Sodium hypophosphite

About: Sodium hypophosphite is a research topic. Over the lifetime, 1695 publications have been published within this topic receiving 15932 citations.

E-glass fibers coated with nickel phosphorous by electroless deposition technique

Abstract: The nickel phosphorous catalyst coating was studied on the E-glass fiber by electroless deposition using sodium hypophosphite as a reducing agent in alkaline medium. The effects of deposition time, deposition temperature, pH of the solution, and amount of stabilizer used in the solution on the coating efficiency were investigated by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDAX), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential thermal analysis (DTA). The XRD indicates the presence of amorphous and crystalline phases of Ni and nickel–phosphorous (NiP). From TGA, it is evident that the NiP coating increases the thermal stability and magnetic properties of the glass fiber. The bath temperature of 80 °C, pH of 9 to 9.5, and stabilizer concentration of 25 g/l are optimum to get a good and uniform coating of NiP on glass fiber. Carbon nanotubes were successfully coated on NiP coated glass fiber at a temperature of 700 °C.

Production of high-surface area metal-deposited catalyst

Abstract: PURPOSE: To obtain the high-surface area metal-deposited catalyst which is deposited with a catalyst metal to a uniform grain size with a high degree of dispersion on a carrier and deposited with the simple substance of the metal having the high resistance to sintering is obtd. by using a reducing agent having the weak reducing power as a reducing agent and contg. phosphorus atoms at the time of depositing the catalyst metal on the abovementioned carrier. CONSTITUTION: The soln. of metal-contg. ions consisting of platinum and/or palladium is reduced by using 1 or ≥2 reducing agents selected from a group consisting of sodium hypophosphite, potassium hypophosphite, and ammonium hypophosphite to reduce the abovementioned metal-contg. ions to the metal. The abovementioned metal is deposited on the carrier consisting of carbon or inorg. oxide. The high-surface area metal-deposited catalyst which is deposited with the catalyst metal to the uniform grain size with the high degree of dispersion on the carrier and deposited with the simple substance of the metal having the high resistance to the sintering is obtd. by this method. COPYRIGHT: (C)1990,JPO&Japio

Preparation method of integral type catalyst with low content of noble metal and application thereof

Abstract: The invention discloses a preparation method of an integral type catalyst with low content of noble metal and an application thereof. In the invention, the preparation method comprises the following steps of: adopting a chemical plating method, utilizing hydrazine or sodium hypophosphite as a reducer, generating an oxidation-reduction reaction with palladium chloride or chloroplatinic acid in a plating bath and depositing metallic Pd and/or Pt on the surface of a cordierite honeycomb ceramic pore canal directly under the autocatalytic action of Pd or Pt simultaneously so as to obtain a load-type integral type catalyst with low content of the noble metal of the Pt and/or the Pd; the integral type catalyst with the noble metal, which is prepared by the invention, is applied to the purifyingtreatment of the catalytic combustion of toluene; though the content of the noble metal in the integral type catalyst prepared by the invention is only 0.12-0.60wt%, the conversion rate of the toluene reaches 99% at the lower temperature of 186-244 DEG C when the integral type catalyst is used for the purifying treatment of the catalytic combustion of the toluene, and the concentration of the toluene is lowered below 40mg/m ; and the invention is the integral type catalyst for treating VOCs (volatile organic chemicals) by low-temperature catalytic combustion, which has lower cost, simple preparation and obvious purifying effect.