Photocatalytic hydrogen production is one of the most promising ways to obtain sustainable hydrogen energy.However,it is constrained by low energy conversion efficiency,which is due to the fast recombination of photog...Photocatalytic hydrogen production is one of the most promising ways to obtain sustainable hydrogen energy.However,it is constrained by low energy conversion efficiency,which is due to the fast recombination of photogenerated electrons and holes,the low utilization rate of the visible light of the solar spectrum,and the severe photo corrosion of semiconductor photocatalyst.The construction of semiconductor heterojunction is not only beneficial to the separation of photo generated carriers in photocatalysts,but also effective to broaden the range of light harvest by introducing narrow bandgap semiconductors.In this paper,a heterojunction photocatalyst ZnO/CeVO_(4) was obtained by simple mild physical method.The Z-scheme heterostructure of ZnO/CeVO_(4) is conducive to the strong electron interaction,the enlarged light trapping range,the promoted separation and migration of photo carriers,and the high redox properties.Compared with the pure ZnO and CeVO_(4) catalysts,the photocatalytic efficiency of ZnO/CeVO_(4) is higher,and the optimal hydrogen production rate reaches 1289μmol/(g·h).This work affords a simple mild method to construct a Z-scheme CeVO_(4) based photocatalysts,which show high active photocatalytic H_(2)production performance.展开更多
Propane dehydrogenation(PDH)provides an alternative route to non-petroleum based propylene and eligible catalysts with good overall performance are still being explored.Herein,we report the construction of zeolite sta...Propane dehydrogenation(PDH)provides an alternative route to non-petroleum based propylene and eligible catalysts with good overall performance are still being explored.Herein,we report the construction of zeolite stabilized Pt-Zn catalysts Pt-Zn/Si-Beta for PDH.Characterization results from transmission electron microscopy(TEM),ultraviolet-visible(UV-vis)and Fourier transform infrared(FTIR)spectroscopy reveal that highly-dispersed Zn species are stabilized by the silanols from zeolite framework dealumination,which then act as the anchoring sites for Pt species.The close contact between Pt-Zn species and the electronic interaction thereof make Pt-Zn/Si-Beta robust PDH catalysts.Under optimized conditions,a high propylene production rate of 4.11 molmol_(Pt)^(-1)s^(-1),high propylene selectivity of 98% and a sustainable deactivation rate of~0.02 h^(-1)can be simultaneously achieved at 823 K.Coke deposition is not the key reason for the catalytic deactivation,while the loss of Zn species and the resulting aggregation of Pt species under high temperatures are responsible for the irreversible deactivation of Pt-Zn/Si-Beta catalyst in PDH reaction.展开更多
Propane dehydrogenation(PDH), employing Pt-or Cr-based catalysts, represents an emerging industrial route for propylene production. Due to the scarcity of platinum and the toxicity of chromium, alternative PDH catalys...Propane dehydrogenation(PDH), employing Pt-or Cr-based catalysts, represents an emerging industrial route for propylene production. Due to the scarcity of platinum and the toxicity of chromium, alternative PDH catalysts are being pursued. Herein, we report the construction of Zn-containing zeolite catalysts,namely Zn@S-1, for PDH reaction. Well-isolated zinc cations are successfully trapped and stabilized by the Si-OH groups in S-1 zeolites via in-situ hydrothermal synthesis. The as-prepared Zn@S-1 catalysts exhibit good dehydrogenation activity, high propylene selectivity, and regeneration capability in PDH reaction under employed conditions. The in-situ partial reduction of zinc species is observed and the partially reduced zinc cations are definitely identified as the active sites for PDH reaction.展开更多
Zeolites with ordered porous structure of molecular size are widely employed as commercial adsorbents and catalysts.On the other hand,the zeolite matrix is regarded as an ideal scaffold for hosting coordinatively unsa...Zeolites with ordered porous structure of molecular size are widely employed as commercial adsorbents and catalysts.On the other hand,the zeolite matrix is regarded as an ideal scaffold for hosting coordinatively unsaturated sites.Remarkable achievements have been made dealing with the construction,characterization and catalytic applications of coordinatively unsaturated sites in zeolite matrix.Herein,a literature overview of recent progresses on this important topic is presented from the specific view of coordination chemistry.Different strategies to construction coordinatively unsaturated sites in zeolite matrix,in zeolite framework or extraframework positions,are first introduced and their characteristics are compared.Then,spectroscopic techniques to determine the existing states of cation sites and their transformations in zeolite matrix are discussed.In the last section,the catalytic applications of coordinatively unsaturated sites in zeolite matrix for various important chemical transformations are summarized.展开更多
To the Editor:Duchenne muscular dystrophy(DMD)is a rare X-linked inherited disorder caused by dystrophin deficiency,which results in sarcolemmal fragility and degeneration of skeletal and cardiac myocytes.[1]Cardiac i...To the Editor:Duchenne muscular dystrophy(DMD)is a rare X-linked inherited disorder caused by dystrophin deficiency,which results in sarcolemmal fragility and degeneration of skeletal and cardiac myocytes.[1]Cardiac involvement ismanifested asDMDcardiomyopathy,which is the leading cause of disease-related morbidity and mortality among DMD patients.展开更多
基金Project supported by the National Natural Science Foundation of China(22275185)the Nature Science Foundation of Fujian Province(2022Y0071)the XMIREM Autonomously Deployment Project(2023CX07,2023GG01)。
文摘Photocatalytic hydrogen production is one of the most promising ways to obtain sustainable hydrogen energy.However,it is constrained by low energy conversion efficiency,which is due to the fast recombination of photogenerated electrons and holes,the low utilization rate of the visible light of the solar spectrum,and the severe photo corrosion of semiconductor photocatalyst.The construction of semiconductor heterojunction is not only beneficial to the separation of photo generated carriers in photocatalysts,but also effective to broaden the range of light harvest by introducing narrow bandgap semiconductors.In this paper,a heterojunction photocatalyst ZnO/CeVO_(4) was obtained by simple mild physical method.The Z-scheme heterostructure of ZnO/CeVO_(4) is conducive to the strong electron interaction,the enlarged light trapping range,the promoted separation and migration of photo carriers,and the high redox properties.Compared with the pure ZnO and CeVO_(4) catalysts,the photocatalytic efficiency of ZnO/CeVO_(4) is higher,and the optimal hydrogen production rate reaches 1289μmol/(g·h).This work affords a simple mild method to construct a Z-scheme CeVO_(4) based photocatalysts,which show high active photocatalytic H_(2)production performance.
