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Synthesis of palygorskite-supported Mn 1−x Ce x O 2 clusters and their performance in catalytic oxidation of formaldehyde
Applied Clay Science ( IF 5.6 ) Pub Date : 2018-06-01 , DOI: 10.1016/j.clay.2017.08.023
Can Wang , Haibo Liu , Tianhu Chen , Chengsong Qing , Xuehua Zou , Jingjing Xie , Xiaori Zhang

Abstract Nano-scale Mn 1 − x Ce x O 2 catalysts supported on palygorskite (PG) with different dopant fractions were prepared by the co-precipitation method and applied in the catalytic oxidation of formaldehyde (HCHO). The obtained samples were characterized using BET, XRD, Raman spectroscopy, TEM, EDS, and H 2 -TPR to illustrate the physicochemical properties of the catalysts. After the introduction of cerium, the growth of manganese oxide was inhibited. However, an increase of the Ce/(Ce + Mn) ratio from 0.1 to 0.5 increased the particle size from 2.87 to 6.86 nm. A remarkable interface (grain boundaries) between MnO 2 and CeO 2 was observed, especially for low cerium molar fractions (0.1–0.4). The doping of cerium significantly enhanced the activity of manganese oxide for HCHO oxidation at 100–180 °C. The Mn 0.9 Ce 0.1 /PG catalyst exhibited the best activity, and HCHO was completely converted to CO 2 and H 2 O at 160 °C. The characterization results indicated that smaller particle size, surface-adsorbed oxygen species and abundant oxygen vacancies accounted for the high catalytic activity of the Mn 0.9 Ce 0.1 /PG catalyst for HCHO conversion. In addition, the Mn 0.9 Ce 0.1 /PG catalyst also displayed high stability in lifetime testing and excellent water-resistant performance. The experimental results suggest that palygorskite-supported Mn 0.9 Ce 0.1 is a promising catalyst for the catalytic oxidation of formaldehyde at low temperatures.

中文翻译:

坡缕石负载Mn 1−x Ce x O 2 簇的合成及其催化氧化甲醛性能

摘要 采用共沉淀法制备了不同掺杂比例的坡缕石(PG)负载纳米级Mn 1 - x Ce x O 2 催化剂,并将其应用于甲醛(HCHO)的催化氧化。使用 BET、XRD、拉曼光谱、TEM、EDS 和 H 2 -TPR 对获得的样品进行表征,以说明催化剂的物理化学性质。引入铈后,氧化锰的生长受到抑制。然而,Ce/(Ce + Mn) 比值从 0.1 增加到 0.5 会使粒径从 2.87 增加到 6.86 nm。观察到 MnO 2 和 CeO 2 之间的显着界面(晶界),特别是对于低铈摩尔分数 (0.1-0.4)。铈的掺杂显着提高了氧化锰在 100-180°C 时氧化 HCHO 的活性。Mn 0.9 Ce 0. 1 /PG催化剂表现出最好的活性,HCHO在160℃下完全转化为CO 2 和H 2 O。表征结果表明,较小的粒径、表面吸附的氧物种和丰富的氧空位是Mn 0.9 Ce 0.1 /PG 催化剂对HCHO 转化的高催化活性。此外,Mn 0.9 Ce 0.1 /PG 催化剂在寿命测试中也表现出高稳定性和优异的防水性能。实验结果表明,坡缕石负载的Mn 0.9 Ce 0.1 是一种很有前景的低温催化氧化甲醛催化剂。表面吸附的氧物种和丰富的氧空位解释了 Mn 0.9 Ce 0.1 /PG 催化剂对 HCHO 转化的高催化活性。此外,Mn 0.9 Ce 0.1 /PG 催化剂在寿命测试中也表现出高稳定性和优异的防水性能。实验结果表明,坡缕石负载的Mn 0.9 Ce 0.1 是一种很有前景的低温催化氧化甲醛催化剂。表面吸附的氧物种和丰富的氧空位解释了 Mn 0.9 Ce 0.1 /PG 催化剂对 HCHO 转化的高催化活性。此外,Mn 0.9 Ce 0.1 /PG 催化剂在寿命测试中也表现出高稳定性和优异的防水性能。实验结果表明,坡缕石负载的Mn 0.9 Ce 0.1 是一种很有前景的低温催化氧化甲醛催化剂。
更新日期:2018-06-01
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