49 results about "Titanium nitrate" patented technology

An atomic layer deposition method is used to deposit a TiN or TiSiN film having a thickness of about 50 nm or less on a substrat. A titanium precursor which is tetrakis(dimethylamido)titanium (TDMAT), tetrakis(diethylamido)titanium (TDEAT), or Ti{OCH(CH3)2}4 avoids halide contamination from a titanium halide precursor and is safer to handle than a titanium nitrate. After a monolayer of the titanium precursor is deposited on a substrate, a nitrogen containing reactant is introduced to form a TiN monolayer which is followed by a second purge. For TiSiN, a silicon source gas is fed into the process chamber after the TiN monolayer formation. The process is repeated several times to produce a composite layer comprised of a plurality of monolayers that fills a contact hole. The ALD method is cost effective and affords an interconnect with lower impurity levels and better step coverage than conventional PECVD or CVD processes.

A vascular or endoluminal stent is adapted to be implanted in a vessel, duct or tract of a human body to maintain an open lumen. The stent includes a base layer of a biologically compatible metal. An intermediate metal particle layer of substantial greater radiopacity overlies the base layer, with particles bonded to the base layer and to each other to leave interstices therebetween as a repository for retaining and dispensing drugs or other agents for time release therefrom. The particles are composed primarily of a noble metal. Exposed surfaces of the particle layer are coated with ceramic-like iridium oxide or titanium nitrate, as a biocompatible material to inhibit irritation of tissue at the inner lining of the vessel when the stent is implanted.

The invention relates to a process for preparing a denitrification catalyst. The process is characterized by comprising the following steps of: firstly, selecting and mixing powdered activated carbon or granular activated carbon which has the C content of more than 90 percent and the specific surface area of more than 1000 m<2> / g into an alcohol amine solution to obtain a suspension liquid for later use; secondly, dissolving a mixed solution of ammonium metavanadate, titanium nitrate and aluminium nitrate in the suspension liquid according to the mass ratio of 10-50 percent to form a sizing agent A; thirdly, dissolving a mixed solution of manganese nitrate, ferric nitrate and copper nitrate in the suspension liquid to form a sizing agent B, coating a carrier with the sizing agent A, drying to a constant weight and then heating to 530-570 DEG C under the protective atmosphere, and carrying out heat preservation for 3-5 hours and subsequently cooling to the room temperature at a temperature reduction speed; and finally, the sizing agent B is coated on the surface of the carrier obtained from the last step, the carrier is dried to a constant weight and then heating to 630-670 DEG C under the atmosphere containing 70 percent of N2, 20 percent of CO2 and 10 percent of CO, carrying out heat preservation and then cooling to the room temperature at a temperature reduction speed to achieve the catalyst in which pores and channels are communicated and are in a two-layer structure. The space velocity of the catalyst can be improved by more than 60 percent, and the resistance is reduced by more than 45 percent, so that a small-sized catalyst device is achieved.

The invention provides a preparation method of a selective catalytic reduction (SCR) catalyst Mn-Ce-M / TiO2 by removing NOx from flue gas, wherein M represents one or more of composite oxides, namely Fe, Co, Cu, Cr, Zr and Al, the molar ratio of the elements is Ti: Mn: Ce: M =1:(0.005-1):(0.005-1):(0-1). In the invention, an improved coprecipitation method is adopted, and an intermediate compound,namely titanium nitrate Ti(NO3)4 is taken as a precursor of TiO2, thus the influence of the other impurities in the precipitation process is overcome; by changing the dispersing homogeneous degree ofMnOx and CeO2 on the surface of a carrier TiO2, the activity of the catalyst is improved and the temperature of the SCR reaction is reduced; by adjusting the preparation condition of the TiO2 precursor, the sulfur resistance and water resistance of the catalyst are improved completely; and by adding the elements, such as Fe, Co, Cu, Cr, Zr and Al and the like, the activity and resistance of the catalyst are further modified.

The present invention discloses a porous silver-titanium composite catalyst preparation method, and belongs to the field of sewage treatment. The preparation method comprises: weighing silver nitrate, titanium tetranitrate and urea, and preparing into a solution, wherein a molar ratio of Ag<+> to Ti<4+> to urea is 2:1:10-4:1:10, and the total concentration of Ag<+> ions and Ti<4+> ions is 4-6 mol / L; carrying out crystallization on the prepared solution for 24-36 h at a temperature of 120-130 DEG C to obtain silver-titanium type hydrotalcite; adding the hydrotalcite to water to prepare a suspension liquid with a solid-liquid ratio of 1:30-1:50, adding an anion surfactant, and stirring for 2-3 h, wherein per g of the hydrotalcite is added with 1-2 mmol of the anion surfactant; and dissolving 30-60 mmol of aminopropyltriethoxysilane in 50 ml of absolute ethanol, adding the obtained solution to the hydrotalcite suspension liquid in a dropwise manner, carrying out solid-liquid separation, drying at a temperature of 90-105 DEG C, and carrying out calcination at a temperature of 450-550 DEG C to prepare the porous silver-titanium composite catalyst with characteristics of large specific surface area, absorption promotion, and good catalysis effect.