Preparation method and application of CN (at) Ma-Mb supported monatomic catalyst

A catalyst and atomic technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve problems such as high toxicity of chromium compounds, carbon deposition in catalysts, and damage to NC carriers, so as to improve conversion rate and selectivity sexual effect

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

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Problems solved by technology

[0004] However, these two types of catalysts have obvious defects: platinum exists in the form of nanoparticles on platinum-based catalysts, and the precious metals are not all exposed on the surface of the catalyst, so the loading capacity is high and the utilization rate is low; chromium compounds are highly toxic and easy to cause environmental pollution , and the continuous reaction time is short in the alkane dehydrogenation reaction, and carbon deposits on the surface of the catalyst during the reaction process require frequent switching between regeneration and catalysis
For industrial production, this time will greatly reduce production efficiency
In addition, the structures of the catalysts disclosed in the above patents are mostly M/N-C structures
The catalyst carriers of the two patents are both NC carriers. The problem with this carrier is that it exists in the form of powder, which cannot quickly transfer mass and heat in ind

Method used

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  • Preparation method and application of CN (at) Ma-Mb supported monatomic catalyst
  • Preparation method and application of CN (at) Ma-Mb supported monatomic catalyst
  • Preparation method and application of CN (at) Ma-Mb supported monatomic catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1, CN@Ir (0.25wt％) Zn (2wt％) / Al 2 O 3 (20200413)

[0063] Take 6.7g of iridium chloride trihydrate and 6.7g of sodium chloride with water to dissolve and dilute to 1200g, then add 167.8g of zinc nitrate hexahydrate to dissolve, add 1Kg of small spherical Al 2 O 3 , soaked for 0.5 hours, drained, and dried at 60°C for 24 hours. Iridium-zinc-supported Al can be prepared 2 O 3 Catalyst, labeled Ir (0.25wt％) Zn (2wt％) / Al 2 O 3 .

[0064] The iridium-zinc catalyst was coated using 2-methylimidazole (2-MI) as the CN precursor. 287.7g of 2-methylimidazole was dissolved in 1200g of water in advance, and the above Ir (0.25wt％) Zn (2wt％) / Al 2 O 3 After soaking for 0.5 hours, take out, drain, dry at 120 °C for 3 hours, and then dry at 600 °C, N 2 The CN-coated iridium-zinc catalyst can be prepared by pyrolysis under protective atmosphere for 3 hours, which is marked as CN@Ir (0.25wt％) Zn (2wt％) / Al 2 O 3 .

Embodiment 2

[0065] Example 2, CN@Ir (0.1wt％) Zn (3wt％) / Al 2 O 3 (200807a)

[0066] Prepare an aqueous solution of Ir with a concentration of 0.005g / g with iridium chloride and sodium chloride in advance, take 20.0g, add 13.6g of zinc nitrate hexahydrate, and use H 2 O was diluted to 110.0 g, followed by the addition of 96.9 g of small spherical Al 2 O 3 , followed by rotary evaporation, until the solvent is completely evaporated and the iridium and zinc species are fully loaded on the Al 2 O 3surface, iridium-zinc-supported Al can be prepared 2 O 3 Catalyst, labeled Ir (0.1wt％) Zn (3wt％) / Al 2 O 3 .

[0067] The iridium-zinc catalyst was coated with 2-methylimidazole (2-MI) as the CN precursor, and the molar ratio of 2-methylimidazole to Zn was 2:1. A 2-methylimidazole aqueous solution with a concentration of 7.53 wt% was pre-configured, 5.0 g was taken, and 5.0 g of Ir was added. (0.1wt％) Zn (3wt％) / Al 2 O 3 After soaking for 0.5 hours, take it out, absorb the remainin...

Embodiment 3

[0068] Example 3, CN@Ir (0.1wt％) Zn (3wt％) / Al 2 O 3 (200807b)

[0069] Ir (0.1wt％) Zn (3wt％) / Al 2 O 3 For the preparation method, see the relevant steps in Example 2. The iridium-zinc catalyst was coated with 2-methylimidazole (2-MI) as the CN precursor, and the molar ratio of 2-methylimidazole to Zn was 3:1. Pre-configured 2-methylimidazole aqueous solution with a concentration of 11.3wt%, take 5.0g, add 5.0g of Ir (0.1wt％) Zn (3wt％) / Al 2 O 3 After soaking for 0.5 hours, take it out, absorb the remaining liquid with paper towels, dry at 120 °C for 3 hours, and then heat it at 600 °C under N 2 The CN-coated iridium-zinc catalyst can be prepared by pyrolysis under protective atmosphere for 3 hours, which is marked as CN@Ir (0.1wt％) Zn (3wt％) / Al 2 O 3 (MI-3).

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Abstract

The invention discloses a preparation method of a CN (at) Ma-Mb metal supported monatomic catalyst, which comprises the following steps: supporting active metals Ma and Mb on a carrier to form a catalyst precursor; adding a ligand to form a complex; and performing pyrolysis to form the CN (at) Ma-Mb metal supported monatomic catalyst. The preparation method of the monatomic catalyst is simple in process and easy to regenerate, the catalytic activity is still kept after regeneration, the conversion rate and selectivity of the catalyst for catalyzing direct dehydrogenation of low-carbon alkane are high, and the monatomic catalyst is suitable for large-scale industrial application.

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 include isobutene, 1-butene, 2-butene, 1,3-butadiene, propylene, ethylene, etc., which 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 Wait. In the petrochemical industry, a large number of low-carbon hydrocarbons are produced in the form of by-products, and corresponding low-carbon olefins can be obtained by dehydrogenation, which has gradually attracted the attention of academia and industry. [0003] The catalytic systems for dehydrogenation of low-carbon hydrocarbons that have been successfully industrialized are mainly supported metal nanoparticle catalytic systems with oxides as carriers. The active metal elements can be platinum, chromium, vana...

Claims

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Application Information

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IPC IPC(8): B01J27/24C07C5/333C07C11/06
CPCB01J27/24B01J35/0073C07C5/3337C07C5/3335C07C2527/24C07C11/06Y02P20/52Y02P20/584
Inventor 李杨连超王敏朵杨洪衬王梦云邓明亮
Owner BEIJING SINGLE ATOM SITE CATALYSIS TECH CO LTD
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