Hollownano-MgF2 supported catalysts: Highly active and stable in gas-phase dehydrofluorination of 1,1,1,3,3-pentafluoropropane

催化作用 煅烧 路易斯酸 选择性 吡啶 X射线光电子能谱 材料科学 介孔材料 金属 甲苯 多元醇 比表面积 水溶液中的金属离子 纳米- 化学工程 核化学 无机化学 化学 聚氨酯 有机化学 复合材料 冶金 工程类
作者
Zhaohua Jia,Wei Mao,Yanbo Bai,Bo Wang,Hui Ma,Chen Li,Jian Lü
出处
期刊:Applied Catalysis B-environmental [Elsevier]
卷期号:238: 599-608 被引量:22
标识
DOI:10.1016/j.apcatb.2018.07.067
摘要

In this work, different metal ions (Al3+, Cr3+, Fe3+, Co3+, Zn2+, Ni2+) were supported on a hollow nano-MgF2 to catalyze gas-phase dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa) to 1,3,3,3-tetrafluoropropene (HFO-1234ze). The support, hollow nano-MgF2 prepared by a polyol mediated sol-gel method possesses large surface area (127 m2 g−1) and mesoporous structure (12 nm) with weak Lewis acidity after calcination at 350 °C. The catalysts were characterized by TEM, XRD, BET, NH3-TPD, EDX, pyridine-IR and XPS. The physicochemical characterization showed via simple impregnation with different metal ions, the textural and surface acidic properties of hollow nano-MgF2 were tuned, while the hollow nanosphere structure were maintained. The introduction of Al on hollow nano-MgF2 has resulted in higher catalyst activity and selectivity to desired product, trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) than the other catalysts due to its largest surface area and numerous Lewis acid sites. The combination of the results of acidic properties and activity testing showed that the number of medium acid sites appeared to have a linear influence on the activity of hollow nano-MgF2 supported catalysts. The highest activity with HFC-245fa conversion of 54% and 82% selectivity to HFO-1234ze(E) was obtained at 280 °C on hollow nano-MgF2 supported 9 mol.% Al catalyst (9%Al/nano-MgF2), which also exhibited almost constant catalytic performances over 200 h. Surface Al species of Al/nano-MgF2 catalysts were identified, including Al(OH)xFy/AlOxFy, β-AlF3 and α-AlF3. The relative abundance of Al(OH)xFy/AlOxFy species was found to be highly correlated with the catalyst activity. The catalytic performances of 9%Al/nano-MgF2 are significantly higher than those of traditional AlF3 and fluorinated Cr2O3 for gas-phase dehydrofluorination reactions.
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
大幅提高文件上传限制,最高150M (2024-4-1)

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
g_f发布了新的文献求助10
刚刚
令狐擎宇完成签到,获得积分10
1秒前
1秒前
2秒前
kk应助大可采纳,获得10
2秒前
kai发布了新的文献求助10
3秒前
4秒前
Yue完成签到 ,获得积分10
4秒前
JamesPei应助云生雾霭采纳,获得10
5秒前
5秒前
5秒前
5秒前
孔刚完成签到 ,获得积分10
6秒前
g_f完成签到,获得积分10
9秒前
喜悦小猫咪完成签到,获得积分10
9秒前
jmchen发布了新的文献求助10
9秒前
9秒前
z.发布了新的文献求助10
10秒前
lihui发布了新的文献求助10
11秒前
11秒前
科研通AI2S应助Lil_H采纳,获得10
11秒前
我服有点黑给36456657的求助进行了留言
11秒前
12秒前
零度空间完成签到,获得积分10
12秒前
12秒前
5165asd完成签到,获得积分10
13秒前
13秒前
14秒前
gyhmm发布了新的文献求助10
14秒前
yatou5651应助XSCOOP采纳,获得30
14秒前
ran发布了新的文献求助10
15秒前
16秒前
霜霜发布了新的文献求助10
16秒前
Yue关注了科研通微信公众号
16秒前
小张张完成签到,获得积分20
16秒前
lxland1219发布了新的文献求助10
19秒前
lihui完成签到,获得积分10
19秒前
20秒前
小蘑菇应助CNSSCI采纳,获得10
21秒前
wy18567337203发布了新的文献求助10
21秒前
高分求助中
The late Devonian Standard Conodont Zonation 2000
Nickel superalloy market size, share, growth, trends, and forecast 2023-2030 2000
The Lali Section: An Excellent Reference Section for Upper - Devonian in South China 1500
Very-high-order BVD Schemes Using β-variable THINC Method 870
Mantiden: Faszinierende Lauerjäger Faszinierende Lauerjäger 800
PraxisRatgeber: Mantiden: Faszinierende Lauerjäger 800
Fundamentals of Dispersed Multiphase Flows 500
热门求助领域 (近24小时)
化学 医学 生物 材料科学 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 基因 遗传学 催化作用 物理化学 免疫学 量子力学 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 3254506
求助须知:如何正确求助?哪些是违规求助? 2896643
关于积分的说明 8293717
捐赠科研通 2565614
什么是DOI,文献DOI怎么找? 1393195
科研通“疑难数据库(出版商)”最低求助积分说明 652443
邀请新用户注册赠送积分活动 629992