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Iridium-loaded heterogeneous catalyst as well as preparation method and application thereof

A heterogeneous catalyst, catalyst technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as low practicability, and achieve the effects of high selectivity, mild reaction conditions and good dispersibility

Active Publication Date: 2021-09-17
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the homogeneous liquid-phase catalytic system needs to add strong bases such as NaOH and NaOEt, and is limited by the difficulty of separating and recovering the catalyst in the noble metal ligand homogeneous catalytic system, so its practicability is low

Method used

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  • Iridium-loaded heterogeneous catalyst as well as preparation method and application thereof
  • Iridium-loaded heterogeneous catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Supported iridium heterogeneous catalyst, wherein iridium is IrCl 3 , the carrier is magnesium aluminum hydrotalcite carrier.

[0022] Preparation method: IrCl 3 The aqueous solution was added dropwise into a test tube equipped with a magnesium aluminum hydrotalcite carrier (MgAl-HT, Mg / Al=4), and ultrasonicated for 0.5 h; the sample in the test tube was transferred to a mortar and ground until dry; it was reduced with sodium borohydride at room temperature, After washing and drying, the corresponding Ir / HT catalyst can be obtained.

[0023] Application method: Add 0.3g of 2% Ir / HT catalyst and 4ml of ethanol into the tank reactor, slowly charge and discharge N 2 Exhaust the air in the reactor, and finally fill it with 1MPa N 2 , put it on a magnetic heating device, stir and heat at 200°C for 10h, and stop the reaction. Cool in an ice water bath.

[0024] Application effect: The conversion rate and product selectivity were analyzed by gas chromatography. The conve...

Embodiment 2

[0026] Supported iridium heterogeneous catalyst, wherein iridium is IrCl 3 , the carrier is magnesium aluminum hydrotalcite carrier.

[0027] Preparation method: IrCl 3 The aqueous solution was added dropwise into a test tube equipped with a magnesium aluminum hydrotalcite carrier (MgAl-HT, Mg / Al=4), and ultrasonicated for 1 h; the sample in the test tube was transferred to a mortar and ground until dry; 2 After reduction, washing and drying, the corresponding Ir / HT catalyst can be obtained.

[0028] Application method: Add 0.3g of 2% Ir / HT catalyst and 2ml of ethanol into the tank reactor, slowly charge and discharge N 2 Exhaust the air in the reactor, and finally fill it with 1MPa N 2 , put it on a magnetic heating device, stir and heat at 200°C for 10h, and stop the reaction. Cool in an ice water bath.

[0029] Effect determination: conversion and product selectivity were analyzed by gas chromatography. The conversion rate of ethanol is 42.3%, the selectivity of butan...

Embodiment 3

[0031] Supported iridium heterogeneous catalyst, where iridium is Na 3 IrCl 6 , the carrier is magnesium aluminum hydrotalcite carrier.

[0032] Preparation method: IrCl 3 Add the aqueous solution dropwise into a test tube equipped with a magnesium aluminum hydrotalcite carrier (MgAl-HT, Mg / Al=4), ultrasonicate for 1 h; transfer the sample in the test tube to a mortar and grind until dry; reduce and wash with sodium borohydride at room temperature , drying, that is, the corresponding Ir / HT catalyst.

[0033] Application method: Add 0.3g of 2% Ir / HT catalyst and 2ml of ethanol into the tank reactor, slowly charge and discharge N 2 Exhaust the air in the reactor, and finally fill it with 1MPa N 2 , put it on a magnetic heating device, stir and heat at 200°C for 10h, and stop the reaction. Cool in an ice water bath.

[0034] Effect determination: conversion and product selectivity were analyzed by gas chromatography. The conversion rate of ethanol is 32.4%, the selectivity...

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Abstract

The invention discloses an iridium-loaded heterogeneous catalyst and a preparation method and application thereof. The catalyst is composed of iridium and a carrier, and the carrier is oxide or hydrotalcite. The iridium-loaded heterogeneous catalyst can be prepared through an impregnation method, and the prepared heterogeneous catalyst can be applied to preparation of higher alcohol biofuel through ethanol carbon-carbon coupling. According to the iridium-loaded heterogeneous catalyst prepared by the invention, the iridium dispersibility is good; and when the catalyst is applied to preparation of higher alcohols through ethanol coupling, the reaction conditions are mild, the higher alcohols with high selectivity are obtained under the conditions of lower reaction temperature and reaction pressure, the highest selectivity of butanol can reach 68.5%, and the highest selectivity of higher alcohols can reach 88.4%.

Description

technical field [0001] The invention relates to a catalyst, in particular to a loaded iridium heterogeneous catalyst and its preparation method and application. Background technique [0002] Clean and efficient conversion of renewable biomass resources to liquid fuels and bulk or high-value fine chemicals has become an important development strategy for many countries. As one of the most important bulk biomass chemical products, ethanol can be obtained by fermenting non-food biomass such as cellulose or cassava. It has been industrially produced in more than 40 countries around the world, and the production rate is increasing by 5% every year. As a clean fuel, ethanol has been promoted as a gasoline blending component in many countries. Higher alcohols prepared by catalytic coupling of ethanol, such as higher alcohol biofuels of n-butanol and longer-chain aliphatic alcohols, compared with ethanol, these higher alcohols have low water solubility, high energy density, low vap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46C07C29/34C07C31/12C07C31/125C10L1/02
CPCB01J23/58C07C29/34C10L1/02B01J35/394C07C31/12C07C31/125Y02E50/10
Inventor 万晓月杨艳辉谢齐张丹戴翼虎周春梅
Owner NANJING UNIV OF TECH
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