Preparation method of Mn-Ti oxide system low-temperature selective catalytic reduction (SCR) catalyst

Abstract

The invention discloses a preparation method of a Mn-Ti oxide system low-temperature selective catalytic reduction (SCR) catalyst. The preparation method comprises the following steps of: in a stirring condition, adding titanium tetrabutoxide in acrylic acid to uniformly mix, adding manganous nitrate and a solvent, and stirring a mixture to form a homogeneous phase solution, wherein a mol ratio of the titanium tetrabutoxide to the manganous nitrate ranges from 10: 1 to 10: 6, and a mol ratio of sum of the titanium tetrabutoxide and the manganous nitrate to the acrylic acid ranges from 1: 5 to 1: 1; deoxidizing by introducing nitrogen, and adding an initiator to polymerize, so as to obtain solid polyacrylate; and drying and carrying out pyrolysis on the solid polyacrylate, and then grinding to obtain Mn-Ti oxide powder. The preparation method provided by the invention has the advantages of easiness of control and convenience in implementation; metal ions in a prepared polymer precursor can be horizontally and uniformly mixed in an ion level; the grain size of the Mn-Ti oxide powder prepared by sintering the polymer precursor can reach a nanometer level and a narrow distribution range so that the Mn-Ti oxide system low-temperature SCR catalyst has a better application prospect in a low-temperature smoke SCR denitration reaction catalyst field.

Description

technical field [0001] The invention belongs to the field of physical chemistry, and in particular relates to a preparation method of a Mn-Ti oxide system low-temperature selective catalytic reduction catalyst. Background technique [0002] Stationary sources of nitrogen oxides (NO x ) treatment methods, the Selective Catalytic Reduction (SCR) method has become the mainstream technology for flue gas denitrification in thermal power plants because of its high efficiency and cost-effectiveness. However, the currently used selective catalytic reduction of NO x The V-W-Ti series catalysts require a higher reaction temperature, which is generally required to be controlled at 573~673K. In order to avoid reheating the flue gas, the SCR device must be placed before the desulfurization and dust removal, but in this way, the SO in the flue gas 2 and dust will cause different degrees of catalyst deactivation, which shortens the life of the catalyst; although the SCR device is placed...

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Problems solved by technology

In order to avoid reheating the flue gas, the SCR device must be placed before the desulfurization and dust removal, but in this way, the SO in the flue gas 2 and dust will cause different degrees of catalyst deactivation, which shortens the life of the catalyst; although the SCR device is placed behind the desulfurization and dust removal device, the catalyst life can be extended, but since the temperature of the flue gas after desulfurization and dust removal is generally lower than 433K, the flue gas temperature must be controlled. The repeated heating of gas will greatly increase the cost of denitrification; and, if the SCR device is installed on the boiler that has been put into use, it is necessary to carry out a major transformation of the dust collector and desulfurization device, which will greatly increase the investment cost; therefore, it is necessary to develop a low-temperature (≤423K) selective catalytic reduction catalyst (also called low temperature SCR catalyst) is very necessary

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