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Supported gold catalyst and preparation method thereof

A gold catalyst, supported technology, applied in the field of supported gold catalyst with low load and high activity and its preparation

Inactive Publication Date: 2010-09-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When Zanella et al. investigated the influence of parameters such as deposition time, deposition temperature, gold solution and urea concentration in the HDP method, it was found that measures such as increasing the deposition temperature and urea concentration, and reducing the concentration of gold solution were beneficial to the small particle size Au / TiO 2 The preparation of catalysts, but the HDP method is still only applicable to TiO with a higher isoelectric point (IEP>6) 2 , Al 2 o 3 , CeO 2 Deposition of gold nanoparticles on isocarriers

Method used

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  • Supported gold catalyst and preparation method thereof
  • Supported gold catalyst and preparation method thereof
  • Supported gold catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A: Weigh 61.54g Mg(NO 3 ) 2 ·6H 2 O and 45.02g Al(NO 3 ) 3 9H 2 O was dissolved in deionized water to make 300mL mixed salt solution; then weighed 23.04g NaOH and 25.44g NaOH 2 CO 3 Dissolve in deionized water to make 300mL mixed alkali solution; add the above two mixed solutions into the total back-mixed liquid membrane reactor at the same time, adjust the slit width between the reactor rotor and stator to 0.02mm, the working voltage to 100V, and the rotor speed 4000rpm, add the obtained mixed slurry into the crystallization kettle and stir, keep the temperature of the mixed slurry in the kettle at 95-105°C for reflux crystallization for 6 hours, and obtain the magnesium-aluminum hydrotalcite precursor slurry; the magnesium-aluminum hydrotalcite precursor The slurry was centrifuged and washed to a pH of 7.5, and dried at 90°C for 24 hours to obtain magnesium-aluminum hydrotalcite;

[0024] B: Measure 1.75ml of chloroauric acid solution with a concentration of 10...

Embodiment 2

[0028] A: with embodiment 1;

[0029] B: Measure 3.525ml of chloroauric acid solution with a concentration of 10g / L, 20ml of deionized water, and 0.756g of urea, and add the above substances into a 50ml single-necked flask respectively; after standing for three minutes to dissolve, weigh the magnesium-aluminum hydrotalcite Add 1.0 g to the above single-necked flask; place the single-necked flask in a heat-collecting constant-temperature heating magnetic stirrer, adjust the temperature of the heat-collecting constant-temperature heating magnetic stirrer to 80°C, and keep the constant temperature for 5 hours, then turn off the heat-collecting constant temperature heating magnetic force Stirrer, aging for 2 hours; centrifuge and wash the aged solution until there is no chloride ion in the solution, take out the sample, put it in a 90°C electric constant temperature blast drying oven for drying, and take it out after 12 hours;

[0030] C: with embodiment 1;

[0031] D: Carry out ...

Embodiment 3

[0033] A: with embodiment 1;

[0034] B: Measure 17.5ml of chloroauric acid solution with a concentration of 10g / L, 100ml of deionized water, and 2.523g of urea, respectively add the above substances into a 250ml single-necked flask, let it stand for three minutes to dissolve, and then weigh the magnesium-aluminum hydrotalcite Add 1.0g into a single-necked flask; place the single-necked flask in a collector-type constant-temperature heating magnetic stirrer, adjust the temperature of the collector-type constant-temperature heating magnetic stirrer to 80°C, and keep the constant temperature for 5 hours, then turn off the collector-type constant-temperature heating magnetic stirrer Centrifuge and wash the aged solution until there is no chloride ion in the solution, take out the sample, put it in a 90°C electric constant temperature blast drying oven for drying, and take it out after 12 hours;

[0035] C: with embodiment 1;

[0036] D: Carry out application performance test to ...

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Abstract

The invention discloses a low-carrying-capacity high-activity supported gold catalyst using hydrotalcite as a carrier and a preparation method thereof, which belong to the technical field of catalyst preparation. The preparation method of the supported gold catalyst comprises the following steps of: selecting a hydrotalcite precursor with a higher isoelectric point as the carrier; and using a uniform hydroxyl lattice of the hydrotalcite and different crystal face orientations of the hydrotalcite to ensure that gold atoms with catalytic activity are highly dispersed and are closely anchored on a high-energy crystal face of the hydrotalcite so as to expose more active gold particles. If the catalyst is used for synthesizing phenyl ethylene oxide through catalytic oxidation of styrene, the conversion rate of reactants is high, and the selectivity of products is high.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a low-loaded high-activity supported gold catalyst with hydrotalcite as a carrier and a preparation method thereof. Background technique [0002] Hydrotalcites (LDHs), also known as double hydroxyl complex metal hydroxides, are anionic clays with a general chemical formula [M II 1-x m III x (OH) 2 ] x+ (A n- ) x / n ·yH 2 O, where M II and M III They are divalent and trivalent metal cations respectively, located on the main laminate; A n- is an interlayer anion; x is M III / (M II +M III ) molar ratio; y is the number of interlayer water molecules. LDHs have a layered structure, tunability of layer elements and exchangeability of anions between layers. This special chemical and structural property not only makes it have ion exchange properties, but also has a wide range of applications in many fields such as catalysis, adsorption, ion exchange, electrical material...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J32/00B01J21/10C07D303/04C07D301/19
CPCY02P20/52
Inventor 张法智李波陈涛封常红赵洪月雷晓东
Owner BEIJING UNIV OF CHEM TECH
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