Coupled Plasma-Catalytic System with Rang 19pr Catalyst for Conversion of Tar

Abstract

A coupled plasma-catalytic system (CPCS) for the conversion of toluene was investigated and compared to the homogeneous system of gliding discharge plasma. Toluene was used as a model compound, which is present in tars. The study was carried out at atmospheric pressure, in a gas composition similar to the one obtained during pyrolysis of biomass. The effect of the initial toluene concentration, energy supplied to gliding discharge (GD) and the presence of a catalyst on the conversion of toluene was studied. Both the composition of outlet gas and its calorific value were monitored. Based on the obtained results it can be concluded that the conversion of toluene increases with the increase of gliding discharge power. The highest toluene conversion (89%) was received in the coupled plasma-catalytic system (catalyst: RANG-19PR) under the following conditions: CO (0.13 mol. fr.), CO2 (0.12 mol. fr.), H2 (0.25 mol. fr.), N2 (0.50 mol. fr.) and 4400 ppm of toluene with a gas flow rate of 1000 Nl/h. The composition of the outlet gas in the homogeneous system and in the CPCS changed in the range of a few percents. Toluene levels were reduced tenfold. Benzene, C3 and C4 hydrocarbons, as well as acetylene, ethylene and ethane, were detected in the outlet stream in trace amounts. Carbon deposits were present in the reactor. The products of methanation of carbon oxides were detected in the both studied systems. A mechanism of toluene decomposition in the CPCS was proposed. The application of the catalyst brought about an increase in the calorific value of the outlet gas. It was above the minimal level demanded by engines and turbines.

Decomposition of Toluene in Coupled Plasma-Catalytic System

“…Balances are in line at 90–98%, which shows that nearly all of the products generated during the process have been quantified. The mechanism of the process has already been described …”

“…A homogeneous nonthermal plasma and a plasma-catalytic system have been widely used for many environmental technologies. − The plasma conversion of toluene is investigated by many research groups all over the world. − In the coupled plasma-catalytic system, high conversion of toluene and other volatile organic compounds (VOCs) was obtained and the activity of the catalyst was stable. , This may suggest that the use of active catalysts operating in the plasma of gliding discharge can be successfully implemented to obtain higher conversions of tars. Based on the previous experiments conducted in the plasma-catalytic system with nickel as a catalyst, it can be concluded that nickel on the catalyst surface influenced the tar decomposition process. , The purpose of this work was to investigate the effects of the power of discharge, initial concentration of toluene, and the presence of G-0117 catalyst on the conversion of C 7 H 8 and the composition of outlet gas, as well as its calorific value. The goal of the research was to determine the durability of the catalyst activity during a process lasting approx.…”

“…Based on the previous experiments conducted in the plasma-catalytic system with nickel as a catalyst, it can be concluded that nickel on the catalyst surface influenced the tar decomposition process. 29,30 The purpose of this work was to investigate the effects of the power of discharge, initial concentration of toluene, and the presence of G-0117 catalyst on the conversion of C 7 H 8 and the composition of outlet gas, as well as its calorific value. The goal of the research was to determine the durability of the catalyst activity during a process lasting approx.…”

Plasma-Catalytic Process of Hydrogen Production from Mixture of Methanol and Water

“…Various plasma-catalytic systems are used. A catalyst may be located in a plasma zone [1][2][3][4][5][6][7], an electrode may be the catalyst [8,9], and often the catalyst is located outside the plasma zone [1,[10][11][12][13][14][15][16][17][18]. This way of placing the catalyst prevents the destruction of the catalyst by plasma and the disturbance of the discharge.…”

Decomposition of Tars on a Nickel Honeycomb Catalyst

“…Furthermore, for the A3 series, as the discharge power increases, the conversion of toluene decreases by about 5% (Figure 5). This may be due to the lower concentration of hydrogen radicals generated in plasma (compared to the gas B3), which are involved in the activation reaction of toluene in the catalytic process [16]. Moreover, the values of toluene conversion obtained in the plasma-catalytic system are higher than in the homogeneous system [10] throughout the investigated range of initial toluene concentration.…”