基金supported by the Municipal Natural Science Foundation of Tianjin(18JCJQJC47400,18JCZDJC37400)the National Postdoctoral Program for Innovative Talent(BX20200171)the Fundamental Research Funds for the Central Universities。
文摘Propane dehydrogenation(PDH)provides an alternative route to non-petroleum based propylene and eligible catalysts with good overall performance are still being explored.Herein,we report the construction of zeolite stabilized Pt-Zn catalysts Pt-Zn/Si-Beta for PDH.Characterization results from transmission electron microscopy(TEM),ultraviolet-visible(UV-vis)and Fourier transform infrared(FTIR)spectroscopy reveal that highly-dispersed Zn species are stabilized by the silanols from zeolite framework dealumination,which then act as the anchoring sites for Pt species.The close contact between Pt-Zn species and the electronic interaction thereof make Pt-Zn/Si-Beta robust PDH catalysts.Under optimized conditions,a high propylene production rate of 4.11 molmol_(Pt)^(-1)s^(-1),high propylene selectivity of 98% and a sustainable deactivation rate of~0.02 h^(-1)can be simultaneously achieved at 823 K.Coke deposition is not the key reason for the catalytic deactivation,while the loss of Zn species and the resulting aggregation of Pt species under high temperatures are responsible for the irreversible deactivation of Pt-Zn/Si-Beta catalyst in PDH reaction.
基金National Natural Science Fund of China(22025203, 21872072)the Municipal Natural Science Fund of Tianjin (18JCJQJC47400) for supporting the work。
文摘Propane dehydrogenation(PDH), employing Pt-or Cr-based catalysts, represents an emerging industrial route for propylene production. Due to the scarcity of platinum and the toxicity of chromium, alternative PDH catalysts are being pursued. Herein, we report the construction of Zn-containing zeolite catalysts,namely Zn@S-1, for PDH reaction. Well-isolated zinc cations are successfully trapped and stabilized by the Si-OH groups in S-1 zeolites via in-situ hydrothermal synthesis. The as-prepared Zn@S-1 catalysts exhibit good dehydrogenation activity, high propylene selectivity, and regeneration capability in PDH reaction under employed conditions. The in-situ partial reduction of zinc species is observed and the partially reduced zinc cations are definitely identified as the active sites for PDH reaction.
基金supported by the National Natural Science Fundation of China(21722303,21421001)the Municipal Natural Science Fund of Tianjin(18JCJQJC47400,18JCZDJC37400)111 Project(B12015,B18030)~~
文摘Zeolites with ordered porous structure of molecular size are widely employed as commercial adsorbents and catalysts.On the other hand,the zeolite matrix is regarded as an ideal scaffold for hosting coordinatively unsaturated sites.Remarkable achievements have been made dealing with the construction,characterization and catalytic applications of coordinatively unsaturated sites in zeolite matrix.Herein,a literature overview of recent progresses on this important topic is presented from the specific view of coordination chemistry.Different strategies to construction coordinatively unsaturated sites in zeolite matrix,in zeolite framework or extraframework positions,are first introduced and their characteristics are compared.Then,spectroscopic techniques to determine the existing states of cation sites and their transformations in zeolite matrix are discussed.In the last section,the catalytic applications of coordinatively unsaturated sites in zeolite matrix for various important chemical transformations are summarized.
基金Clinical research funding of Chinese society of cardiovascular disease(CSC)of 2019(HFCSC2019B01)National Natural Science Foundation of China(82071874,81971586,81901712,81771887,and 81771897)+1 种基金Sichuan Science and Technology Program(2020YFS0050,2020YJ0029,2017TD0005,21ZDYF1967)Fundamental Research Funds for the Central Universities(SCU2020D4132)
文摘To the Editor:Duchenne muscular dystrophy(DMD)is a rare X-linked inherited disorder caused by dystrophin deficiency,which results in sarcolemmal fragility and degeneration of skeletal and cardiac myocytes.[1]Cardiac involvement ismanifested asDMDcardiomyopathy,which is the leading cause of disease-related morbidity and mortality among DMD patients.
