Low Temperature Catalytic Water Gas Shift in an Electric Field
Low Temperature Catalytic Water Gas Shift in an Electric Field
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DOI：
10.1007/s10562-016-1765-y
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发表时间：
2016-08-01
影响因子：
2.8
通讯作者：
Ogo, Shuhei
中科院分区：
文献类型：
--
作者：
Sekine, Yasushi;Yamagishi, Kodai;Ogo, Shuhei
在423-873 K温度范围内，对催化剂床施加电场进行了催化水煤气变换制氢的研究。根据热力学平衡和化学动力学规律研究了反应趋势。通过筛选实验选择Pt/La-ZrO 2作为活性催化剂，通过改变反应温度和外加电流考察了电场对催化剂活性的影响。虽然该反应在高温下由热力学平衡决定，但在低温下在动力学区域中观察到通过施加电场对反应的剧烈促进。通过对催化剂床层施加电场，观察到WGS的表观活化能急剧下降。各种同位素瞬态测试表明，该反应机制的改变，通过施加电场，和氧化还原机制，使用表面晶格氧的情况下，在电场中的催化WGS中发挥了重要作用。[图形]
Catalytic water gas shift for hydrogen production in the temperature range of 423-873 K, was examined imposing an electric field to the catalyst bed. Reaction trends were investigated based on thermodynamic equilibrium and chemical kinetic law. Pt/La-ZrO2 was chosen as an active catalyst through our screening tests, and the effect of the electric field on the catalytic activity was investigated by changing reaction temperatures and applied electric currents. Although the reaction was ruled by thermodynamic equilibrium at high temperatures, drastic promotion of the reaction by applying the electric field was observed at low temperatures in a kinetic region. Drastic decrease of apparent activation energy for WGS was observed by imposing the electric field to the catalyst bed. Various isotopic transient tests revealed that the reaction mechanism changed by the application of electric field, and redox mechanism using surface lattice oxygen played an important role in case of the catalytic WGS in the electric field.[GRAPHICS]