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Supported palladium-based catalyst for synthesizing dimethyl carbonate as well as preparation method and application of supported palladium-based catalyst

A technology of dimethyl carbonate and supported palladium, applied in the field of catalysis, can solve problems such as equipment corrosion and increase cost investment, and achieve the effects of non-corrosiveness, low loading and good stability

Pending Publication Date: 2022-06-28
易高卓新节能技术(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the presence of chloride ions, it will inevitably cause corrosion to the equipment and increase the cost investment

Method used

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  • Supported palladium-based catalyst for synthesizing dimethyl carbonate as well as preparation method and application of supported palladium-based catalyst
  • Supported palladium-based catalyst for synthesizing dimethyl carbonate as well as preparation method and application of supported palladium-based catalyst
  • Supported palladium-based catalyst for synthesizing dimethyl carbonate as well as preparation method and application of supported palladium-based catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 - Preparation of catalyst

[0041] Weigh a certain amount of palladium salt (and auxiliary agent) and add it to 1mL of water or solvent to prepare the first solution, take a certain amount of organic ligand and add it to 10ml of water to prepare an organic ligand aqueous solution, and the organic ligand aqueous solution is continuously Stir for more than 30min, add a certain amount of carrier into the organic ligand aqueous solution to form a second solution, and keep stirring. The first solution is slowly added to the second solution under constant stirring, and thereafter, the reaction is stirred for a certain period of time. After the reaction, the solid-liquid was separated by filtration, the solid was dried in an oven, calcined in an inert gas atmosphere at a certain temperature for 1-4 hours, and then calcined in air for 1-3 hours to obtain a supported palladium-based catalyst sample.

[0042] The relationship between the sample number and the specific ...

Embodiment 2

[0047] Catalytic Performance Evaluation of Catalysts for Preparation of DMC

[0048] Take 1.2ml of the palladium-based catalyst prepared by the above different methods and put it in the constant temperature zone of the fixed-bed reactor (the upper and lower parts are filled with ceramic rings), and evaluate the catalytic activity, product selectivity and stability of the catalyst. The tube length of the fixed-bed reaction 30cm, inner diameter 6mm. After the catalyst is loaded, it is heated with nitrogen at a heating rate of 2°C / min. After reaching the target temperature, the nitrogen is switched to the prepared mixture of CO and methyl nitrite diluted with nitrogen. At the given temperature, pressure and The reaction was carried out at space velocity, and the outlet of the reactor was connected to Agilent gas chromatography for real-time quantitative analysis of product concentration. Agilent gas chromatography was equipped with two detectors, FID and TCD, and the chromatograp...

Embodiment 3

[0052] Example 3 Catalyst Stability Evaluation

[0053] Since the performance of each catalyst is similar, the present invention only takes No. 7 catalyst as an example to evaluate the stability of the catalyst. Measure 1.2 ml of No. 7 catalyst and put it in the constant temperature zone of the fixed-bed reactor (the upper and lower parts are filled with ceramic rings). The fixed-bed reaction tube has a length of 30 cm and an inner diameter of 6 mm. After the catalyst is loaded, it is heated to 175 °C with nitrogen gas at a heating rate of 2 °C / min. After reaching the target temperature, the nitrogen gas is switched to the prepared mixture of CO and methyl nitrite diluted with nitrogen, where the CO concentration is 9.6 %, MN concentration is 12%, airspeed 7000h -1 , the pressure is 0.1MPa (gauge pressure), the product is analyzed by Agilent gas chromatography, Agilent gas chromatography is equipped with two detectors, FID and TCD, and the chromatographic column has a polar c...

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Abstract

The invention discloses a supported palladium-based catalyst for synthesizing dimethyl carbonate as well as a preparation method and application of the supported palladium-based catalyst. According to the catalyst, palladium ions and organic ligands are subjected to bridging coordination, the palladium ions are loaded on a carrier in a high-dispersity mode, and therefore the high-selectivity and high-stability loaded palladium-based catalyst is obtained and can be used for catalyzing the reaction of synthesizing dimethyl carbonate through gas-phase carbonylation of carbon monoxide and methyl nitrite.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a supported palladium-based catalyst, a preparation method and application thereof, and in particular to a supported palladium-based catalyst prepared by bridging metal ions and organic ligands and a preparation method thereof, and its use as Application of the catalyst in catalyzing the gas-phase carbonylation of carbon monoxide (CO) and methyl nitrite (MN) to synthesize dimethyl carbonate (DMC). Background technique [0002] Dimethyl Carbonate (English name Dimethyl Carbonate, referred to as DMC, chemical formula C 3 H 6 O 3 ) is a green and environmentally friendly solvent with good mutual solubility with many organic solvents such as alcohols, ethers and ketones. It is widely used in gasoline additives, high-energy battery electrolytes, water treatment agents, polycarbonates, medicines, pesticides, spices, Synthetic lubricants and other fields. DMC is an important green c...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J23/58B01J23/89C07C68/00C07C69/96
CPCB01J23/44B01J23/58B01J23/8926C07C68/00C07C69/96
Inventor 张慧发徐彬
Owner 易高卓新节能技术(上海)有限公司
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