Venkata D. B. C. Dasireddy, Balaga Viswanadham, Blaz Likozar, Jignesh Valand
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A positive impact of H<sub>2</sub>O on catalytic performance was noted, whereas CO<sub>2</sub> had a suppressive effect. Furthermore, the specific support materials (Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, TiO<sub>2</sub>, and ZrO<sub>2</sub>) were studied to understand their roles in CO oxidation under realistic conditions. In the presence of water, alumina catalysts containing bimetallic metals (Cu–Mn) exhibited 100% CO conversion even at a lower temperature of 160 °C. Conversely, under the predominant influence of CO<sub>2</sub>, alumina catalyst (Cu–Mn) showed 55% CO conversion. The exceptional performance was attributed to CO preferential adsorption on highly active Cu–Mn sites and a small H<sub>2</sub>-oxidative atmosphere of the catalysts. The activity results highlighted the strong dependence of CO conversion on reaction temperatures, the presence of metals, and the types of supports. 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引用次数: 0
摘要
净化水气变换原料中的一氧化碳(CO)对燃料电池的应用至关重要。催化转化富氢原料中的一氧化碳是环境催化领域的一项重大挑战。为解决这一问题,研究人员采用了一系列铜锰基单金属和双金属催化剂,这些催化剂具有不同的支撑物(如氧化铝、二氧化硅、氧化锆和二氧化钛)。利用温度编程技术观察了这些催化剂的还原和氧化行为。调查包括测试铜基和锰基支撑催化剂在 H2O 和 CO2(模拟现实条件)存在的不同温度下的 CO 氧化作用。结果表明,H2O 对催化性能有积极影响,而 CO2 则有抑制作用。此外,还研究了特定的支撑材料(Al2O3、SiO2、TiO2 和 ZrO2),以了解它们在现实条件下对 CO 氧化的作用。在有水存在的情况下,含有双金属(Cu-Mn)的氧化铝催化剂即使在 160 ℃ 的较低温度下也能实现 100% 的 CO 转化。相反,在二氧化碳的主要影响下,氧化铝催化剂(Cu-Mn)的二氧化碳转化率为 55%。这种优异的性能归因于 CO 优先吸附在高活性的 Cu-Mn 位点上,以及催化剂的 H2- 氧化气氛较小。活性结果表明,一氧化碳转化率与反应温度、金属存在和载体类型密切相关。总之,这些研究结果表明,这些催化剂有可能在现实条件下用于 H2 净化。
CO-Free Fuel Processing of Water Gas Shift Feedstocks: Effect of Support on CuMn Spinel Performance
Cleaning up carbon monoxide (CO) in water gas shift feedstocks is crucial for fuel cell applications. The catalytic transformation of CO in hydrogen-rich feeds poses a significant challenge in environmental catalysis. To address this issue, a range of Cu–Mn-based monometallic and bimetallic catalysts with diverse supports (such as alumina, silica, zirconia, and titania) were employed. Temperature programming techniques were utilised to observe the reduction and oxidation behaviours of these catalysts. The investigation involved testing CO oxidation at various temperatures over copper and manganese-based supported catalysts in the presence of H2O and CO2 (simulating realistic conditions). A positive impact of H2O on catalytic performance was noted, whereas CO2 had a suppressive effect. Furthermore, the specific support materials (Al2O3, SiO2, TiO2, and ZrO2) were studied to understand their roles in CO oxidation under realistic conditions. In the presence of water, alumina catalysts containing bimetallic metals (Cu–Mn) exhibited 100% CO conversion even at a lower temperature of 160 °C. Conversely, under the predominant influence of CO2, alumina catalyst (Cu–Mn) showed 55% CO conversion. The exceptional performance was attributed to CO preferential adsorption on highly active Cu–Mn sites and a small H2-oxidative atmosphere of the catalysts. The activity results highlighted the strong dependence of CO conversion on reaction temperatures, the presence of metals, and the types of supports. Overall, these findings suggest the potential use of these catalysts for H2 purification under realistic conditions.
期刊介绍:
Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis.
The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.