2 results about "Palladium nitrate" patented technology

This invention belongs to the field of hydrogenation catalyst technology, specifically relating to a Pd-Cu bimetallic catalyst, its preparation method, and its application. Using palladium nitrate and copper nitrate as metal sources, 2-methylimidazole as an organic ligand, and SiO2 as a support, a metal-organic framework precursor is constructed via a solvothermal method. This precursor is then subjected to a two-step heat treatment process: N2 atmosphere pyrolysis and air atmosphere calcination, yielding a PdxCu@SiO2 catalyst with an adjustable Pd / Cu molar ratio. The Cu loading is 4.0 wt.%, and the Pd loading is 0.5~5.5 wt.%. This invention features a mild and easily controllable process, allowing for precise optimization of the catalyst's active site structure. The SiO2 support effectively improves the catalyst's dispersibility and stability. The resulting catalyst exhibits excellent performance in CO2 hydrogenation to methanol, with a maximum CO2 conversion rate of 16.3%, a methanol selectivity of 64.5%, and a space-time yield approximately 18.5 times higher than that of the traditional impregnation method, while also demonstrating excellent long-term operational stability.

The application relates to the field of biological monitoring and particularly belongs to a detection method of chlorogenic acid and application thereof. The method comprises the following steps: taking palladium nitrate, iron nitrate nonahydrate and glutathione as raw materials to prepare FePd2S4 nano-enzyme particles; mixing different concentrations of chlorogenic acid standard solution with acetic acid-sodium acetate buffer solution, H2O2, 3,3',5,5'-tetramethylbenzidine and FePd2S4 nano-enzyme suspension, incubating, measuring the absorbance value at 652 nm, taking the concentration of chlorogenic acid as the abscissa and the absorbance difference as the ordinate, drawing a standard curve and obtaining a linear equation; processing a sample to be measured, extracting chlorogenic acid in the sample to be measured, and preparing a sample solution; taking the sample solution to replace the chlorogenic acid standard solution to repeat the above steps and measure the absorbance value; and calculating the content of chlorogenic acid in the sample to be measured according to the linear equation of S.2. The method has the advantages of simplicity, low cost, high stability, environmental friendliness and the like and is suitable for large-scale preparation.