Other transitional metals doped ferrotitanium composite oxides catalyst for selectively reducing nitrous oxides by ammonia
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A technology of composite oxides and transition metals, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical/physical processes, etc. Low selectivity, high operating temperature, etc., to achieve the effect of no obvious poisoning effect, simple preparation process and high activity
Inactive Publication Date: 2009-04-22
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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[0007] The main technical problem to be solved by the present invention is to overcome the currently commonly used NH 3 -SCR vanadium-based catalyst system has high operating temperature and narrow temperature window, and N at high temperature 2 Due to the defects of low selectivity, potential hazards to the ecological environment and human health, and poor low-temperature activity of the iron-titanium composite oxide catalyst system we developed
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[0018] [Example 1-5]
[0019] Prepare a certain concentration of Fe(NO 3 ) 3 solution, Ti(SO 4 ) 2 solution and La(NO 3 ) 3 , Ce(NO 3 ) 3 , Pr(NO 3 ) 3 , Mn(NO 3 ) 2 or In(NO 3 ) 3A solution in and mixed evenly, so that the concentration of transition metal ions accounts for 5% of the total active component ion concentration, slowly add ammonia water dropwise to the mixed solution under stirring with a magnetic stirrer, adjust the pH value to 10 to make the precipitation complete , then carry out suction filtration and washing, put the filter cake in an oven and dry overnight at 100°C, and finally roast it in the air at 400°C for 6 hours in a muffle furnace, grind and sieve the prepared catalyst, and take 20-40 mesh spare. The catalysts containing La, Ce, Pr, Mn, and In in Examples 1-5 are referred to as catalysts A, B, C, D, and E, respectively.
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[0020] [Example 6-11]
[0021] The type of fixed transition metal ions is Mn, and the molar concentration ratio of Mn in the total active component ions is changed to be controlled at 0, 15, 25, 50, 80, 100% respectively, and the rest of the preparation conditions are completely the same as in Examples 1-5. Similarly, the catalysts prepared in Examples 6-11 are respectively referred to as catalysts F, G, H, I, J, and K.
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[0022] [Example 12]
[0023] With the iron-titanium composite oxide catalyst (doping amount is 5%) that other transition metals doping that embodiment 1-5 makes, carry out NH on the self-made miniature fixed-bed reactor 3 Investigation of the Reactivity of Selective Catalytic Reduction of NO. The consumption of catalyst is 0.6ml, and the composition of reaction gas mixture is: [NO]=[NH 3 ]=500ppm, [O 2 ] = 5%, N 2 As a balance gas, the gas space velocity is 50,000h -1 , The reaction temperature is 150-350°C. The reaction results are shown in Table 1.
[0024] Table 1 Activity evaluation results of catalysts doped with different transition metals
[0025]
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Abstract
The invention relates to a catalyst for selectively deoxidizing oxides through ammonia, which mainly solves the problems that in the prior commercial NH3-SCR catalyst system, V2O5-WO3(MoO3)/TiO2 has high operating temperature and a narrow temperature window, N2 has low generation selectivity at high temperature, vanadium as an active composition has toxicity and harmfulness on environment and human body and the like. On the basis of a ferrotitanium composite oxide catalyst prepared in prior period, environment-friendly raw materials with cheap prices are continuously adopted; and other transition metal oxides are added into a ferrotitanium composite oxide catalyst system through a simple and feasible coprecipitation method to prepare a catalyst system with improved low-temperature activity. The catalyst is subjected to physicochemical property characterization by using a plurality of methods to show that an active phase of the catalyst is the same as that of a ferrotitanium composite oxide catalyst which is not doped with other transition metals, and is still in a microcrystal state, thereby forming a composite oxide microcrystal system with a Fe-O-Ti, M-O-Ti and Fe-O-M (M is a doped transition metal element) structure; and the composite oxide microcrystal system has special catalytic activity in SCR reaction. The catalyst has high NH3-SCR activity, selectivity and stability at a middle-low temperature period (between 150 and 300 DEG C), is unobvious in the poisoning effect of SO2; and if the catalyst is prepared into slurry and is coated on a honeycomb ceramic carrier, the catalyst is expected to be applied to the denitration and purification process of flue gas produced after desulfuration and dedusting in a coal-fired power plant or tail gas of a diesel engine.
Description
technical field [0001] The invention is applied in the technical field of environmental catalytic purification, and relates to an ammonia selective nitrogen oxide reduction catalyst for the purpose of denitration of coal-fired flue gas or diesel engine tail gas. Background technique [0002] With the advancement of science and technology and the improvement of people's living standards, the protection of the atmospheric environment has become a very important issue. Nitrogen oxides (NO x ) is a major pollutant in air pollution. In terms of man-made sources, it is mainly divided into stationary sources including coal-fired power plant flue gas and mobile sources including diesel engine exhaust. NO x The existence of NO will cause major environmental problems such as photochemical smog and acid rain, and at the same time have serious harm to the respiratory organs of the human body. Therefore, how to effectively remove NO x It has become a key topic of environmental protect...
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IPC IPC(8): B01J23/83B01J23/825B01D53/56
Inventor 贺泓刘福东丁云张长斌
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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