Core-shell structured ZSM-5@Silicalite-1 zeolite could effectively hinder the deactivation of catalyst surface. Currently, organic structure directing agents(OSDAs) are necessary in the conventional route for the synt...Core-shell structured ZSM-5@Silicalite-1 zeolite could effectively hinder the deactivation of catalyst surface. Currently, organic structure directing agents(OSDAs) are necessary in the conventional route for the synthesis of this core-shell zeolite under hydrothermal conditions, which is costly and environmental-unfriendly. In this research, a synthesis of the core-shell structured ZSM-5@Silicalite-1 zeolite with a strategy of alcohol filling and zeolite seeding without any organic template or solvent is exhibited. The obtained products are well characterized by X-ray powder diffractometer(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), N2 sorption isotherms, solid magic angle spinning(MAS) NMR, temperature-programmed-desorption of ammonia(NH3-TPD), and X-ray photoelectron spectroscopy(XPS) techniques, in order to confirm the core-shell structure. More importantly, the core-shell structured ZSM-5@Silicalite-1 zeolite exhibits a long lifetime and a high p-xylene selectivity in the alkylation of toluene with methanol, compared with the conventional ZSM-5 catalyst.展开更多
With the rapid development of industrialization,it is inevitable to produce solid wastes in the fields of energy petrochemical industry.However,the storage and utilization of these solid wastes have become a considera...With the rapid development of industrialization,it is inevitable to produce solid wastes in the fields of energy petrochemical industry.However,the storage and utilization of these solid wastes have become a considerable challenge.Due to the main element composition of these solid wastes including silicon and aluminum,it has attracted extensive attention for synthesizing zeolites.This review summarized the properties of major solid wastes including coal fly ash,coal gangue,spent fluid catalytic cracking(FCC)catalyst,lithium slag,bauxite residue,and waste glass.Then,the preparation of LTA,FAU,ZSM-5,SSZ-13,Beta,and MOR zeolites from these solid wastes were introduced.Finally,the current challenges and perspectives were discussed.展开更多
基金This work was supported by the National Key Research and Development Program of China(No.2017YFB0702803)the Fundamental Research Funds for the Central Universities,China(No.2021QNA4028)the National Natural Science Foundation of China(Nos.21802121,2217020097,21720102001).
文摘Core-shell structured ZSM-5@Silicalite-1 zeolite could effectively hinder the deactivation of catalyst surface. Currently, organic structure directing agents(OSDAs) are necessary in the conventional route for the synthesis of this core-shell zeolite under hydrothermal conditions, which is costly and environmental-unfriendly. In this research, a synthesis of the core-shell structured ZSM-5@Silicalite-1 zeolite with a strategy of alcohol filling and zeolite seeding without any organic template or solvent is exhibited. The obtained products are well characterized by X-ray powder diffractometer(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), N2 sorption isotherms, solid magic angle spinning(MAS) NMR, temperature-programmed-desorption of ammonia(NH3-TPD), and X-ray photoelectron spectroscopy(XPS) techniques, in order to confirm the core-shell structure. More importantly, the core-shell structured ZSM-5@Silicalite-1 zeolite exhibits a long lifetime and a high p-xylene selectivity in the alkylation of toluene with methanol, compared with the conventional ZSM-5 catalyst.
基金supported by the National Natural Science Foundation of China(Nos.22288101,U21B20101,22172141)the Zhejiang Provincial Natural Science Foundation,China(No.LR24B030001).
文摘With the rapid development of industrialization,it is inevitable to produce solid wastes in the fields of energy petrochemical industry.However,the storage and utilization of these solid wastes have become a considerable challenge.Due to the main element composition of these solid wastes including silicon and aluminum,it has attracted extensive attention for synthesizing zeolites.This review summarized the properties of major solid wastes including coal fly ash,coal gangue,spent fluid catalytic cracking(FCC)catalyst,lithium slag,bauxite residue,and waste glass.Then,the preparation of LTA,FAU,ZSM-5,SSZ-13,Beta,and MOR zeolites from these solid wastes were introduced.Finally,the current challenges and perspectives were discussed.
