54results about How to "Strong resistance to sulfur poisoning" patented technology

The invention discloses a copper-based composite catalyst for gas-state zero valent mercury oxidation in the field of smoke control and a preparation method and the purpose thereof. The copper-based catalyst is a copper-based composite oxide catalyst and/or a copper-based composite halide catalyst. The catalyst can utilize oxygen and trace HCI existing in smoke to achieve high efficiency conversion of zero valent mercury (HgO) and divalent mercury (Hg2+) under low temperature in a wider temperature range (500-300 DEG C) and can even achieve high efficiency oxidation of simple substance mercury in smoke free of HCI. The catalyst is suitable for catalytic oxidation of mercury in fire coal smoke, and the product Hg2+ of oxidation can be easily dissolved in water and can be removed by other pollutant control devices. The catalyst is simple in preparation method, wide in suitable temperature range, high in oxidation efficiency, weak in dependency on CI in the smoke, good in stability and high in SO2 poisoning resistance and has good application prospects and economical benefits in the fire coal smoke mercury discharge control fields including power station boilers, industrial boilers, industrial kilns and the like.

The invention discloses a supported SCR denitration catalyst of medium and low temperature flue gas and a preparation method and application thereof. The catalyst comprises the following components: vanadium element, transition metal M and carrier. The addition of the vanadium element is 0.5-4wt% of the total mass of the catalyst by weight percent via calculating the amount of V2O5; the addition of the transition metal M is 1-14wt% of the total mass of the catalyst by weight percent via calculating the total amount of oxide; and the addition of the carrier is 80-98.5wt% of the total mass of the catalyst by weight percent. Compared with the widely used commercial catalyst, the catalyst of the invention reduces the cost by more than 30%, broadens the medium and low temperature ranges of SCR catalyst activity, and has the characteristics of simple preparation, low cost, high activity, strong sulfur poisoning resistance and the like.

The invention discloses an iron-manganese compound oxide catalyst for selectively catalyzing and reducing nitric oxides in flue gas at a low temperature and a preparation method thereof and application thereof. The catalyst comprises active components such as iron element, manganese element, auxiliary agent element and the like. The method for preparing the catalyst comprises the following steps: 1, the iron salt and the manganese salt are mixed, and added with nitrate or acetate of the auxiliary agent element to obtain a mixed metal salt; 2, a solution of citric acid is added in the mixed metal salt and evenly mixed by stirring; 3, at the constant temperature of between 40 and 160 DEG C, the mixed solution is dried to give a solid; 4, the solid is calcined in the air for 1 to 8 hours, the calcination temperature is between 200 and 900 DEG C, and a mixed oxide is obtained; and 5, the mixed oxide is ground, tabletted and screened to obtain the finished product of the catalyst. The catalyst can selectively catalyze and reduce nitric oxides in the flue gas at a low temperature under the aerobic condition, so that the catalyst has the characteristics of high activity, high selectivity and high stability.

A process for preparing the catalyst containing the S and the atom cluster compound of transition metal (Mo or W) and used for hydrodesulfurizing is disclosed. Said atom cluster compound of Mo or W is prepared from its oxide through electrolyzing in acid solution, sulfurizing, oxidizing, concentrating, separation and chemical reaction. Its advantage is high hydrodesulfurizing performance.

The invention relates to a composite metal sulfate system flue-gas-denitration catalyst and a preparation method thereof, and belongs to the technical fields of environmental-friendly catalytic materials and atmospheric pollution control. The catalyst and the preparation method thereof are characterized in that titanium dioxide is used as a carrier, ceric sulfate is used as an active component, and a transition-metal sulfate is used as a cocatalyst; the weight percent of the active component of the catalyst is 1-25% based on the weight of the carrier; and the weight ratio of the active component to the auxiliary is 1: (0.1-0.9). The catalyst is prepared by utilization of a direct sulfate-dipping method. Compared with technical performances of selective catalytic reduction (SCR) denitration catalysts at present, the catalyst provided by the invention broadens the middle/high-temperature denitration active temperature window, and enhances vapor-poison tolerance and sulfur dioxide poison tolerance of the catalyst significantly. The preparation technology of the catalyst is simple, environmental friendly, cheap, and free of secondary pollution.

