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用 in situ FTIR法研究了 H2 、CO及 CO/H2 在 Zr O2 表面的吸附行为 .结果表明 ,H2 在 Zr O2 表面吸附存在两种形态的羟基 (即 Zr OH和 Zr OHZr) ,吸附温度增加 ,羟基数量增加 .CO在 2 0 0℃易与 Zr O2 表面羟基作用形成甲酸盐物种 ,吸附温度升高时 ,该物种逐渐分解生成 CO和 Zr OH.当 CO和 H2 共存时 ,表面甲酸盐的量明显增加 ,并随温度增加 ,逐渐加氢形成甲氧基 ,最后生成甲烷 .甲氧基的加氢过程较慢 ,所需反应温度也较高 ,被认为是 CO加氢合成醇的速控步骤 .
The in situ FTIR method was used to study the adsorption behavior of H2, CO and CO / H2 on the surface of ZrO2. The results show that there are two kinds of hydroxyl groups (ie, ZrOH and ZrOHZr) adsorbed on the surface of ZrO2, The number of hydroxyl groups increases.CO readily forms a formate species on the surface of ZrO2 surface at 200 ℃ and the species gradually decompose to form CO and ZrOH when the adsorption temperature is increased.When CO and H2 coexist, the surface formate With the increase of temperature, and gradually hydrogenation to form methoxy, and finally generate methane. Methoxy hydrogenation process is slower, the reaction temperature is also higher, is considered to CO hydrogenation of alcohol synthesis speed Control steps.