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Metal supported catalyst and HCN synthesis method

A supported catalyst and metal technology, which is applied in the field of plasma chemical synthesis, can solve unrelated problems and achieve the effects of simple process, green method and mild reaction conditions

Active Publication Date: 2016-03-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In summary, the existing patents and published literature do not involve CH 4 and NH 3 The mixed gas is used as raw material to synthesize HCN under the combined action of plasma and catalyst

Method used

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  • Metal supported catalyst and HCN synthesis method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Repeat comparative example 1, the iron catalyst (expressed as Fe / SiO 2) is filled in the discharge area of ​​the wire barrel type dielectric barrier discharge plasma reactor. The catalyst particles were of irregular shape (20-40 mesh) with an active ingredient loading of 10% by weight based on elemental iron (Fe). The discharge parameters are set as follows: discharge voltage 13kV (peak-peak value), discharge frequency 12kHz, high-voltage power supply 35W. After the reaction was stabilized, the wall temperature of the reactor was stabilized at 300°C. At this time, CH 4 Conversion rate 10%, HCN selectivity 45%.

Embodiment 2

[0035] Repeat Example 1, the platinum catalyst (expressed as Pt / SiO 2 ) is filled in the discharge area of ​​the wire barrel type dielectric barrier discharge plasma reactor. The catalyst particles were of irregular shape (20-40 mesh) with an active ingredient loading of 2% by weight based on elemental platinum (Pt). The discharge parameters are set as follows: discharge voltage 13kV (peak-peak value), discharge frequency 12kHz, high-voltage power supply 34W. After the reaction was stabilized, the wall temperature of the reactor was stabilized at 300°C. At this time, CH 4 Conversion rate 9%, HCN selectivity 70%.

Embodiment 3

[0037] Example 1 was repeated, with 6 g of silica-supported sodium catalyst (expressed as Na / SiO 2 ) is filled in the discharge area of ​​the wire barrel type dielectric barrier discharge plasma reactor. The catalyst particles were of irregular shape (20-40 mesh) with an active ingredient loading of 10% by weight expressed as elemental sodium (Na). The discharge parameters are set as follows: discharge voltage 13kV (peak-peak value), discharge frequency 12kHz, high-voltage power supply 36W. After the reaction was stabilized, the wall temperature of the reactor was stabilized at 300°C. At this time, CH 4 Conversion rate 6%, HCN selectivity 30%.

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Abstract

The invention belongs to the technical field of plasma chemical synthesis, and provides a metal supported catalyst and an HCN synthesis method. The metal supported catalyst comprises an active component and a carrier, the active component is one or two or above of non-noble metals, alkali metals, noble metals and rare earth metals, and the weight percentage of the active component in the catalyst is 0.4-50%; and a ratio of the equivalent diameter of carrier particles to the internal diameter of a reactor is 0.01-0.4. The retention time of methane and ammonia gas in a discharge zone is 0.01-100s, the reaction temperature is 200-650DEG C, the reaction pressure is -0.06 - 0.2 Mpa, and a molar ratio of methane to the ammonia gas in the reaction system is 0-10. The method has the advantages of mild reaction conditions, implementation at a low temperature under normal pressure, cheap and easily available raw materials comprising methane and ammonia gas, and realization of simple flow and environmental protection because the plasma catalytic synthesis method is a one-step direct synthesis method.

Description

technical field [0001] The invention belongs to the technical field of plasma chemical synthesis, and relates to a metal-loaded catalyst and a method for synthesizing HCN. Background technique [0002] Hydrogen cyanide (HCN) is an important chemical that can be used in the synthesis of adiponitrile, acetone cyanohydrin, sodium cyanide, methionine, cyanuric chloride, aminocarboxylic acid chelating agents and nitrilotriacetic acid, etc. [0003] The industry mainly adopts formamide method, Schwanigan method (Schwanigan), BMA method and Angle method to produce HCN. [0004] Formamide method: using carbon monoxide and ammonia as raw materials, at 450-590 ° C, with Al 2 o 3 Based on the aluminosilicate catalyst, HCN was prepared in three steps (①CO+CH 3 OH→HCOOCH 3 ;②HCOOCH 3 +NH 3 →CH 3 OH+HCONH 2 ;③ HCONH 2 →HCN+H 2 O). [0005] Schwanigan method: Propane (or methane) and ammonia are used as raw materials to generate HCN under the condition of no catalyst and high te...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J23/42B01J23/04B01J23/72B01J23/30B01J23/10B01J23/83B01J23/888B01J29/89C01C3/02
CPCB01J23/002B01J23/04B01J23/10B01J23/30B01J23/42B01J23/72B01J23/745B01J23/83B01J23/8885B01J29/89B01J2523/00C01C3/0229B01J2523/842B01J2523/41B01J2523/828B01J2523/12B01J2523/17B01J2523/69B01J2523/3712B01J2523/3706B01J2523/31B01J2523/47
Inventor 郭洪臣张睿王丽闫金辉王旬旬于晓蕾易颜辉
Owner DALIAN UNIV OF TECH
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