The invention belongs to the field of environmental protection technology and denitration catalysis, and particularly relates to a reutilization method of an inactivated SCR denitration catalyst. Thereutilization method specifically comprises the following steps: soot blowing, cleaning by a cleanout fluid, reductive acid leaching, auxiliary agent loading, active component loading and the like. Bytaking the integral inactivated SCR denitration catalyst as a raw material, the low-temperature SCR denitration catalyst is obtained by carrying out in situ regeneration. The regeneration catalyst has very high catalytic activity and sulfur poisoning resistance in a temperature range of 150-300 DEG C.

The invention discloses a preparation method of a catalyst for the one-step preparation of p-aminophenol from nitrobenzene. The method comprises the following steps: preprocessing active carbon; loading a platinum salt; loading a vanadate; and reducing a catalyst, wherein the mass percentage contents of platinum and vanadium in the catalyst are 0.5-5% and 0.05-0.2% respectively. The invention also discloses a method for the one-step preparation of p-aminophenol from nitrobenzene through utilizing the catalyst. The addition of a certain amount of metallic vanadium to the Pt/C catalyst reduces the poisoning effect of sulfides in the nitrobenzene raw material to platinum, prolongs the service life of the catalyst and also improves the catalysis activity and selectivity of the catalyst; and the prepared catalyst has stable performances and very good repeatability, can be used for catalyzing the one-step preparation of p-aminophenol from nitrobenzene, reduces the purity requirement of the raw material nitrobenzene and reduces the catalysis cost.

A catalyst for convering CO to CO2 isn environmental condition in order to clean air is composed of gold as its active component and MOx/Al2O3 as carrier, where MOx may be CoOx or FeOx, MiOx, MnOx, CuOx and ZnOx. With it the CO can be converted to CO2 at -30-50 deg.C, in ordinary ambient condition.

The gasoline oxidation reformation hydrogen manufacturing catalyst is a loaded catalyst using one of Al2O3, ZrO2, TiO2, MgO and iolite as carrier, and is characterized by that RuO2 is used as main catalytic component, its content is 0.1-0.8 wt% of total weight of said catalyst, and one or several kinds of oxides of rare earth elements, oxides of alkaline earth metals and oxides of alkali metals are used as auxiliary catalytic component, and its content is 1-10 wt% of total weight of said catalyst.

The invention discloses a heteropolyacid-containing aromatics hydrogenation catalyst and a preparation method thereof, relating to a catalyst. The invention provides the heteropolyacid-containing aromatics hydrogenation with high sulphur resistance and high activity and the preparation method thereof. The catalyst comprises caesium heteropolyacid salts, hydrogenated components and a carrier, wherein the heteropolyacid caesium salts are caesium phosphotungstate or caesium silicotungstate, and the like; the hydrogenated components comprise Ni transition metal element, and the like; the carrier is a porous heat-resisting inorganic material; and the contents of all the components of the catalyst in percentage by mass are that: 5-40 percent of heteropolyacid, 0.2-0.5 percent of caesium, 5-20 percent of hydrogenated component and the balance of carrier. The preparation method comprises the following steps of: adding an water-soluble nickel salt solution and water-soluble heteropolyacid caesium salts into the carrier and impregnating; drying solid matters obtained through liquid-solid separation, and then roasting; preparing an aqueous caesium heteropolyacid salt solution, adding the aqueous caesium heteropolyacid salt solution to the obtained solid matters; impregnating and drying; and tabletting and forming to obtain the heteropolyacid-containing aromatics hydrogenation catalyst.

The invention relates to a storage reduction catalyst used for removing nitrogen oxide in lean burn engine tail gas and a preparation method. The preparation method comprises the following steps of: with soluble cerium salt and zirconium salt as raw materials, alkali as coprecipitator and polyethylene glycol as thickening agent, preparing a cerium zirconium powder carrier according to the atom ratio of Ce to Zr of (6-8):(4-2); with soluble barium salt as a raw material, loading the barium salt onto the cerium zirconium powder carrier by adopting an isovolumetric method, wherein BaO accounts for 20-40% of the mass of the catalyst; then loading one or two precious metals of Pt and Pd accounting for 1.0-3.0% of the mass of the catalyst by adopting the isovolumetric method, thus a sample I isobtained; with Al2O3 as a carrier, loading one or two precious metals of Rh and Pd accounting for 0.5-2.0% of the mass of the catalyst by adopting the isovolumetric method, thus a sample II is obtained; and mechanically mixing the sample I and the sample II according to the mass ratio of (1-3):1, thus the nitrogen oxide storage reduction catalyst comprising 50-75% of ((Pt,Pd)/BaO/CexZr(1-x)O2) and 50-25% of ((Rh,Pd)/Al2O3) is obtained, wherein NOx conversion rate of the catalyst can reach more than 80%. After treatment in presence of high-temperature water vapour or SO2 is carried out, the nitrogen oxide storage reduction activity is maintained to be more than 80%.

