43results about How to "Improve hydrogen absorption performance" patented technology

The invention relates to a novel catalytic agent for preparing p-aminophenol by using nitrobenzene catalytic hydrogenation and a preparation method thereof. The catalytic agent enables active carbon to serve as a carrier, enables Pt to serve as a main catalytic agent and enables MoS2 to serve as an auxiliary catalytic agent. The preparation step of the catalytic agent comprises (1) preparing Pt / C catalytic agent, namely enabling the Pt to be loaded on the activated carbon through an infusion process; and (2) restoring the auxiliary catalytic agent MoS2 through steeping and roasting under certain H2, loading on the Pt / C, and finally obtaining the catalytic agent for preparing the p-aminophenol. The catalytic agent for synthesizing the p-aminophenol is high in productivity and high in selectivity, and the catalytic agent is good in stability. After 23 times of circulation, the catalytic agent keeps good activity, yield coefficient of the p-aminophenol is above 83%, and the catalytic agent has good industrial application prospect.

The invention discloses a CaMg2-based alloy hydride hydrolysis hydrogen production material and a preparation method and application of the CaMg2-based alloy hydride hydrolysis hydrogen production material. The general formula of the CaMg2-based alloy hydride hydrolysis hydrogen production material is CaMgxMyHz, wherein M is Ni or Co or Fe, 1.5<=x<2.0, 0<y<=0.5, and 3<=z<6. The preparation method of the material includes the following steps that first, three kinds of pure metal blocks are stacked in a crucible, wherein the M metal block is arranged on the top; second, the crucible is installed in a high-frequency induction melting furnace, vacuumization is performed, and argon is introduced; third, the high-frequency induction melting furnace is started, low-power heating is first performed, and then, the power is increased so that the metal blocks can be evenly molten; the crucible is cooled along with the furnace, alloy ingots are obtained, and CaMg2-based hydrogen storing alloy is obtained after the alloy ingots are smashed through a hammer; fourth, the alloy ingots which are smashed through the hammer are hydrogenated, and the hydrolysis hydrogen production material is obtained. The preparation method is simple, cost is low, the material can absorb hydrogen at normal temperature and is good in hydrogen absorbing performance, and prepared hydrogen is pure and can be directly introduced into a hydrogen fuel cell for use.

An alkaline storage battery including a positive electrode (1), a negative electrode (2) using a hydrogen-absorbing alloy, and an alkaline electrolyte solution employs, as the hydrogen-absorbing alloy in the negative electrode, a hydrogen-absorbing alloy for alkaline storage batteries including at least a rare-earth element, magnesium, nickel, and aluminum, and having an intensity ratio IA / IB of 1.00 or greater, wherein IA is the strongest peak intensity appearing in the range 2θ=32°-33° and IB is the strongest peak intensity appearing in the range 2θ=35°-36° in an X-ray diffraction analysis using Cu- Kα radiation as the X-ray source.

The invention relates to a preparation method of a hydrogen absorption component. The preparation method comprises the following steps: suspension induction melting or medium-frequency induction melting is carried out on a raw material metal and / or an intermediate alloy to obtain a target ingredient alloy ingot; after vacuum activation of the hydrogen absorption alloy ingot, hydrogenation treatment is carried out to obtain hydrogen-containing alloy particles; the alloy particles undergo ball-milling and screening to make all materials meet jet-milling feeding requirements; the alloy particles are ground into a powder by jet-milling; hydrogenated alloy particles undergo spheroidizing and dehydrogenation by radio frequency plasma discharge spheroidizing; and the obtained powder is pressed or sintered to prepare the hydrogen absorption component. Hydrogen adsorption properties of the hydrogen absorption component prepared by the above method are obviously better than those of a hydrogen absorption component prepared by traditional preparation methods such as a direct crushing method and a hydrogenation crushing method. The prepared hydrogen absorption component has excellent hydrogen absorption properties at high temperature and can replace existing hydrogen absorption components for solar vacuum tubes.

The invention relates to a method for preparing an LPSO (Long Period stacking ordered) phase enhanced magnesium alloy gradient material, belonging to the field of intermetallic compound preparation technology. The method comprises the steps of firstly, mixing pure magnesium and pure yttrium to prepare an Mg-Y alloy block, and then sequentially overlaying a pure magnesium block, a pure zinc block and the Mg-Y alloy block from bottom to top; simultaneously heating the overlaid metal blocks prepared in the above step and divided into the upper part and the lower part so as to remove vapor, and then introducing a protective gas for melting; after the melting process is completed, stopping the heating to the lower part, introducing cooling water so as to cool the lower part, regulating the heating temperature of the upper part to be below 300 DEG C for one-way cooling, then stopping heating, cooling to room temperature, thus preparing the LPSO phase-enhanced magnesium alloy gradient material. According to the method, the LPSO phase enhanced gradient material can be prepared through upward dispersion of Mg element with lower density and downward settlement of Zn and Y atoms with high density in the one-way cooling process.

The invention discloses a rare earth additive for hard alloy. The rare earth additive for hard alloy is rare earth-binder phase alloy powder with a granularity smaller than 10mum, and the weight percentage of components of the raw materials are as follows: 60-99 percent of binder phase raw material and 1-40 percent of rare earth, wherein the binder phase raw material is formed by Co, Mn and M, and M is at least one out of Ni, Fe, Cr, V, Cu and Al. Two preparation methods are available for the rare earth additive. The first preparation method comprises the steps of casting the binder phase raw material and the rare earth into ingot, smashing the ingot into blocks with size smaller than 20mm, performing homogenizing annealing to the blocks under vacuum condition, or performing rapid quenching to the blocks in an electric-arc remelting rapid quenching furnace to form a rare earth-binder phase alloy thin strip and performing hydrogen absorption, and carrying out ball-milling smashing to the product treated by hydrogen absorption under the protection of argon. The second preparation method comprises the steps of casting the binder phase raw material and the rare earth into ingot, smashing the ingot into blocks with size smaller than 20mm, and performing atomization to the alloy blocks after the alloy blocks are smelted into alloy melts, so as to form atomized powder.

The invention discloses a high-pressure hydrogen gas supply device, which comprises a closed hydrogen storage chemical bed filled with an LaNi5 material, an outlet pipeline connected with an inner space of the hydrogen storage chemical bed, a first high pressure valve and a pressure sensor which are arranged on the output pipeline, a heater arranged by wrapping the hydrogen storage chemical bed, and a temperature controller connected with the heater. The hydrogen is stored by adopting a solid hydrogen storage material, a large and bulky steel cylinder for storing high-pressure hydrogen gas is not needed, and the extremely low temperature conditions for the storage of liquid hydrogen are not needed; when the hydrogen needs to be stored, an alloy is reacted with hydrogen to produce a metal hydride and heat is released; when the hydrogen needs to be used, the hydrogen stored in the solid hydrogen storage material is released by heating or decompression.