|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Optimizing zeolite stabilized Pt-Zn catalysts for propane dehydrogenation显示文摘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. | Linjun Xie Yuchao Chai Lanlan Sun Weili Dai Guangjun Wu Naijia Guan Landong Li | 2021 | Journal of Energy Chemistry2021，30，6： | 5 |
| 2 | Propane dehydrogenation catalyzed by in-situ partially reduced zinc cations confined in zeolites显示文摘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. | Linjun Xie Rui Wang Yuchao Chai Xuefei Weng Naijia Guan Landong Li | 2021 | Journal of Energy Chemistry2021，30，12： | 4 |
| 3 | An Efficient Photocatalyst: Anodized TiO 2 Nanotube Arrays Codoped with Gd–La显示文摘 | Xiaoqiu Zhang Yuchao Chai Lin Lin Ke Zhang Bin Zhao Dannong He | 2014 | Catalysis Letters2014，，6： | 1 |
| 4 | Acetylproteomics analyses reveal critical features of lysine-ε-acetylation in Arabidopsis and a role of 14-3-3 protein acetylation in alkaline response显示文摘Lysine-ε-acetylation(Kac)is a post-translational modification(PTM)that is critical for metabolic regulation and cell signaling in mammals.However,its prevalence and importance in plants remain to be determined.Employing high-resolution tandem mass spectrometry,we analyzed protein lysine acetylation in five representative Arabidopsis organs with 2~3 biological replicates per organ.A total of 2887 Kac proteins and 5929 Kac sites were identified.This comprehensive catalog allows us to analyze proteome-wide features of lysine acetylation.We found that Kac proteins tend to be more uniformly expressed in different organs,and the acetylation status exhibits little correlation with the gene expression level,indicating that acetylation is unlikely caused by stochastic processes.Kac preferentially targets evolutionarily conserved proteins and lysine residues,but only a small percentage of Kac proteins are orthologous between rat and Arabidopsis.A large portion of Kac proteins overlap with proteins modified by other PTMs including ubiquitination,SUMOylation and phosphorylation.Although acetylation,ubiquitination and SUMOylation all modify lysine residues,our analyses show that they rarely target the same sites.In addition,we found that“reader”proteins for acetylation and phosphorylation,i.e.,bromodomain-containing proteins and GRF(General Regulatory Factor)/14-3-3 proteins,are intensively modified by the two PTMs,suggesting that they are main crosstalk nodes between acetylation and phosphorylation signaling.Analyses of GRF6/14-3-3λreveal that the Kac level of GRF6 is decreased under alkaline stress,suggesting that acetylation represses plant alkaline response.Indeed,K56ac of GRF6 inhibits its binding to and subsequent activation of the plasma membrane H+-ATPase AHA2,leading to hypersensitivity to alkaline stress.These results provide valuable resources for protein acetylation studies in plants and reveal that protein acetylation suppresses phosphorylation output by acetylating GRF/14-3-3 proteins. | Jianfei Guo Xiaoqiang Chai Yuchao Mei Jiamu Du Haining Du Huazhong Shi Jian-Kang Zhu Heng Zhang | 2022 | Stress Biology2022，2，1： | 1 |
| 5 | Homogeneous-like Alkyne Selective Hydrogenation Catalyzed by Cationic Nickel Confined in Zeolite显示文摘The selective hydrogenation of alkynes to their corresponding alkenes is an important type of organic transformation,which is currently accomplished by modified palladium catalysts.Herein,we report that coordinatively unsaturated Ni(II)sites confined in faujasite zeolite,that is,Ni@Y,can efficiently catalyze the selective hydrogenation of various alkynes in both gas-and liquid phase.Spectroscopic and kinetic analyses explicitly reveal that alkyne hydrogenation over Ni@Y follows the homogeneous associative mechanism instead of the classic heterogeneous Horiuti–Polanyi mechanism.Density functional theory calculations confirm that the preferential adsorption of alkynes on coordinatively unsaturated Ni(II)sites is crucial to initiate dihydrogen activation for the subsequent hydrogenation.Ni@Y represents a true heterogeneous catalyst acting as a homogeneous catalyst and shares the advantages of both heterogeneous and homogeneous catalysis.These findings may shed light on the rational design of robust catalysts and new catalytic routes by linking heterogeneous and homogeneous catalysis. | Xin Deng Ruihao Bai Yuchao Chai Zhenpeng Hu Naijia Guan Landong Li | 2022 | CCS Chemistry2022，4，3： | 1 |
