Stabilizing treatment method of platinum particles of loading type platinum catalyst

A stabilization treatment, platinum catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. High temperature sintering, inability to know high temperature stability, etc

Inactive Publication Date: 2015-06-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention does not report the further stabilization treatment of the supported catalyst, so it is impossible to know its high temperature stability
[0006] Therefore, no matter from the perspective of industrial production or laboratory practice, there is still a lack of a low-cost method for improving the high-temperature sintering resistance of supported metal platinum catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The platinum particle stabilization treatment method of the supported platinum catalyst uses the supported platinum catalyst as a raw material for stabilization treatment, which specifically includes the following steps:

[0045] Step 1, raw material preparation; specific method is as follows:

[0046] Supported platinum catalyst, the supported platinum catalyst is SiO 2 Supported platinum catalyst (Pt / SiO 2 ), the platinum content is 7.5%, the supported platinum catalyst is granular, and the particle size is 40-80 mesh; 10g in total.

[0047] Sulfur source solution: diethyl sulfide-ethanol mixture containing diethyl sulfide 15.3% (mol fraction); the total mass is 92 g.

[0048] Silicon source solution: ethyl orthosilicate-ethanol mixture containing 75% (mol fraction) of ethyl orthosilicate, mass 23g.

[0049] Ammonia, with NH 3 The mass fraction is 12%; the dosage is 489g.

[0050] o 2 gas source, O 2 10% mole fraction of O 2 -N 2 mixed gas.

[0051] h 2 Gas...

Embodiment 2

[0083] The difference with Embodiment 1 is:

[0084] The supported platinum catalyst of step 1 is Al 2 o 3 Supported platinum catalyst (Pt / Al 2 o 3 ); the particle size is 20-40 mesh; the sulfur source solution is a thiophene-propanol mixture containing 5.1% (mol fraction) of thiophene; H 2 The gas source is containing H 2 5%H 2 -N 2 mixed composition;

[0085] H of step 2 2 The flow rate of the gas source is 128mL / min;

[0086] The soaking temperature in step 3 is 70°C; the soaking time is 3h;

[0087] The gas flow rate of the inert gas source of step 6 is 110ml / min;

[0088] H of step 7 2The flow rate of the gas source is 128mL / min.

[0089] Embodiment 2 The anti-sintering stability of the supported platinum catalyst after the stabilization treatment and the untreated supported platinum catalyst under high temperature and different atmospheres is compared with the following effects:

[0090] Weigh untreated Pt / Al 2 o 3 Raw material 2g (numbering is #11); Weigh...

Embodiment 3

[0096] The difference with Embodiment 1 is:

[0097] Step 2 access to O 2 After the gas source, its flow rate was controlled to 15mL / min; the reaction tube was heated so that the temperature of the raw platinum catalyst layer measured by the thermocouple was 450°C.

[0098] In step 3, the soaking temperature is 75° C.; the soaking time is 3 hours.

[0099] In step 4, the temperature of the rotary evaporator is controlled to be 170° C., and the evaporation time is 2 hours.

[0100] Step 5 soaking time is 16h.

[0101] The holding time of step 6 is 4h.

[0102] Step 7 access to O 2 After the gas source, its flow rate was controlled to 15mL / min; the reaction tube was heated so that the temperature of the raw platinum catalyst layer measured by the thermocouple was 450°C.

[0103] Embodiment 3 The anti-sintering stability of the supported platinum catalyst after the stabilization treatment and the untreated supported platinum catalyst at high temperature and different atmosph...

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Abstract

The invention belongs to the field of industrial catalysts, and particularly relates to a stabilizing treatment method of platinum particles of a loading type platinum catalyst. The stabilizing treatment method can be used for transforming the loading type platinum catalyst into a loading type platinum catalyst with high high-temperature sintering resistance by taking the loading type platinum catalyst as a raw material and stably treating the platinum particles positioned on a carrier and specifically comprises the following several steps: 1, preparing the raw material; 2, carrying out oxygen-hydrogen calcination for the first time; 3, soaking through a sulfur source solution; 4, evaporating; 5, steeping through a silicon source solution; 6, hydrolyzing; and 7, carrying out oxygen-hydrogen calcination for the second time. When the loading type platinum catalyst treated through the stabilizing treatment method is used at high temperature and different atmospheres for a long time, the metal platinum particles positioned on the surface of the loading type platinum catalyst are greatly enhanced in anti-sintering capacity. The technical scheme is as follows: only common equipment needs to be used; the stabilizing treatment method disclosed by the invention achieves more easiness for step operation and is suitable for large-scale production and industrialized application.

Description

technical field [0001] The invention belongs to the field of industrial catalysts, and specifically relates to a method for stabilizing platinum particles of a supported platinum catalyst; using a supported platinum catalyst as a raw material, the platinum particles on the carrier are stabilized to convert them into Supported platinum catalyst with high temperature resistance to sintering. Background technique [0002] Platinum (Pt)-based catalysts play a very important role in the field of heterogeneous catalysis, especially in the catalytic process of the petrochemical industry. They are often used in production processes and experiments with large industrial scales such as hydrogenation, dehydrogenation, oxidation, and electrocatalysis. room research. Because platinum is expensive, platinum catalysts are usually prepared as porous carrier-supported catalysts, and platinum metal is dispersed on the surface of the carrier in the form of nanoparticles. The smaller the size...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J37/00B01J37/08B01J37/20
Inventor 林旭锋席燕燕严魏宁许路遥火玉龙
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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