A5025142988- Metal-Organic Frameworks: Synthesis and Applications
- Catalytic Processes in Materials Science
- Covalent Organic Framework Applications
- Catalysis and Hydrodesulfurization Studies
- Advanced Photocatalysis Techniques
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
- Machine Learning in Materials Science
- Dendrimers and Hyperbranched Polymers
- Graphene research and applications
- Polyoxometalates: Synthesis and Applications
- Minerals Flotation and Separation Techniques
- Luminescence and Fluorescent Materials
- Enhanced Oil Recovery Techniques
- Zeolite Catalysis and Synthesis
- Metal Extraction and Bioleaching
- Carbon dioxide utilization in catalysis
- Magnetism in coordination complexes
- TiO2 Photocatalysis and Solar Cells
- Ammonia Synthesis and Nitrogen Reduction
- Nanoparticles: synthesis and applications
- Nanoparticle-Based Drug Delivery
- Advanced Nanomaterials in Catalysis
- Advanced Battery Materials and Technologies
- Thermal Expansion and Ionic Conductivity
Rochester Institute of Technology
2023-2024
Northwestern University
2016-2023
Hubei University of Chinese Medicine
2022
Yangzhou University
2005-2022
Sichuan Economic Management Cadre College
2021
Fuzhou University
2021
Tianjin Medical University
2021
Virginia Tech
2021
Tianjin Anding Hospital
2021
Kunming University of Science and Technology
2018-2020
High-stability, zirconium-based metal–organic frameworks are attractive as heterogeneous catalysts and model supports for uniform arrays of subsequently constructed catalysts—for example, MOF-node-grafted metal–oxy metal–sulfur clusters. For hexa-Zr(IV)-MOFs characterized by nodes that less than 12-connected, sites not used linkers ideally occupied reactive displaceable OH/H2O pairs. The desired pairs ideal grafting the aforementioned catalytic clusters, while aqua-ligand lability renders...
The understanding of the catalyst-support interactions has been an important challenge in heterogeneous catalysis since supports can play a vital role controlling properties active species and hence their catalytic performance. Herein, series isostructural mesoporous metal-organic frameworks (MOFs) based on transition metals, lanthanides, actinides (Zr, Hf, Ce, Th) were investigated as for vanadium catalyst. was coordinated to oxo groups MOF node single-ion fashion, determined by...
Few-atom cobalt-oxide clusters, when dispersed on a Zr-based metal-organic framework (MOF) NU-1000, have been shown to be active for the oxidative dehydrogenation (ODH) of propane at low temperatures (<230 °C), affording selective and stable propene production catalyst. In our current work, series promoter ions with varying Lewis acidity, including Ni(II), Zn(II), Al(III), Ti(IV) Mo(VI), are anchored as metal-oxide,hydroxide clusters NU-1000 followed by Co(II) ion deposition, yielding...
Designing new materials for the effective detoxification of chemical warfare agents (CWAs) is current interest given recent use CWAs. Although halogenated boron-dipyrromethene derivatives (4,4-difluoro-4-bora-3a,4a-diaza-s-indacene or BDP BODIPY) at 2 and 6 positions have been extensively explored as efficient photosensitizers generating singlet oxygen (1O2) in homogeneous media, their utilization design porous organic polymers (POPs) has remained elusive due to difficulty controlling...
To modify its steric and electronic properties as a support for heterogeneous catalysts, electron-withdrawing electron-donating ligands, hexafluoroacetylacetonate (Facac–) acetylacetonate (Acac–), were introduced to the metal–organic framework (MOF), NU-1000, via process akin atomic layer deposition (ALD). In absence of Facac– or Acac–, NU-1000-supported, AIM-installed Ni(II) sites yield mixture C4, C6, C8, polymeric products in ethylene oligomerization. (AIM = ALD-like MOFs). contrast, both...
Previous work has shown that introduction of hexafluoroacetylacetone (Facac) units as nonstructural ligands for the zirconia-like nodes eight-connected metal–organic framework (MOF), NU-1000, greatly alters selectivity node-supported oxy-nickel clusters ethylene dimerization vs oligomerization. Here we explore a related concept: tuning support/catalyst interactions, and therefore, catalyst activity, via parallel installation organic modifiers on support itself. As focused para-substituted...
Electrospun polymer fibers containing poly(methyl methacrylate) (PMMA), Ti(OH)<sub>4</sub>, and UiO-66 convert a chemical warfare agent simulant to non-toxic product <italic>via</italic> catalytic hydrolysis.
A chemically and thermally stable, mesoporous, crystalline metal–organic framework, NU-1000, serves as a structurally well-defined support for catalytic reactions. Depositing chromium(III), metal widely used in homogeneous ethylene oligomerization catalysts, onto the Zr6 node of NU-1000 allows atomically precise determination structure Cr3+ catalyst through single-crystal X-ray diffraction studies. Chromium modification was accomplished via solvothermal deposition MOFs (SIM); termed...
