ABSTRACT
Nickel-iron/magnesium/aluminum bimetallic catalysts were prepared by the calcination and reduction of nickel-magnesium-iron-aluminum hydrotalcite-like compounds. Characterization suggests that, at iron/nickel≤0.5, both nickel and iron species are homogeneously distributed in the hydrotalcite precursor and incorporated into the Mg(Ni, Fe, Al)O periclase after calcination, giving rise to uniform nickel-iron alloy nanoparticles after reduction. Ni-Fe/Mg/Al (Fe/Ni=0.25) exhibits the best catalytic performance for the steam reforming of tar derived from the pyrolysis of biomass. It is suggested that the uniform nickel-iron alloy nanoparticles and the synergy between nickel and iron are responsible for the high catalytic performance. Moreover, the Ni-Fe/Mg/Al catalyst exhibits much better regenerability toward oxidation-reduction treatment for the removal of deposited coke than that of conventional Ni-Fe/α-Al2 O3 . This property can be attributed to the better regeneration of Ni-Fe alloy nanoparticles through the formation and reduction of Mg(Ni, Fe, Al)O.
Subject(s)
Alloys/chemistry , Aluminum Hydroxide/chemistry , Biomass , Iron/chemistry , Magnesium Hydroxide/chemistry , Metal Nanoparticles/chemistry , Nickel/chemistry , Tars/chemistry , Catalysis , Oxidation-ReductionABSTRACT
Doing fine with Ni-Fe: The calcination and reduction of a hydrotalcite precursor containing Ni and Fe ions gives uniform Ni-Fe alloy nanoparticles mixed with Mg(Ni, Fe, Al)O particles. The uniformity of the Ni-Fe alloy nanoparticles is connected to the catalyst's high activity and resistance to coke formation in toluene and phenol steam reforming reactions.
Subject(s)
Alloys/chemistry , Coke , Iron/chemistry , Nanoparticles/chemistry , Nickel/chemistry , Steam , Adsorption , Aluminum Hydroxide/chemistry , Catalysis , Hot Temperature , Hydrogen/chemistry , Magnesium Hydroxide/chemistry , Microscopy, Electron, Scanning Transmission , Particle Size , Phenol/chemistry , Surface Properties , Toluene/chemistry , X-Ray DiffractionSubject(s)
Cyclosporine/adverse effects , Dermatologic Agents/adverse effects , Leukemia-Lymphoma, Adult T-Cell/chemically induced , Psoriasis/drug therapy , Administration, Oral , Aged , Cyclosporine/administration & dosage , Dermatologic Agents/administration & dosage , Humans , Leukemia-Lymphoma, Adult T-Cell/diagnosis , MaleSubject(s)
Anticonvulsants/administration & dosage , Primary Myelofibrosis/drug therapy , Valproic Acid/administration & dosage , Aged , Blood Cell Count , Epilepsy/blood , Epilepsy/complications , Epilepsy/prevention & control , Female , Hemorrhage/blood , Hemorrhage/drug therapy , Hemorrhage/etiology , Humans , Primary Myelofibrosis/blood , Primary Myelofibrosis/complications , Valproic Acid/bloodABSTRACT
A 16-year-old female, who was diagnosed as having non-Hodgkin lymphoma following a biopsy of a tumor of her right breast, was admitted to our hospital. The diagnosis made by the referring hospital was not reconfirmed because of the pathological findings with suspicion of sarcoma. As another tumor appeared in the contralateral breast 10 days after hospitalization, a second biopsy of the tumor was performed. Touch preparations of the tumor were positive for myeloperoxidase and naphthol AS-D chloroacetate esterase staining. The diagnosis of granulocytic sarcoma (GS) was made. No abnormalities were found in the peripheral blood and bone marrow at this time. Chromosomal examination of the bone marrow was normal. The number of copies for WT-1 mRNA was high both in the bone marrow cells and the tumor cells. The expression of WT-1 mRNA in peripheral blood was not detected. She was treated with the same protocol as for acute myelogenous leukemia and the breast tumor disappeared. The titer of WT-1 mRNA in bone marrow slightly decreased but remained high. Taken together, these findings suggest that the GS seems to be bone marrow origin and the monitoring of WT-1 mRNA may be useful for early diagnosis of any relapse.
