Facile Synthesis and Characterization of Nanostructured Transition Metal/Ceria Solid Solutions (TMxCe1-xO2-delta, TM = Mn, Ni, Co, or Fe) for CO Oxidation

We developed a general synthetic route for preparing nanoporous transition metal/ceria solid solutions with nanocrystalline frameworks (TMxCe1-xO2-delta, TM = Mn, Ni, Co, or Fe). Their structural properties were characterized using transmission electron microscopy (TEM), X-ray powder diffraction (XRPD), and N-2 sorption. Through thermolysis of bimetallic coordination polymers, hierarchically nanoporous frameworks composed of 3-4 nm TMxCe1-xO2-delta solid solution nano crystals in which the transition metal ions are well dispersed in the ceria lattice as evidenced by the Rietveld refinement of the XRPD patterns were synthesized. The electronic properties of the MnxCe1-xO2-delta solid solutions at up to 20 mol % were examined by Raman spectroscopy and Xray photoelectron spectroscopy analysis, and H-2-temperature-programmed reduction results demonstrated the altered physicochemical properties, e.g., hydrogen reduction behaviors, due to the doping. CO oxidation studies of MnxCe1-xO2-delta reveal that the Mn species are responsible for increasing the catalytic activity by an order of magnitude compared to that of pure ceria, by creating nanostructures with accessible pores and active sites on the inner surface. This facile synthetic approach can create nanoporous solid solutions with nanocrystalline frameworks and devise structures and compositions. Therefore, our approach opens new avenues for developing multimetallic catalyst systems.clos

Diffuse Alveolar Hemorrhage Confirmed by Bronchoalveolar Lavage in a Patient with Hemoptysis after Sildenafil Use for Erectile Dysfunction

A 81-year-old man was referred for respiratory failure by emergency medical technicians. He admitted at intensive care unit for ventilator treatment. Several hours before admission, he took sildenafil 100 mg for erectile dysfunction without prescription. The episodes of hemoptysis occurred several hours later. Computed tomography revealed multifocal diffuse ground-glass attenuation in both lungs. And the more we performed bronchoalveolar lavage, the more the color of it was turned into red. We treated him with empirical antibiotics and tranexamic acid, and hemoptysis was stopped in one day after admission. But in the 5th admission day, he died from sepsis combined with pneumonia caused by <i>Acinetobacter baumannii</i> abruptly

Facile Synthesis and Characterization of Nanostructured Transition Metal/Ceria Solid Solutions (TM_<i>x</i>Ce_1–<i>x</i>O_2−δ, TM = Mn, Ni, Co, or Fe) for CO Oxidation

We developed a general synthetic route for preparing nanoporous transition metal/ceria solid solutions with nanocrystalline frameworks (TM_<i>x</i>Ce_1–<i>x</i>O_2−δ, TM = Mn, Ni, Co, or Fe). Their structural properties were characterized using transmission electron microscopy (TEM), X-ray powder diffraction (XRPD), and N₂ sorption. Through thermolysis of bimetallic coordination polymers, hierarchically nanoporous frameworks composed of 3–4 nm TM_<i>x</i>Ce_1–<i>x</i>O_2−δ solid solution nanocrystals in which the transition metal ions are well-dispersed in the ceria lattice as evidenced by the Rietveld refinement of the XRPD patterns were synthesized. The electronic properties of the Mn_<i>x</i>Ce_1–<i>x</i>O_2−δ solid solutions at up to 20 mol % were examined by Raman spectroscopy and X-ray photoelectron spectroscopy analysis, and H₂-temperature-programmed reduction results demonstrated the altered physicochemical properties, e.g., hydrogen reduction behaviors, due to the doping. CO oxidation studies of Mn_<i>x</i>Ce_1–<i>x</i>O_2−δ reveal that the Mn species are responsible for increasing the catalytic activity by an order of magnitude compared to that of pure ceria, by creating nanostructures with accessible pores and active sites on the inner surface. This facile synthetic approach can create nanoporous solid solutions with nanocrystalline frameworks and devise structures and compositions. Therefore, our approach opens new avenues for developing multimetallic catalyst systems