Iridium-containing iron monatomic catalyst, preparation method and application

A catalyst and atom technology, applied in the field of iridium-containing iron single-atom catalyst and preparation, can solve the problem of rare research results, achieve strong anti-CO poisoning ability, accelerate charge transfer, and improve the effect of contact area

Active Publication Date: 2022-05-10
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

DACs have made great breakthroughs in electrocatalysis, thermal catalysis, etc., but there are few research results in 4-CBA hydrogenation reaction

Method used

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  • Iridium-containing iron monatomic catalyst, preparation method and application
  • Iridium-containing iron monatomic catalyst, preparation method and application
  • Iridium-containing iron monatomic catalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present embodiment provides a preparation method of multiple crude terephthalic acid hydrotreating IrFe double-atom catalysts and a test process of p-carboxybenzaldehyde hydrogenation performance, which specifically includes the following steps:

[0031] First, dissolve 360 ​​mg of glucose and 1900 mg of hydroxylamine hydrochloride in water / ethanol solution (water:ethanol=1:1), and stir at room temperature for 2 hours until a uniform transparent solution is formed, then weigh 5 mg of iridium chloride respectively and 5 mg of ferric chloride were added thereto, and the above solution was heated at a constant temperature at 80°C and continued to stir for 12 hours until the solution evaporated completely. The obtained product was collected and carbonized at 600 °C for 5 h under an argon atmosphere to obtain an IrFe double-atom catalyst. At this time, the loading amount of Ir was 0.1 wt%, and that of iron was 0.13 wt%.

Embodiment 2

[0033] Ir single-atom catalyst: the specific implementation conditions are the same as in Example 1, the difference is that the amount of iridium chloride in the preparation stage of the catalyst is increased from 5 mg to 10 mg, and the amount of ferric chloride becomes 0 mg. At this time, the loading of Ir was 0.18 wt%.

experiment example 3

[0035] Fe single-atom catalyst: the specific implementation conditions are the same as in Example 1, the difference is that the amount of ferric chloride in the preparation stage of the catalyst is increased from 5 mg to 10 mg, and the amount of iridium chloride becomes 0 mg. At this time, the loading amount of Fe was 0.24 wt%.

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Abstract

The invention provides an iridium-containing iron monatomic catalyst as well as a preparation method and application thereof. A carrier of the catalyst is a nitrogen-doped carbon material, active components of the catalyst are iridium and iron, and the iridium and the iron exist in the form of monatomic sites. The catalyst has high catalytic activity on hydrofining of crude terephthalic acid, the conversion rate of p-carboxybenzaldehyde reaches up to 100%, and the catalyst has excellent CO toxicity resistance and cycling stability.

Description

technical field [0001] The invention relates to a catalyst for refining terephthalic acid and a preparation method, in particular to a single-atom catalyst containing iron iridium and its preparation. Background technique [0002] Polyethylene terephthalate (PET) is an indispensable industrial chemical synthesized from terephthalic acid (PTA) as a monomer. Industrial crude PTA usually contains ppm level of 4-carboxybenzaldehyde (4-CBA) produced by oxidation of p-xylene (PX). To obtain purified PTA, 4-CBA should be completely removed by hydrofinishing to produce p-carboxybenzyl alcohol or benzoic acid, and the commercial heterogeneous catalyst for CTA hydrofinishing is commercial Pd / C. However, the current conversion rate of commercial Pd / C is only about 90%, which cannot meet the needs of industrial refining, and the recycling hydrogenation process will lead to high cost. The low utilization rate and unsatisfactory conversion rate of commercial Pd / C are urgent problems to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/89B01J35/10C07C51/487C07C63/26
CPCB01J27/24B01J23/8906B01J35/0033B01J35/10C07C51/487C07C63/26
Inventor 施建兴
Owner BEIJING SINGLE ATOM SITE CATALYSIS TECH CO LTD
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