Zur plasmachemischen Umsetzung von CO/H₂‐Gemischen zu leichten Kohlenwasserstoffen in einer Glimmentladung

Abstract

ZusainmenfsssungCO/H,-Gemische lassen sich durch nichtthermische Aktivierung in einer Glimmentladung teilweise in Kohlenwasserstoffe (KW), insbesondere Methan, umsetzen. Als hochster Umsetzungsgrad des CO --+ KW ergab sich 12%, a h hochster Methan-Partialdruck 3%. Die CO-Umsetzung ist abhangig von den Entladungsparametern, der Entladungszeit bzw. dem Energieeinsatz und dem CO/H,-Mischungsverhaltnie. Die gebildeten KW sind Zwischenverbindungen, die zu hoheren, darunter auch festen KW, weiterreagieren. Auf Grund massenspektrometrischer Ionenanalysen wurde fur die KW-Bildung ein Reaktionsschema entwickelt, das sowohl fur ionische als such fur Neutralteilchen-Reaktionen als giiltig angesehen wird. AbstractMixtures of CO und H, can be partially converted into hydrocarbons (Hc), especially methane, by nonthermsl activation in a glow discharge. The degree of conversion a CO + Hc and the partial pressure of methane reached values of 12% and 3% resp. The CO-conversion depends on the discharge parameters. the discharge time the energy input reap., and the rate of CO/H,-mixture. The Hc formed are intermediate producb which react further to higher Hc including solid Ho. According t o maas spectrometrical analysis of plasma ions a reaction scheme wan developed which is considered to be valid for the Hc formation based on an ion an well on neutral particle reactions.

Conversion of CO[sub 2] to CO and Hydrocarbons by Plasma Reaction

“…Gaseous products detected in the present study in the mixture of CO 2 and H 2 were CO, CH 4 , C 2 H 4 , and C 2 H 6 , in accordance with recent research. 8,9,19 In plasma physics, however, the role of electrodes has not been taken into consideration, probably because reactions would proceed under extremely excited conditions where the electrode can play only a limited role. In the present study, a significant difference could be observed between Cu and Fe electrodes, implying that the electrode may play a certain role even in the plasma reactions.…”

“…[5][6][7] Processing of CO 2 and/or CO in the gas phase has also attracted attention from a view of the environmental problem. Mach et al 8 proposed the mechanism for hydrocarbon formation from CO/H 2 to CH 4 . Matsumaru et al 9 tried to decompose CO 2 to CO by ac glow discharge and gave a decomposition mechanism.…”