Fly ash consists of various metal oxides which can remove SO₂ gas by the catalyst effect. When fly ash is added in the preparation process of pitch-based activated carbon, the pitch particles aggregate and fly ash is embedded in the activated carbon. To increase SO₂ gas removal performance, activated carbon was prepared by surface-treated fly ash and petroleum-based pitch. Carboxyl groups were introduced into the fly ash by malic acid treatment. The introduced carboxyl groups acted as an activation agent to create micropore around the fly ash, and created micropores were exposed to the fly ash outside of the activated carbon. The exposed fly ash increased removal amount of SO₂ gas by a catalytic effect of the metal oxides. The SO₂ gas removal performance improved by 34% because of the catalyst effect of the exposed fly ash and improvement in the micropore structure in the activated carbon.

中文翻译：

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用表面处理的粉煤灰制备沥青基活性炭以去除SO 2气体

粉煤灰由各种金属氧化物组成，这些金属氧化物可以通过催化作用去除SO ₂气体。在沥青基活性炭的制备过程中添加粉煤灰时，沥青颗粒会聚集，并且粉煤灰会嵌入活性炭中。为了提高SO ₂气体的去除性能，通过表面处理的粉煤灰和石油基沥青制备了活性炭。通过苹果酸处理将羧基引入粉煤灰中。引入的羧基充当活化剂以在粉煤灰周围产生微孔，并且所产生的微孔暴露于活性炭之外的粉煤灰中。暴露的飞灰通过金属氧化物的催化作用而增加了SO ₂气体的去除量。SO ₂ 由于暴露的粉煤灰的催化作用和活性炭中微孔结构的改善，除气性能提高了34％。