7results about How to "High metal utilization" patented technology

The invention discloses a catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysis. The preparation method of the catalyst comprises the following steps: mixing and stirring melamine, a metal salt and a solvent under a carbon dioxide-containing atmosphere condition for prepolymerization to obtain a suspension A, reacting the suspension A at a certain temperature to obtain a solid product, washing and drying the obtained solid product to obtain a mixture B, and calcining and annealing the mixture B to obtain the catalyst. The catalyst is obtained. The catalyst has the advantages of high catalytic activity, high PO selectivity, high generation rate and the like in a reaction for preparing epoxypropane by catalyzing a propylene gas phase direct epoxidation reaction.

The utility model relates to metal casting technical field, and disclose a kind of low-pressure casting mould of adjustable casting cavity, including top die, bottom die, side mould, top rod, top rod plate, connecting plate, pull rod, the top die includes top die body, top die core, slider, inclined guide pillar, stop block, spring, the top die body is fixedly connected with stop block by bolt, and slidingly connected between slider, the top die core is fixedly connected with shunt cone, top die core and slider can be relatively moved between.The inclined guide pillar is fixed on connecting plate, connecting plate fixed pull rod, pull rod top end sets drive mechanism, for the lifting of inclined guide pillar, the slider corresponding inclined guide pillar direction sets a from top to bottom inclined through-hole, when inclined guide pillar moves downward, it can be inserted into the inclined through-hole of slider, slider is driven to move in direction away from top die core.This structure mould structure when switching size offset product does not need to add additional top die core, and can easily realize the change type work on die-casting machine platform, i.e. simple structure, convenient operation, improve metal utilization rate can also save time and increase production efficiency, save production cost.

This invention focuses on the application of a PtZn / Al2O3 bimetallic catalyst in the propane dehydrogenation reaction. A uniquely structured mixed oxide support was synthesized through a co-precipitation strategy incorporating an appropriate amount of silicon (Si), and metallic Pt was loaded using an equal-volume impregnation method. Benefiting from the uniform dispersion of Zn, Pt is atomically dispersed on the surface of Zn nanoclusters, improving metal utilization and catalytic efficiency. The introduction of Si significantly optimizes the metal-support interaction, greatly enhancing the catalyst's activity and stability. With catalyst particles of 20-40 mesh, it exhibits excellent catalytic performance, along with good high-temperature stability and resistance to carbon deposition. This preparation process is simple, reproducible, and achieves efficient and highly selective propylene production with low amounts of precious metals, demonstrating promising industrial application prospects.

This invention relates to the field of hydrocracking catalysts, and discloses a hydrocracking catalyst, its preparation method and application, and a method for hydrocracking treatment of residue oil. The hydrocracking catalyst contains molecular sieves, silicon-modified alumina, and active metal components. Optionally, the hydrocracking catalyst also contains alumina and / or additives. The content of the molecular sieve is 5-25 wt%, the content of the silicon-modified alumina is 30-60 wt%, and the content of the alumina is 0-20 wt%. The content of the active metal components, calculated as oxides, is 5-35 wt%, and the content of the additives, calculated as oxides, is 0-1.0 wt%. The catalyst provided by this invention has the advantages of large specific surface area, large pore volume, large pore size, and high metal content. When used in the hydrocracking treatment of residue oil, it not only exhibits high activity and good stability, but also improves naphtha selectivity, expands feedstock adaptability, and reduces hydrogen consumption.

The invention provides a selective hydrogenation catalyst as well as a preparation method and application thereof. Alkyne in C4 fractions can be converted into butadiene through selective hydrogenation. The catalyst comprises a main active component, an optional auxiliary active component and a carrier. By regulating and controlling the type, number and density of oxygen-containing groups of the carrier, the distribution of metal active components is controlled, the metal utilization rate is increased, and better butadiene selectivity is obtained.

The present invention relates to the technical field of brake disc preparation, and in particular provides a method for preparing a high thermal conductivity brake disc; for the high thermal conductivity brake disc prepared by the present invention, copper plating on the surface of silicon dioxide can effectively reduce the pores at the interface between SiO2 particles and a copper matrix, and improve the interface bonding state between the silicon dioxide and the copper matrix; copper plating on the surface of SiO2 particles can further improve the hardness and tensile strength of the composite material, and has good mechanical properties; the high thermal conductivity brake disc prepared by the present invention has a thermal conductivity of up to 143W / (m·K) at 300°C, greatly improved thermal conductivity, and has significantly high thermal conductivity; the high thermal conductivity brake disc prepared by the present invention has a high metal utilization rate, a short manufacturing cycle, and a low production cost.

The present application relates to a closed-loop stent, which is formed by a plurality of longitudinally extending repeating units connected circumferentially, wherein the repeating units are composed of two corrugated structures and a connecting unit arranged between the two corrugated structures, and adjacent repeating units share a corrugated structure, and the two corrugated structures are respectively a first corrugated structure and a second corrugated structure, and the connecting unit is composed of a plurality of first L-shaped struts, a plurality of second L-shaped struts and a plurality of S-shaped struts, wherein one end of the first L-shaped strut is connected to the first corrugated structure, and the other end of the first L-shaped strut is connected to the S-shaped strut, one end of the second L-shaped strut is connected to the second corrugated structure, and the other end of the second L-shaped strut is connected to the S-shaped strut, and the first L-shaped strut, the second L-shaped strut and the two adjacent S-shaped struts form an eye-shaped structure, and the stent has the advantages of high metal utilization rate and low cost in the manufacturing process, adjustable axial stiffness of the stent, and small diameter after crimping.