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考察了铜-稀土氧化物催化剂在催化燃烧工业装置中使用时的耐用性。使用两年的数据表明,催化剂性能稳定,对于含甲苯、二甲苯的废气净化率为90～100%。用BET方法、扫描电镜、X-射线衍射仪和X-光电子能谱仪对经不同使用时间后的催化剂进行考察,表明晶相、价态没有改变。使用一年后的比表面积下降32%,但是在规定的宏观动力学条件下,对催化性能没有影响。在更为苛刻的条件下,于实验室装置中研究了催化剂的耐热性,证明可在700℃以下安全作业。考察了抗硫能力,证明可抗30 ppm以下的SO_2;增高反应温度可以进一步提高抗硫能力。
The durability of copper-rare earth oxide catalysts for use in catalytic combustion industrial plants was investigated. Using two years of data shows that the catalyst performance is stable, for toluene, xylene exhaust purification rate of 90 to 100%. The BET method, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy were used to investigate the catalysts after different usage times, indicating that the crystalline phase has no change in valence. After one year of use, the specific surface area decreased by 32%, but under the macroscopic kinetic conditions it had no effect on the catalytic performance. Under more severe conditions, the heat resistance of the catalyst was investigated in a laboratory installation and proved to be safe under 700 ° C. The anti-sulfur ability was examined to prove that it can resist SO 2 below 30 ppm. Increasing the reaction temperature can further improve the anti-sulfur ability.