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A kind of iridium iron single atom 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 the effect of strong anti-CO poisoning ability, increase contact area, and reduce overall cost

Active Publication Date: 2022-06-28
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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  • A kind of iridium iron single atom catalyst, preparation method and application
  • A kind of iridium iron single atom catalyst, preparation method and application
  • A kind of iridium iron single atom catalyst, preparation method and application

Examples

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Comparison scheme
Effect test

Embodiment 1

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

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

Embodiment 2

[0033] Ir single-atom catalyst: the specific implementation conditions are the same as in Example 1, except 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 is changed to 0 mg. At this time, the loading amount 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, except 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 is changed to 0 mg. The Fe loading at this time was 0.24 wt%.

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Abstract

The invention provides an iridium iron single atom catalyst, a preparation method and application. The catalyst carrier is a nitrogen-doped carbon material, and the active components are iridium and iron, and the iridium and iron exist in the form of a single atomic site. The catalyst has high catalytic activity for the hydrorefining of crude terephthalic acid, in which the conversion rate of p-carboxybenzaldehyde is as high as 100%, and has excellent CO toxicity resistance and cycle stability.

Description

technical field [0001] The invention relates to a catalyst for terephthalic acid purification and a preparation method, in particular to an iridium-iron-containing single-atom catalyst and its preparation. Background technique [0002] Polyethylene terephthalate (PET) is an indispensable industrial chemical synthesized from terephthalic acid (PTA) as a monomer. Commercially crude PTA usually contains ppm levels of 4-carboxybenzaldehyde (4-CBA) produced by the oxidation of para-xylene (PX). In order to obtain purified PTA, 4-CBA should be completely removed by hydrotreating to generate p-carboxybenzyl alcohol or benzoic acid. The industrial heterogeneous catalyst for CTA hydrotreating 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 costs. The low utilization rate and unsatisfactory conversion rate of commercial Pd / C are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J23/89B01J35/10C07C51/487C07C63/26
CPCB01J27/24B01J23/8906C07C51/487B01J35/33B01J35/60C07C63/26
Inventor 施建兴
Owner BEIJING SINGLE ATOM SITE CATALYSIS TECH CO LTD
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