A novel non-stoichiometric Y_xInO_3+δ (YIO-x, 0.8 ≤ x ≤ 1.04) perovskite catalyst with a large number of oxygen vacancies and high specific surface area was synthesized using glycine self-propagating gel combustion. It was found that low levels of non-stoichiometry in the A site of Y_xInO_3+δ effectively increased the amount of oxygen desorption by 39–42% when compared to the original (YIO-1) due to Y-deficiency and oxygen vacancies. Further investigations showed that the non-stoichiometry also brings a significant change to the Lewis acid sites on the surface of the sample, which confirmed to be a great promoter for the catalytic combustion of methane. In addition, the catalytic performance increased with the increasing intensity of acid sites. After 50 h of the stability test, the catalysts maintained high activity, indicating their good catalytic stability.

中文翻译：

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Y _x InO _{3+ δ}中A位非化学计量对甲烷燃烧过程中催化性能的影响

一种新颖的非化学计量的ý _X INO _{3+ δ}（YIO- X，0.8≤ X ≤1.04）钙钛矿具有大量的氧空位和高比表面积的催化剂，使用甘氨酸自蔓延燃烧凝胶合成。发现Y _x InO _{3+ δ}的A位点的非化学计量水平低由于缺乏Y和缺氧，与原始（YIO-1）相比，有效地将氧气的解吸量提高了39–42％。进一步的研究表明，非化学计量也使样品表面的路易斯酸位发生了重大变化，这被证实是甲烷催化燃烧的重要促进剂。另外，催化性能随酸性位点强度的增加而增加。稳定性测试50小时后，催化剂保持高活性，表明它们具有良好的催化稳定性。