A5088666240- Zeolite Catalysis and Synthesis
- Metal-Organic Frameworks: Synthesis and Applications
- Mesoporous Materials and Catalysis
- Advanced NMR Techniques and Applications
- Catalysis and Hydrodesulfurization Studies
- Catalytic Processes in Materials Science
- Catalysis for Biomass Conversion
- Catalysis and Oxidation Reactions
- Chemical Synthesis and Characterization
- Covalent Organic Framework Applications
- Advanced Photocatalysis Techniques
- Chemical Synthesis and Reactions
- X-ray Diffraction in Crystallography
- Nanomaterials for catalytic reactions
- Supercapacitor Materials and Fabrication
- Ammonia Synthesis and Nitrogen Reduction
- Polyoxometalates: Synthesis and Applications
- Asymmetric Hydrogenation and Catalysis
- Crystallization and Solubility Studies
- Electrocatalysts for Energy Conversion
- Boron and Carbon Nanomaterials Research
- Spectroscopy and Quantum Chemical Studies
- Advanced Condensed Matter Physics
- Electron Spin Resonance Studies
- Solid-state spectroscopy and crystallography
Wuhan Institute of Physics and Mathematics
2016-2025
Chinese Academy of Sciences
2016-2025
State Key Laboratory of Magnetism
2014-2024
University of Chinese Academy of Sciences
2016-2023
Institute of Atomic and Molecular Sciences, Academia Sinica
2020
Resonance Research (United States)
2020
University of Central Florida
1995
Isolating and stabilizing boron Oxidative dehydrogenation of propane can produce propene from shale gas help to replace petroleum as a feedstock. Boron-based catalysts have high selectivity propene, but the water by-product deactivate catalyst by hydrolyzing boron. Zhou et al. synthesized boron-doped silicate zeolites containing isolated sites that were stable against hydrolysis. The could achieve one-pass conversions up ∼44% with selectivities for >80% ethene. They observed no...
Although the mass production of synthetic plastics has transformed human lives, it resulted in waste accumulation on earth. Here, we report a low-temperature conversion polyethylene into olefins. By mixing feed with rationally designed ZSM-5 zeolite nanosheets at 280 °C flowing hydrogen as carrier gas, light hydrocarbons (C1-C7) were produced yield up to 74.6%, where 83.9% these products C3-C6 olefins almost undetectable coke formation. The reaction proceeds multiple steps, including...
Hydroformylation is one of the largest industrially homogeneous processes that strongly relies on catalysts with phosphine ligands such as Wilkinson's catalyst (triphenylphosphine coordinated Rh). Heterogeneous for olefin hydroformylation are highly desired but suffer from poor activity compared catalysts. Herein, we demonstrate rhodium nanoparticles supported siliceous MFI zeolite abundant silanol nests very active hydroformylation, giving a turnover frequency high ~50,000 h-1 even...
Abstract The introduction of enlarged and interconnected nanochannels into metal–organic frameworks (MOFs) overcome their micropore size restriction, enhances mass transportation, improves the accessibility anchored metal clusters. Herein, foamed Ce‐MOF single crystals (F‐Ce‐MOF‐SC‐x) designed from a multiscale co‐assembly is reported in presence copolymer template 1,3,5‐trimethylbenzene as structural regulator. resultant F‐Ce‐MOF‐SC‐x possessed well‐defined microporous tandem‐ordered...
Layered double hydroxides (LDHs) have been intensively studied for high-temperature CO2 capture. However, big differences in the capture capacity, ranging from 0.28 to 0.6 mmol g−1, often reported same Mg–Al–CO3 LDH. Furthermore, how active Mg–O species that are responsible adsorption formed is still unclear. In this work, we performed a comprehensive investigation on characteristics of LDH-derived mixed metal oxides. Based these results proposed possible sites and mechanisms adsorption....
Zeolite-based catalysts have been widely used in the conversion of biomass recently, but catalytic yields desired products are strongly limited by relatively small micropores zeolite. Here, we reported a hierarchically porous ZSM-5 zeolite with micropore and b-axis-aligned mesopore-supported Ru nanoparticles (Ru/HZSM-5-OM) that highly efficient for hydrodeoxygenation both bulky phenolic biomolecules to corresponding alkanes. Compared conventional zeolite-supported catalyst, high activities...
