利用密度泛函理论研究了HCHO分子在TiO2金红石(110)面和锐钛矿(101)面上的吸附,结果表明甲醛在这些面上均能形成稳定的化学吸附与物理吸附.在物理吸附中,分子构型受吸附的影响均十分微弱.而在化学吸附中,甲醛分子明显变形,甲醛分子与表面的2配位O原子(O2C)一起形成双氧甲基(CH2O2)物种.化学吸附导致HCHO分子中的羰基延长14％～17％,表明吸附削弱了分子内原子之间的作用,从而有利于分解.此外,在这两种表面中,金红石(110)面对HCHO较强的吸附显示了其活性比锐钛矿(101)面高.
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