Phase transformation and oxygen vacancies in Pd/ZrO2 for complete methane oxidation under lean conditions

催化作用 煅烧 化学 四方晶系 氧气 甲烷 氧气储存 无机化学 氧化物 多相催化 甲烷厌氧氧化 整体 化学工程 相(物质) 有机化学 工程类
作者
Yang Wu,Jianjun Chen,Wei Hu,Kun Zhao,Pengfei Qu,Puqing Shen,Ming Zhao,Lin Zhong,Yaoqiang Chen
出处
期刊:Journal of Catalysis [Elsevier BV]
卷期号:377: 565-576 被引量:94
标识
DOI:10.1016/j.jcat.2019.04.047
摘要

A series of ZrO2 materials were prepared by calcining ZrO2·xH2O at temperatures from 600 to 900 °C. The oxide materials were used to prepare Pd/ZrO2 catalysts coated on the monolith. Under lean conditions, the monolithic catalysts were tested for complete oxidation of CH4 in the presence and absence of water. In process of the preparation of supports, the ratio of monoclinic ZrO2 (m-ZrO2) to tetragonal ZrO2 (t-ZrO2) increased with calcination temperature. Strong interaction between palladium and ZrO2 further induced the transformation of t-ZrO2 to m-ZrO2 when supporting Pd on ZrO2. Phase transformation in samples including ZrO2 supports and Pd/ZrO2 catalysts was accompanied by an increase in the concentration of surface oxygen vacancies, improving the mobility of oxygen species over the samples. It was found that the Pd catalyst using ZrO2 calcined at 900 °C as the support had the highest oxygen vacancy concentration among the four catalysts as synthesized. Under dry reaction conditions, this catalyst showed considerably higher activity in methane oxidation promoted by oxygen vacancies. However, under wet reaction conditions (10 vol% H2O), water poisoned the surface-active sites for all the catalysts. The promoting effect of increasing oxygen vacancies on the activity of CH4 oxidation was thus weakened significantly by the water poisoning, resulting in slight differences in activity among the catalysts.
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
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

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
玲℃完成签到,获得积分10
刚刚
熊大发布了新的文献求助10
刚刚
LUCA发布了新的文献求助10
1秒前
搞怪莫茗发布了新的文献求助10
1秒前
2秒前
2秒前
彭于晏应助weerfi采纳,获得10
2秒前
隐形曼青应助正在进行时采纳,获得10
3秒前
海东来应助高大的天道采纳,获得50
3秒前
开放飞阳完成签到,获得积分10
3秒前
科研通AI2S应助帅气凝云采纳,获得10
3秒前
Deny完成签到,获得积分10
3秒前
orixero应助Elliot_315采纳,获得10
3秒前
4秒前
4秒前
sugar完成签到,获得积分10
4秒前
JamesPei应助张灬小胖采纳,获得10
5秒前
王小小完成签到,获得积分10
5秒前
Cheung2121完成签到,获得积分20
5秒前
6秒前
6秒前
kelly完成签到,获得积分10
6秒前
共享精神应助JM采纳,获得10
6秒前
坦率的匪举报111求助涉嫌违规
7秒前
长情的千风完成签到,获得积分10
7秒前
7秒前
woshiwuziq完成签到 ,获得积分10
8秒前
anna1992发布了新的文献求助10
9秒前
YY完成签到,获得积分10
9秒前
符宇新发布了新的文献求助10
9秒前
iNk应助kk采纳,获得10
10秒前
小马甲应助有机分子笼采纳,获得10
10秒前
10秒前
10秒前
张文静发布了新的文献求助30
10秒前
沉默的小天鹅应助xiaose采纳,获得10
11秒前
章宇完成签到,获得积分10
11秒前
充电宝应助123采纳,获得10
12秒前
想喝冰美完成签到,获得积分10
12秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Handbook of Marine Craft Hydrodynamics and Motion Control, 2nd Edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
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 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3987078
求助须知:如何正确求助?哪些是违规求助? 3529488
关于积分的说明 11245360
捐赠科研通 3267987
什么是DOI,文献DOI怎么找? 1804013
邀请新用户注册赠送积分活动 881270
科研通“疑难数据库(出版商)”最低求助积分说明 808650