以比表面积相近的锐钛和金红石TiO₂为载体，制备了负载钒氧和硫酸根物种的催化剂，比较了催化甲醇选择氧化的性能。结果表明，与金红石负载的催化剂相比，锐钛负载的钒氧催化剂具有较好的氧化性和酸性，在反应温度为433 K时，甲醇氧化的转化率较为接近，但产物中甲醛和甲酸甲酯的总选择性为63%，高于金红石负载催化剂上的54%。硫酸根的引入增加了甲醇转化率和甲缩醛选择性，在金红石负载型催化剂上尤为明显，甲缩醛选择性提高至88%。

Using separately anatase and rutile TiO₂ with similar specific surface areas as supporter,the catalysts supported vanadia and sulfate species are prepared.Their catalytic behaviors for the selective oxidation of methanol are evaluated and compared.It is found that anatase TiO₂ supported vanadia catalyst exhibits superior redox and acidity properties than rutile TiO₂ supported catalyst.Although these un-doped sulfate catalysts supported by two supporters exhibit a similar conversion of methanol oxidation at 433 K,total selectivity of formaldehyde and methyl formate for the anatase TiO₂ based catalyst can reach 63%,higher than the 54% selectivity for rutile TiO₂ based catalyst.Addition of sulfate further enhances the conversion of methanol and the selectivity to dimethoxymethane,which is more significant over rutile TiO₂ based catalyst that can improve the selectivity of dimethoxymethane to as high as 88%.

刘经伟(1978-),男,博士,高级工程师,研究方向为多相催化,liujingw.yzsh@sinopec.com。