Novel Catalysts for Methane Combustion Based on Cobalt-Doped Lanthanum Silicates Having an Apatite-type Structure
Novel Catalysts for Methane Combustion Based on Cobalt-Doped Lanthanum Silicates Having an Apatite-type Structure
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DOI：
10.1021/acsami.7b14069
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发表时间：
2017-11-22
影响因子：
9.5
通讯作者：
Imanaka, Nobuhito
中科院分区：
文献类型：
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作者：
Nunotam, Naoyoshi;Moriyama, Naoki;Imanaka, Nobuhito
开发了新型PdO/La_（10）Si_（6-x）CoxO_（27-delta）/γ-Al_2 O_3催化剂，并将其应用于甲烷燃烧。这些材料基于使用La 10 Si 6-xCoxO 27-δ作为促进剂，因为该化合物具有氧化物离子传导性磷灰石型结构，其允许活性氧平滑迁移到PdO活化剂。Co 3 +/2+离子也被引入到原始的La 10 Si 6 O 27晶格中，以增强其氧化还原性能。程序升温还原测量表明，氧的供应是通过引入Co 3 +/2+，其中观察到的还原在290摄氏度的La 10 Si 6-xCoxO 27-delta（x = 1.0），而没有观察到还原低于460摄氏度的La 10 Si 6 O27。在本工作中合成的样品中，PdO/La_（10）Si_（6-x）CoxO_（27-delta）/γ-Al_2 O_3（x = 1.0）表现出当使用PdO/La_（10）Si_（6 O）_（27）/γ-Al_2 O_3时所需的最高催化度C。
Novel PdO/La10Si6-xCoxO27-delta/gamma-Al2O3 catalysts with applications to methane combustion were developed. These materials were based on the use of La10Si6-xCoxO27-delta as a promoter because this compound has an oxide-ion conducting apatite-type structure that allows the smooth migration of active oxygen to the PdO activator. Co3+/2+ ions were also introduced into the original La10Si6O27 lattice to enhance its redox properties. Temperature-programmed reduction measurements revealed that the oxygen supply was facilitated by introducing Co3+/2+, where the reduction was observed at 290 degrees C for La10Si6-xCoxO27-delta (x = 1.0), whereas no reduction was observed below 460 degrees C for La10Si6O27. Among the samples synthesized in this work, PdO/La10Si6-xCoxO27-delta/gamma-Al2O3 (x = 1.0) exhibited the highest catal degrees C required when employing PdO/La10Si6O27/gamma-Al2O3.