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Preparation method of palladium carbon catalyst

A palladium-carbon catalyst and palladium chloride technology are applied in the fields of synthetic resins and plastics to achieve the effects of promoting dispersion, increasing the load area and improving catalytic activity

Inactive Publication Date: 2017-05-31
SHAANXI HI-TECH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these studies focus on the catalyst activity and the chemical properties of the support surface, while the reasons why hydrogen peroxide pretreatment changes the microstructure of the support activated carbon and thus affects the performance of the catalyst are rarely paid attention to.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Pretreatment

[0021] Wash 200 g of coconut shell activated carbon with 500 mL of hydrogen peroxide solution for 2 h at 25 °C; wash with deionized water until neutral, and then dry it in a constant temperature drying oven for later use;

[0022] (2) Preparation of Palladium Carbon Catalyst

[0023] Weigh 1.68 g of palladium chloride to dissolve; pour the obtained dark brown liquid into an aqueous solution containing 1.44 g of oxalic acid, stir well and stabilize for 2-3 h, add 0.5 g of dodecyltrimethylammonium bromide, stir well 200 g of pretreated activated carbon is impregnated with a palladium-containing solution for 3 to 3.2 h to obtain a catalyst precursor; the catalyst precursor is added dropwise to an aqueous solution of sodium borohydride at room temperature, and soaked for 2 to 3 h at room temperature; the liquid is removed by filtration, Wash the solid with pure water to neutrality and dry to obtain the palladium carbon catalyst.

[0024] The mass fracti...

Embodiment 2

[0026] (1) Pretreatment

[0027] Wash 200 g of coconut shell activated carbon with 500 mL of hydrogen peroxide solution for 2 h at 25 °C; wash with deionized water until neutral, and then dry it in a constant temperature drying oven for later use;

[0028] (2) Preparation of Palladium Carbon Catalyst

[0029] Weigh 1.68 g of palladium chloride to dissolve; pour the obtained dark brown liquid into an aqueous solution containing 1.44 g of oxalic acid, stir well and stabilize for 2-3 h, add 0.5 g of dodecyltrimethylammonium bromide, stir well 200 g of pretreated activated carbon is impregnated with a palladium-containing solution for 3 to 3.2 h to obtain a catalyst precursor; the catalyst precursor is added dropwise to an aqueous solution of sodium borohydride at room temperature, and soaked for 2 to 3 h at room temperature; the liquid is removed by filtration, Wash the solid with pure water to neutrality and dry to obtain the palladium carbon catalyst.

[0030] The mass fracti...

Embodiment 3

[0033] (1) Pretreatment

[0034] Wash 200 g of coconut shell activated carbon with 500 mL of hydrogen peroxide solution for 2 h at 25 °C; wash with deionized water until neutral, and then dry it in a constant temperature drying oven for later use;

[0035] (2) Preparation of Palladium Carbon Catalyst

[0036] Weigh 1.68 g of palladium chloride to dissolve; pour the obtained dark brown liquid into an aqueous solution containing 1.44 g of oxalic acid, stir well and stabilize for 2-3 h, add 0.5 g of dodecyltrimethylammonium bromide, stir well 200 g of pretreated activated carbon is impregnated with a palladium-containing solution for 3 to 3.2 h to obtain a catalyst precursor; the catalyst precursor is added dropwise to an aqueous solution of sodium borohydride at room temperature, and soaked for 2 to 3 h at room temperature; the liquid is removed by filtration, Wash the solid with pure water to neutrality and dry to obtain the palladium carbon catalyst.

[0037] The mass fracti...

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PUM

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Abstract

The invention relates to the technical fields of synthetic resins and plastics, and specifically relates to a preparation method of a palladium carbon catalyst. The preparation method of the palladium carbon catalyst comprises the following steps: (1) pretreating; and (2) preparing the palladium carbon catalyst. After hydrogen peroxide is used for treating an active carbon carrier, the activity of the obtained palladium carbon catalyst is firstly increased and then reduced along the concentration of the hydrogen peroxide; the hydrogen peroxide pretreatment enables the mean pore size and the mesopore volume of the palladium carbon catalyst to be increased; the hydrogen peroxide treatment can introduce an oxygen element to the carrier surface; the hydrogen peroxide pretreatment has no influence to the phase of the palladium carbon catalyst; the hydrogen peroxide pretreatment can increase the effective load area of active carbon and introduces an oxidizing group to promote the dispersion of palladium in the carrier, and the catalytic activity is improved.

Description

technical field [0001] The invention relates to the technical field of synthetic resins and plastics, in particular to a preparation method of a palladium-carbon catalyst. Background technique [0002] Purified terephthalic acid is widely used in chemical fiber, light industry, electronics, construction and other industries, among which, it is mainly used in the production of polyethylene terephthalate. In 2011, the output of purified terephthalic acid in my country reached 16 480 kt, and the demand is huge. The production of purified terephthalic acid mostly adopts the Amoco process route, in which palladium is selected as the active component of the hydrofining catalyst and activated carbon is used as the carrier. Palladium carbon catalyst is a supported catalyst formed by loading metal palladium (active component) in activated carbon in a certain way, and it is also a widely used catalyst. The palladium-carbon catalyst required for the refining reaction is the core of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44
CPCB01J23/44
Inventor 王耀斌
Owner SHAANXI HI-TECH IND CO LTD
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