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Alkaline high-dispersion loaded Pt-based nano-catalyst and preparation and application thereof

A nano-catalyst, high-dispersion technology, applied in catalyst activation/preparation, physical/chemical process catalyst, nanotechnology, etc., to achieve the effects of high dispersion, high activity, and high conversion rate

Inactive Publication Date: 2018-09-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the present situation that high temperature, high pressure and addition of lye are required in the process of preparing FDCA by chemical method using HMF as a raw material, and designs and develops a high-dispersion loaded Pt with mild preparation conditions, good selectivity and high conversion rate. Nano-based catalyst

Method used

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  • Alkaline high-dispersion loaded Pt-based nano-catalyst and preparation and application thereof
  • Alkaline high-dispersion loaded Pt-based nano-catalyst and preparation and application thereof
  • Alkaline high-dispersion loaded Pt-based nano-catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A: Prepare 80mL of cerium nitrate solution with a concentration of 0.05mol / L, then add 0.004mol of melamine, ultrasonicate for 3-5min, and then prepare 80mL of sodium borohydride solution with a concentration of 0.5mol / L; add the two solutions at the same time at a speed of Thoroughly stir in a colloid mill at 4000r / min for 5min.

[0028]B: Transfer the obtained white suspension to a 250mL three-neck flask, conduct hydrothermal crystallization at 90°C for 12h, centrifuge, wash until neutral, and dry at 70°C to obtain CeO 2 / melamine composite precursor material.

[0029] C: will get CeO 2 / melamine composite precursor is placed in a muffle furnace, roasted under air atmosphere conditions, heated to 500 °C at a heating rate of 5 °C / min and kept for 2 h, and after natural cooling to room temperature, CeO 2 - CN carrier material.

[0030] D: Accurately weigh 0.5g CeO 2 -CN carrier material was dispersed in 50mL deionized water, and 3.98mL19.3mmol / L of H 2 PtCl 6 solu...

Embodiment 2

[0033] A: Prepare 80mL of zirconium nitrate solution with a concentration of 0.06mol / L, then add 0.0048mol of melamine, ultrasonicate for 3-5min, and then prepare 80mL of sodium borohydride solution with a concentration of 0.6mol / L; At the same time, it was added to a colloid mill with a rotation speed of 4000r / min and fully stirred for 5 minutes.

[0034] B: Transfer the obtained white suspension to a 250mL three-necked flask, conduct hydrothermal crystallization at 80°C for 12h, centrifuge, wash until neutral, and dry at 70°C to obtain ZrO 2 / melamine composite precursor material.

[0035] C: ZrO will be obtained 2 / melamine composite precursor is placed in a muffle furnace, roasted under air atmosphere conditions, heated to 500°C at a heating rate of 5°C / min and kept for 2h, and after being naturally cooled to room temperature, ZrO 2 - CN carrier material.

[0036] D: Accurately weigh 0.5g ZrO 2 -CN carrier material was dispersed in 50mL deionized water, and 2.66mL19.3m...

Embodiment 3

[0039] A: Prepare 80 mL of nickel nitrate solution with a concentration of 0.1 mol / L, then add 0.008 mol of melamine, ultrasonicate for 3 to 5 minutes, and prepare 80 mL of sodium borohydride solution with a concentration of 1 mol / L; Add it into a colloid mill with a rotating speed of 4000r / min and stir well for 5min.

[0040] B: Transfer the obtained light green suspension to a 250mL three-neck flask for hydrothermal crystallization at 70°C for 12h, centrifuge, wash until neutral, and dry at 70°C to obtain a NiO / melamine composite precursor Material.

[0041] C: The obtained NiO / melamine composite precursor is placed in a muffle furnace, roasted in an air atmosphere, heated to 600°C at a heating rate of 5°C / min and kept for 2h, and after being naturally cooled to room temperature, NiO is obtained - CN carrier material.

[0042] D: Accurately weigh 0.5g of NiO-CN carrier material and disperse it in 50mL of deionized water, add 6.64mL of 19.3mmol / L H 2 PtCl 6 solution, tran...

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Abstract

The invention provides an alkaline high-dispersion loaded Pt-based nano-catalyst and preparation and application thereof. The catalyst is represented as Pt / MO-CN, wherein MO is one of CeO2, ZrO2, ZnOand NiO, and the mass percent of Pt is 1% to 5%; the particle size of Pt is 2nm to 4nm; and the mass ratio of CN to MO is 0.2 to 1.2. The method comprises the steps of introducing melamine into metalnitrate, which serves as a raw material, and NaBH4 which serves as a precipitant so as to obtain a metal oxide / melamine precursor, carrying out roasting treatment so as to obtain an alkaline-bit-enriched MO-CN carrier with high specific surface area, highly uniformly dispersing noble metal Pt in the surface of the MO-CN carrier through a liquid-phase reduction method by using NaBH4, , thereby obtaining the Pt / MO-CN. According to the catalyst, under the conditions of no additional alkali liquor introduction, relatively low O2 pressure and relatively low reaction temperature, 2,5-furan diformicacid can be prepared through rapid, efficient and selective catalyzed oxidation of 5-hydroxymethyl furfural, the conversion ratio and selectivity separately reach up to 92% to 98% and 89% to 99%, andthe catalyst has a relatively high application value and prospect.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to an alkaline highly dispersed supported Pt-based nanocatalyst and a preparation method thereof, which is suitable for the selective catalytic oxidation of 5-hydroxymethylfurfural to prepare 2,5- furandicarboxylic acid. technical background [0002] Energy shortage and environmental crisis are two major problems restricting the economic and social development of the world today. Excessive consumption of energy has exposed the scarcity of resources and the contradiction between supply and demand has become increasingly prominent. Therefore, countries all over the world have adopted various approaches and measures to improve energy utilization and actively seek new ways of energy utilization. Compared with fossil energy, biomass energy has gradually become an important alternative energy due to its characteristics of renewable, abundant resources, cheap, and eco-friendly....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/03B01J37/08B01J37/16B01J37/10B01J37/34C07D307/68B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C07D307/68B01J27/24B01J37/031B01J37/082B01J37/10B01J37/16B01J37/343B01J35/394
Inventor 范国利柯长轩李峰
Owner BEIJING UNIV OF CHEM TECH
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