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Method for treating, activating and regenerating Ma-Mb metal supported catalyst

A technology of supported catalysts and treatment methods, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Burning regeneration and other problems, to achieve the effect of simple process, stable catalyst, direct dehydrogenation conversion rate and selectivity improvement

Active Publication Date: 2022-07-01
BEIJING SINGLE ATOM SITE CATALYSIS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dehydrogenation reaction of low-carbon alkanes is often accompanied by serious coking problems, and it is necessary to continuously regenerate the coked catalyst. However, CN-modified noble metal single-atom catalysts often have disadvantages such as complicated preparation process and difficulty in industrial coking regeneration after the catalyst is coked. , limiting its further industrial promotion

Method used

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  • Method for treating, activating and regenerating Ma-Mb metal supported catalyst
  • Method for treating, activating and regenerating Ma-Mb metal supported catalyst
  • Method for treating, activating and regenerating Ma-Mb metal supported catalyst

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0053] Preparation Example 1: Preparation of Active Metal / Zinc Supported Catalyst

[0054] 1.1 Ir (0.1wt％) Zn (3wt％) / Al 2 O 3

[0055] Weigh IrCl 3 ·3H 2 0.5g of O and NaCl, 19g of water was added, and the solution was completely dissolved at 80°C. Take more than 7.4g solution, add 16.4g Zn(NO 3 ) 2 ·6H 2 O, after dissolving, make up to the saturated immersion volume of the pellets. An equal volume of the above immersion solution was immersed on 96.9 g alumina pellets, and dried at 120° C. overnight. Obtained iridium zinc catalyst (Ir 0.1wt%; Zn 3wt%), marked as Ir (0.1wt％) Zn (3wt％) / Al 2 O 3 .

[0056] Ir (0.3wt％) Zn (3wt％) / Al 2 O 3

[0057] 50g alumina pellets, 8.25g Zn(NO 3 ) 2 ·6H 2 O was dissolved in water and made up to the saturated impregnation volume of the pellet, impregnated with equal volume, aged at room temperature for 6 h, dried at 120 °C overnight, calcined at 600 °C for 4 h, and took 10 g of the sample. Weigh IrCl 3 ·3H2 0.5g of O a...

preparation Embodiment 2

[0086] Preparation Example 2: Catalyst regeneration pretreatment method

[0087] In this experiment, the catalyst was regenerated, and the catalyst to be treated was calcined at 400-450 °C and 49.8 mL / min of air for 3 hours to form a regenerated catalyst.

Embodiment 1

[0095] 1 g of the iridium-zinc catalyst (Ir 0.1 wt %; Zn 3 wt %) obtained in Preparation Example 1.1 was weighed and treated at 500° C. for 30 min under a 100% ammonia gas atmosphere. At 600°C, pass pure propane gas (volume space velocity: 1000h) -1 ) reaction to test the conversion and selectivity of the propane direct catalytic dehydrogenation reaction.

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Abstract

The invention relates to a method for treating, activating and regenerating an Ma-Mb metal supported catalyst, which comprises the following steps: treating the Ma-Mb metal supported catalyst with ammonia or a nitrogen-containing organic matter at 10-700 DEG C, the Ma metal is an active metal and is selected from one or more of noble metal atoms or transition metals, the carrier is an industrial common porous catalyst, and the catalyst is a metal-metal catalyst or a metal-metal catalyst or a metal-metal catalyst or a metal-metal catalyst or a metal-metal catalyst or a metal-metal catalyst or a metal-metal catalyst or a metal-metal catalyst or a metal-metal catalyst or a metal-metal catalyst. Wherein the Ma metal is dispersed on the carrier in a monatomic site state. According to the Ma-Mb metal supported noble metal / zinc catalyst treated by the method, the direct dehydrogenation conversion rate and selectivity of the catalyst for catalyzing low-carbon alkane are remarkably improved, the preparation method of the catalyst is simple in process, the catalytic activity is still kept after regeneration, and the catalyst can be applied to large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and particularly relates to an alkane dehydrogenation catalyst. Background technique [0002] Low-carbon olefins are the basic raw materials of petrochemical industry, and are widely used in the production of organic chemical raw materials, resin rubber plastics, synthetic gasoline, etc. In the past, light olefins were mainly sourced by by-products of catalytic cracking (FCC) units in the petroleum industry. In recent years, the global demand for light olefins has been increasingly disparity between the production capacity of traditional sources and traditional sources. Taking China as an example, the domestic consumption of propylene in 2015 was 30.4 million tons, of which 2.76 million tons were imported. With the increasingly mature technology of shale gas dehydrogenation to produce low-carbon olefins in the United States, the production cost of low-carbon alkanes dehydrogenatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/26B01J23/34B01J23/60B01J23/80B01J23/89B01J23/96B01J27/24B01J29/12B01J29/90B01J35/00B01J37/08C07C5/333C07C11/06
CPCB01J23/60B01J23/26B01J23/34B01J23/80B01J23/10B01J23/8953B01J23/8913B01J29/126B01J29/90B01J23/96B01J27/24B01J37/082B01J37/08C07C5/3337B01J2229/18B01J2229/34B01J35/391C07C11/06Y02P20/52Y02P20/584
Inventor 连超李杨施建兴王梦云杨洪衬邓明亮王敏朵
Owner BEIJING SINGLE ATOM SITE CATALYSIS TECH CO LTD
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