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[求助] 积碳的催化剂热重

实验室积碳了的催化剂做了热重,室温到700,10°/min,空气氛围
所做图为:200℃内有失重(归结为水或者吸附的物质),200-400℃衡重,400-500℃失重(认为积碳烧掉),但500℃往后直到700,重量在上升?实在无法理解啊,求各位指点
PS:催化剂为硅胶在的金属氧化物,VPO系列,我就按照V全部为4+计算,即使被O2完全氧化至最高价5+,那增加的重量也没有TG做出来的值大(比如理论计算全部被氧化需要1gO2,但实际催化剂增重5g)
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