6 results about "Platinum nanoclusters" patented technology

This invention relates to rare-earth single-atom doped alumina-supported platinum cluster catalysts, their preparation methods, and applications. The catalyst comprises a catalyst support and platinum nanoclusters dispersed on the catalyst support. The catalyst support is an alumina support doped with rare-earth elements in single-atom form. The preparation method includes the following steps: Step 1: preparing a rare-earth-aluminum composite metal oxide precursor; Step 2: preparing a catalyst support; Step 3: loading platinum onto the catalyst support; Step 4: activating the platinum-supported catalyst support. The catalyst is applied in the dehydrogenation reaction of cycloalkane. This invention, by precisely doping rare-earth elements into the alumina lattice in single-atom form, constructs stable rare-earth-oxygen active sites within the lattice, significantly promoting the migration and diffusion of hydrogen atoms from the platinum clusters to the support surface, thereby greatly enhancing the hydrogen spillover effect, improving the utilization efficiency of active hydrogen, and achieving precise control over complex reaction pathways.

The application belongs to the technical field of food detection, and particularly relates to a gas-sensitive composite material for detecting triethylamine, a preparation method, a gas sensor and application. The unique composite structure of the porous zinc oxide carrier and the ultrafine platinum nanocluster is constructed, and the synergistic effect of the two is utilized, so that the adsorption, catalysis and electronic modulation performance for triethylamine gas are significantly improved. The gas sensor has the characteristics of high sensitivity with a detection range of 0.1ppm-50ppm, a low detection limit of 37.5ppb, excellent selectivity and rapid response, and is particularly suitable for fields such as food freshness monitoring.

The application discloses a kind of platinum supported cerium-based nanoscale enzyme and its preparation and application, the nanoscale enzyme includes cerium oxide nanorod carrier and the Pt active component loaded on its surface, the Pt active component is dispersed in the form of single atom or nanocluster on the surface of cerium oxide nanorod, the surface of cerium oxide nanorod has oxygen defect, by first loading platinum monolayer on the surface of cerium dioxide nanorod, then by reduction treatment, platinum atom forms platinum nanocluster on the surface of cerium dioxide and obtains.The nanoscale enzyme of the application effectively adjusts the oxygen vacancy and Pt site on the surface of cerium dioxide, has good peroxidase-like characteristics, can be used to construct TMB colorimetric system for colorimetric analysis of thiol reducing substances, and further used for disease screening, significantly improves the distinguishing effect.

This invention relates to a fluorine and chlorine co-doped carbon nanosheet-supported platinum nanoclusters hydrogen evolution catalyst and its preparation method. The catalyst consists of a fluorine / chlorine co-doped two-dimensional carbon nanosupport, platinum nanoclusters supported on its surface, and nitrogen-containing organic ligands. The preparation process includes: using an alkali metal chloride as a template and a chlorine source, and a fluorine-containing polymer as a carbon-fluorine dual source, a layered carbon support is obtained through high-temperature calcination, grinding, and washing; platinum nanoclusters are loaded into a composite structure using a wet chemical method; and nitrogen-containing organic ligands are introduced into an acidic electrolyte to achieve in-situ surface modification. The core innovation of this invention lies in optimizing the hydrogen adsorption energy of the platinum clusters through electronic regulation of the support, while simultaneously utilizing organic ligands to reconstruct the interfacial hydrogen bond network, synergistically improving proton transfer efficiency and electrochemical stability. The resulting catalyst can be directly used as the cathode of a proton exchange membrane electrolyzer, exhibiting a significantly reduced hydrogen evolution overpotential and excellent long-term stability in an acidic environment. It also avoids the use of binders and significantly improves the utilization rate of noble metal atoms, effectively reducing the cost of platinum-based hydrogen production catalysts.

This invention discloses a method for synthesizing platinum nanoclusters (ZIF-8@PtNCs) based on ZIF-8 encapsulation, and its application in the quantitative detection of doxycycline hydrochloride (Dox). Using acidic medium bleaching blue B as a stabilizer, potassium hexachloroplatinate as a raw material, and sodium borohydride as a reducing agent, a fluorescent platinum nanoclusters (PtNCs) are obtained after a mixed reaction. Then, ZIF-8 is synthesized in the PtNCs solution, allowing PtNCs to assemble onto ZIF-8, forming ZIF-8@PtNCs. The synthesized ZIF-8@PtNCs have a maximum excitation wavelength of 323.0 nm and a maximum emission wavelength of 450.0 nm. The fluorescence intensity and fluorescence stability of the prepared ZIF-8@PtNCs are improved compared to traditional PtNCs. The fluorescence intensity of ZIF-8@PtNCs is quenched upon the addition of Dox. Based on the linear relationship between the fluorescence intensity quenching value of ZIF-8@PtNCs and the Dox concentration, the Dox content can be detected. The method for synthesizing ZIF-8@PtNCs in this invention is simple and easy to achieve on a large scale. Its application in the detection of Dox is simple and low-cost, and it has potential application value in the detection of Dox content in water samples.