Low Temperature Catalytic Water Gas Shift in an Electric Field

Non‐Thermal Plasma Activation of Gold‐Based Catalysts for Low‐Temperature Water–Gas Shift Catalysis

“…Alternatives to thermally activated processes have recently been explored to enhance low temperature oper- ation, amongst which the non-thermal plasma activation of catalysts [1][2][3][4] which, in many cases,has been shown to provide high conversions for irreversible exothermic reactions. [1][2][3][4][5][6][7][8][9][10][11][12] Examples include decomposition of volatile organic compounds (VOCs) and hydrogenation reactions. [4][5][6][7][8][9]12,13] Nonthermal plasmas have also been widely used with endothermic processes such as reforming processes [14][15][16][17] leading to high H 2 and CO selectivities.…”

“…[4][5][6][7][8][9]12,13] Nonthermal plasmas have also been widely used with endothermic processes such as reforming processes [14][15][16][17] leading to high H 2 and CO selectivities. [14][15][16] Sekine et al showed an enhancement in activity with increasing current on applying an electric field to the forward water-gas shift reaction when the catalyst was also heated to 423-873 K. [2] Thew ater-gas shift reaction has also been reported in close proximity of aplasma source,that is,post plasma catalysis,toenhance the hydrogen production following ap lasma activated ethanol reforming system. [17] Therein, the water-gas shift reaction used the heat generated from the plasma system to transform the reformed products.…”

“…This dependence on applied voltage is in contrast with Sekine et al which may reflect the application of aD C compared with AC electric field. [2] Despite the excellent activity at relatively low reaction temperatures,A u-based catalysts are often affected by significant deactivation with time on stream. [24][25][26][27][28][29] Herein, as imilar deactivation behaviour was observed for similar starting conversions of CO under thermal (178 8 8C) and plasma conditions ( Figure S4).…”

Catalytic Reaction Assisted by Plasma or Electric Field

“…To promote the kinetic rate to facilitate reactions at low temperatures, we performed WGS reactions in the DC electric field. Results presented in Table show that WGS proceeds over M/CeO 2 (M=Pt, Pd, Rh) and Pt/La‐ZrO 2 catalysts, even at temperatures as low as 423 K in the electric field . In addition, Pt/La‐ZrO 2 catalyst showed high activity for reverse water gas shift (RWGS) reaction, which requires high temperatures because of thermodynamics, at such a low temperature condition in the electric field …”

“…To elucidate the electric field effects, kinetic parameters were evaluated by examining Arrhenius plots for WGS and partial pressure dependences of reactants (i. e. CO and H 2 O) using Pt/La‐ZrO 2 catalyst . According to Arrhenius plots, the apparent activation energy was, respectively, 98.3 kJ mol −1 for the reaction without the electric field, and 50.9 kJ mol −1 for the reaction in the electric field.…”