碱土金属氧化物对锰系碱土催化剂性能的影响
The Influence of Alkaline-Earth Metal Oxide On the Catalytic Properties of Manganese-Rare Earth Metal Oxides System
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摘要: 本文研究了添加碱土金属氧化物对锰系稀土催化剂性能的影响,实验发明,它可以改善催化剂的热稳定性,其顺序是CaO > SrO > BaO。当BaO的添加量为1.0%时,具有较好的初活性和热稳定性。实验还表明,碱土金属氧化物对催化剂的性能这种影响可能是通过其表面酸碱性而起作用,催化剂表面酸量以0.4毫摩尔/克较为适宜。Abstract: The influence of alkaline-earth metal oxide on the catalytic properties of manganese-rare earth metal oxides system has been studied. When a small amount of alkaline-earth metal oxides is added, the thermostability of the catalyst can be improved. The sequence of thermal resistance is CaO > SrO > BaO. It has been found that initial activity and thermal stability of a catalyst are satisfactory when its BaO content is 1.0%. Test results also show that the influence of alkaline-earth metal oxide on the catalytic properties is probably through the action of its surface acidity or basicity. The appropriate acidity of catalyst is about 0.4mmol/g.