The relationship between the oxygen species of cerium-based oxygen carriers and catalytic behavior, namely the correlation between catalytic activity and surface lattice oxygen (O_S-L) and that between catalytic stability and bulk lattice oxygen (O_B-L), was investigated by using CH₃SH and Ce_1-xY_xO_2-δ (x = 0, 0.25, 0.50, 0.75, and 1.0) solid solutions as examples. Activity and stability experimental studies with corresponding XPS were performed to assess the role of definite surface oxygen in cerium-based oxygen carriers. The surface lattice oxygen (O_S-L), rather than the surface adsorbed oxygen (O_S-A), was observed to be responsible for the catalytic decomposition of CH₃SH. Further, the difference in catalytic activity between CeO₂ and Y-doped samples is closely associated with the insertion of Y³⁺ ion into the lattice of CeO₂ leading to the loss of surface lattice oxygen (O_S-L). H₂-temperature programmed reduction (TPR), a specially designed H₂-TPR, X-ray photoelectron spectroscopy, reaction product (CO and CO₂) analysis, and oxygen storage capacity tests were performed to demonstrate the migration of bulk lattice oxygen, which was directly related to the catalytic stability of CeO₂ and Y-doped catalysts. Direct evidences of the migration of bulk lattice oxygen over cerium-based oxygen carriers were obtained. Additionally, the migration rate of bulk lattice oxygen (O_B-L) within Ce_0.75Y_0.25O_2-δ was faster compared to the migration rate of bulk lattice oxygen (O_B-L) of CeO₂. Finally, improvements in catalytic stability are closely associated with the fact that bulk lattice oxygen (O_B-L) participates in the decomposition of CH₃SH through its faster migration to replenish surface lattice oxygen (O_S-L). The factors that influenced the migration rate of bulk lattice oxygen (O_B-L) were thus also subsequently investigated and discussed.

利用CH ₃研究了铈基氧载体的氧种类与催化行为之间的关系，即催化活性与表面晶格氧（O _S-L）之间的关系以及催化稳定性与本体晶格氧（O _B-L）之间的关系。SH和Ce _1-x Y _x O2 _-δ（x = 0、0.25、0.50、0.75和1.0）固溶体为例。用相应的XPS进行了活性和稳定性实验研究，以评估确定的表面氧在铈基氧载体中的作用。表面晶格氧（O _S-L），而不是表面吸附氧（O _S-A））被认为是CH ₃ SH催化分解的原因。此外，CeO ₂和Y掺杂样品之间催化活性的差异与Y ³⁺离子插入CeO ₂晶格紧密相关，导致表面晶格氧（O _S-L）的损失。进行了H _2-程序升温还原（TPR），专门设计的H ₂ -TPR，X射线光电子能谱，反应产物（CO和CO ₂）分析以及储氧能力测试，以证明本体晶格氧的迁移，这直接关系到CeO ₂的催化稳定性和掺Y的催化剂。获得了大量晶格氧在铈基氧载体上迁移的直接证据。此外，体晶格氧（O的迁移率_B-L ）内的Ce _0.75 ý _0.25 ö _2-δ是更快相比体晶格氧（O的迁移率_B-L的CeO）₂。最后，催化稳定性的提高与以下事实密切相关：本体晶格氧（O _B-L）通过更快地迁移以补充表面晶格氧（O _S-L）参与CH ₃ SH的分解。影响本体晶格氧（O因此，随后也对_BL）进行了研究和讨论。