微波焙烧对纳米Ce_(x)Zr_(1-x)O_(2)固溶体微观结构及其NH_(3)-SCR催化性能的影响

Effect of microwave roasting on the microstructure of Ce_(x)Zr_(1-x)O_(2)nanosolid solution and its NH_(3)-SCR catalytic performance

采用微波加热将通过水热法合成的Ce_(x)Zr_(1-x)O_(2)(0<x≤1)固溶体前驱体在500℃进行焙烧2 h,最终得到不同配比的纳米Ce_(x)Zr_(1-x)O_(2)固溶体粉末状样品.研究不同配比的Ce_(x)Zr_(1-x)O_(2)的结构和微观形貌对其NH_(3)-SCR催化性能的影响.结果表明,利用微波炉合成的Ce_(x)Zr_(1-x)O_(2)固体粉末中,当CeO_(2)中掺入Zr元素形成Ce_(0.4)Zr_(0.6)O_(2)固溶体之后,Ce_(0.4)Zr_(0.6)O_(2)比表面积比CeO_(2)增加了1倍,NH_(3)-SCR最高脱硝活性也由42.4%增加到90.0%.当n Ce∶n Zr=4∶6时,其微观形貌最好,颗粒的分散度较高,同时,其NH_(3)-SCR脱硝活性达到Ce_(x)Zr_(1-x)O_(2)中的最大值90.0%.

The Ce_(x)Zr_(1-x)O_(2)(0<x≤1)solid solution precursors synthesized by hydrothermal method were roasted at 500℃for 2 h using microwave heating,and the powdered nano-Ce_(x)Zr_(1-x)O_(2)solid solution samples with different ratios were obtained.The effects of the structure and microscopic morphology of Ce_(x)Zr_(1-x)O_(2)with different ratios on its NH_(3)-SCR catalytic performance were investigated.The results showed that in the Ce_(x)Zr_(1-x)O_(2)solid powder synthesized using microwave oven,when CeO_(2)was mixed with Zr element to form Ce_(0.4)Zr 0.6 O_(2)solid solution,the specific surface area of Ce_(0.4)Zr 0.6 O_(2)doubled that of CeO_(2),and the highest denitrification activity of NH_(3)-SCR increased from 42.4%to 90.0%.When n Ce∶n Zr=4∶6,its microscopic morphology was the best and the dispersion of particles was higher,while its NH_(3)-SCR denitrification activity reached the maximum value of 90.0%in cerium-zirconium solid solution.