Plasma catalysis

Tonkyn, R. G. Barlow, S. E. and Hoard, J. W, Reduction of NOx in synthetic diesel exhaust via two-step plasma-catalysis treatment AppL Caial B Environ., 2003, 40, 207-217... 

Ions are charged heavy particles, that are able to make a sigiuficant contribution to plasma-chemical kinetics either due to their high energy (as in the case of sputtering and reactive ion etching) or due to their ability to suppress activation barriers of chemical reactions. This second feature of plasma ions results in the so-called ion or plasma catalysis, which is particularly essential in plasma-assisted ignition and flame stabilization, fuel... 

Positive ions are obvionsly major players in plasma-chemical processes. Their exothermic reactions with neutrals usually have no activation energy, which makes their contribution significant in many specific plasma-chemical processes, particularly in plasma catalysis. In addition to high chemical activity, the ions can have significant kinetic eneigy, which determines their contribntion, for example, in reactive ion etching. 

Other Processes of Decomposition, Elimination, and Isomerization of Hydrocarbons in Non-Equilibrium Plasma Plasma Catalysis... 

General Features of Plasma-Assisted Production of Hydrogen from Hydrocarbons Plasma Catalysis... 

Plasma Catalysis for Syngas Production by Partial Oxidation of Methane in Non-Equilibrium Gliding Arc Stabilized in Reverse Vortex (Tornado) Flow... 

Plasma Catalysis in the Process of Hydrogen Production by Direct Decomposition (Pyrolysis) of Methane... 

Similar to the pyrolysis of ethane (10-5), effective plasma catalysis takes place in the direct plasma decomposition of methane with the production of soot and lydrogen ... 

Mechanism of Plasma Catalysis of Direct CH4 Decomposition in Non-Equiiibrium Discharges... 

The 0/C ratio in the process is 1.23, which is close to the ideal partial oxidation reaction. The process produces nitrogen-diluted syngas containing up to 45% of H2 + CO. The output syngas flow rate is 2.7 standard m /h, which is equivalent to 8.6 kW of output power. In terms of plasma catalysis, discharge power in this case (0.1 kW) is only 1.2% of the total power of the produced syngas. Reaction (10-12) proceeds with the total absence of soot. 

Figure 10-15. Illustration of the plasma catalysis in the steam conversion of kerosene. Additional plasma energy input Aft = 0.2 J/cm (pathway 0-3) leads not to an increase, but to a decrease of temperature in the system. Additional thermal energy input of the equivalent value (pathway 1 -A) results in lower conversion degree and increase of temperature in the system. Curve 2 represents experiments with the plasma-catalytic microwave discharge.

Combined Plasma-Catalytic Approach Versus Plasma Catalysis in Processes of Hydrogen Production by Partial Oxidation of Hydrocarbons... 

Plasma Catalysis of Hydrogen Production by Direct Decomposition (Pyrolysis) of Ethane. Interpreting the plasma-catalytic effect of ethane decomposition and hydrogen production illustrated in Fig. 10-10, explain why the application of thermal plasma results in an increase of gas temperature, while application of non-equilibrium plasma results in gas cooling and additional hydrogen production. Compare the thermodynamics of these systems with that of refrigerators and heat pumps. 

Mutaf-Yardimci, O. (2001), Plasma-Catalysis in Hydrocarbon Processing by Using Non-Equilibrium Plasma Discharges, Ph.D. Dissertation, University of Illinois at Chicago, Chicago, IL. 

Looking back over the development of plasma catalysis the authors note that several plasma systems have been studied in the presenre of different materials that are known to be catalysts in chemical reactions. However, most studies have been... 

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