Cerium, rhenium and phosphorus modified electrolytic silver catalyst as well as preparation method and application of cerium, rhenium and phosphorus modified electrolytic silver catalyst

A technology of electrolytic silver and catalyst, which is applied in the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds, etc. It can solve the problems of reduced selectivity, inability to initiate reactions, low phosphorus modification, and poor suppression of iron poisoning. , to achieve the effect of excellent service life, good anti-iron poisoning ability and good performance

Active Publication Date: 2016-05-11
HUBEI HONGYUAN PHARMA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a low amount of phosphorus modification cannot well inhibit iron poisoning, and a large amount of modification, such as greater than 80ppm, will seriously inhibit the activity of electrolytic silver, resulting in failure to initiate the reaction
[0005] Cesium and rhenium are two additives for modifying supported silver catalysts, which have a good effect in the epoxidation reaction of ethane, but when they are used to modify electrolytic silver, the selectivity decreases, so these two elements cannot be used for Improving the Performance of Electrolytic Silver Catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1. First, the electrolytic silver catalyst is pretreated, 5 grams of electrolytic silver catalyst is put into a stainless steel reactor with a diameter of 14mm, the distilled water is pumped into the gasifier with a metering pump to vaporize, mixed with the preheated air, and then passed through After heating, enter the reaction section to pretreat the electrolytic silver, and the liquid hourly space velocity of distilled water is 20hr -1 , the air flow rate is 0.035M 3 / h, the pretreatment temperature is 600°C, stop the steam after 8 hours of treatment time, and cool and dry under the air flow.

[0028] Dissolve cesium nitrate, perrhenic acid and phosphoric acid in distilled water to make an impregnation solution. The modification amounts of the three elements are: cesium 10ppm; rhenium 800ppm; phosphorus 80ppm. Place the electrolytic silver obtained above in the impregnation solution, dry at 40°C under agitation, then dry at 100°C for 5 hours, and then ba...

Embodiment 2

[0033] Embodiment 2. Adopt method similar to embodiment 1 to carry out pretreatment to electrolytic silver, the liquid hourly space velocity of distilled water is 10hr -1 , the air flow rate is 0.020M 3 / h, the pretreatment temperature is 300°C, stop the steam after 36 hours of treatment time, and cool and dry under the air flow.

[0034] Dissolve cesium sulfate, ammonium perrhenate and ethyl phosphate in distilled water to make an impregnation solution. The modification amounts of the three elements are: cesium 1500ppm; rhenium 100ppm; phosphorus 100ppm. Place the electrolytic silver obtained above in the impregnating solution, dry at 60°C under agitation, then dry at 120°C for 2 hours, and then bake in a muffle furnace at 550°C for 3 hours to obtain electrolytic silver loaded with cesium, rhenium, and phosphorus.

[0035] The electrolytic silver loaded with modified elements is then subjected to a steam heat treatment to obtain the electrolytic silver catalyst #2 decorated...

Embodiment 3

[0039] Embodiment 3. Adopt method similar to embodiment 1 to carry out pretreatment to electrolytic silver, the liquid hourly space velocity of distilled water is 50hr -1 , the air flow rate is 0.055M 3 / h, the pretreatment temperature is 500°C, stop the steam after 12 hours of treatment time, and cool and dry under the air flow.

[0040] Cesium perrhenate and ethyl phosphate were dissolved in distilled water to prepare an impregnation solution, and the modification amounts of the three elements were: cesium 500ppm; rhenium 500ppm; phosphorus 90ppm. Place the electrolytic silver obtained above in the impregnating solution, dry at 50°C under agitation, then dry at 110°C for 4 hours, and then bake in a muffle furnace at 530°C for 3 hours to obtain electrolytic silver loaded with cesium, rhenium, and phosphorus.

[0041] The electrolytic silver loaded with modified elements is then subjected to a steam heat treatment to obtain the electrolytic silver catalyst #3 modified by ces...

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Abstract

The invention belongs to the technical field of chemical catalysts and in particular relates to a cerium, rhenium and phosphorus modified electrolytic silver catalyst as well as a preparation method and application of the cerium, rhenium and phosphorus modified electrolytic silver catalyst. According to the cerium, rhenium and phosphorus modified electrolytic silver catalyst, carrier silver adopts electrolytic silver prepared by an electrolytic process; after the silver is subjected to heat treatment of water steam, crystal face reconstruction occurs to the electrolytic silver and the rough surface becomes smooth; the treated electrolytic silver is immersed and loaded with cerium, rhenium and phosphorus compounds and then is roasted after being dried; then the silver is subjected to heat treatment by the water steam again to prepare the cerium, rhenium and phosphorus modified electrolytic silver catalyst. The cerium, rhenium and phosphorus modified electrolytic silver catalyst can be used for carrying out catalytic oxidation on fatty alcohol or aromatic alcohol to generate corresponding aldehyde or ketone in one step; compared with the electrolytic silver catalyst applied in the current industry, the cerium, rhenium and phosphorus modified electrolytic silver catalyst has a very good iron poisoning resisting property.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, and in particular relates to an electrolytic silver catalyst modified by cesium, rhenium and phosphorus, a preparation method and application thereof. Background technique [0002] Electrolytic silver has been used as a catalyst for the synthesis of corresponding aldehydes or ketones by gas-phase oxidation of alcohols for many years. At present, electrolytic silver catalysts are used in the production of formaldehyde by air oxidation of methanol and the synthesis of glyoxal by air oxidation of ethylene glycol. The electrolytic silver catalyst can be purchased directly from the market, and can also be easily prepared by electrolysis, such as U.S. Patent No. 5,135,624, which describes silver nitrate of 5 to 100 g / L as the electrolyte, pH 1 to 4, and electrolysis temperature of 10 to 10. 80℃, the current density is 100~3000A / m 2 A method for preparing an electrocrystallized silver cataly...

Claims

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Application Information

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IPC IPC(8): B01J27/187C07C45/38C07C49/185C07C47/228C07C67/313C07C69/716
CPCB01J27/187C07C45/38C07C67/313C07C49/185C07C47/228C07C69/716
Inventor 邓支华付义发周拥军徐华龙沈伟秦枫周瑞祺
Owner HUBEI HONGYUAN PHARMA
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