H-Zr-MCM-48的合成及其正庚烷异构性能

通过水热法成功合成了锆掺杂的MCM 48（Zr MCM 48）介孔材料，并用离子交换制得H Zr MCM 48催化剂。采用X射线衍射（XRD）、透射电镜（TEM）、氮气吸附 脱附等测试手段对样品进行表征。结果表明，所合成的Zr MCM 48及H Zr MCM 48仍保持立方有序介孔结构，H Zr MCM 48催化剂的酸性及催化稳定性均有所提高。在正庚烷异构化探针反应中，同等反应条件(锆/硅摩尔比为002、反应温度为260℃、反应时间为130 min)下，与Zr MCM 48相比，H Zr MCM 48对正庚烷异构化反应的催化性能更好，转化率和选择性分别达到446%和945%。相对较高的多支链异庚烷产物比例表明，所合成的H Zr MCM 48催化剂对于烷烃异构化有良好的应用潜力。

Synthesis of H-Zr-MCM-48 and Its application in n-Heptane Isomerization

Zirconium incorporated MCM 48 mesoporous materials were synthesized by hydrothermal method. And the H Zr MCM 48 catalyst was prepared by ion exchanging method. The sample was characterized by various methods including X ray diffraction, transmission electron microscope, N2 adsorption desorption, and catalytically evaluated by n heptane isomerization. These results reveal that the synthesized Zr MCM 48 and H Zr MCM 48 still maintain a cubic ordered mesoporous structure. The acidity and stability of the H Zr MCM 48 catalyst is also enhanced. H Zr MCM 48 exhibits excellent catalytic performance in n heptane isomerization. Under the same reaction conditions, compared with Zr MCM 48, the conversion and the selectivity in H Zr MCM 48 system are 446% and 945%, respectively, with molar ratio of Zr to Si of 002, the reaction temperature of 260℃ and the reaction time of 130 min. The high selectivity of multi branched i heptane products indicates that the synthesized H Zr MCM 48 catalyst has good application potential in alkane isomerization.