Ultrastable PtCo/Co3O4-SiO2 Nanocomposite with Active Lattice Oxygen for Superior Catalytic Activity toward CO Oxidation
Ultrastable PtCo/Co3O4-SiO2 Nanocomposite with Active Lattice Oxygen for Superior Catalytic Activity toward CO Oxidation
复制标题
具有活性晶格氧的超稳定 PtCo/Co3O4-SiO2 纳米复合材料，具有优异的 CO 氧化催化活性
DOI：
10.1021/acs.inorgchem.9b02937
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发表时间：
2020
影响因子：
4.6
通讯作者：
Yu Shuhong
中科院分区：
文献类型：
--
作者：
Wu D;an;Jia Runping;Wen Ming;Zhong Shuai;Wu Qingsheng;Fu Yongqing;Yu Shuhong
在苛刻条件下具有长期耐久性的纳米结构催化剂对于优异的催化性能是非常重要的。本文利用金属与载体间强相互作用产生的表面活性晶格氧，开发了一种新型超稳定PtCo/Co 3 O 4-SiO2纳米催化剂，以提高其对一氧化碳（CO）氧化的催化性能。这种结构可以克服Co 3 O 4-SiO2在水蒸气中失活和Pt在低温下活性差的问题。此外，Co 3 O 4-SiO2纳米片在高达800 °C的高温下赋予上级的结构稳定性，这使得PtCo/Co 3 O 4-SiO2纳米复合材料具有用于CO氧化的长期催化循环能力。此外，纳米片结构的大比表面积（294 m2 g-1）可以暴露丰富的表面活性晶格氧，这显著增强了CO氧化在50 °C下超过30天的催化活性，而PtCo纳米颗粒在50至400 °C的20个循环后没有明显聚集。它有望成为一种超稳定高效催化剂。
A nanostructural catalyst with long-term durability under harsh conditions is very important for an outstanding catalytic performance. Herein, a new ultrastable PtCo/Co3O4–SiO2nanocatalyst was explored to improve the catalytic performance of carbon monoxide (CO) oxidation by virtue of the surface active lattice oxygen derived from strong metal–support interactions. Such a structure can overcome the issues of Co3O4–SiO2inactivation by water vapor and the Pt inferior activity at low temperature. Further, Co3O4–SiO2nanosheets endow superior structure stability under high temperatures of up to 800 °C, which gives long-term catalytic cyclability of PtCo/Co3O4–SiO2nanocomposites for CO oxidation. Moreover, the large specific surface areas (294 m2g–1) of the nanosheet structure can expose abundant surface active lattice oxygen, which significantly enhanced the catalytic activity of CO oxidation at 50 °C over 30 days without apparent aggregation of PtCo nanoparticles after 20 cycles from 50 to 400 °C. It can be expected to be a promising candidate as an ultrastable efficient catalyst.