Relationship between Pt particle size and catalyst activity for catalytic oxidation of ultrahigh‐concentration formaldehyde
Relationship between Pt particle size and catalyst activity for catalytic oxidation of ultrahigh‐concentration formaldehyde
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Pt粒径与催化氧化超高浓度甲醛催化剂活性的关系
DOI：
10.1002/aoc.5217
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发表时间：
2019-11
影响因子：
3.9
通讯作者：
Wei Li
中科院分区：
文献类型：
--
作者：
Luyao Ma;Chenxin Liu;Qingxin Guan;Wei Li
研究了Pt/AC催化剂的粒径和催化氧化甲醛的动力学。以活性炭、f-SiO2和MCM-41为载体，采用H2还原法制备了低铂含量的催化剂。Pt/AC催化剂的活性最高，Pt颗粒尺寸最大。相比之下，用KBH 4还原的0.1wt%Pt/AC具有比用H2还原的高得多的活性，其可以在60°C下在固定床反应器中完全氧化超过6000 ppm的HCHO。透射电子显微镜和X射线光电子能谱结果表明，Pt/AC-KBH 4比Pt/AC-H2具有更大的Pt颗粒和更低的价态，这可能归因于Pt 4+与AC载体之间的配体效应。O2程序升温氧化的结果表明，高分散的Pt 4+离子与AC载体的相互作用更强，更难被H2还原。此外，Pt/AC是结构敏感的，较大尺寸的Pt颗粒导致HCHO的高转化率。动力学研究表明，对于Pt/AC-KBH 4，在如此高的HCHO浓度条件下，其为零级反应。
The effects of particle size and kinetics of Pt/activated carbon (AC) catalysts on catalytic oxidation of formaldehyde (HCHO) were investigated. AC, f‐SiO2and MCM‐41 were used as supports to prepare low‐Pt‐content catalysts using H2reduction. Pt/AC catalyst shows the highest activity with the largest Pt particle size. By contrast, 0.1 wt% Pt/AC reduced using KBH4has much higher activity than that reduced using H2, which can oxidize HCHO completely over 6000 ppm at 60°C in a fixed bed reactor. Transmission electron microscopy and X‐ray photoelectron spectroscopy results indicate that Pt/AC‐KBH4has larger Pt particles and lower valence state than Pt/AC‐H2, which may be attributed to the ligand effect between Pt4+and the AC support. The result of O2temperature‐programmed oxidation suggests that highly dispersed Pt4+ions have stronger interaction with AC support and thus are harder to be reduced by H2. Furthermore, Pt/AC is structure‐sensitive and larger‐sized Pt particles result in a high conversion of HCHO. Investigation of kinetics indicated that it is a zero‐order reaction for such a high HCHO concentration condition for Pt/AC‐KBH4.
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影响因子：
22.1
作者：
Zhang, Changbin;He, Hong;Tanaka, Ken-ichi
通讯作者：
Tanaka, Ken-ichi
DOI：
10.1183/09059180.00000714
发表时间：
2015-03
期刊：
European respiratory review : an official journal of the European Respiratory Society
影响因子：
--
作者：
通讯作者：
--
影响因子：
10.9
作者：
Rodriguez-Reinoso, F
通讯作者：
Rodriguez-Reinoso, F
用于气态甲醛氧化的高度分散和活性负载的 Pt 纳米粒子：粒径的影响
影响因子：
15.1
作者：
Huang, Haibao;Hu, Peng;Leung, Dennis Y. C.
通讯作者：
Leung, Dennis Y. C.
影响因子：
7.3
作者：
Beck, Irene E.;Bukhtiyarov, Valerii I.;Parmon, Valentin N.
通讯作者：
Parmon, Valentin N.