Supported noble metal catalyst and preparation and application thereof

A noble metal catalyst and supported technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, hydrocarbon production from carbon oxide, etc., can solve the problem of insufficient stability of noble metals, aggregation of nanoparticles, Catalyst deactivation and other problems, to achieve good practical application prospects, simple preparation process, good repeatability effect

Active Publication Date: 2015-09-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modified metal oxide and Al 2 o 3 Therefore, the catalyst loaded with noble metal nanoparticles still faces phenomena such as nanoparticle aggregation, catalyst deactivation, and poor stability in practical industrial applications.

Method used

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  • Supported noble metal catalyst and preparation and application thereof
  • Supported noble metal catalyst and preparation and application thereof
  • Supported noble metal catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. 5% La 2 o 3 -Al 2 o 3 Preparation of composite carrier:

[0031] Immersion method: Weigh 0.2798g La(NO 3 ) 3 .6H 2 O is fully dissolved in 3.0ml deionized water and poured into 2.0001g Al 2 o 3 Carrier, stirred evenly, let stand for 2h, then dried at 110°C for 10h, and finally roasted at 650°C for 2h to obtain 5wt.%La 2 o 3 -Al 2 o 3 Composite carrier;

[0032] Co-precipitation method: Weigh 0.2798g La(NO 3 ) 3 .6H 2 O and 2.3670g AlCl 3 .6H 2 O was dissolved in 6.3mL deionized water to make a mixed solution. Under stirring conditions, NaOH solution (2mol / L) was added dropwise until the pH of the La and Al mixed solution was 7. After the dripping, continue to stir for 2h and stand for aging for 6h, then filter Washed with water, dried at 120°C for 12h, and calcined at 650°C for 2h to obtain 5wt.% La 2 o 3 / Al 2 o 3 Composite carrier.

[0033] 2. 5%Ru / 5%La 2 o 3 -Al 2 o 3 Catalyst preparation:

[0034] Immersion method: Measure RuCl 3 Solut...

Embodiment 2

[0037] 1. 10%TiO 2 -Al 2 o 3 Preparation of:

[0038] Immersion method: measure TiCl 4 Solution (0.91mol / L, containing HCl concentration 2mol / L) 1.53mL into a beaker, start stirring in a water bath at 50°C, add NH 3 ·H 2 O solution (1mol / L) to pH=4, then pour 2.001g Al 2 o 3 Carrier, continue to stir for 8 hours and then stand still for 12 hours. After filtering, bake the carrier at 150°C for 12 hours, and roast at 800°C for 4 hours to obtain rutile TiO 2 Modified 10%TiO 2 / Al 2 o 3 Composite carrier;

[0039] Co-precipitation method: weigh 2.3670g AlCl 3 .6H 2 O to the beaker, and measure and add TiCl 4 Solution (0.91mol / L, containing HCl concentration 2mol / L) 1.53mL, start stirring in a water bath at 50°C, add NH 3 ·H 2 O solution (2mol / L) to pH = 7, continue to stir for 4 hours and then let it stand for 8 hours. After filtering, the composite carrier precursor is baked at 150 °C for 12 hours, and roasted at 800 °C for 4 hours to obtain rutile TiO 2 Modified ...

Embodiment 3

[0044] 1. 15%LaAlO 3 -Al 2 o 3 Preparation of:

[0045] Immersion method: Weigh 0.8025g La(NO 3 ) 3 .6H 2 O was fully dissolved in 2.9ml deionized water and poured into 2.0008g Al 2 o 3 Carrier, stir evenly, let stand for 8h, then dry at 120°C for 10h, and finally roast at 900°C for 6h to obtain 15wt.%LaAlO 3 -Al 2 o 3 Composite carrier;

[0046] Co-precipitation method: Weigh 0.8025g La(NO 3 ) 3 .6H 2 O and 8.772g Al(NO 3 ) 3 .9H 2 O was dissolved in 20mL deionized water, and 3mol / L KOH solution was added dropwise with stirring until pH = 7. After dropping, continued to stir for 4h and aged for 8h, filtered and washed, dried at 120°C for 10h, and calcined at 900°C for 6h to obtain 15wt.%LaAlO 3 -Al 2 o 3 Composite carrier.

[0047] 2. 10%Ru / 15%LaAlO 3 -Al 2 o 3 Preparation of:

[0048] Immersion method: Measure RuCl 3 Solution (30.91g Ru / L) 3.59mL, in a water bath at 50°C, NaOH solution (2mol / L) was added dropwise to pH=4, and 1.0005g15%LaAlO 3 -Al...

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Abstract

The invention relates to a preparation method and a catalytic application of a supported noble metal catalyst. Active components are noble metals Ru, Rh and Pd, and a carrier is MxOy or perovskite MAlO3 or spinel MAl2O4. The composite oxide carrier is prepared by an impregnation method or a coprecipitation method and is roasted under a medium-high temperature condition of 650-1200 DEG C ultimately, so that while the formed MxOy, MAlO3 or MAl2O4 or even a mixture thereof has a closer effect with an Al2O3 carrier, the number of defects and holes on the surface of Al2O3 is greatly increased, and thus prepared noble metal nanoparticles have high dispersion degree and strong stability. The catalyst preparation method has the advantages of simple operation, convenience for production and application, good product repeatability, high activity in a carbon dioxide methanation reaction and a carbon monoxide oxidation reaction, strong stability in a storage state and reaction, and quite good application prospects.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to the preparation of nano-scale precious metal catalysts (Ru, Rh, Pd) with high dispersion and good stability, and 2 Methanation reaction and CO oxidation reaction have the characteristics of high activity, good selectivity, and excellent stability. Background technique [0002] Supported nanoscale noble metal (Ru, Rh, Pd) catalysts are a class of materials widely used in heterogeneous catalytic reactions. They have good catalytic performance for many reactions such as carbon monoxide oxidation, carbon monoxide selective oxidation, and carbon dioxide hydromethanation. , Purification of closed environment and industrial gas, purification of hydrogen for fuel cell systems, CO 2 Resource utilization and other aspects have important application prospects. [0003] Alumina is one of the most commonly used, stable, and easy-to-form oxide supports. with Al alone 2 o 3 Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/46B01J23/89B01J23/60B01J23/656C07C9/04C07C1/12B01D53/90B01D53/62
CPCY02A50/20
Inventor 黄延强林清泉王爱琴张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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