Topic
Sodium hypophosphite
About: Sodium hypophosphite is a research topic. Over the lifetime, 1695 publications have been published within this topic receiving 15932 citations.
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TL;DR: In this paper, two routes to protected derivatives of 2,5-anhydroallitol were investigated, and the first route, involving a two-step reduction, gave a mixture of 2.5-Anhydro-6-O -benzoyl-3,4,6-tri- O -isopropylidene- D -altritol and a lesser amount of the desired 2.
13 citations
TL;DR: In this article, the effect of different parameters including pH, time, temperature, initial concentration of the dye, and amount of adsorbent on the dye removal efficiency was investigated and the isotherm and kinetics of the process was studied.
13 citations
TL;DR: In this paper, new catalysts with different loading 2, 5, 8 and 11 (wt.%) silver on silica gel were prepared by chemical reduction method using a sodium-hypophosphite as a novel reducing agent.
Abstract: New catalysts with different loading 2, 5, 8 and 11 (wt.%) silver on silica gel were prepared by chemical reduction method using a sodium-hypophosphite as a novel reducing agent. The catalytic activity was studied through the dehydrogenation of ethanol in a micro catalytic pulse system at 300–450 °C and at hydrogen flow rate 50 mL/min. The structural changes that accompanying the catalysts preparation were detected by X-ray diffraction, differential scanning calorimetry and infrared techniques. Results show that ethanol dehydrogenation was mainly dependent on the silver content and metal-support interaction. In other words, catalyst sample containing 8% Ag was found the most active and selective for acetaldehyde formation and that contain 11% Ag is rich with silver silicate in certain mode. A texture property of the prepared catalysts was investigated.
13 citations
Patent•
17 Jun 2009
TL;DR: In this article, a method for preparing carbon-supported nucleocapsid type Ni-Pt particles for direct methanol fuel cell catalysts is presented, which consists of adopting sodium citrate as a stabilizer, adopting cationic surfactant CTAB as dispersant, using sodium hypophosphite to reduce nickel acetate, generating a Ni kernel on the surface of Vulcan XC-72 or mesoporous carbon treated with sodium borohydride, washing superfluous sodium pyrophosphite and generating a Pt shell on the Ni kernel through
Abstract: The invention provides a method for preparing carbon-supported nucleocapsid type Ni-Pt particles for direct methanol fuel cell catalysts, which belongs to a preparation process of direct methanol fuel cell catalysts. The method comprises the steps of adopting sodium citrate as a stabilizer, adopting cationic surfactant CTAB as dispersant, using sodium hypophosphite to reduce nickel acetate, generating a Ni kernel on the surface of Vulcan XC-72 or mesoporous carbon treated with sodium borohydride, washing superfluous sodium hypophosphite and generating a Pt shell on the surface of the Ni kernel through chemical replacement. The catalyst has a structure with the Ni kernel and the Pt shell, and has the advantages of low Pt support amount and high catalytic activity.
13 citations
Patent•
03 Sep 2008
TL;DR: In this paper, a chemical liquid-phase method was proposed for the preparation and storage of silver nano-particles for conductive adhesive, in particular to a method for preparing silver nanoparticles by reducing high-concentration silver nitrate.
Abstract: The invention relates to the preparation and storage method of silver nano-particles for conductive adhesive, in particular to a method for preparing silver nano-particles by reducing high-concentration silver nitrate by adopting a chemical liquid-phase method. The method comprises the following steps: mixing sodium hypophosphite, polyvinyl pyrrolidone and sodium hexametaphosphate to obtain reduction solution, adding sulfuric acid dropwise to adjust pH value, adding silver nitrate solution into the reduction solution under magnetically stirring to obtain silver colloid, standing, centrifugally separating, recovering filtrate, concentrating, centrifugally separating, washing the solid, vacuum-drying to obtain silver nano-particles, sealing and packaging, and storing at low temperature. The method adopts high-concentration silver nitrate solution, and has the advantages of simple process flow, high yield of silver powder, short production cycle and good safety. In the separation process, the filtrate can be recovered to improve the coefficient of recovery of silver powder. The silver nano-particle has spherical shape, uniform particle diameter, narrow distribution, high purity, good dispersibility, good storage stability and long storage time without oxidization, and can be used for conductive filler such as conductive adhesive.
13 citations