It is of vital importance to develop a high performance catalyst for the commercial utilization of a NO/sub x/ reduction plant. There are several requirements for the catalyst: it must have a high activity and selectivity for the NO/sub x/--NH/sub 3/ reaction; it must be resistant to SO/sub x/ poisoning for stable and reliable operation of an NO/sub x/ reduction plant. A life list of the catalyst was carried out using a bench-scale test plant, which treated a flue gas from a residiuum oil-fired boiler. A mechanism for the NO--NH/sub 3/ reaction was investigated using the NR-catalysts. The NO conversion as a function of the NO/NH/sub 3/ ratio was studied using NR-600 catalyst. The effect of oxygen in the NO--NH/sub 3/ reaction was studied using a gas mixture with or without O/sub 2/. Based on the experience of many pilot plants, Hitachi Ltd. has constructed about 10 commercial NO/sub x/ reduction plants. A plant treating a flue gas from a coke oven plant at a gas flow rate of 500,000 Nm/sup 3//h has been operated for about 2 years. The largest plant treated a flue gas from a LNG-fired boiler at a gas flow rate of 2,000,000 Nm/sup 3//h. Severalmore » plants treating a petroleum-fired boiler flue gas have been operated successfully. A small plant, which treated a NO/sub 2/-containing gas at 210/sup 0/C, was operated very stably. 9 figures, 3 tables.« less
Silica glass films were coated on polypropylene (PP) microporous membrane separators by a dip coating method, in which polysilazane diluted with xylene was used as precursor material for the silica glass. Scanning electron microscopy (SEM) observation showed that the silica glass films were uniformly coated on the separator surfaces, while Fourier transform infrared spectroscopy (FTIR) measurements revealed that almost all polysilazane in the as-prepared films was converted to silica after heating at 100°C in a steam oven. In addition, the thermal shrinkage properties of the PP microporous membrane separators were significantly improved after coating. Electrochemical studies of an Al ion-doped lithium manganese oxide cathode were conducted to evaluate the coating effect on the properties of the PP microporous membrane separator. The results revealed that rechargeable capacity, cycle stability, and rate performance of the lithium-ion batteries were not changed by the silica glass coating.
Abstract The equilibrium constants, enthalpy, and entropy of the reversible binding of nitrogen oxide to Fe(II)edta in an aqueous solution have been measured in the temperature range 38.5 to 70 °C. Experiments were carried out by absorbing NO under O2 free conditions. The results show that, in the absorption of NO with Fe(II)edta solution, the value of ΔH° is −15.8 kcal/mol and ΔS° is −20.7 e.u.
Fuel cells generate efficient and clean energy and they are noticed as the power source of autobotive vehicles in the near future. The objective of this study is to estimate the performance of the response power of fuel cells when the demand power is given, by a dynamic simulation. It is shown that the stat-up performance of fuel cells is rapid at the outside air temperature of 10℃, and the fuel cell road reaches the maximum power in 10 seconds.
Methanol reform is one of candidates for the hydrogen resource of the fuel cell. Because of low pressure loss, the authors tried to use honeycomb catalysts instead of sphere catalysts at methanol reformer. We evaluated the performance of the honeycomb catalysts of the methanol reformer and the preferential CO oxidation. Compared to the sphere catalysts and the honeycomb catalysts against SV and surface area of the catalysts shows the performance of the honeycomb catalysts appears to correspond with the sphere catalysts in same reaction area compared to same SV. This means that the reforming and oxidation reaction occur on the surface of a catalyst. In order to improve the performance of the honeycomb catalysts it is effective to enlarge the area of the honeycomb by fining cell honeycomb.
