Deactivation of Au/CeO2 catalysts during CO oxidation: Influence of pretreatment and reaction conditions

化学 催化作用 X射线光电子能谱 吸附 氧化还原 化学计量学 氧化态 反应机理 多相催化 化学动力学 反应中间体 动力学 无机化学 物理化学 化学工程 有机化学 工程类 物理 量子力学
作者
Ayman Abd El-Moemen,Ali M. Abdel‐Mageed,Joachim Bansmann,Magdalena Parlińska‐Wojtan,R. Jürgen Behm,Gabriela Kučerová
出处
期刊:Journal of Catalysis [Elsevier BV]
卷期号:341: 160-179 被引量:74
标识
DOI:10.1016/j.jcat.2016.07.005
摘要

The influence of the pretreatment on the activity and deactivation behavior of a high surface area 4.5 wt.% Au/CeO2 catalyst during low temperature CO oxidation reaction (Treact = 80 °C) was studied in a multi-technique approach. Furthermore, the influence of changing from a close-to-stoichiometric (1% CO, 1% O2 rest N2), to O2-rich (1% CO, 5% O2 rest N2) and CO-rich (5% CO, 1% O2 rest N2) gas mixtures was investigated. Findings from kinetic and deactivation measurements are correlated with experimental data on the Au particle size, Au and Ce oxidation state, and on the nature of adsorbed species after the different pretreatments and during/after subsequent reaction, which were obtained by operando and in situ methods such as operando X-ray absorption spectroscopy and IR spectroscopy, as well as ex situ X-ray photoelectron spectroscopy, X-ray diffraction and transmission electron microscopy. These data revealed that the pretreatment significantly affects catalyst structure, surface composition and activity in the initial stages of the reaction. During reaction, however, the catalyst surface composition approaches a dynamic equilibrium state, which is largely reached already after 10 min time on stream and which is independent of the pretreatment. Consequently, under present reaction conditions, longer-term deactivation is not dominated by the buildup of site blocking adsorbed species such as surface carbonates, but by slow processes such as reduction/re-oxidation of the bulk support during the reaction in combination with a modest irreversible Au NP growth.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
刚刚
1秒前
1秒前
等待冬亦应助123采纳,获得20
2秒前
Szhou发布了新的文献求助10
3秒前
Owen应助sajdhjas采纳,获得10
4秒前
完美世界应助杨九斤Jenney采纳,获得10
4秒前
5秒前
毛bobi完成签到,获得积分10
5秒前
joe发布了新的文献求助10
6秒前
6秒前
7秒前
aaaaa完成签到,获得积分10
8秒前
8秒前
小树苗完成签到,获得积分10
9秒前
10秒前
老木虫发布了新的文献求助10
10秒前
无花果应助天凉好个秋秋采纳,获得10
11秒前
Jeanie完成签到,获得积分10
11秒前
付志远发布了新的文献求助10
12秒前
12秒前
超级李包包完成签到,获得积分10
12秒前
13秒前
15秒前
小熊宝宝完成签到,获得积分20
16秒前
郭子豪发布了新的文献求助10
16秒前
王星辰发布了新的文献求助10
16秒前
17秒前
17秒前
17秒前
song发布了新的文献求助10
19秒前
慕青应助joe采纳,获得10
20秒前
sajdhjas发布了新的文献求助10
22秒前
22秒前
22秒前
24秒前
和谐的小懒虫完成签到,获得积分10
25秒前
飞在夏夜的猫完成签到,获得积分10
25秒前
25秒前
26秒前
高分求助中
Thinking Small and Large 500
Algorithmic Mathematics in Machine Learning 500
Getting Published in SSCI Journals: 200+ Questions and Answers for Absolute Beginners 300
Deciphering Earth's History: the Practice of Stratigraphy 200
New Syntheses with Carbon Monoxide 200
Quanterion Automated Databook NPRD-2023 200
Interpretability and Explainability in AI Using Python 200
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 物理 生物化学 纳米技术 计算机科学 化学工程 内科学 复合材料 物理化学 电极 遗传学 量子力学 基因 冶金 催化作用
热门帖子
关注 科研通微信公众号,转发送积分 3835045
求助须知:如何正确求助?哪些是违规求助? 3377563
关于积分的说明 10499197
捐赠科研通 3097057
什么是DOI,文献DOI怎么找? 1705466
邀请新用户注册赠送积分活动 820611
科研通“疑难数据库(出版商)”最低求助积分说明 772130