The kinetics of the reaction between CO and O2 over bimetallic Pt-Rh/Al2O3 catalysts was studied with a differential fixed bed flow reactor running under reducing conditions (CO/O2>5). Temperature, CO and O2 partial pressures were in the range 25–500°C, 5×103 to 9×103 and 0.25×...
The kinetics of the reaction between CO and O2 over bimetallic Pt-Rh/Al2O3 catalysts was studied with a differential fixed bed flow reactor running under reducing conditions (CO/O2>5). Temperature, CO and O2 partial pressures were in the range 25–500°C, 5×10−3 to 9×10−3 and...
采用旋转圆盘电极(RDE)在O2饱和的0.1 M KOH电解质中对CR-Co/ClNC和商用Pt/C进行ORR性能测试。线性扫描伏安曲线(LSV)(图3a)显示,CR-Co/ClNC表现出最佳的ORR活性,其半波电位(E1/2)为0.93 V vs.RHE,明显优于商业Pt/C、Co/NC和NC(图3b)。在0.85 V电位下,CR-Co/ClNC的动态电流密度(Jk)高达95.2 mA cm...
因此,O2在Fe-N4上的吸附构型与以前不同,即O2以更大的倾角与Fe相互作用,并产生Fe-O键。 图4. ER1机理势能面 如图4a所示,IS是物理吸附的CO在预吸附的O2周围,而物理吸附的CO2和化学吸附的O原子是FS。CO与预吸附的O2反应形成过渡态(TS)的总势垒为0.79eV。该反应过程释放出3.50eV的能量,表明Fe-C3N的ER1机...
Figure 4. (a) The water adsorption models and binding energy of CoP (left) andOH--CoP (right). Calculated free energy diagram of the (b) HER and (c)CO2RR on CoP and OH−-CoP. (d) Calculated thermodynamic reaction potential of the HER andCO2RR on CoP andOH--CoP. ...
该工作不仅为低温催化燃烧CO催化剂的设计和开发提供了理论依据,也为CO燃烧反应的动力学模型提供了数据支持。 文献信息 Qin Chunlan et.al Theoretical study on the reaction kinetics of CO oxidation by nitrogen-doped graphene catalysts with different ligand structures Molecular Catalysis 2023....
水煤气变换反应(WGS: water-gas shift reaction)，即CO + H2O= CO2+ H2。.该反应可在有水蒸气的气氛下氧化co,对于纯化H2,消除PEMFC中毒害Pt电极的少量CO方面具有十分重要的作用,因此WGS反应成为许多研究者的课题。当前用于该反应的工业催化剂一般为Cu/ZnO/Al2O3,具有较好的稳定性，但在低温水煤气变换反应中...
与Fe-CN3相比,Fe-C2N2对O2具有更高的亲和力。Fe-C2N2通过0.79eV的势垒产生类碳酸盐中间体(CO3),并且该过程释放出3.38eV的反应能量。此外,类碳酸盐(CO3)分解为化学吸附的O原子和游离CO2需要克服高达0.93eV的能垒,这意味着Fe-C2N2单原子催化剂在ER2机理上的限速步骤是CO3的分解。虽然Fe-CN3比Fe-C2N2更...
而当配位数为4时,催化剂用于CO氧化的能垒高于Fe-CN3的能垒,后者为0.91eV。这与Fe-N4对CO的高选择性有关,并且当CO吸附能高时,O2活化两个CO分子形成五元环中间体需要高能量。总之,在富含CO的环境中,Fe-CN3对CO具有更好的催化氧化活性。 图8. 比例关系...
Mechanism of the C2H5+O2 reaction The geometries, energies, and vibrational frequencies of the reactants, transition states, intermediates, and products of the reaction of ethyl radical wit... IS Ignatyev,Y Xie,WD Allen,... - 《Journal of Chemical Physics》 被引量: 193发表: 1997年 ...