Process for preparing granular active carbon

Abstract

The present invention provides a method for preparing granular activated carbon, comprising the following steps: charring the granular or shaped shell under 400 to 500 degrees centigrade for 3 to 16 hours; under water vapour and superheated water vapour environment, carrying out a first activation, in which the activation temperature is 400 to 900 degrees centigrade, and the activation time is 6 to 16 hours, then a second activation, in which the activation temperature is 800 to 1200 degrees centigrade, and the activation time is 2 to 10 hours; cleaning the activated granular carbon with hydrochloric acid, nitric acid or phosphoric acid, wherein the said acid, the concentration is 0.1-20% by wt, the cleaning temperature is 50 to 120 degrees centigrade, and the cleaning time is 0.2 to 16 hours; washing the granular carbon cleaned by acid in the foremenioned step with deionized water to be neutral, then drying and screening it to obtain finished activated carbon. The activated carbon prepared from the present invention has both superior specific surface and superior strength, is especially suitable for serving as support of the supported catalyst.

Description

technical field

[0001] The invention relates to a method for manufacturing granular activated carbon. Background technique

[0002] Activated carbon is a porous, high specific surface material with excellent adsorption properties, and is often used as an adsorbent in industrial purification and chemical recovery processes. At the same time, due to the stable chemical properties of activated carbon, it is an inert material, so activated carbon is often used as a supported catalyst, especially the carrier of noble metal catalysts. The specific surface of activated carbon has a great relationship with the performance of the catalyst. Generally speaking, a high specific surface helps to improve the activity of the catalyst. But at the same time, in order to prevent the active components of the catalyst from being stripped from the catalyst with the crushing or wear of the carrier, thereby reducing the content of the active components and affecting the activity of the catalyst. ...