A5035992114- Zeolite Catalysis and Synthesis
- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Mesoporous Materials and Catalysis
- Photorefractive and Nonlinear Optics
- Solid State Laser Technologies
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced Fiber Laser Technologies
- Advanced NMR Techniques and Applications
- Catalysis and Hydrodesulfurization Studies
- Advanced Chemical Physics Studies
- Chemical Synthesis and Characterization
- Thermal and Kinetic Analysis
- Photonic and Optical Devices
- Phase Equilibria and Thermodynamics
- Anodic Oxide Films and Nanostructures
- Chemical Synthesis and Reactions
- Advanced Physical and Chemical Molecular Interactions
- Thermal Radiation and Cooling Technologies
- Building Energy and Comfort Optimization
- Chemical and Physical Properties in Aqueous Solutions
- Plasmonic and Surface Plasmon Research
- Luminescence Properties of Advanced Materials
- Inorganic and Organometallic Chemistry
- Nanomaterials for catalytic reactions
Nanjing Medical University
2025
Huizhou University
2025
Dalian Institute of Chemical Physics
2015-2024
Chinese Academy of Sciences
2015-2024
Collaborative Innovation Center of Chemistry for Energy Materials
2015-2023
Dalian National Laboratory for Clean Energy
2015-2023
Technical University of Munich
2015-2016
State Key Laboratory of Crystal Materials
2008-2012
Shandong University
2008-2012
Heats of adsorption methane, ethane, and propane in H-chabazite (Si/Al = 14.4) have been measured entropies derived from isotherms. For these systems quantum chemical ab initio calculations Gibbs free energies performed. The deviations the experimental values for are below 3 kJ/mol enthalpy, energy. A hybrid high-level (MP2/CBS): low-level (DFT+dispersion) method is used to determine structures energies. Vibrational thermal enthalpy contributions obtained vibrational partition functions...
The Brønsted acid-catalyzed gas-phase dehydration of 1-propanol (0.075–4 kPa) was studied on zeolite H-MFI (Si/Al = 26, containing minimal amounts extra framework Al moieties) in the absence and presence co-fed water (0–2.5 at 413–443 K. It is shown that propene can be formed from monomeric dimeric adsorbed 1-propanol. stronger adsorption relative to indicates reduced rates are not a consequence competitive between water. Instead, deleterious effect related different extents stabilization...
The conversion of methanol into aromatics over unmodified H-ZSM-5 zeolite is generally not high because the hydrogen transfer reaction results in alkane formation. Now circa 80 % selectivity for coupling and carbon monoxide reported. Carbonyl compounds methyl-2-cyclopenten-1-ones (MCPOs), which were detected products catalysts, respectively, are considered as intermediates. latter species can be synthesized from former olefins. 13 C isotope tracing liquid-state NMR confirmed that atoms CO...
Abstract Extension and clustering of polycyclic aromatic hydrocarbons (PAHs) are key mechanistic steps for coking deactivation in catalysis reactions. However, no unambiguous picture exists on molecule-resolved PAHs speciation evolution, due to the immense experimental challenges deciphering complex structures. Herein, we report an effective strategy through integrating a high resolution MALDI FT-ICR mass spectrometry with isotope labeling technique. With this strategy, complete route...
To account for thermal and entropic effects caused by the dynamics of motion reaction intermediates, ethanol adsorption on Brønsted acid site H-ZSM-5 catalyst has been studied at different temperatures loadings using ab initio molecular (AIMD) simulations, infrared (IR) spectroscopy, calorimetric measurements. At low (T ≤ 400 K) loading, a single molecule adsorbed in forms Zundel-like structure where proton is equally shared between oxygen zeolite alcohol. higher second helps to stabilize...
The industrially important methanol-to-hydrocarbons (MTH) reaction is driven and sustained by autocatalysis in a dynamic complex manner. Hitherto, the entire molecular routes chemical nature of autocatalytic network have not been well understood. Herein, with multitechnique approach multiscale analysis, we obtained full theoretical picture domino cascade taking place on HZSM-5 zeolite. demonstrated to be plausibly initiated reacting dimethyl ether (DME) surface methoxy species (SMS) generate...
Starting from C1 raw material, methanol conversion to hydrocarbons has been realized via a rather complicated pathway. In this contribution, we proposed an alternative reaction route and provided general understanding of such complex indirect mechanism. The methylcyclopentenyl cations their deprotonated counterparts (methylcyclopentadienes) were validated appear on the working H-SAPO-34 catalyst by in situ 13C MAS NMR spectroscopy GC-MS technique, catalytic reactivity was revealed...
Methanol to olefins (MTO) reaction over H-RUB-50 zeolite, an eight-membered ring (8-MR) and cavity-type presents higher selectivity for ethene. The host–guest interaction was dissected used explain the cavity-controlled route product selectivity. By aid of in situ 13C MAS NMR spectroscopy, GC-MS, 12C/13C-methanol switch experiments, theoretical calculations, methylbenzenium cations, methylcyclopentenyl cations (triMB+, tetraMB+, triMCP+), their deprotonated forms with less methyl groups...
