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用程序升温脱附技术,研究了添加稀土的烃类水蒸汽重整催化剂(Ni/α-Al_2O_3)对水蒸汽的吸附性能,同未加稀土的镍催化剂作了对比。结果表明,加有稀土的镍催化剂对水蒸汽的吸附能力主要是稀土的贡献。还原态催化剂对水蒸汽的吸附量比相应的氧化态多1.4倍。发现催化剂对水蒸汽的吸附能力不仅取决于浸渍方式,而且同稀土含量有关。当稀土含量较多时,催化剂表面上呈现出三个能量不同的吸附位。稀土含量少于1.3%时。对提高催化剂吸附水蒸汽的能力已作用不大。含稀土的镍催化剂吸附水蒸汽的能力大,正是其抗结炭性能耐硫性能好的原因。
The temperature-programmed desorption technique was used to study the adsorption of steam on the steam reforming catalyst (Ni / α-Al_2O_3) with rare earth added hydrocarbon steam reforming catalyst, which was compared with the nickel catalyst without addition of rare earth. The results show that the rare earth nickel catalyst plus adsorption of water vapor is mainly the contribution of rare earth. Reduced state catalyst adsorption of water vapor 1.4 times more than the corresponding oxidation state. It is found that the adsorption capacity of the catalyst on water vapor depends not only on the impregnation method but also on the content of rare earth. When the content of rare earth is high, three adsorption sites with different energies appear on the catalyst surface. Rare earth content of less than 1.3%. To improve the ability of the catalyst to adsorb water vapor has played little role. Rare earth nickel catalyst adsorption capacity of water vapor, it is the anti-carbon properties of sulfur-tolerant good reason.