TiO2 coating types influencing the role of water vapor on the photocatalytic oxidation of methyl ethyl ketone in the gas phase
TiO2 coating types influencing the role of water vapor on the photocatalytic oxidation of methyl ethyl ketone in the gas phase
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DOI：
10.1016/j.apcatb.2005.02.011
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发表时间：
2005-08
影响因子：
22.1
通讯作者：
C. Raillard;V. Héquet;P. Cloirec;J. Legrand
中科院分区：
文献类型：
--
作者：
C. Raillard;V. Héquet;P. Cloirec;J. Legrand
采用A、B、C、D四种tio2基材料，研究了水蒸气对气态甲基乙基酮（MEK）气固吸附和非均相光催化氧化的影响。两种光催化剂（A和B）由粉末tio2沉积在两种不同的载体（普通玻璃纤维和无纺布纤维素纤维）上构成。另一种（C和D）是由涂在玻璃基板上的tio2薄膜组成的。采用Langmuir-Hinshelwood模型研究了初始时间水蒸气对四种光催化材料MEK初始转化率的影响。在验证模型假设的浓度范围内，计算了干燥和潮湿气氛下的吸附常数K和动力学常数K。当相对湿度增加时，这些常数的演化表明水蒸气的作用随沉积TiO2的形式（粉末和薄膜）的不同而不同。
Four TiO2-based materials, named A, B, C and D, are used to investigate the influence of water vapor on the gas–solid adsorption and heterogeneous photocatalytic oxidation of gaseous methyl ethyl ketone (MEK). Two of the photocatalysts (A and B) are constituted of powdered TiO2deposited onto two different supports (ordinary glass and non-woven cellulose fibers). The other ones (C and D) are composed of a thin film of TiO2coated on glass substrates. The effect of water vapor on MEK initial conversion rates is studied for the four photocatalytic materials using the Langmuir–Hinshelwood model at the initial time. On the concentrations range where the model hypotheses are verified, adsorption constants K and kinetics constants k are calculated for experiments under both dry and humid atmosphere. When the relative humidity is increased, the evolution of these constants shows that water vapor acts differently depending on the form of deposited TiO2(powder and film).