6results about How to "Low activation temperature" patented technology

This invention discloses the application of a carbon-modified noble metal catalyst in the low-temperature combustion of propane or mixed alkanes. The carbon-modified noble metal catalyst is prepared by adding sodium hydroxide solution dropwise to a cerium salt solution, mixing, and reacting to obtain a cerium dioxide support. The cerium dioxide support is then impregnated in an equal volume of noble metal salt solution, dried, and calcined. The calcined product and glucose are added to deionized water, mixed, and subjected to a hydrothermal reaction, followed by drying and calcination to obtain the final product. In this invention, carbon species exist in the form of doping or interstitial filling, inducing lattice distortion and a high concentration of surface oxygen vacancies in the support, significantly improving the mobility of lattice oxygen and the reactivity. Simultaneously, the interfacial carbon species optimize the microelectronic environment of the active center through strong electron interactions, maintaining the low valence state of Ru and the metallic states of Pt and Pd. This catalyst effectively avoids the shielding effect of the carbon layer and exhibits excellent catalytic combustion activity and stability for propane and mixed alkanes at low temperatures.

This invention discloses a method for thermal activation of coal gangue. Using coal gangue and an activating admixture as raw materials, the method involves sequential crushing, mixing and mechanical activation, homogenization, molding, drying, calcination and thermal activation, cooling, and grinding to prepare active powder. This invention uses coal gangue as the main raw material. By adding an activating admixture, the thermal activation temperature of the coal gangue is reduced to below 1000℃, significantly stimulating its activity. Simultaneously, combined with mechanical activation, unsaturated residual bonds are formed in the quartz minerals within the coal gangue, producing active silica, further stimulating the activity of the coal gangue and increasing its activation rate. The prepared active powder exhibits a pozzolanic activity of over 75%, achieving the goal of "waste treatment" and reducing costs. This active powder can be directly added as a mineral admixture during concrete preparation, showing promising application prospects.

The present application relates to a kind of porous carbon material containing alkali metal element and its preparation method.The preparation method includes: (1) carbon material powder and transition metal salt solution are mixed, stirring, dry and placed in inert atmosphere high-temperature treatment, and the carbon material loaded with transition metal particles is prepared;(2) the carbon material loaded with transition metal particles obtained is mixed with alkali metal-containing basic substance, stirring, drying, with inert gas as carrier gas, and after being calcined by reaction gas, in-situ generation of alkali metal element on the surface or interlayer of the carbon material loaded with transition metal particles;(3) the carbon material obtained in step (2) is washed by water, and treated by oxidizing agent to obtain the porous carbon material containing alkali metal element.

The application discloses a porous material, comprising a porous framework, which is formed by mutual adhesion of spherical or non-spherical powder particles in different broken states. The application also discloses a preparation device of the porous material, comprising a melting mechanism, an atomization mechanism and an atomization chamber which are sequentially connected in a top-down manner, wherein a deposition base is arranged in the atomization chamber, and an atomization gas outlet of the atomization mechanism is located directly above the deposition base. The porous blank with high purity, low oxygen content, high porosity and fast solidification structure can be prepared by the device. The application also discloses a preparation method of the porous material, which comprises sequentially melting, atomization deposition, sintering and machining of raw materials, so that the risk of material pollution is reduced, and the composition uniformity, porous performance and mechanical performance of the porous material are ensured.

The invention discloses a biochar purification process, and relates to the technical field of biochar preparation, biochar raw materials are screened, impurity particles with the particle size larger than 50 meshes are removed, and the moisture content of the screened raw materials is controlled to be smaller than or equal to 15%; putting the pretreated raw material into a nitric acid solution with the concentration of 0.1-0.5 mol / L, stirring and dipping at 50-70 DEG C for 1-3 hours, and then washing with deionized water until the raw material is neutral; alkali washing treatment: dipping the raw material subjected to acid washing and drying in a potassium hydroxide solution with the concentration of 0.2-0.6 mol / L, stirring and dipping at 40-60 DEG C for 2-4 hours, and washing with deionized water again until the raw material is neutral; pyrolyzing and purifying; physical screening; and chemical activation. Compared with the prior art, the invention has the advantages of optimized graded pore structure, high purity, low ash content, improved process stability, energy saving, consumption reduction and environmental protection.

The invention relates to the technical field of vacuum, in particular to a TiZrVAl alloy getter, a preparation method and a vacuum tube. The TiZrVAl alloy getter element provided by the invention is an integrally formed part prepared from the following metal powder in atomic percent: 25 to 35 percent of Ti, 25 to 35 percent of Zr, 25 to 35 percent of V and 10 to 25 percent of Al, and the total atomic percent is 100 percent; a porous air suction structure is arranged on the surface of the TiZrVAl alloy getter element. The getter element with the specific porous structure is prepared by introducing the Al element into the TiZrV alloy and combining the 3D printing technology, the activation temperature of the getter is remarkably reduced, meanwhile, the pumping speed and the suction capacity are greatly improved, and the service life is greatly prolonged.