Promotion Effects of Barium and Cobalt on Manganese Oxide Catalysts for Soot Oxidation
Promotion Effects of Barium and Cobalt on Manganese Oxide Catalysts for Soot Oxidation
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钡和钴对氧化锰催化剂烟灰氧化的促进作用
DOI：
10.1021/acs.iecr.1c01524
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发表时间：
2021-08
影响因子：
4.2
通讯作者：
Hong He
中科院分区：
文献类型：
--
作者：
Ke Xu;Meng Wang;Yan Zhang;Wenpo Shan;Hong He
本研究考察了锰基复合催化剂的催化性能以及钡和钴的引入对MnOx催化剂的影响。采用简单的共沉淀法制备了锰基复合催化剂，并采用湿法浸渍法负载钴。4%Co/BaMnOx样品在1000 ppm NO/10%O2/N2气流中的T50值为402 °C，表现出最好的催化活性和稳定性。采用XRD、BET、SEM、O2-TPD、H2-TPR和XPS等手段对催化剂进行了表征。XRD、BET和SEM结果表明，钡和钴的引入改变了催化剂的物相结构，降低了催化剂的晶粒尺寸和结晶度。NO-TPO实验表明，Ba的负载可以在低温（200-380 °C）下提高NOx的存储容量，并在380-500 °C下脱附NO2，脱附的NO2可以有效地提高催化剂的活性。H2-TPR、O2-TPD和XPS表征结果表明，钴的引入改善了催化剂的氧化还原性能，这是其优异的碳烟燃烧催化性能的关键因素。因此，氧化还原性能和NOx存储和解吸能力的协同作用是提高碳烟燃烧催化剂活性的关键因素。该研究为钴和钡在碳烟催化氧化过程中的作用提供了理论依据。
In this study, the catalytic performance of manganese-based compound catalysts and the influence of the introduction of barium and cobalt on the MnOxcatalyst were investigated. Mn-based compound catalysts were synthesized by a simple co-precipitation method while the cobalt was loaded by wet impregnation. The 4% Co/BaMnOxsample exhibited the best catalytic activity and stability in soot oxidation, with aT50value of 402 °C in the 1000 ppm NO/10% O2/N2gas flow. The catalysts were characterized by several analytical techniques such as XRD, BET, SEM, O2-TPD, H2-TPR, and XPS to reveal their physicochemical properties. The phases of catalysts changed and the crystallite sizes and crystallinity decreased after the introduction of barium and cobalt, as confirmed by the XRD, BET, and SEM results. NO-TPO experiments revealed that the loading of barium could increase the NOxstorage capacity at low temperatures (200–380 °C) and then desorb NO2at 380–500 °C, and the additional desorbed NO2could promote the catalytic activity effectively. The characterization (H2-TPR, O2-TPD, and XPS) results confirmed that the redox properties of the catalyst were improved after the introduction of cobalt, which is a key factor in its excellent catalytic performance for soot combustion. Consequently, the synergistic effects of redox properties and NOxstorage and desorption ability are key factors for improving the catalytic activity during soot combustion. This study provided rational insights into the roles of cobalt and barium in the process of soot catalytic oxidation.
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发表时间：
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期刊：
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影响因子：
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