Low-temperature selective catalytic reduction NOx catalyst based on nanometer activated carbon microspheres and preparation method thereof

Abstract

The invention discloses a low-temperature selective catalytic reduction NOx catalyst based on nanometer activated carbon microspheres and a preparation method of the low-temperature selective catalytic reduction NOx catalyst based on the nanometer activated carbon microspheres. The preparation method comprises the following steps of dissolving saccharides, titanium compounds, alkali metal salts and transition metal salts in water according to a molar concentration ratio of 1: 0.01-4:0.5-3:0.01-1 to obtain mixed solution, and adjusting the pH value of the mixed solution into 1-3; and atomizing the mixed solution into aerosol in an ultrasonic way, then inputting N2 or Ar as carrier gas into a tube furnace, conducting calcinations in 300-900 celsius degrees, and obtaining the low-temperature selective catalytic reduction NOx catalyst based on the nanometer activated carbon microspheres. According to the low-temperature selective catalytic reduction NOx catalyst, operation temperature of selective catalytic reduction (SCR) is lowered, and in the SCR technology, a high NO removal rate can be reached below 150 celsius degrees when NH3 is as catalyst. Moreover, when SO2 is contained in a system, higher catalytic efficiency is still kept, and poisoning of SO2 to the system has recoverability.

Description

technical field [0001] The invention relates to a catalyst used in the technical field of air pollution control, in particular to a MO based on nano activated carbon microspheres prepared by ultrasonic atomization decomposition method x Low-temperature Selective Catalytic Reduction of NO by CNS x catalyst. Background technique [0002] After years of research and practice, using NH 3 SCR flue gas denitrification as a reducing agent has become increasingly mature, and the SCR catalysts for industrial applications are mainly V 2 o 5 -WO 3 / TiO 2 (V 2 o 5 -MoO 3 / TiO 2 ), the operating temperature range of this type of catalyst is roughly between 300 and 400 °C, and it is placed before the desulfurization and dust removal device. In practical applications, such catalysts have anti-SO 2 The advantages of strong ability and stable operation. [0003] However, due to the high operating temperature required by industrial catalysts, the SCR denitration device must be pla...

AI Technical Summary

Problems solved by technology

Although it has been reported that TiO 2 As a carrier, it can reduce the stability of sulfates on the surface of the catalyst and protect the active material, thereby improving the sulfur resistance of the catalyst. However, TiO 2 Supported catalysts still have SO 2 inactivation phenomenon

In addition, although many studies have been carried out on the anti-sulfur performance of different catalysts, it is still unsolved to solve the problem of SO in the temperature range below 150 °C. 2 Problems causing catalyst deactivation