| 6 | Zeolite-encaged mononuclear copper centers catalyze CO_(2)selective hydrogenation to methanol显示文摘The selective hydrogenation of CO_(2) to methanol by renewable hydrogen source represents an attractive route for CO_(2) recycling and is carbon neutral.Stable catalysts with high activity and methanol selectivity are being vigorously pursued,and current debates on the active site and reaction pathway need to be clarified.Here,we report a design of faujasite-encaged mononuclear Cu centers,namely Cu@FAU,for this challenging reaction.Stable methanol space-time-yield(STY)of 12.8 mmol g_(cat)^(-1)h^(-1)and methanol selectivity of 89.5%are simultaneously achieved at a relatively low reaction temperature of 513 K,making Cu@FAU a potential methanol synthesis catalyst from CO_(2) hydrogenation.With zeolite-encaged mononuclear Cu centers as the destined active sites,the unique reaction pathway of stepwise CO_(2)hydrogenation over Cu@FAU is illustrated.This work provides a clear example of catalytic reaction with explicit structure-activity relationship and highlights the power of zeolite catalysis in complex chemical transformations. | Yuchao Chai Bin Qin Bonan Li Weili Dai Guangjun Wu Naijia Guan Landong Li | 2023 | National Science Review2023，10，7： | 0 |
| 7 | Efficient Heterogeneous Hydroformylation over Zeolite-Encaged Isolated Rhodium Ions显示文摘Alkene hydroformylation is an extremely important industry process currently accomplished via homogeneous catalysis.Heterogeneous hydroformylation is being avidly pursued as a more economical and sustainable process.Herein,we report the construction of zeolite-encaged rhodium catalyst for efficient hydroformylation.Through a facile in situ hydrothermal strategy,isolated Rh^(δ+)(δ=2.5)can be encaged in faujasite and efficiently stabilized via interaction with framework oxygen atoms,producing a Rh@Y model catalyst with well-defined rhodium sites and coordination environment.Rh@Y exhibits high catalytic activity,perfect chemoselectivity,and recyclability in 1-hexene hydroformylation under mild reaction conditions,making it a robust heterogeneous catalyst for potential applications.A state-of-the-art turnover frequency value of 6567 molC=C/molRh/h for Rh@Y can be achieved in 1-hexene hydroformylation at 393 K,outperforming all heterogeneous catalysts and most homogeneous catalysts under comparable conditions.With the well-defined structure of Rh@Y,the detailed mechanism of alkene hydroformylation can be interpreted via theoretical calculations,and the advantages of heterogeneous hydroformylation are well explained.This work provides a promising solution toward efficient heterogeneous noble metal catalysis by encaging stable isolated ions in a zeolite matrix. | Weixiang Shang Bin Qin Mingyang Gao Xuetao Qin Yuchao Chai Guangjun Wu Naijia Guan Ding Ma Landong Li | 2023 | CCS Chemistry2023，5，7： | 0 |
| 8 | Cascade adsorptive separation of light hydrocarbons by commercial zeolites显示文摘Adsorptive separation of light hydrocarbons by porous solids provides an energy-efficient alternative to state-of-the-art cryogenic distillation.However,an optimal balance between the cost,performance and stability of the sorbent material is yet to be achieved for industrial applications.Here,we report the efficient separation of C2 and C3 hydrocarbons by a faujasite zeolite(Na-X,Si/Al=1.23).A tandem configuration of two fixed-beds packed with Na-X affords complete dynamic separation of the ternary mixture of C_(2)H_(2)/C_(2)H_(4)/C_(2)H_(6)(1/49.5/49.5;v/v/v)under ambient conditions.Pressure-swing desorption on the latter fixed-bed gives ethylene(>99.50%,1.80 mmol g^(-1))and ethane(>99.99%,1.41 mmol g^(-1)).In situ synchrotron X-ray powder diffraction revealed the binding sites for C_(2)H_(2)and C_(2)H_(4)in Na-X.This study highlights the potential application of commercial zeolites for challenging industrial separations. | Shanshan Liu Yinlin Chen Bin Yue Yuanxin Nie Yuchao Chai Guangjun Wu Jiangnan Li Xue Han Sarah JDay Stephen PThompson Naijia Guan Sihai Yang Landong Li | 2022 | Journal of Energy Chemistry2022，31，9： | 0 |
| 9 | Zeolites for separation:Fundamental and application显示文摘Material based emerging separation techniques are attracting more and more attention as alternatives to the traditional ones such as distillation and extraction,aiming to reduce energy consumption and pollutant emissions.Due to their structure characteristics,zeolites can act as versatile sieves and adsorbents for molecules and have been successfully applied in some very important separation processes.Herein,two major catalogues of zeolite separations,namely membrane separation and adsorptive separation,are discussed and their underlying mechanisms are focused.In the part of membrane separation,the synthesis strategies toward zeolite membranes are introduced and the uniformly-oriented zeolite membranes are emphasized.In the part of the adsorptive separation,the industrial and popular adsorptive separations with the corresponding zeolite adsorbents are summarized.Generally,membrane separation relies on the molecular diffusion behavior within zeolites while adsorptive separation relies on the guest–host interaction in principle.The key challenges and misconceptions in zeolite separations are highlighted throughout the article. | Bin Yue Shanshan Liu Yuchao Chai Guangjun Wu Naijia Guan Landong Li | 2022 | Journal of Energy Chemistry2022，31，8： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员