs to the field of hydrogen storage materials. Background technique [0002] Exploring new clean energy, especially hydrogen energy, is a major issue facing people. Since ammonia borane (NH 3 -BH 3 , AB) is solid at room temperature, easy to carry, soluble in water or polar solvents, stable in the air, non-volatile, non-toxic, safe and reliable, and has a mass hydrogen storage density of up to 19.6%, known as the The hydrogen energy material with the most development potential. Under the action of the catalyst, the aqueous solution of AB can release hydrogen rapidly, and 1mol AB can produce 3mol H 2 , so it is particularly important to seek efficient, stable, and low-cost catalysts. [0003] In the catalytic system of AB hydrol...
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