A5002411113- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Solid-state spectroscopy and crystallography
- Quantum, superfluid, helium dynamics
- Hydrogen Storage and Materials
- Catalytic Processes in Materials Science
- NMR spectroscopy and applications
- Advanced Chemical Physics Studies
- Muon and positron interactions and applications
- Advanced MRI Techniques and Applications
- Catalysts for Methane Reforming
- Nanomaterials for catalytic reactions
- Metal-Organic Frameworks: Synthesis and Applications
- Electron Spin Resonance Studies
- Inorganic Fluorides and Related Compounds
- Ammonia Synthesis and Nitrogen Reduction
- Magnetism in coordination complexes
- Catalysis and Hydrodesulfurization Studies
- Asymmetric Hydrogenation and Catalysis
- Advanced Battery Materials and Technologies
- Photoreceptor and optogenetics research
- Diamond and Carbon-based Materials Research
- Radiation Detection and Scintillator Technologies
- Advanced Condensed Matter Physics
- Electron and X-Ray Spectroscopy Techniques
International Tomography Center
2015-2024
Novosibirsk State University
2015-2022
Pd-In/Al2 O3 single-site catalyst was able to show high selectivity (up 98 %) in the gas phase semihydrogenation of propyne. Formation intermetallic Pd-In compound studied by XPS during reduction catalyst. FTIR-CO spectroscopy confirmed nature reduced at temperature. Utilization propyne with parahydrogen allowed produce ≈3400-fold NMR signal enhancement for reaction product propene (polarization=9.3 %), demonstrating large contribution pairwise hydrogen addition route. Significant as well...
Abstract Parahydrogen‐induced polarization (PHIP) was successfully utilized to demonstrate the strong metal–support interaction (SMSI) effect for palladium supported on titania catalysts. Heterogeneous hydrogenation of 1,3‐butadiene over Pd/TiO 2 catalysts led formation 1‐ and 2‐butenes butane, hyperpolarized products were obtained if parahydrogen used in reaction. However, reduced H flow at 500 °C before reaction, observed levels significantly lower or even zero, which indicative...
Abstract Thiophenic compounds are the least reactive organosulfur in fossil fuels, and thiophene is widely used as a model substrate studies of industrially important hydrodesulfurization (HDS) processes. It generally presumed that HDS process can proceed by two possible pathways, namely hydrogenation or direct desulfurization. In this work, parahydrogen‐induced polarization technique was successfully utilized mechanistic study reaction example heterogeneous over supported catalysts presence...
We demonstrate that heterogeneous/biphasic chemical reactions can be monitored with high spectroscopic resolution using zero-field nuclear magnetic resonance spectroscopy. This is possible because susceptibility broadening negligible at ultralow fields. show the two-step hydrogenation of dimethyl acetylenedicarboxylate para-enriched hydrogen gas in conventional glass NMR tubes, as well a titanium tube. The low frequency signals ensure there no significant signal attenuation arising from...
Abstract One of the essential themes in modern catalysis is that bridging gap between its homogeneous and heterogeneous counterparts to combine their individual advantages overcome shortcomings. more incentive can now be added list, namely ability transition metal complexes provide strong nuclear magnetic resonance (NMR) signal enhancement upon use hydrogenations unsaturated compounds with parahydrogen solution. The addition both H atoms a molecule same substrate, prerequisite for such...
Parahydrogen-induced polarization of 13C nuclei by side-arm hydrogenation (PHIP-SAH) for [1-13C]acetate and [1-13C]pyruvate esters with application PH-INEPT-type pulse sequences 1H to transfer is reported, its efficiency compared that based on magnetic field cycling (MFC). The pulse-sequence approach may have merits in some applications because the entire hyperpolarization procedure implemented directly an NMR or MRI instrument, whereas MFC requires a controlled variation at low fields....
We report a catalyst with the highest selectivity toward pairwise hydrogen addition of 7% among supported metal catalysts, found as result variation Rh/TiO<sub>2</sub> preparation procedures.
