Nature has served as a source of inspiration for chemists to design the catalysts with superior performance via mimicking their characteristics,such as active sites,reaction microenvironment and electron transfer beha...Nature has served as a source of inspiration for chemists to design the catalysts with superior performance via mimicking their characteristics,such as active sites,reaction microenvironment and electron transfer behaviors.Over a few decades,many different types of materials have been widely used to construct the biomimetic catalysts.Among these materials,the porous materials have been demonstrated to be powerful platforms for constructing the biomimetic catalysts owing to their high surface area,controllable composition and easy functionalization.In this review,we briefly showed recent advances in the construction of various biomimetic porous catalysts using porous materials for the design of excellent catalysts.In addition,we also present the challenge and opportunities in this emerging field.展开更多
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
Porous polymer supported palladium catalyst for cross coupling reactions with high activity has been successfully prepared by coordination of Pd 2+ species with Schiff bases functionalized porous polymer. The catalyst...Porous polymer supported palladium catalyst for cross coupling reactions with high activity has been successfully prepared by coordination of Pd 2+ species with Schiff bases functionalized porous polymer. The catalyst has been systemically investi-gated by a series of characterizations such as TEM, N 2 adsorption, NMR, IR, XPS, etc. TEM and N 2 isotherms show that the sample maintains the nanoporous structure after the modification and coordination. XPS results show that chemical state of palladium species in the catalyst is mainly +2. More importantly, the catalyst shows very high activities and excellent recycla-bility in a series of coupling reactions including Suzuki, Sonogashira, and Heck reactions. Hot filtration and poison of catalysts experiments have also been performed and the results indicate that soluble active species (mainly Pd(0) species) in-situ gener-ated from the catalyst under the reaction conditions are the active intermediates, which would redeposit to the supporter after the reactions.展开更多
Volatile organic compounds(VOCs)have become one of the most serious threats to human health and eco-environment due to their volatility,toxicity and diffusivity,etc.Catalytic completely oxidation had been regarded as ...Volatile organic compounds(VOCs)have become one of the most serious threats to human health and eco-environment due to their volatility,toxicity and diffusivity,etc.Catalytic completely oxidation had been regarded as a highly efficient strategy for the VOCs abatement.Metal or metal oxides supported on zeolite have been considered as superior catalysts for the treatment of VOCs.Among them,Beta zeolites have attracted many attentions due to their unique structure and consequently catalytic properties in the oxidation of VOCs.The progresses and developments made in the understanding and design of Beta zeolites-based catalysts in the completely oxidation of VOCs in the past two decades have been systematically summarized in this review.展开更多
基金supported by the National Natural Science Foundation of China (Nos.21720102001,U21B20101,22125204,U20B6004,91945302,and 21932006).
文摘Nature has served as a source of inspiration for chemists to design the catalysts with superior performance via mimicking their characteristics,such as active sites,reaction microenvironment and electron transfer behaviors.Over a few decades,many different types of materials have been widely used to construct the biomimetic catalysts.Among these materials,the porous materials have been demonstrated to be powerful platforms for constructing the biomimetic catalysts owing to their high surface area,controllable composition and easy functionalization.In this review,we briefly showed recent advances in the construction of various biomimetic porous catalysts using porous materials for the design of excellent catalysts.In addition,we also present the challenge and opportunities in this emerging field.
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 (20973079 & 21003107)State Basic Research Project of China(2009CB623507)Fundamental Research Funds for the Central Universities (2010QNA3035)
文摘Porous polymer supported palladium catalyst for cross coupling reactions with high activity has been successfully prepared by coordination of Pd 2+ species with Schiff bases functionalized porous polymer. The catalyst has been systemically investi-gated by a series of characterizations such as TEM, N 2 adsorption, NMR, IR, XPS, etc. TEM and N 2 isotherms show that the sample maintains the nanoporous structure after the modification and coordination. XPS results show that chemical state of palladium species in the catalyst is mainly +2. More importantly, the catalyst shows very high activities and excellent recycla-bility in a series of coupling reactions including Suzuki, Sonogashira, and Heck reactions. Hot filtration and poison of catalysts experiments have also been performed and the results indicate that soluble active species (mainly Pd(0) species) in-situ gener-ated from the catalyst under the reaction conditions are the active intermediates, which would redeposit to the supporter after the reactions.
基金This work was supported by the National Natural Science Foundation of China(Nos.22125204,U20B6004).
文摘Volatile organic compounds(VOCs)have become one of the most serious threats to human health and eco-environment due to their volatility,toxicity and diffusivity,etc.Catalytic completely oxidation had been regarded as a highly efficient strategy for the VOCs abatement.Metal or metal oxides supported on zeolite have been considered as superior catalysts for the treatment of VOCs.Among them,Beta zeolites have attracted many attentions due to their unique structure and consequently catalytic properties in the oxidation of VOCs.The progresses and developments made in the understanding and design of Beta zeolites-based catalysts in the completely oxidation of VOCs in the past two decades have been systematically summarized in this review.