The invention provides a preparation method of an anti-sulfur poisoning platinum complex. The preparation method comprises the following steps: preparing a 1,3-dithiane benzene containing derivative intermediate A, preparing an unsaturated symmetrical epithio-silane intermediate B, connecting the 1,3-dithiane benzene containing derivative intermediate A to Pt through a phase transfer substitutionbond, then firstly substituting and then chelating the unsaturated symmetrical epithio-silane intermediate B to Pt, and obtaining the anti-sulfur poisoning platinum complex. The preparation method issimple and convenient, the reaction condition is mild, the production efficiency is high, the cost is low, and the industrial production is realized. A prepared catalyst has a highly symmetric complexstructure, the anti-sulfur poisoning platinum complex is stable at the room temperature, can be stored for long and has an excellent anti-sulfur poisoning catalytic effect, the catalytic activity ismore than 92%, the curing degrees of a sulfur-containing system and a non-sulfur system are basically the same and both reach more than 90%, and the anti-sulfur poisoning platinum complex has an excellent anti-sulfur poisoning capability, and is widely applied to the hydrosilylation.

The invention discloses a VOCs (voltaic organic chemical) catalytic combustion catalyst with anti-sulfur poisoning function and a preparation method thereof. The catalyst is prepared from an active component and a TiO2 (titanium dioxide) carrier, wherein the active component is CexSbyAzO2; A is selected from at least one of Cu (copper), Co (cobalt) and Mn (manganese); x is greater than or equal to0.6, and is smaller than or equal to 1.0; y is greater than or equal to 0.2, and is smaller than or equal to 0.4; z is greater than 0, and is smaller than or equal to 1. The preparation method comprises the following steps of firstly, preparing the active component; then, preparing a catalyst additive precursor solution; mixing the active component and the catalyst additive precursor solution, drying, and calcining, so as to obtain the catalyst. The prepared VOCs catalytic combustion catalyst has the characteristics that the anti-sulfur poisoning ability is excellent, and the conversion rateof toluene can reach 94%; the cost is low, the technology is simple, the catalyst is suitable for industrialized production, and the like.

The invention discloses a non-metal doped metal oxide denitration catalyst with strong sulfur tolerance and a preparation method thereof. The denitration catalyst is mainly prepared by the following steps: using a sol-gel method to prepare a metal oxide, adding a non-metal element precursor in the gelling process, and then obtaining the non-metal doped metal oxide through high temperature calcination, and finally loading 10wt% of an active metal component on the non-metal doped metal oxide to obtain the catalyst. The catalyst provided by the invention has the advantages of excellent medium-high temperature activity, excellent cycling stability, simple preparation method, extremely strong sulfur poisoning resistance and the like, and can be used for catalytic treatment of nitrogen oxides intail gas generated by various stationary pollution sources of coal-fired power plants, waste incineration boilers, steel mills, cement plants and the like. The preparation method is simple and low-cost.

The invention discloses a platinum complex resistant to sulfur poisoning and applications thereof. The platinum complex has a complexing symmetric structure, which comprises a 1,3-dithiane benzene containing derivative group and symmetric unsaturated epithio-silane; wherein the 1,3-dithiane benzene containing derivative group comprises a benzene ring and a symmetric epithio- six-membered ring. ThePt catalyst has a highly symmetrical complexing structure and a very good effect on resisting sulfur poisoning. The catalytic activity is 92% or more. The catalytic effect in a sulfur system is basically the same as that in a non-sulfur system. The Pt catalyst has a good performing on resisting sulfur poisoning, is very stable at a room temperature, and can be stored for a long term. Solved are the problems that in the prior art, the storage time of a conventional Pt catalyst is short, the conventional Pt catalyst should be strictly sealed, and the catalytic activity of the Pt catalyst is lost after the Pt catalyst is poisoned by sulfur containing compounds. The Pt catalyst can be widely used in silicon-hydrogen addition reactions.