5results about How to "Reduce active sites" patented technology

The application belongs to the chemical field and provides a preparation method of a catalyst for methane dry reforming; a 3D-Ti-Ce-O carrier is prepared, and Ni, Fe and Nb active metals are loaded on the 3D-Ti-Ce-O carrier to obtain a Ni-Fe-Nb / 3D-Ti-Ce-O catalyst. The application also simultaneously provides a methane dry reforming reaction; CH4 and CO2 are mixed according to a volume ratio of 1:1 and input into the inner cavity of a quartz tube as raw gas from a gas outlet, and then the raw gas is contacted with the catalyst and reacts under the action of plasma discharge to generate CO and H2. The Ni-Fe-Nb / 3D-Ti-Ce-O catalyst provided by the application has high methane and carbon dioxide conversion rate and long-term stability in DBD.

The application discloses a supported catalyst and a preparation method and application thereof, and the raw material of the supported catalyst comprises a ruthenium carbene complex, alkyl aluminum and / or alkyl aluminum oxide, a phosphine-based siloxane compound and a silicon-aluminum type mesoporous molecular sieve; wherein the silicon-aluminum type mesoporous molecular sieve has a silicon-aluminum molar ratio of 25-30, a specific surface area of 550-850 m 2 / g, a relative crystallinity of 90-95%, a pore size of 2.5-3.5 nm and a pore volume of 0.80-1.0 cm 3 / g. The active sites of the supported catalyst are fully exposed, the loading amount of the ruthenium carbene complex is high, the metal ruthenium is not easy to fall off, and the preparation process is simple, so that the supported catalyst can effectively initiate a 1-hexene metathesis reaction.

This invention discloses the use of a class of polysubstituted cyclic ether compounds as solvents for lithium-ion battery electrolytes. The polysubstituted cyclic ether compounds are alkyl-substituted cyclic ether solvents. These polysubstituted cyclic ether solvents have lower dielectric constants and lower ion desolvation energies, and exhibit good stability with lithium metal / graphite anodes. More importantly, these polysubstituted cyclic ether compounds have no special restrictions on the type of lithium salt. Using these polysubstituted cyclic ether compounds can significantly improve the low-temperature performance of batteries, thus broadening their applicability.

The invention provides a preparation method of nano cobalt hydroxide, belongs to the technical field of preparation of lithium ion battery materials, and solves the problems that an existing nano cobalt hydroxide preparation process is complex, high in requirements for production equipment and unfavorable for large-scale product.The preparation method comprises the steps that a solution A and a solution B are prepared according to three conditions, and a synthetic reaction and aging are conducted after preparation; after aging is finished, washing the prepared cobalt hydroxide slurry; the washed cobalt hydroxide material is dried; and crushing the dried cobalt hydroxide to obtain a nanoscale cobalt hydroxide product. The prepared nanoscale cobalt hydroxide is small in specific surface area, does not need to add a dispersing agent, is simple in raw material and process, is easy to wash, and is easy for industrial production.

This invention relates to a nitrogen-phosphorus co-doped composite carbon nanotube catalyst, its in-situ growth preparation method, and its application. The in-situ growth preparation method includes the following steps: immersing a conductive nickel-containing substrate with a three-dimensional porous structure in a precursor solution containing both nitrogen and phosphorus elements; removing and drying the substrate; and then subjecting it to a calcination reaction in a flame under a combustible atmosphere. This causes the precursor to burn and decompose on the substrate surface, resulting in an in-situ reaction and growth of a three-dimensional network structure of nitrogen- and phosphorus-doped carbon nanotubes embedded with nickel nanoparticles. After cooling, the nitrogen-phosphorus co-doped composite carbon nanotube catalyst is obtained supported on the substrate. Compared with existing technologies, this invention enables the one-step, rapid, and inexpensive preparation of a non-precious metal catalyst with a highly conductive network, abundant active sites, and excellent stability on a conductive substrate, which can be directly used for efficient water electrolysis to produce hydrogen, thereby promoting its large-scale industrial application.