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Pt-PbOx/C catalyst and preparation method thereof

A pt-pbox and catalyst technology, applied in the field of electro-oxidation catalysts, can solve the problems of unclear influence of catalytic activity, inability to realize controllable preparation of metal components on the surface of the catalyst, etc., and achieves the advantages of environmental protection and simple and easy preparation process. , the effect of high activity

Inactive Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the influence of the metal components on the catalyst surface on the catalytic activity is still unclear, and this preparation method cannot achieve the controllable preparation of the metal components on the catalyst surface

Method used

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  • Pt-PbOx/C catalyst and preparation method thereof
  • Pt-PbOx/C catalyst and preparation method thereof
  • Pt-PbOx/C catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: PbO x Colloid preparation

[0045] Preparation of PbO by Hydrolysis of Lead Tetraacetate x colloid. Add 50 mL of water to a 500 mL volumetric flask, then add about 447 mL of ethanol, and add about 3 mL of acetic acid liquid-sealed Pb(CH) after mixing evenly. 3 COO) 4 Solid, quickly and uniformly dispersed by ultrasonic to obtain orange-yellow PbO x colloid.

Embodiment 2

[0046] Embodiment 2: adopt the first method to prepare Pt-PbO x / C catalyst, labeled Pt-PbO x / C-1

[0047] PbO x / C preparation: take 330 mg of C carrier and add it to 150 mL of the above PbO x In the colloid, ultrasonically stirred for 3 min, filtered, and dried in an air oven at 80 °C for 6 h to obtain PbO x / C precursor. Pt colloid supported by ethylene glycol reduction method: add 5.41mL7.4mg to a 250mL three-necked bottle Pt mL -1 H 2 PtCl 6 EG solution, then add 8mL 1M NaOH / EG solution, then add 7mL ethylene glycol, after ultrasonic dispersion is uniform, electromagnetic stirring in oil bath and heating to 125 ℃, after constant temperature reaction for 2h, black Pt colloid is obtained. The ethylene glycol solution of the Pt colloid was cooled to 70°C, and 160 mg of ethylene glycol-dispersed PbO was added. x / C, add about 80 mL of high-purity water after stirring for 30 min, and adjust the pH to 6-7 with 1M HCl aqueous solution, stir for 3 h, filter, wash, and ...

Embodiment 3

[0048] Example 3: Pt-PbO was prepared by the second method x / C catalyst, labeled Pt-PbO x / C-2

[0049] According to Pt / PbO x Preparation steps of Pt colloid in / C catalyst Prepare 40mg Pt colloid in ethylene glycol solution, add 72.7mL PbO at 70°C x colloid, after stirring for 30min, add about 20mL of ethylene glycol dispersed C, after electromagnetic stirring for 30min, add high-purity water until the total solution volume is about 250mL, adjust the pH value to 5-6, react for 3h and then drop to room temperature, filter, wash, 75 ℃ vacuum dried for 7h to obtain Pt-PbO x / C-2 catalyst.

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Abstract

The invention relates to a preparation method of a Pt-PbOx / C catalyst. The catalyst comprises 1-50mass% of Pb and below 85mass% of Pt. The catalyst is obtained through the hydrolysis-modified ethylene glycol method, and the preparation method comprises the steps of preparation of PbOx colloid, and preparation of the Pt-PbOx / C catalyst. The Pt / Pb atom ratio of the surface of the catalyst is controlled by controlling the sequence of the supporting of the PbOx and Pt colloid to the surface of a support in the preparation process of the catalyst, and the catalyst has the advantages of high catalysis activity on a formic acid electrooxidation reaction, good stability, simple preparation process and amplified production realization, and is used as a formic acid electrochemical oxidation reaction catalyst.

Description

technical field [0001] The invention relates to an electro-oxidation catalyst, in particular to a catalyst for formic acid electro-oxidation reaction and a preparation method thereof. Background technique [0002] The electro-oxidation process of formic acid on the surface of Pt-based catalysts is one of the most studied directions, because this reaction is regarded as the simplest model, which is helpful to understand the reaction mechanism of other complex small-molecule alcohols on the surface of Pt-based catalysts. The reaction process of formic acid electro-oxidation reaction (FAOR) is very simple, it only involves the transfer process of 2 electrons, and it undergoes two reaction pathways on the surface of Pt: one is direct oxidation to generate CO 2 The way of (equation (1)), the other is to generate CO ad CO for intermediates (which will poison Pt) ad Pathway (formula (2)) [ACS Catalysis, 2012, 2, 728-738]: [0003] [0004] HCOOH→(CO) ad +H 2 O(2a) [0005]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62H01M4/92
CPCY02E60/50
Inventor 孙公权李光兰姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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