9results 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 invention discloses a preparation method of a polymer / Ti3C2-CeO2 composite scaffold with an anti-tumor function. Comprising the following steps: loading CeO2 by utilizing Ti3C2, synthesizing Ti3C2-CeO2 powder by a hydrothermal synthesis method, grinding and uniformly mixing degradable high-molecular polymer poly-L-lactic acid (PLLA) powder with the mass percent of 95% and Ti3C2-CeO2 powder with the mass percent of 5%, and preparing the PLLA / Ti3C2-CeO2 composite scaffold by utilizing a selective laser sintering technology. The prepared PLLA / Ti3C2-CeO2 composite scaffold is used as an artificial implant material for treating bone tumor diseases, and the problem that the curative effect based on reactive oxygen species (ROS) therapy is limited due to oxygen deficit and glutathione overexpression in a tumor microenvironment is solved. CeO2 relieves oxygen deficit, promotes the photodynamic process and generates hydroxyl radicals to amplify oxidative stress, and over-expressed glutathione can be consumed through the oxidation-reduction reaction of CeO2. In addition, the photothermal effect of Ti3C2 enhances the enzymatic activity of CeO2 in turn. The antitumor efficiency of the composite scaffold can be effectively improved by combining the dual enzyme activity, the photothermal effect and the photodynamic effect.

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.

The invention provides a zero discharge method of electroplating alkaline wastewater, which comprises the following steps: preliminarily filtering the alkaline wastewater generated by electroplating by using a screen, and adding an acidic solution to adjust the pH value of the wastewater to 7-8; adding a flocculating agent which accounts for 3-5% of the mass of the wastewater, then stirring at the stirring speed of 150-250r / min for 20-30 minutes, and then introducing the wastewater into a sedimentation tank for sedimentation for 2-2.4 hours; then filtering through an ultrafiltration device and a nanofiltration device; feeding the filtered wastewater into an MVR (mechanical vapor recompression) evaporator for evaporative crystallization treatment, discharging crystalline salt in a crystallizer through a scraper conveyor, and condensing at the temperature of 40-50 DEG C to realize zero discharge of the wastewater. According to the zero discharge method for the electroplating alkaline wastewater, harmful substances in the electroplating alkaline wastewater are efficiently separated and converted, and finally zero discharge of the wastewater is achieved.

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.

The present invention provides a composite lithium iron phosphate positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing lithium ferrite powder and ferrous phosphide and performing a primary granulation treatment to obtain first particles, and performing a one-step roasting treatment to obtain a precursor A; (2) mixing lithium ferrite powder and a carbon source and performing a secondary granulation treatment to obtain second particles, and performing a two-step roasting treatment to obtain a precursor B; (3) compounding the precursor A and the precursor B, adding a carbon source, and performing a calcination treatment to obtain the composite lithium iron phosphate positive electrode material. The lithium iron phosphate positive electrode material of the present invention has a high compaction density of the pole piece, excellent rate performance under low temperature conditions, effectively improving the LFP capacity while improving the material stability, and the preparation method is simple in process, low in production cost, energy-saving and high-efficiency, and suitable for industrial production.

The present application provides a MXene aerogel for hydrogen storage and a preparation method thereof, the method comprising: S01, adding LiF solution to MXene n+1 AX n The method comprises the following steps: step S02, dispersing the MXene material in water to obtain a MXene aqueous dispersion; adding a crosslinking agent to the MXene aqueous dispersion, stirring the dispersion evenly after ultrasonic treatment, and concentrating the dispersion to obtain ink; step S03, 3D printing the ink to obtain a MXene composite hydrogel; pretreating the MXene composite hydrogel to obtain a MXene composite aerogel; and heat-treating the MXene composite aerogel under an inert gas atmosphere to obtain a MXene aerogel having the advantages of high specific surface area and large hydrogen storage capacity.