Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method and application of highly active core-shell structure catalyst

A core-shell structure and catalyst technology, applied in structural parts, nanotechnology for materials and surface science, electrical components, etc., can solve the problems of high precious metal loading, low alloy degree, low catalytic efficiency, etc., and achieve high activity , Excellent stability effect

Inactive Publication Date: 2016-01-20
DALIAN JIAOTONG UNIVERSITY
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high noble metal loading, low alloy degree and low catalytic efficiency in the core-shell structure catalyst with Pt and Ru as the outer shell in the prior art, the present invention provides a SnO with high alloy degree of PtRu alloy and high catalytic efficiency. / SnO 2 PtRu / C core-shell catalyst

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method and application of highly active core-shell structure catalyst
  • A kind of preparation method and application of highly active core-shell structure catalyst
  • A kind of preparation method and application of highly active core-shell structure catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] ①SnO / SnO 2 Preparation of inner core: accurately weigh 200mgSnCl 2 2H 2 O, dissolve it in 100mL ethylene glycol in a beaker, then weigh 140mg gum arabic and place it in the same beaker, after the dissolution is complete, pour the above solution into a three-necked bottle, wash the beaker with 50mL ethylene glycol Pour into a three-necked bottle and mix evenly under magnetic stirring. Ethylene glycol solution of NaOH was added to adjust the pH value of the solution to 7. Under an air atmosphere, the oil bath was heated to 60°C at a heating rate of 10°C / min and kept for 1h; then the air was changed to argon and purged for 1h.

[0028] ② Preparation of high-alloy PtRu alloy shell: 40.3mgRuCl 3 ·xH 2 O was dissolved in 100mL of ethylene glycol, added to the above-mentioned three-necked flask, stirred evenly, adjusted to pH 6 with 0.1mol / L hydrochloric acid solution, and then heated to 150°C at a speed of 10°C / min, then added 76.5 MgH 2 PtCl 6 ·6H 2 O, continue to h...

Embodiment 2

[0040] Accurately weigh 200mgSnCl 2 2H 2 O, dissolve it in 100mL ethanol in a beaker, then weigh 203mg gum arabic and place it in the same beaker, pour it into a three-necked flask after dissolving completely and wash the beaker with 50mL ethanol, magnetically stir evenly, use NaOH ethanol solution Adjust the pH of the solution to 7. Under air conditions, the oil bath was heated to 60°C at a rate of 10°C / min and kept for 1h; then the air was changed to argon and purged for 0.5h.

[0041] 40.3mgRuCl 3 ·xH 2 O was dissolved in 100mL ethanol and added to the above-mentioned three-neck flask, stirred evenly, adjusted to pH 6, and then heated to 130°C at a speed of 10°C / min, and then added 76.5mgH 2 PtCl 6 ·6H 2 O, continue to heat up to 170°C and keep for 2h. Lower the temperature to 90°C, add 204 mg carbon powder pre-dissolved in ethanol, adjust the pH value to 2 with hydrochloric acid solution, and keep it for 4 hours.

[0042] After lowering the temperature to room temp...

Embodiment 3

[0049] Accurately weigh 200mgSnCl 2 2H 2 O, dissolve it in 100mL of glycerol in a beaker, then weigh 78mg of gum arabic and put it in the same beaker, pour it into a three-necked bottle after dissolving completely and wash the beaker with 50mL of glycerin, stir evenly The pH value of the solution was adjusted to 7 using NaOH glycerol solution under certain conditions. Under air conditions, the oil bath was heated to 80°C at a rate of 10°C / min and kept for 1h; then the air was changed to argon and purged for 1h.

[0050] 60.6mgRuCl 3 ·xH 2 O was dissolved in 100mL glycerol and added to the above-mentioned three-neck flask, stirred evenly, and the pH value was adjusted to 6, then the temperature was raised to 150°C at a speed of 10°C / min, and 76.5mgH 2 PtCl 6 ·6H 2 O, continue to heat up to 190°C and keep for 2h. Lower the temperature to 90°C, add 234 mg carbon powder pre-dissolved in glycerol, adjust the pH value to 2 with hydrochloric acid solution, and keep it for 4 ho...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a high-activity core-shell structured catalyst. The catalyst uses SnO / SnO2 as a core, and uses a PtRu alloy as a shell. The preparation method comprises the steps of firstly preparing SnO / SnO2 nano particles by a method for performing low-temperature alcoholysis on SnCl2.2H2O by low-carbon alcohol; with Arabic gum as a protective agent and an auxiliary reducing additive, preparing a PtRu alloy shell layer with high alloy degree; reducing Pt and Ru under inert atmosphere protection; and finally, adding a carrier, namely conductive carbon powder, settling catalyst nano particles on the carbon powder and hydrolyzing the Arabic gum to prepare the high-activity SnO / SnO2@PtRu / C core-shell structured catalyst. The catalyst disclosed by the invention can be applied to anodes of proton exchange membrane fuel cells, and has the advantages of relatively high activity, stability and anti-poisoning performance.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to the field of core-shell structure catalysts with non-noble metals as the core and high-alloyed PtRu as the shell. Background technique [0002] Although the overpotential of pure hydrogen is very low at the anode of a proton exchange membrane fuel cell (PEMFC), industrially produced hydrogen typically contains about 10 ppm CO and 20% CO 2 . CO adsorbed on the active sites of Pt, CO 2 Then the water vapor shift reverse reaction will occur to produce Pt-CO ads species. These species will directly lead to catalyst poisoning, greatly reducing the active sites for adsorbing dissociated hydrogen, and causing a sharp increase in the overpotential of the anode. At present, the widely used anode anti-poisoning catalyst is PtRu alloy, and the PtRu loading in the PtRu / C catalyst is usually above 45wt%, while the PtRu loading in the anode catalytic layer is as high as 0...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/94
CPCB82Y30/00B82Y40/00H01M4/925H01M2004/8684Y02E60/50
Inventor 王琪陆兴李志强
Owner DALIAN JIAOTONG UNIVERSITY