7 results about "Mercury oxidation" patented technology

The invention relates to the field of spectral absorption analysis, and provides an analysis method for determining mercury in basic cupric carbonate through hydrochloric acid dissolution, which comprises the following steps: dissolving basic cupric carbonate at low temperature by using hydrochloric acid without reducibility, steaming to 2-3mL, oxidizing mercury in a sample into high-valence mercury by using potassium permanganate, and determining the mercury content in the sample by using hydrochloric acid without reducibility. And completely reducing mercury in the sample into mercury vapor by using stannous chloride, and measuring the mercury content on a cold atomic absorption spectrometer. At present, a standard analysis method for mercury elements in materials such as basic cupric carbonate is lacked in China. Mercury is a harmful substance in the nature, and it is particularly important to analyze whether mercury can be accurately analyzed. The method is improved on the basis of a conventional analysis processing method, adopts single hydrochloric acid to dissolve the sample, and has the characteristics of high measurement precision, wide range, high accuracy, strong practicability and the like.

The present application belongs to the field of environmental protection, and particularly relates to a regeneration method for improving the synergistic mercury oxidation performance of a vanadium-poisoned catalyst. The present application provides a method for removing the vanadium-poisoned catalyst in two steps in the regeneration process. Vanadium crystallization is extracted by oxalic acid, and the catalyst is activated by a process in combination with sulfuric acid. On this basis, the loading of molybdenum and cerium is realized by a one-step method, which increases the mercury oxidation performance. Moreover, the oxalic acid extract can be reused, and the vanadium element is recycled in the whole process through the action of sulfuric acid, which has the characteristics of green chemistry.

The present invention provides a hollow nanotubular catalyst and its preparation method and application, which belong to the field of flue gas treatment technology. The catalyst has a uniform hollow nanotube structure with an outer diameter of about 9.0-10.0nm and an inner diameter of about 4.0-4.5nm. The active metal is dispersed on the hollow nanotube in an amorphous structure. The preparation method is to use Co-Mn / TiO2 as a precursor, mix it evenly with hexadecyltrimethylammonium bromide and an alkaline solution, and place it in a homogeneous reactor for hydrothermal treatment. The sample is collected by centrifugation, washed with deionized water, dilute nitric acid and ethanol to neutrality, dried, and calcined. The catalyst is applied to the field of synergistic denitrification and mercury removal, thereby improving the denitrification performance of the catalyst while having a high synergistic mercury oxidation removal performance, and has the potential for industrial application.

The application discloses a chemical looping combustion mercury removal system and method based on oxygen carrier oxygen-chlorine double circulation. The system comprises an air reactor, a fuel reactor, a chlorine in-situ modification chamber, a separator, a dechlorination chamber, a condenser, a conventional pollutant removal device, a carbon capture and storage device and an oxygen carrier passage. The important position of chlorine in the mercury oxidation reaction is coupled with the synergistic mercury removal effect of the oxygen carrier, greatly improving the oxidation efficiency of elemental mercury in the chemical looping combustion flue gas. The chlorine is used to modify the copper-containing oxygen carrier, an oxygen-chlorine double circulation is constructed in the oxygen carrier, and the oxygen carrier simultaneously realizes the transmission of oxygen and chlorine. The chlorine component is introduced from the chlorine in-situ modification chamber, avoiding the corrosion of chlorine to the heat receiving surface after the fuel reactor. The excess chlorine is absorbed by the dechlorination agent in the dechlorination chamber, meeting the environmental protection requirements. The application realizes deep mercury removal in the chemical looping combustion system, guarantees the safety of the system operation, and has significant environmental and social benefits.

The application discloses a praseodymium-copper heterogeneous catalyst for efficiently electro-reducing carbon dioxide to synthesize a multi-carbon alcohol product and a preparation method thereof. The praseodymium-copper heterogeneous catalyst is a composite material of praseodymium oxide and copper oxide, wherein praseodymium, copper and oxygen are uniformly distributed in the praseodymium-copper heterogeneous catalyst; the praseodymium oxide is an oxide with a praseodymium-oxygen molar ratio of 6:11; and the molar ratio of praseodymium to copper is not less than 2. The application provides a method for electro-catalytically reducing carbon dioxide to prepare a multi-carbon alcohol product, which comprises the following steps: taking a mercury / mercury oxide electrode as a reference electrode, taking a nickel foam electrode as a counter electrode, taking the praseodymium-copper heterogeneous catalyst as a working electrode, and performing electrochemical reduction in a gas diffusion type flow electrolytic cell to obtain the multi-carbon alcohol product. The praseodymium-copper heterogeneous catalyst material is designed, the interaction relationship between metals and carriers and between the metal-carrier and reaction intermediates in the catalyst is adjusted by introducing the rare earth element praseodymium, so that the reaction activity and the selectivity of the target product are improved.

The invention belongs to the field of metallurgy, and particularly relates to a method for recovering selenium and mercury from a lead filter cake, which comprises the following steps: (1) leaching; (2) selenium reduction; (3) neutralizing; and (4) mercury precipitation. Hg in the lead filter cake is mainly Hg (metallic mercury), HgS (cinnabar), HgSe (mercury selenide) and HgCl (mercuric chloride), and Se is mainly Se (elemental selenium), SeO (selenium dioxide), PbSe (lead selenide) and CuSe (copper selenide), the scheme comprises the following steps: extracting selenium and mercury in the lead filter cake by adopting a leaching system consisting of hydrochloric acid and hydrogen peroxide, oxidizing and dissolving out selenium and mercury in the lead filter cake by utilizing the strong oxidizing property of Cl2 generated by hydrogen peroxide and HCl, and separating the selenium and mercury from the lead filter cake. And the leaching rates of selenium and mercury are greatly improved.