Establishing a comprehensive understanding of the dynamical multiscale diffusion and reaction process is crucial for zeolite shape-selective catalysis urgently demanded in academia industry. So far, methanol dimethyl ether (DME) conversions have usually been studied separately focused on single scale. Herein, we decipher molecular DME within material evolving with time, at multiple scales, from scale molecules to catalyst crystal ensemble. Microscopic intracrystalline diffusivity...
Abstract Part of tetrahedral framework aluminum in a protonic mordenite (HMOR) will convert geometry to distorted and octahedral coordination. High‐field 27 Al NMR data show that more atoms at T 3 4 sites change nonframework structures than others. These species preferentially reside the side pockets, which decrease accessibility acid 8‐membered ring (MR) channel, impairing dimethyl ether (DME) carbonylation reaction. The arisen octahedrally coordinated are framework‐associated, can be...
Due to their high breakdown threshold and acceleration gradient, dielectric laser accelerators (DLAs) have become an important technical direction of accelerator miniaturization. In this study, electron scheme based on graphene surface plasmon polaritons (SPPs) is proposed. The grating was designed be etched the silica in simulation, a layer modeled cover medium. incident light simulation configured coupled by generate surface. According results, relatively large channel aperture long length...
The methanol-to-olefins (MTO) reaction over the SAPO-34 catalyst suffers rapid deactivation due to coke deposition. Here, partial regeneration methods with air combustion and steam gasification were investigated. results showed that both could not only reactivate spent but also prompt ethylene selectivity. Whereas, was more effective , by which initial selectivity reach 53%, much higher than of 23% fresh catalyst. Several characterizations, e.g., Fourier transform infrared spectroscopy gas...
In this paper, the crystal growth and characterization of Nd:Gd3AlxGa5-xO12 (x = 0.94) (Nd:GGAG) was reported. The X-ray powder diffraction studies confirm that is isostructural with Gd3Ga5O12 (GGG) unit cell parameter 1.2319 nm. absorption emission spectra Nd:GGAG at room temperature have been studied. With a laser-diode (LD) as pump source, continuous-wave (CW) laser performance 1.06 μm Nd:GAGG demonstrated for first time to our knowledge. maximum power 2.44 W from obtained optical...
Abstract The conversion of methanol into aromatics over unmodified H‐ZSM‐5 zeolite is generally not high because the hydrogen transfer reaction results in alkane formation. Now circa 80 % selectivity for coupling and carbon monoxide reported. Carbonyl compounds methyl‐2‐cyclopenten‐1‐ones (MCPOs), which were detected products catalysts, respectively, are considered as intermediates. latter species can be synthesized from former olefins. 13 C isotope tracing liquid‐state NMR confirmed that...
Nanosized HZSM-22 has been successfully prepared using ball milling combined with alkaline and acid post-treatment, presented significant enhancement of catalytic stability due to the improvement diffusion effect.
Constructing mesoporous structure within zeolites by alkali-treatment is an effective protocol to improve their diffusion properties. However, undesirable changes in Brönsted acid site (BAS) densities always offset this advantage acid-catalyzed reactions. In context, the crucial roles of spatial aluminum (Al) distribution were unraveled during MFI zeolite and desirable BAS density was achieved obtained hierarchical samples for target Various characterization methods, particularly multiple...
Continuous-wave (CW) and passively Q-switched operations of LD-end-pumped Nd:Gd(3)Al(x)Ga(5-x)O(12) (Nd:GAGG) laser at 1062 nm were reported. The highest CW output power 5.7 W was obtained, corresponding to an optical conversion efficiency slope 51.0% 54.5%, respectively. Nd:GAGG is comparable even better than that Nd:GGG. realized for the first time our knowledge. In addition, a maximum 1.12 W, pulse repetition rate 39 kHz minimum width 6 ns obtained by using Cr(4+):YAG as saturable absorber.
We demonstrated the 1.33 microm laser performance with Nd:Gd(3)Al(x)Ga(5-x)O(12) (x = 0.94) (Nd:GAGG) crystals for first time. Continuous-wave (cw) output power of 2.45 W was obtained optical-optical conversion efficiency 21.8% and slope 23.3%. In passive Q-switching regime, highest power, shortest pulse width, largest energy peak were achieved to be 326 mW 18.2 ns, 36.3 microJ 2.0 kW, respectively, V(3+):YAG crystal as saturable absorber.
Abstract Constructing mesoporous structure within zeolites by alkali‐treatment is an effective protocol to improve their diffusion properties. However, undesirable changes in Brönsted acid site (BAS) densities always offset this advantage acid‐catalyzed reactions. In context, the crucial roles of spatial aluminum (Al) distribution were unraveled during MFI zeolite and desirable BAS density was achieved obtained hierarchical samples for target Various characterization methods, particularly...