A kind of iron source sapo-34 catalyst with low temperature scr activity and its preparation method and application

Abstract

The invention relates to an iron source SAPO‑34 catalyst with low-temperature SCR activity, a preparation method and application thereof, and belongs to the technical field of SCR catalyst preparation. A kind of iron source SAPO-34 catalyst with low-temperature SCR activity, its preparation raw material comprises pseudo-boehmite, orthophosphoric acid, water, silica sol, iron source and tetraethylenepentamine; Each raw material is calculated according to active ingredient, AlOOH, H ₃ PO ₄ 、H ₂ O, SiO ₂ , Fe and tetraethylenepentamine molar ratio is 1: (0.55 ~ 0.65): (35 ~ 45): (0.2 ~ 0.4): (0.05 ~ 0.15): (0.1 ~ 0.4). The present invention also provides the above-mentioned catalyst doped with a small amount of copper, Cu-doped Cu _0.01 Fe _0.1 The iron source precursor of the SAPO‑34 catalyst is ferrous acetate, the copper source precursor is copper acetate, and the NOx conversion rate can reach 82% at 200 °C. Cu _0.01 Fe _0.1 SAPO‑34 catalyst has broad application prospects in the field of stationary source low temperature flue gas denitrification.

Description

technical field [0001] The invention belongs to the technical field of SCR catalyst preparation, and in particular relates to an iron source SAPO-34 catalyst with low-temperature SCR activity and its preparation method and application. Background technique [0002] Nitrogen oxides (NO x ) is an important precursor of smog and ozone pollution. At present, ozone pollution has become one of the primary pollutants in the ambient air in many areas of our country, and effective control measures have not yet been established. The academic community generally agrees that to control or reduce ozone pollution and atmospheric oxidation in the atmosphere, it is necessary to effectively control NO x emissions. According to statistics, man-made NO emissions x Mainly from the two major sectors of industry and transportation, the stationary source NO represented by coal-fired flue gas x Emissions accounted for NO x a larger share of total emissions, thus controlling stationary source ...

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Problems solved by technology

Among them, the catalyst with Fe as the main active component has received extensive attention due to its good anti-sulfur effect and wide temperature window. Andonova et al. prepared Fe-SAPO-34 molecular sieve catalyst by one-pot method (see ANDONOVA S, TAMM S,MONTREUIL C,et al.The effect of iron loading and hydrothermal aging on one-pot synthesized Fe / SAPO-34for ammonia SCR[J].Applied Catalysis BEnvironmental,2016,180:775-787.), but the catalyst is only available in It shows good SCR activity in the middle temperature range, and the influence of different iron precursors on the synthesis of Fe-SAPO-34 molecular sieve and the low-temperature denitrification performance has not been explored in depth.

In addition, there is no literature report on the effect of Cu doping on the controllable synthesis and low-temperature SCR activity of FeSAPO-34

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