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Improvement of CO Oxidation and CH4 Combustion by Pd and Pt Partial Substitution on LaMn0.5Cu0.5O3 Perovskite
Langmuir ( IF 3.7 ) Pub Date : 2023-10-26 , DOI: 10.1021/acs.langmuir.3c01702 Yaghoub Farhang 1 , Ehsan Taheri-Nassaj 1 , Mehran Rezaei 2
Langmuir ( IF 3.7 ) Pub Date : 2023-10-26 , DOI: 10.1021/acs.langmuir.3c01702 Yaghoub Farhang 1 , Ehsan Taheri-Nassaj 1 , Mehran Rezaei 2
Affiliation
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LaMn0.5Cu0.5O3 (LMC) as the parent perovskite and Pd- and Pt-doped LaMn0.5Cu0.5O3 catalysts (LMCPd and LMCPt) instead of Cu were synthesized in a new solid-state synthesis technique at a low temperature. Perovskite lattice formation of the LMC catalyst was successfully performed at 600 °C. All perovskites were investigated by X-ray diffraction, HRTEM, O2-TPD, H2-TPR, BET, and XPS analyses. The prepared perovskites were used as heterogeneous catalysts for CO oxidation and methane combustion reactions. The catalytic performance of the LMC catalyst was noticeably enhanced via Pd and Pt substitution instead of Cu. The enhancement in the mobility of lattice oxygen and specific surface area has triggered this catalytic performance improvement, which play an important role in CO oxidation and methane combustion. The Mn 2p and Mn 3s XPS spectra showed that by doping Pd and Pt in the LMC perovskite, Mn was affected in different states and the Mn 3s peaks were only observed in the LMCPt catalyst. XPS spectra of the LMCPd1 sample showed a high oxidation state of Pd3+ or Pd4+, from which it can be concluded that Pd was successfully incorporated into the LMC perovskite lattice. The H2-TPR profiles of the LMCPd and LMCPt perovskites revealed that the reduction peaks of Cu and Mn were shifted to lower temperatures by increasing Pd and Pt partial substitution due to the synergetic effect of the cation and the H2-spillover effect of palladium and platinum.
中文翻译：
LaMn0.5Cu0.5O3钙钛矿上Pd和Pt部分取代改善CO氧化和CH4燃烧
以LaMn 0.5 Cu 0.5 O 3 (LMC)为母体钙钛矿，采用新型固相合成技术在低温下合成了Pd和Pt掺杂的LaMn 0.5 Cu 0.5 O 3催化剂(LMCPd和LMCPt)代替Cu。LMC催化剂的钙钛矿晶格形成在600℃下成功进行。所有钙钛矿均通过 X 射线衍射、HRTEM、O 2 -TPD、H 2 -TPR、BET 和 XPS 分析进行研究。制备的钙钛矿用作CO氧化和甲烷燃烧反应的多相催化剂。通过用 Pd 和 Pt 替代 Cu，LMC 催化剂的催化性能显着增强。晶格氧迁移率和比表面积的增强引发了催化性能的提高，在CO氧化和甲烷燃烧中发挥着重要作用。Mn 2p 和 Mn 3s XPS 谱表明，通过在 LMC 钙钛矿中掺杂 Pd 和 Pt，Mn 受到不同状态的影响，并且仅在 LMCPt 催化剂中观察到 Mn 3s 峰。LMCPd1样品的XPS谱显示Pd 3+或Pd 4+的高氧化态，由此可以得出Pd已成功结合到LMC钙钛矿晶格中。LMCPd和LMCPt钙钛矿的H 2 -TPR曲线表明，由于阳离子的协同效应和钯的H 2 溢出效应，通过增加Pd和Pt的部分取代，Cu和Mn的还原峰转移到较低的温度和铂金。
更新日期：2023-10-26
中文翻译：
LaMn0.5Cu0.5O3钙钛矿上Pd和Pt部分取代改善CO氧化和CH4燃烧
以LaMn 0.5 Cu 0.5 O 3 (LMC)为母体钙钛矿，采用新型固相合成技术在低温下合成了Pd和Pt掺杂的LaMn 0.5 Cu 0.5 O 3催化剂(LMCPd和LMCPt)代替Cu。LMC催化剂的钙钛矿晶格形成在600℃下成功进行。所有钙钛矿均通过 X 射线衍射、HRTEM、O 2 -TPD、H 2 -TPR、BET 和 XPS 分析进行研究。制备的钙钛矿用作CO氧化和甲烷燃烧反应的多相催化剂。通过用 Pd 和 Pt 替代 Cu，LMC 催化剂的催化性能显着增强。晶格氧迁移率和比表面积的增强引发了催化性能的提高，在CO氧化和甲烷燃烧中发挥着重要作用。Mn 2p 和 Mn 3s XPS 谱表明，通过在 LMC 钙钛矿中掺杂 Pd 和 Pt，Mn 受到不同状态的影响，并且仅在 LMCPt 催化剂中观察到 Mn 3s 峰。LMCPd1样品的XPS谱显示Pd 3+或Pd 4+的高氧化态，由此可以得出Pd已成功结合到LMC钙钛矿晶格中。LMCPd和LMCPt钙钛矿的H 2 -TPR曲线表明，由于阳离子的协同效应和钯的H 2 溢出效应，通过增加Pd和Pt的部分取代，Cu和Mn的还原峰转移到较低的温度和铂金。
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