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• 作者：Aman Pandey ; Gunisha Jain ; Divya Vyas ; Silvia IrustaSudhanshu Sharma
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：121
• 期：1
• 页码：481-489
• 全文大小：546K
• ISSN：1932-7455

文摘

This paper describes one-pot solution combustion synthesis of La_2–xSb_xO₃ (0.02 ≤ x ≤ 0.10). Detailed characterization using X-ray diffraction (XRD) and X- ray photoelecron spectroscopy (XPS) is carried out to understand the doping effect and the oxidation state of antimony. Further, temperature-programmed desorption (TPD) with CO₂ is performed for evaluating the basic property and temperature-programmed reduction (TPR) with H₂ has been employed to obtain the oxygen storage capacity. The comparative study of La₂O₃, La_2–xSb_xO₃ (0.02 ≤ x ≤ 0.10) shows that as the concentration of Sb increases, the basicity decreases and the oxygen storage capacity increases. Thus, nonreducible and basic La₂O₃ can be transformed to significantly reducible and acidic La_2–xSb_xO₃ (0.02 ≤ x ≤ 0.10). Further, solid state UV spectroscopy shows that due to the antimony doping, band gap of La₂O₃ decreases significantly. Moreover, antimony doping also modifies the support property of La₂O₃ as demonstrated in the catalytic CO₂ methanation reaction in the presence of hydrogen. Ru-doped La₂O₃ and La_1.96Sb_0.04O₃ shows different selectivity toward methane formation and the later favors the reverse water gas shift reaction.