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采用气相色谱 质谱联用方法 ,X射线光电子能谱和程序升温脱附方法研究了纳米二氧化钛表面三氯乙烯的气相光催化降解反应 .检测到四种新的含三个碳原子的中间体 ,说明三氯乙烯在反应过程中发生了CC双键的裂解及加成反应 .研究表明 ,水蒸气对降解反应的影响不仅与水蒸气的浓度有关 ,还与催化剂对水的吸收能力有关 .反应副产物在催化剂表面的积累是导致催化剂活性降低的主要原因 .催化剂的X射线光电子能谱显示 ,反应后催化剂表面可能有部分钛原子与反应副产物中的氧原子或氯原子直接键合 ,但钛仍为 + 4价 .
The gas-phase photocatalytic degradation of trichlorethylene on the surface of nanosized titanium dioxide was investigated by gas chromatography-mass spectrometry, X-ray photoelectron spectroscopy and temperature programmed desorption. Four novel intermediates containing three carbon atoms were detected, Trichlorethylene in the reaction occurred during the CC double bond cleavage and addition reaction.Research shows that the impact of steam on the degradation reaction not only with the concentration of water vapor, but also with the water absorption capacity of the catalyst .Reaction by-products The main reason for the decrease of catalyst activity is the accumulation on the catalyst surface.The X-ray photoelectron spectroscopy of the catalyst shows that some of the titanium atoms may directly bond with oxygen atoms or chlorine atoms in the reaction by-products on the surface of the catalyst after the reaction, For +4 price.