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摘要: 对经苯酚吸附和干态催化氧化过程后吸附有苯酚残留物的活性炭载氧化铜和氧化铈(CuCe/AC)进行了氢处理研究。结果表明,氢处理可明显促进残留物的分解,恢复CuCe/AC对苯酚的吸附性能,减少在后续苯酚氧化过程中苯酚脱附量。氢处理温度越高,苯酚吸附容量恢复得越好。但氢处理不能恢复CuCe/AC对苯酚的催化氧化活性,是由于活性组分晶粒长大所致。Abstract: Formation of residues is a common issue in oxidation of phenol over activated carbon (AC) based materials, which results in the decrease of phenol adsorption capacity and phenol oxidation activity of these materials. Therefore, H2treatment of Cu-Ce/AC (activated carbon supported copper and cerium) subjected to phenol adsorption and oxidation and containing phenol oxidation residues were investigated at elevated temperatures. The H2treatment is found effective to promote decomposition of the residues, to recover phenol adsorption capacity of Cu-Ce/AC, and to reduce phenol desorption in the subsequent phenol oxidation process. In the range of 400℃~600℃, the effectiveness of H2treatment increases with the treatment temperature. The H2treatment, however, can not recover the phenol oxidation activity of Cu-Ce/AC due to agglomeration of the active phase.
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Key words:
- catalytic dry oxidation /
- carbonsupported catalyst /
- carbonbased sorbent /
- phenol /
- residue /
- hydrogen treatment
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