Synthesis of a novel highly dispersed manganese oxide on porous calcium silicate for catalytic oxidation of toluene

Herein, a series of novel porous calcium silicate (PCS)-supported manganese oxides (MnOx) catalysts are first prepared by impregnation method using three different manganese precursors (manganese acetate, manganese nitrate and manganese...

Penentuan Status Mutu Air Tanah Dangkal di Sekitar Tempat Pembuangan Akhir Sampah (TPA) Air Sebakul Kota Bengkulu menggunakan Metode STORET: A Cross-Sectional Study

Ground Water quality has a special significance for drinking, hygiene sanitation and domestic water supply. The study aims to understand the distribution of ground water quality in solid waste landfill of Bengkulu City. The following objectives of the study are to determine ground water quality parameters such as pH, total dissolved solid, electrical conductivity, hardness, iron, manganese, nitrate and nitrite. Sampling was carried out at a radius of 0 - 250 meters from the location of the landfill. The results of the pH at 10 sampling points show the values that are quite varied between 6,45 – 7,59; conductivity between 56 µS – 492 µS; TDS between 28 mg/L – 246 mg/L; salinity 32 mg/L – 284 mg/L; Iron (Fe) 0,040 mg/L – 0,323 mg/L; Manganese (Mn) 0,089 mg/L – 0,295 mg/L; Nitrate (NO3-) 0,2 mg/L – 0,8 mg/L and Nitrite (NO2-) 0,006 mg/L – 0,033 mg/L. Based on an assessment with the STORET system, water quality in the study area is classified as good (score =-4) by parameters such as temperature, pH, total dissolved solid, electrical conductivity, hardness, iron, manganese, nitrate and nitrite. By the total sampling sites, all sample site had good-quality water for hygiene sanitation based on STORET method.

Multi-Elements Doped in Mn-Ferrite by Detonation Method

In the present research, a kind of special emulsions explosive was prepared with taking Ferric nitrate and Manganese nitrate as main oxidants and composite oil as fuel, in which the Magnesium and zinc elements were added and doped in Mn ferrites. The results of which were compared by that of detonation of gas (Hydrogen and oxygen). Results indicated that the detonation products were the same structure, i.e. Jacobsite structure. That is to say, Magnesium and zinc elements were successfully doped in MnFe2O4 crystals. TEM indicated that the powders were spherical and average size was about 20~30nm. The product that obtained by gas detonation was better dispersed and worse uniform than that by explosive. Zn and high content Mg both had great effect on the stability and detonation properties of the explosive, which could produce impurities in detonation products.

MnO nanocrystals incorporated in a N-containing carbon matrix for Li ion battery anodes

In this study, MnO nanocrystals incorporated in a N-containing carbon matrix were fabricated by the facile thermal decomposition of manganese nitrate-glycine gels.

Crystal structure of poly[[μ3-4,4′-(4,4′-bipyridine-2,6-diyl)dibenzoato]{μ2-4-[6-(4-carboxyphenyl)-4,4′-bipyridin-4′-ium-2-yl]benzoato}manganese(II)] hemihydrate]

The title compound, {[Mn(C24H14N2O4)(C24H16N2O4)]·0.5H2O}n, was obtained by the reaction of manganese nitrate with the ligand 4,4′-(4,4′-bipyridine-2,6-diyl) dibenzoic acid under hydrothermal conditions. The water O atom is located on a twofold rotation axis. The Mn2+ion is heptacoordinated by six O atoms and one N atom from the ligands. In this structure, the ligands adopts two different forms, one completely deprotonated and one with a protonated N atom (pyridinium) and a carboxylic acid function. In the crystal, N—H...O and O—H...O hydrogen bonds consolidate the packing, forming a three-dimensional framework.

Preparation and Characterization of MnOX-CeO2/TiO2 Catalytic Material for SCR of NOX with NH3 at Low Temperature

The MnOX-CeO2/TiO2 catalytic material for low temperature SCR of NOX with NH3 was prepared using aqueous solutions of three manganese salt as well as cerous nitrate and TiO2(anatase) powder by impregnation method. The properties of the catalytic materials were investigated by TG-DSC, XRF, XRD, XPS, BET and SEM. And the low temperature catalytic activity of the catalytic materials was measured. The results showed that, when manganese nitrate and manganese chloride and manganese acetate were used as precursors, respectively, the primary phases of catalytic materials were MnOx/MnO2, MnO2/Mn8O10Cl3 and Mn3O4/MnO2, the surface Mn/Ti molar ratio were 0.68, 0.19 and 0.88, the surface area were 45.1m2/g, 25.1 m2/g and 48.6 m2/g ,respectively. The optimum NOX conversion rate of catalytic material from manganese nitrate precursor and manganese chloride precursor and manganese acetate precursor were 97.9% at 483K, 86.6% at 513K, 97.2% at 423K, respectively. Consequently, the higher low-temperature activity of MnOX-CeO2/TiO2 from manganese acetate precursor may be attributed to higher surface and higher surface concentration of activity component.