A5076614331- X-ray Diffraction in Crystallography
- Zeolite Catalysis and Synthesis
- Crystallization and Solubility Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Mesoporous Materials and Catalysis
- Chemical Synthesis and Characterization
- Catalytic Processes in Materials Science
- Crystallography and molecular interactions
- Crystal Structures and Properties
- Quasicrystal Structures and Properties
- Advanced NMR Techniques and Applications
- Covalent Organic Framework Applications
- Catalysis and Hydrodesulfurization Studies
- Rare-earth and actinide compounds
- Hydrocarbon exploration and reservoir analysis
- Iron-based superconductors research
- Nanocluster Synthesis and Applications
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Advanced Electron Microscopy Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Clay minerals and soil interactions
- Catalysis for Biomass Conversion
- Bauxite Residue and Utilization
- CO2 Reduction Techniques and Catalysts
Hebei University
2024-2025
Robert Bosch (Germany)
2023
Korea Astronomy and Space Science Institute
2022
Stockholm University
2012-2021
Inner Mongolia Yili Industrial Group (China)
2019-2020
Syngenta (China)
2018
Kanazawa University
2012
Central South University
2010
The crystal structure of a new covalent organic framework, termed COF-320, is determined by single-crystal 3D electron diffraction using the rotation (RED) method for data collection. COF crystals are prepared an imine condensation tetra-(4-anilyl)methane and 4,4'-biphenyldialdehyde in 1,4-dioxane at 120 °C to produce highly porous 9-fold interwoven diamond net. COF-320 exhibits permanent porosity with Langmuir surface area 2400 m(2)/g methane total uptake 15.0 wt % (176 cm(3)/cm(3)) 25 80...
The influence of different iron carbides on the activity and selectivity iron-based Fischer–Tropsch catalysts has been studied. Different carbide phases are obtained by pretreatment a binary Fe/SiO2 model catalyst (prepared coprecipitation method) to gas atmospheres (syngas, CO, or H2). phase structures, compositions, particle sizes characterized systematically XRD, XAFS, MES, TEM. It is found that in syngas-treated only χ-Fe5C2 formed. In CO-treated catalyst, Fe7C3 with bimodal size...
A series of highly porous isoreticular lanthanide-based metal–organic frameworks (LnMOFs) denoted as SUMOF-7I to SUMOF-7IV (SU = Stockholm University; Ln La, Ce, Pr, Nd, Sm, Eu, and Gd) have been synthesized using tritopic carboxylates the organic linkers. The SUMOF-7 materials display one-dimensional pseudohexagonal channels with pore diameter gradually enlarged from 8.4 23.9 Å, a result increasing sizes structures solved by single crystal X-ray diffraction or rotation electron (RED)...
Abstract Palladium nanoparticles have been immobilized into an amino‐functionalized metal–organic framework (MOF), MIL‐101Cr‐NH 2 , to form Pd@MIL‐101Cr‐NH . Four materials with different loadings of palladium prepared (denoted as 4‐, 8‐, 12‐, and 16 wt %Pd@MIL‐101Cr‐NH ). The effects catalyst loading the size distribution Pd on catalytic performance studied. catalysts were characterized by using scanning electron microscopy (SEM), transmission (TEM), Fourier‐transform infrared (FTIR)...
Two families of metal–organic frameworks (MOFs), MIL-88 and MIL-101 built by trinuclear transition metal (TM) clusters (TM = Cr, Fe, or Sc), have been known for several years, but their syntheses are often reported separately. In fact, these MOFs polymorphs, framework isomers: they assembled from the same secondary building units organic linkers, connectivity components differs. Here we report first time synthesis vanadium MOF MIL-88B(V) compare its parameters to those MIL-47(V) recently...
The synthesis of crystalline microporous materials containing large pores is in high demand by industry, especially for the use these as catalysts chemical processes involving bulky molecules. An extra-large–pore silicoaluminophosphate with 16-ring openings, ITQ-51, has been synthesized aromatic proton sponges organic structure-directing agents. Proton show exceptional properties directing extra-large zeolites because their unusually basicity combined size and rigidity. This material stable...
