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首页> 外文期刊>Journal of industrial and engineering chemistry >Activity, selectivity, and stability of vanadium catalysts in formaldehyde production from emissionsof volatile organic compounds
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Activity, selectivity, and stability of vanadium catalysts in formaldehyde production from emissionsof volatile organic compounds

机译：从挥发性有机化合物发射的甲醛生产中钒催化剂的活性，选择性和稳定性

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摘要

In this study, activity, selectivity and stability of vanadium catalysts supported on zirconia, hafnia, and alumina were examined in the oxidation of methanethiol and methanol to formaldehyde. The 3 wt-% vanadia-alumina catalyst with low VOx surface density showed the highest activity in the formaldehyde production. However, during the stability test, this catalyst deactivated due to the change in the oxidation state of vanadium from V5+ to V4+, decrease the amount of surface vanadium species and the formation of sulphates on the material surface. Zirconia and hafnia supported catalysts with high VOx surface density demonstrated better stability in the reaction conditions, but their activity in the formaldehyde production was lower. One reason for the lower activity might be the formation of metal-mixed oxide phases between vanadia and the support, which could also explain the decreased sulphur deposition on zirconia and hafnia after vanadium impregnation. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：在本研究中，在氧乙二醇和甲醇氧化至甲醛的氧化物中，在氧化锆，铪和氧化铝上负载的钒催化剂的活性，选择性和稳定性。具有低vox表面密度的3wt-％丙基 - 氧化铝催化剂在甲醛生产中显示出最高的活性。然而，在稳定性测试期间，这种催化剂由于V5 +至V4 +的钒的氧化状态的变化而停用，降低了表面钒物种的量和在材料表面上形成硫酸盐。氧化锆和哈夫尼亚支持高VOX表面密度的催化剂在反应条件下表现出更好的稳定性，但它们在甲醛生产中的活性较低。较低活性的一个原因可能是钒腈和载体之间的金属混合氧化阶段的形成，这也可以解释钒浸渍后氧化锆和哈夫尼亚的硫沉积降低。 （c）2019年韩国工程化学学会。 elsevier b.v出版。保留所有权利。

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