Strong chemical interaction between PdO and SnO2 and the influence on catalytic combustion of methane
Strong chemical interaction between PdO and SnO2 and the influence on catalytic combustion of methane
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DOI：
10.1016/s0926-860x(03)00418-6
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发表时间：
2003-10
影响因子：
5.5
通讯作者：
T. Takeguchi;Okanishi Takeoh;S. Aoyama;Junya Ueda;R. Kikuchi;K. Eguchi
中科院分区：
文献类型：
--
作者：
T. Takeguchi;Okanishi Takeoh;S. Aoyama;Junya Ueda;R. Kikuchi;K. Eguchi
采用浸渍法(PdO/SnO2)和共沉淀法(PdO-SnO2)制备了几种钯锡氧化物(PdO-SnO2)催化剂。在测试的催化剂中，通过浸渍法制备的SnO2负载11wt.% PdO催化剂在低温下表现出最高的转化率。 PdO/SnO2的还原和吸附性能与PdO/Al2O3和PdO/ZrO2有较大差异。这些催化剂的X射线衍射(XRD)表明，浸渍催化剂中10nm的PdO颗粒负载在SnO2上，而共沉淀催化剂由均匀的PdO-SnO2混合氧化物颗粒组成。即使在室温下，PdO/SnO2中的PdO颗粒也很容易被还原为金属Pd并吸收H2，H2/Pd重量比为0.3%。在PdO/SnO2和PdO-SnO2样品中，由于Pd和SnO2之间的相互作用，CO的吸附被显着抑制；金属表面积很难通过 CO 脉冲技术估计。
Several palladium-tin oxide (PdO-SnO2) catalysts were prepared by the impregnation (PdO/SnO2) and co-precipitation (PdO-SnO2) methods. Among the catalysts tested, the SnO2-supported 11wt.% PdO catalyst prepared by the impregnation method showed the highest conversion at low temperatures. The reduction and adsorption properties of PdO/SnO2were quite different from those of PdO/Al2O3and PdO/ZrO2. X-ray diffraction (XRD) of these catalysts revealed that 10nm PdO particles were supported on SnO2for the impregnated catalysts, while the co-precipitated catalysts were composed of uniform PdO-SnO2mixed oxide particles. Even at room temperature, the PdO particles in PdO/SnO2were easily reduced to metallic Pd and absorbed H2with the H2/Pd weight ratio of 0.3%. In both PdO/SnO2and PdO-SnO2samples, adsorption of CO was significantly suppressed because of the interaction between Pd and SnO2; the metal surface area was difficult to estimate by the CO pulse technique.