Abstract A dual temperature‐ and light‐responsive C 2 H /C 4 separation switch in a diarylethene metal–organic framework (MOF) is presented. At 195 K 100 kPa this MOF shows ultrahigh selectivity of 47.1, which almost 21.4 times larger than the corresponding value 2.2 at 293 kPa, or 15.7 3.0 for material under UV kPa. The origin unique control selectivity, as unveiled by density functional calculations, due to guest discriminatory gate‐opening effect from unit.
Post-synthetic dealumination treatment is a common tactic adopted to improve the catalytic performance of industrialized zeolitic catalysts through enhancements in acidity and stability. However, among possible extra-framework aluminum (EFAL) species dealuminated zeolites such as Al3+, Al(OH)2+, AlO+, AlOOH, Al(OH)3, presence tri-coordinated EFAL-Al3+ species, which exhibit large quadrupolar effect due lack hydrogen-bonding was normally undetectable by conventional one- two-dimensional 1H...
Crystallization of AlPO4-5 with AFI structure under solvent-free conditions has been investigated. Attention was mainly focused on the characterization intermediate phases formed at early stages during crystallization. The development in long-range ordering solid as a function crystallization time monitored by XRD, SEM, IR, UV-Raman, and MAS NMR techniques. Particularly, UV-Raman spectroscopy employed to obtain information formation process framework. J-HMQC (27)Al/(31)P double-resonance...
Altering the exposed facet of CeO2 nanocrystallites and hence control surface chemistry on nano level have been shown to significantly change their performances in various catalytic reactions. The chemical state Ce, which is associated with Lewis acidity adsorption/activation energy reactants surface, expected vary hosted facets. Unfortunately, traditional tools fail differentiate/quantify them among facets thus led different interpretations researchers past decades. Herein, probe-assisted...
Neutral ketene is a crucial intermediate during zeolite carbonylation reactions. In this work, the roles of and its derivates (viz., acylium ion surface acetyl) associated with direct C–C bond coupling reaction have been theoretically investigated under realistic conditions further validated by synchrotron radiation X-ray diffraction (SR-XRD) Fourier transformed infrared (FT-IR) studies. It has demonstrated that confinement effect significant influence on formation, stability, transformation...
Abstract Designing heterogeneous metal‐free catalysts for hydrogenation is a long‐standing challenge in catalysis. Nanodiamond‐based carbon materials were prepared that are surface‐doped with electron‐rich nitrogen and electron‐deficient boron. The two heteroatoms directly bonded to each other form unquenched Lewis pairs infinite π‐electron donation from the surrounding graphitic structure. Remarkably, these can split H 2 + /H − pairs, which subsequently serve as active species of different...
Stable SAPO-11 nanosheets (10–20 nm thickness) with partially blocked acidity are successfully prepared.
The Lewis acid site combined with a Brønsted in zeolite catalysts facilitates first C–C bond formation the initiation step of MTO reaction.
Experimental evidence for the presence of tert-butyl cations, which are important intermediates in acid-catalyzed heterogeneous reactions, on solid acids has still not been provided to date. By combining density functional theory (DFT) calculations with (1)H/(13)C magic-angle-spinning NMR spectroscopy, cation was successfully identified zeolite H-ZSM-5 upon conversion isobutene by capturing this intermediate ammonia.
The methanol to olefins conversion over zeolite catalysts is a commercialized process produce light like ethene and propene but its mechanism not well understood. We herein investigated the formation of in reaction H-ZSM-5 zeolite. Three types ethylcyclopentenyl carbocations, that is, 1-methyl-3-ethylcyclopentenyl, 1,4-dimethyl-3-ethylcyclopentenyl, 1,5-dimethyl-3-ethylcyclopentenyl cation were unambiguously identified under working conditions by both solid-state liquid-state NMR...
Abstract The selective hydrogenation–amination of levulinic acid into pyrrolidones is regarded as one the most important reactions to transform biomass‐derived lignocellulose feedstocks valuable chemicals. Here we report on ZrO 2 ‐supported Pd nanoparticles a highly active, chemoselective, and reusable catalyst for with H various amines under mild reaction conditions. Pd/ZrO exhibited marked increase in activity compared conventional catalysts significant enhancement pyrrolidone selectivity....