34 results about "Zirconia silica" patented technology

A process for the catalytic reduction of nitrogen oxides (NOx) in a gas stream (29) in the presence of H2 is provided. The process comprises contacting the gas stream with a catalyst system (38) comprising zirconia-silica washcoat particles (41), a pre-sulfated zirconia binder (44), and a catalyst combination (40) comprising palladium and at least one of rhodium, ruthenium, or a mixture of ruthenium and rhodium.

The invention discloses a high-frequency, wide-temperature and low-loss soft ferrite material, and in particular relates to the technical field of soft ferrite materials. The rest are manganese oxide; the auxiliary ingredients include calcium carbonate, cobalt trioxide, niobium pentoxide, titanium dioxide, zirconium dioxide, silicon dioxide, copper oxide, tantalum pentoxide and boron trioxide. The invention can effectively improve the resistivity inside the soft ferrite material, thereby reducing the eddy current loss of the magnetic core material during use, and titanium dioxide and tantalum pentoxide have the functions of reducing the loss peak and adjusting the temperature and frequency range at which the peak appears. , which can reduce the residual loss of the magnetic core material during use, and copper oxide can reduce Fe in the magnetic core material 2+ The content of ions can increase the resistivity of the magnetic core material, reduce the loss of the magnetic core material, and can meet the needs of people.

The chromium-free refractory material for RH vacuum furnace lining consists of one or several of magnetize, magnesia zirconia and magnesia zirconia silica 88-97 wt%, fine zirconia powder 1-6 wt%, fine zircon powder 0-9 wt%, and organic binding agent 1-3 wt%. It has the chemical composition of MgO 80-90 wt%, SiO2 1-4 wt%, and ZrO2 7-13 wt%. The organic binding agent is binding agent commonly for refractory material, such as sodium humate, calcium lignosulfonate, dextrin and Arabic gum. The MgO-SiO2-ZrO2 chromium-free refractory material has high slagging resistance and is significant for RH vacuum furnace to obtain long service life.

The invention discloses a method for preparing alpha-phenethyl alcohol by taking a zirconia-silica / graphene hybrid material as a catalyst and belongs to the technical field of chemical synthesis. The method comprises the following steps: by taking acetophenone as a raw material under normal pressure, taking alcohol as a hydrogen source and a solvent, and taking the zirconia-silica / graphene hybrid material as a catalyst, reacting at the reaction temperature of 45-90 DEG C for 2-10 hours, rectifying the reaction solution after the reaction is ended, taking the fraction at the temperature of 105-115 DEG C, thereby obtaining the alpha-phenethyl alcohol. According to the method disclosed by the invention, the zirconia-silica / graphene hybrid material is taken as the catalyst, the hybrid material is prepared by adding silica and doping graphene by virtue of an aerogel mode, the specific surface area and pore size of the catalyst are improved, dispersion of the surface active center is promoted, and the activity of the catalyst is increased. The catalyst is high in selectivity and high in water resistance, is easily separated in the reaction solution and can be repeatedly utilized after separation, the operation is convenient, and the preparation cost is reduced, so that the economic benefits are improved.

The invention discloses micron-sized plate-like zirconium silicate powder and a preparation method thereof. The preparation method comprises the following steps of: uniformly mixing zirconium oxide, silicon dioxide, a molten salt and a forming agent to obtain a reactant; controlling the mol ratio of the zirconium oxide, the silicon dioxide and the forming agent to be 1: 1.05-1.10: 1-3: 0.005-0.04;placing the reactant in a closed container and keeping the temperature at 850-1150 DEG C to obtain a calcined product; and washing and drying the calcined product to obtain the micron-sized plate-like zirconium silicate powder. The preparation method is simple in process, less in environmental pollution and easy for industrial production. The prepared zirconium silicate powder has good crystallization, few defects, regular plate-like shape, micron-sized size and uniform distribution; when the micron-sized plate-like zirconium silicate powder is applied to ceramic glazed tiles, the wear resistance and skid resistance of the ceramic glazed tiles can be obviously improved, the opacifying effect is weak, and the ceramic glazed tiles have good application effect.

The invention discloses a bimetal methanation catalyst for the removal of micro carbon monoxide from a hydrogen-rich gas and a preparation method thereof. The bimetal methanation catalyst contains active components, namely nickel oxide and ferric oxide, loaded on an oxide carrier and an assistant, wherein the assistant is at least one element selected from the main group I, the main group II, thesubgroup I, the subgroup III, the subgroup VI and the subgroup VIII of the periodic table, and the oxide carrier is alumina, titanium dioxide, zirconium dioxide and silicon dioxide or a mixture thereof. The catalyst of the invention can allow the micro carbon monoxide to be removed from the hydrogen-rich gas at a relatively low temperature and has the advantages of low load, high activity, relatively low cost and wide application prospect.