Pt-Al2O3 catalyst and discharge plasma pre-treatment techniques for enhancing selective catalytic reduction of nitrogen oxides: a comparative study

Abstract

This paper reports the effect of pretreatment of the gas stream by two different oxidation techniques, viz. by a noble metal catalyst and electric discharge plasma on selective catalytic reduction of nitrogen oxides.

Removal of NOx with Selective Catalytic Reduction Based on Nonthermal Plasma Preoxidation

“…An increase in N 2 O generation with increasing input energy density was also observed, which could be related to reaction ,, NO 2 + normalN → normalN 2 normalO + normalO .25em normalk = 5.8 × 10 - 12 true( normalT 298 true) 1.0 exp ( 1.83 RT ) cm 3 molecule - 1 normals - 1 …”

“…The current was obtained by measuring the voltage of a noninductive resistor of 50 Ω connected in series in the high voltage source. The discharge power was measured by checking the charge-voltage (Q-U) Lissajous. − Figure (a) shows an example of the voltage waveforms measured at the discharge electrode and the 44 nF equivalent capacitor, respectively, while Figure (b) shows the typical Q-U plot at the corresponding voltage, i.e. the Lissajous figure.…”

Experimental Study on NO Pre-Oxidation in C₃H₆/NO/N₂/O₂ Mixture by Non-Thermal Plasma

“…However, properly increasing the proportion of NO 2 /NO x can elevate the reducibility of SCR system. When the proportion of NO 2 /NO x equals to1/1, SCR reaction can be speeded up and NO x conversion efficiency is at its highest [3][4][5].…”

Hydrogen Storage in Mesoporous Metal Oxides with Catalyst and External Electric Field

“…Metal oxides still attract attention for adsorption due to their wide application in catalysis, − gas storage, − and sensors. − However, with respect to the usage in physisorption of hydrogen, few research outcomes have been reported, , since there remains the difficult task of synthesizing highly porous metal oxides with unsaturated metal centers, which account for the strong interaction with hydrogen. − Nickel oxides and magnesium oxides are polar materials with an intrinsic dipole moment. The externally applied electric field could further enhance the dipole moment so that the hydrogen could be more strongly adsorbed.…”

“…Metal oxides still attract attention for adsorption due to their wide application in catalysis, [41][42][43][44][45][46][47][48][49] gas storage, [50][51][52] and sensors. [53][54][55][56] However, with respect to the usage in physisorption of hydrogen, few research outcomes have been reported, 57,58 since there remains the difficult task of synthesizing highly porous metal oxides with unsaturated metal centers, which account for the strong interaction with hydrogen.…”