Selective catalytic reduction (SCR) flue gas denitrification catalyst and preparation method thereof

Abstract

The invention discloses a selective catalytic reduction (SCR) flue gas denitrification catalyst and a preparation method thereof. The components of the denitrification catalyst comprise titanium dioxide serving as a catalyst, manganese dioxide serving as a main active component, tungsten trioxide serving as a cocatalyst, and aluminum oxide gel serving as a structural supporting material for bonding the denitrification catalyst into particles. The preparation method comprises: loading ammonium tungstate and manganese acetate, which serve as transitional components, on titanium dioxide, adding aluminum oxide gel for bonding and serving as the structural support of the titanium dioxide, and preparing catalyst particles by forming; and drying gradually at different times and roasting for activating; and thus, preparing the SCR flue gas denitrification catalyst disclosed by the invention. In the invention, the temperature window of the catalyst is enlarged, high denitrification activity iskept in a temperature range from 150 to 250 DEG C, and high thermal stability is kept in a temperature range from 250 to 400 DEG C. The catalyst also has the advantages of simple preparation process,low cost and high sulfurresisting performance.

Description

technical field [0001] The invention relates to a catalyst for SCR flue gas denitrification. Background technique [0002] NO in boiler flue gas X Mainly including NO, NO 2 , N 2 O (collectively referred to as nitrogen oxides, referred to as "nitrate") is one of the main sources of air pollution. It not only causes acid rain, photochemical smog, greenhouse effect and a series of problems that damage the earth's ecological environment, but also directly harms the health of the human body. healthy. Governance NO X One of the main methods of pollution is to put NO in the flue gas X Revert to N 2 (nitrogen, this process is called flue gas denitrification), NH 3 (Ammonia) is again the most effective reducing agent ever discovered. Among them, the selective catalytic reduction (SCR) denitration method of adding a catalytic device and its catalyst to the denitrification device is better than using only the reducing agent NH 3 The non-selective catalytic reduction (SNCR) de...

AI Technical Summary

Problems solved by technology

However, since the denitration catalyst is still TiO 2 -V 2 o 5 One of the catalytic systems, so there are still raw materials (mainly V 2 o 5 ) relatively high cost; in particular, this type of catalyst needs to be effective at a relatively high flue gas temperature (generally 300 ° C ~ 400 ° C), and under the promotion of a higher temperature, high concentrations of dust and flue gas SO 2 It is easy to cause poisoning, so this type of catalyst has the disadvantage of short service life; and, when SO in the flue gas 2 When the concentration is higher, the catalytic activity of this type of catalyst will decrease

In addition, in the process of preparing the denitration catalyst, the process is relatively complicated. For example, it needs to be calcined and ground once to obtain tungsten-doped titanium powder, and then it needs to be calcined after mixing with the remaining components. (activate) once

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