School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
School of Material Science and Engineering, Changzhou University, Changzhou 213164, China.
Molecules. 2023 Apr 16;28(8):3511. doi: 10.3390/molecules28083511.
Cu-doped manganese oxide (Cu-MnO) prepared using aerosol decomposition was used as a CO oxidation catalyst. Cu was successfully doped into MnO due to their nitrate precursors having closed thermal decomposition properties, which ensured the atomic ratio of Cu/(Cu + Mn) in Cu-MnO close to that in their nitrate precursors. The 0.5Cu-MnO catalyst of 0.48 Cu/(Cu + Mn) atomic ratio had the best CO oxidation performance, with and as low as 48 and 69 °C, respectively. The 0.5Cu-MnO catalyst also had (1) a hollow sphere morphology, where the sphere wall was composed of a large number of nanospheres (about 10 nm), (2) the largest specific surface area and defects on the interfacing of the nanospheres, and (3) the highest Mn, Cu, and Oads ratios, which facilitated oxygen vacancy formation, CO adsorption, and CO oxidation, respectively, yielding a synergetic effect on CO oxidation. DRIFTS-MS analysis results showed that terminal-type oxygen (M=O) and bridge-type oxygen (M-O-M) on 0.5Cu-MnO were reactive at a low temperature, resulting in-good low-temperature CO oxidation performance. Water could adsorb on 0.5Cu-MnO and inhibited M=O and M-O-M reaction with CO. Water could not inhibit O decomposition to M=O and M-O-M. The 0.5Cu-MnO catalyst had excellent water resistance at 150 °C, at which the influence of water (up to 5%) on CO oxidation could be completely eliminated.
采用气溶胶分解法制备的铜掺杂氧化锰（Cu-MnO）用作 CO 氧化催化剂。由于硝酸盐前体具有封闭的热分解特性，Cu 成功地掺杂到 MnO 中，这确保了 Cu-MnO 中 Cu/(Cu+Mn)的原子比接近其硝酸盐前体的原子比。具有 0.48 Cu/(Cu+Mn)原子比的 0.5Cu-MnO 催化剂具有最佳的 CO 氧化性能，其 分别低至 48 和 69°C。0.5Cu-MnO 催化剂还具有（1）空心球形态，其中球壁由大量纳米球（约 10nm）组成，（2）纳米球界面上具有最大的比表面积和缺陷，（3）最高的 Mn、Cu 和 Oads 比值，分别有利于氧空位形成、CO 吸附和 CO 氧化，从而对 CO 氧化产生协同效应。DRIFTS-MS 分析结果表明，0.5Cu-MnO 上的末端型氧（M=O）和桥接型氧（M-O-M）在低温下具有反应活性，从而具有良好的低温 CO 氧化性能。水可以吸附在 0.5Cu-MnO 上，并抑制 M=O 和 M-O-M 与 CO 的反应。水不能抑制 O 分解为 M=O 和 M-O-M。0.5Cu-MnO 催化剂在 150°C 时具有出色的耐水性，水（高达 5%）对 CO 氧化的影响可完全消除。
