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以硝酸铈,硫酸钛为前驱体,用氨水共沉淀法制备了一系列CexTi1-xO2催化剂.利用XRD、Raman、N2吸附-脱附、H2-TPR对催化剂进行了表征并考察了其催化HCl氧化制Cl2的性能.结果表明:复合氧化物较CeO2和TiO2更加分散甚至高度弥散,大大增加了其比表面积,最高可达170.5 m2·g-1,同时CeO2与TiO2之间的相互作用显著提高了其可还原氧物种数目,改善了其氧化还原性能.催化反应结果表明,复合氧化物的活性较CeO2和TiO2显著提升,Ce0.1Ti0.9O2表现出了良好的氯化氢催化氧化能力和较好的催化稳定性,在430℃时氯气产率可以达到0.90 gCl2·gcat-1·h-1,反应60 h后,氯气产率稳定在0.76 gCl2·gcat-1·h-1.
A series of CexTi1-xO2 catalysts were prepared by coprecipitation with aqueous ammonia using cerium nitrate and titanium sulfate as precursors. The catalysts were characterized by XRD, Raman, N2 adsorption-desorption and H2-TPR. The results showed that the composite oxides were more dispersed and even dispersed than CeO2 and TiO2, and their specific surface area was greatly increased up to 170.5 m2 · g-1. At the same time, the interaction between CeO2 and TiO2 significantly increased Which can reduce the number of oxygen species to improve its redox performance catalytic reaction results show that the activity of composite oxide significantly higher than CeO2 and TiO2, Ce0.1Ti0.9O2 showed good hydrogen chloride catalytic oxidation and better catalytic The chlorine yield can reach 0.90 gCl2 · gcat-1 · h-1 at 430 ℃. After 60 h reaction, the chlorine yield is stable at 0.76 gCl2 · gcat-1 · h-1.