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A kind of supported-coated noble metal catalyst and its preparation and application

A precious metal catalyst, precious metal technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, catalyst protection, etc., can solve the problem of sintering and deactivation of active centers, and promote the movement and sintering of metal particles. and other problems, to achieve the effect of low cost, high repeatability and simple steps

Active Publication Date: 2021-08-31
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, in a water vapor environment, the presence of water vapor will significantly promote the movement and sintering of metal particles, so this method cannot solve the problem of sintering and deactivation of the active center of noble metal catalysts in a water vapor environment.

Method used

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  • A kind of supported-coated noble metal catalyst and its preparation and application

Examples

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preparation example Construction

[0027] Preparation of alumina carrier raw materials:

[0028] Put 40g of commercial pseudo-boehmite into a muffle furnace, heat up to 600°C in an air atmosphere at a heating rate of 1°C / min, roast for 5 hours, and cool down to room temperature naturally to obtain 31g of γ-alumina. is alumina I;

[0029] Put 30g of commercial pseudo-boehmite into a muffle furnace, heat up to 1200°C in an air atmosphere at a heating rate of 2°C / min, roast for 12 hours, and cool down to room temperature naturally to obtain 23g of α-alumina. is alumina II;

[0030] Put 10g of commercial pseudo-boehmite into an atmosphere roasting furnace, pass through a nitrogen-diluted ammonia atmosphere, the atmosphere contains 80mol% nitrogen and 20mol% ammonia, and heat it to 700°C at a heating rate of 2°C / min. Keep it for 5 hours, switch the atmosphere to nitrogen, cool down to normal temperature naturally, and obtain 7.8g of alumina containing γ phase and η phase, wherein γ-alumina accounts for 15%, and η-...

Embodiment 1

[0032] Catalyst preparation:

[0033] Weigh 8.18g of alumina I, 1.0g of alumina II and 0.82g of alumina III, grind them manually in a mortar for 30min, and mix them uniformly to obtain 10g of alumina carrier powder. The main component of alumina carrier is γ- Alumina, also comprising 7 wt% η-alumina and 10 wt% α-alumina. These alumina carrier powders were mixed with 50 mL of ruthenium trichloride solution with a concentration of 0.04 mol / L in an open beaker. The solid-liquid mixture was mechanically stirred at a stirring speed of 200 rpm, the mixture was heated to 60°C and kept for 2 hours, the resulting mixture was transferred to an oven, and kept at 105°C for 10 hours, and then the obtained solid powder was transferred to the atmosphere In the roasting furnace, in a nitrogen atmosphere, the temperature was raised to 550°C at a rate of 10°C / min, and kept for 4 hours to obtain alumina powder 2% Ru / Al loaded with ruthenium particles 2 o 3 ;

[0034] 10g of 2%Ru / Al 2 o 3 M...

Embodiment 2

[0036] Catalyst preparation:

[0037] Weigh 7.6g of alumina I and 2.4g of alumina II, grind them manually in a mortar for 30min, and mix them uniformly to obtain 10g of alumina carrier powder. The main component of alumina carrier is γ-alumina, which also contains 24wt % of alpha-alumina. These alumina carrier powders were mixed with 50 mL of rhodium trichloride solution with a concentration of 0.03 mol / L in an open beaker. Mechanically stir the solid-liquid mixture at a stirring speed of 240rpm, heat the mixture to 65°C and keep it for 2 hours, transfer the resulting mixture to an oven, keep it at 105°C for 10 hours, and then transfer the obtained solid powder to the atmosphere In the roasting furnace, in a nitrogen atmosphere, the temperature was raised to 550°C at a rate of 10°C / min, and kept for 4 hours to obtain alumina powder 1.5%Rh / Al loaded with rhodium particles 2 o 3 ;

[0038] 10g of 1.5%Rh / Al 2 o 3 Mix the powder with 260mL of ethanol, and keep stirring the m...

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Abstract

The invention relates to a supported-coated noble metal catalyst and its preparation and application method. The catalyst provided by the invention has the characteristics of uniform particle size of precious metal particles, sintering resistance to high temperature water vapor atmosphere, and resistance to oxidation sintering. It is used in the steam reforming reaction process of pure methane or diluted methane, and has high reactivity, less carbon deposition, stable It has the advantages of good performance, no need to restore before reaction, and can be reused many times. The catalyst preparation method provided by the invention has good controllability, high repeatability, simple steps and low cost. The application method can flexibly and conveniently realize hydrogen production by reforming methane in a small and medium scale, and is an efficient on-line hydrogen production technology approach.

Description

technical field [0001] The invention relates to a loaded-coated noble metal catalyst for hydrogen production by steam reforming of methane and a preparation method thereof, belonging to the technical field of energy catalysis. Using the catalyst and application method provided by the invention, methane can be efficiently converted into hydrogen, which is expected to provide an efficient online hydrogen production method for fuel cells. Compared with existing technologies such as natural gas reforming hydrogen production, the noble metal catalyst prepared by the present invention has high activity, stable active center state, no reduction before use, can be reused many times, and is suitable for a wide temperature range of medium and small-scale methane hydrogen production And high space velocity conditions, and the preparation method has good controllability, high repeatability, and simple preparation process, which provides a new on-site hydrogen production technology solutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J23/46B01J33/00B01J35/00B01J37/02B01J37/03C01B3/40
CPCB01J23/42B01J23/462B01J23/468B01J23/58B01J33/00B01J35/006B01J37/0201B01J37/031C01B3/40C01B2203/1064Y02P20/52
Inventor 许国梁丛昱陈帅吴春田唐南方王晓东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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