Solid supports play an indispensable role in heterogeneous catalysis, as they can directly affect the catalytic activity and selectivity of supported catalysts. However, specific roles such remain to be demystified owing difficulties obtaining precise structural information on To understand effects MOF topology, pore environment, metal identity node activity, a Ni catalyst was eight Zr- or Hf-MOFs based 8-connected nodes: namely M-NU-1200, M-NU-1000, M-NU-1008, M-NU-1010 (M = Zr, Hf)....
Ammonia uptake by high-capacity and high-porosity sorbents is a promising approach to its storage release, capture mitigation, chemical separation. Here, we examined the ammonia sorption behavior of several versions an archetypal zirconium-based metal–organic framework (MOF) material, NU-1000—a meso- microporous crystalline compound having empirical formula (1,3,6,8-tetrakis(p-benzoate)pyrene)2 Zr6(μ3-O)4(μ3-OH)4(H2O)4(OH)4 with linkers nodes arranged satisfy csq topology. Depending on...
Rapid degradation/destruction of chemical warfare agents, especially ones containing a phosphorous–fluorine bond, is notable interest due to their extreme toxicity and typically rapid rate human incapacitation. Recent studies the hydrolytic destruction key nerve agent simulant, dimethyl 4-nitrophenylphosphate (DMNP), catalyzed by Zr6-based metal–organic frameworks (MOFs), have suggested deactivation active sites inhibition products as reaction progresses. In this study, interactions two...
Ammonia capture by porous materials is relevant to protection of humans from chemical threats, while ammonia separation may be its isolation and use following generation emerging electrochemical schemes. Our previous work described both reversible irreversible interactions with the metal–organic framework (MOF) material, NU-1000, thermal treatment at either 120 or 300 °C. In present work, we have examined NU-1000-Cl, a variant that features modified node structure–at ambient temperature,...
Zirconium-based metal-organic frameworks (MOFs) are candidate materials for effective nerve agent detoxification due to their thermo- and water stability as well high density of catalytic Zr sites. However, high-porosity materials, most the active sites Zr-MOFs can only be accessed by diffusion into crystal interior. Therefore, transport agents in nanopores is an important factor performance Zr-MOFs. Here, we investigated process mechanism a vapor-phase simulant, dimethyl methyl phosphonate...
Two new UiO-68 type of Zr-MOFs featuring redox non-innocent catechol-based linkers different activities have been synthesized through a de novo mixed-linker strategy. Metalation the MOFs with Cu(II) precursors triggers reduction by phenyl-catechol groups to Cu(I) concomitant formation semiquinone radicals as evidenced EPR and XPS characterization. The MOF-supported catalysts are selective toward allylic oxidation cyclohexene it is found that presence in situ-generated species exhibits...
The formation of oxygen vacancies via reversible transitions between Ce(IV) and Ce(III) plays a crucial role in the propensity cerium oxide to act as supporting promoter oxidative heterogeneous catalysis. An open challenge is, however, preparation high-porosity, supported arrays isolated ceria(IV, III) clusters with high porosity. Herein, we report two examples oxy-Ce(IV, spatially on an oxy-zirconium MOF, NU-1000. are introduced using either Ce complexes (precursors): CeIV(tmhd)4 (tmhd =...
Chemically functionalized series of metal–organic frameworks (MOFs), with subtle differences in local structure but divergent properties, provide a valuable opportunity to explore how chemistry can be coupled long-range and functionality. Using situ synchrotron X-ray total scattering, powder diffraction pair distribution function (PDF) analysis, we investigate the temperature dependence local- MOFs based on NU-1000, which Zr6O8 nodes are coordinated by different capping ligands (H2O/OH, Cl–...
Metal–organic frameworks (MOFs) have been reported to effectively detoxify chemical warfare agents (CWAs) and their simulants. Early studies of Zr-MOF-catalyzed hydrolytic degradation an organophosphoester type CWA, Sarin, its simulant, dimethyl-4-nitrophenylphosphate (DMNP), suggested that the activity originates from ZrIV–OH–ZrIV moieties resemble structure active-site phosphotriesterase enzyme. Measurements pKa values for hexa-zirconium-node-sited bridging hydroxo, terminal aqua ligands...
Ni(<sc>ii</sc>) ions have been deposited on the Zr<sub>6</sub> nodes of a metal–organic framework (MOF), UiO-66, <italic>via</italic> an ALD-like process (ALD = atomic layer deposition).
Introducing steric hindrance by linker isomerization leading to a new <bold>she</bold>-type Zr-MOF with hierarchical porosity showing high catalytic activity.