Contrast-comparison paragraph by Kateryna Glevatska

Activation of carbon materials is the most important stage in the generation process of activated carbon materials. For activation of carbon materials one of two methods can be used: chemical activation or activation by gases. Initial materials for chemical activation are non-carbonized materials, such as peat or chips. In contrast, for activation by gases only carbonized materials can be used, for example, peat charcoal or brown coal. Activation agents are also different. For chemical activation phosphoric acid, zinc chloride or sulfate acid can be applied. On the other hand, for activation by gases only water vapor, oxygen or air are used. The most important factor, which determines main properties of activated material, is temperature condition. In chemical activation the temperature is 500-600ºC, whereas in activation by gases – 800-900ºC. So, these two main methods have many differences, but both of them are widely used for generation activated carbon materials.