Stable, multidimensional, and extra-large pore zeolites are desirable by industry for catalysis separation of bulky molecules. Here we report EMM-23, the first stable, three-dimensional aluminosilicate zeolite. The structure EMM-23 was determined from submicron-sized crystals combining electron crystallography, solid-state nuclear magnetic resonance (NMR), powder X-ray diffraction. framework contains highly unusual trilobe-shaped pores that bound 21-24 tetrahedral atoms. These intersected...
A multi-dimensional extra-large pore silicogermanate zeolite, named ITQ-54, has been synthesised by in situ decomposition of the N,N-dicyclohexylisoindolinium cation into N-cyclohexylisoindolinium cation. Its structure was solved 3D rotation electron diffraction (RED) from crystals ca. 1 μm size. The ITQ-54 contains straight intersecting 20 × 14 12-ring channels along three crystallographic axes and it is one few zeolites with more than direction. a framework density 11.1 T atoms per 1000...
Persistent activation of drought tolerance is detrimental to plant growth and development. However, the mechanism that balances remains largely undetermined. Here, we constructed a comprehensive co-expression network comprising 84 transcriptome datasets associated with in oats. Moreover, functional modules many candidate genes related were identified. A key gene, AsHSFA2c was involved fine-tuning balance between by inhibiting positively regulating tolerance. Then, determined AsDOF25 as an...
Knowing the structure of porous materials is essential for understanding their properties and exploiting them applications. Electron crystallography has two main advantages compared to X‐ray diffraction determination. Crystals too small or complicated be studied by can electron crystallography. The crystallographic factor phase information, which lost in diffraction, obtained from high‐resolution transmission microscopy (HRTEM) images. Here, different microscopic techniques applications...
A new germanosilicate zeolite (denoted as ITQ-53) with extra-large pores has been synthesised using tri-tertbutylmethylphosphonium cation the organic structure directing agent (OSDA). Rotation electron diffraction (RED) was used to identify ITQ-53 from an initially-synthesised sample containing impurities, and solve its structure. The refined against PXRD data of pure samples obtained after synthesis optimisation. is first example pore zeolites tri-directional interconnected 14 × 14-ring...
Abstract Particles of iron oxide (Fe 3 O 4 ; 20–40 nm) were embedded within activated carbons during the activation hydrothermally carbonized (HTC) biomasses in a flow CO 2 . Four different HTC biomass samples (horse manure, grass cuttings, beer production waste, and biosludge) used as precursors for carbons. Nanoparticles formed from catalyst included biomasses. After systematic optimization, had specific surface areas about 800 m g −1 The pore size distributions depended strongly on degree...
Ga-Doped ZSM-22 zeolites were synthesized successfully<italic>via</italic>a hydrothermal method and exhibited better catalytic performance in<italic>n</italic>-dodecane isomerization.
Phase identification and structure characterization are important in synthetic materials science. It is difficult to characterize the individual phases from multiphase crystalline powder samples, especially if some of unknown. This problem can be solved by combining rotation electron diffraction (RED) X-ray (PXRD). Four were identified on same transmission microscopy grid a sample Ni–Se–O–Cl system, their structures RED data. 1 (NiSeO 3 ) was found Inorganic Crystal Structure Database using...
Understanding olefin isomerization mechanisms and structures of acid sites is critical in many catalytic reactions petroleum chemistry. Here, we report the mechanism structural investigation on double-bond reaction n-butene over two different Lewis from three-membered rings (3MRs) formed by reconstruction silanol nests dealuminated zeolite β (denoted Si-β) AlCl3 AlCl3@γ-Al2O3. The results obtained using a combination diffuse-reflectance infrared Fourier-transform spectroscopy (DRIFTS)...
Electron diffraction is a complementary technique to single-crystal X-ray and powder for structure solution of unknown crystals. Crystals too small be studied by or complex solved can electron diffraction. The main drawbacks have been the difficulties in collecting complete three-dimensional data conventional methods very time-consuming collection. In addition, intensities suffer from dynamical scattering. Recently, new method, rotation (RED), was developed, which overcome reduce effects. A...
Nano-sized LTL zeolites obtained by the Ba-assisted method show improved catalytic performance in <italic>n</italic>-octane aromatization reaction.
Figure 1.Crystal structures of SUMOF-7I to -IV.The free diameter the pore aperture is given, taking into account van der Waals radii atoms.