Catalytic oxidation behavior of phenol adsorbed on Cu-Ce/AC catalyst-sorbent
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摘要: 对活性炭载氧化铜和氧化铈（Cu-Ce/AC）吸附催化剂在连续吸附-催化氧化苯酚循环过程中的催化氧化活性和失活原因进行了研究。结果表明，Cu-Ce/AC的苯酚吸附性能和催化氧化活性随着吸附催化氧化循环次数的增加而逐渐降低，经5次循环后，苯酚的初始氧化温度提高约25℃。通过对使用过的CuCe/ACs进行XPS、ICP分析, 发现Ce和Cu的流失较小，苯酚残留物覆盖表面Ce和Cu是苯酚催化氧化活性降低的主要原因，残留物主要含有C—O—C和C—OH等官能团。Abstract: Catalytic activity and deactivation of a Cu-Ce/AC (activated carbon supported copper and cerium) catalyst-sorbent for oxidation of adsorbed phenol was investigated. Results show that phenol adsorption capacity and oxidation activity of Cu-Ce/AC decrease with an increase in adsorption-oxidation cycles. Initial phenol oxidation temperature of Cu-Ce/AC increases by 25℃ in 5 cycles. The deactivation of the catalyst is attributed to the formation of organic residues from oxidative coupling of phenol, which covers the Ce and Cu sites on the surface. C—O—C and C—OH groups were observed in the residues.
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Key words:
- catalytic dry oxidation /
- carbon-supported catalyst /
- carbon-based sorbent /
- phenol /
- deactivation
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