Metronidazole and nimorazole are antibiotics of a nitroimidazole group originally designed for acting on anaerobic bacteria. These may be potentially utilized as hypoxia radiosensitizers the treatment cancerous tumors. Hyperpolarization 15N nuclei in these compounds using SABRE-SHEATH (Signal Amplification By Reversible Exchange SHield Enables Alignment Transfer to Heteronuclei) approach provides dramatic enhancement detection sensitivity analytes magnetic resonance spectroscopy imaging....
Mechanistic insight into the semihydrogenation of 1-butyne and 2-butyne on Cu nanoparticles supported partially dehydroxylated silica (Cu/SiO<sub>2-700</sub>) was obtained using parahydrogen.
The reductive exsolution of metallic Ru from fluorite-type solid solutions Ln2Ru0.2Ce1.8O7 (Ln = Sm, Nd, La) leads to materials with metal–support interactions that influence the electronic state and catalytic activity Ru. In situ X-ray absorption spectroscopy at K-edge identified increasing temperature, Sm2Ru0.2Ce1.8O7 in a H2 atmosphere proceeds via an intermediate Ruδ+ state, is, Ru4+→Ruδ+→Ru0. photoelectron (XPS) established that, parallel (H2 ca. 500 °C), also Ce4+ ions reduce Ce3+,...
Metronidazole is a prospective hyperpolarized MRI contrast agent with potential hypoxia sensing utility for applications in cancer, stroke, neurodegenerative diseases, etc. We demonstrate pilot procedure production of ∼30 mM [
Parahydrogen-induced polarization (PHIP) is an efficient technique for mechanistic investigations of homogeneous and heterogeneous catalytic hydrogenations. Herein, gas phase hydrogenation six-membered cyclic hydrocarbons (benzene, toluene, cyclohexene, 1,3-cyclohexadiene 1,4-cyclohexadiene) over Rh/TiO2, Pd/TiO2, Pt/TiO2 catalysts was studied using PHIP. As expected, cyclohexene led to the formation cyclohexane which because its symmetry should not exhibit any PHIP effects. However,...
The model Pd and Au mono- bi-metallic (Pd–Au) catalysts were prepared using vapor deposition of metals (Au and/or Pd) under ultrahigh vacuum conditions on the defective highly oriented pyrolytic graphite (HOPG) surface. investigated X-ray photoelectron spectroscopy scanning tunneling microscopy at each stage preparation procedure. For bimetallic catalysts, different procedures used to get structures PdAu particles (Aushell–Pdcore or alloyed). All showed rather narrow size distribution with...
Hyperpolarized (HP) propane produced by the parahydrogen-induced polarization (PHIP) technique has been recently introduced as a promising contrast agent for functional lung magnetic resonance (MR) imaging. However, its short lifetime due to spin-lattice relaxation time T1 of less than 1 s in gas phase is significant translational challenge potential biomedical applications. The previously demonstrated approach extending HP state through long-lived spin states allows be increased factor ∼3....
Abstract Metronidazole and nimorazole are antibiotics of a nitroimidazole group which also may be potentially utilized as hypoxia radiosensitizers for the treatment cancerous tumors. Hyperpolarization 15 N nuclei in these compounds using SABRE‐SHEATH (Signal Amplification By Reversible Exchange SHield Enables Alignment Transfer to Heteronuclei) approach provides dramatic enhancement detection sensitivity analytes magnetic resonance spectroscopy imaging. Methanol‐d 4 is conventionally...
The feasibility of ultrafast (1.7 s) ventilation MRI with a 1 × 50 mm 3 voxel size is demonstrated using hyperpolarized propane gas contrast agent in excised rabbit lungs on 0.35 T clinical scanner without any modification.
Abstract. Production of hyperpolarized catalyst-free gases and liquids by heterogeneous hydrogenation with parahydrogen can be useful for various technical as well biomedical applications, including in vivo studies, investigations mechanisms industrially important catalytic processes, enrichment nuclear spin isomers polyatomic gases, more. In this regard, the wide systematic search catalysts effective pairwise H2 addition required observation parahydrogen-induced polarization (PHIP) effects...