Guo, Z;
Li, X;
Hu, S;
Ye, G;
Zhou, X;
Coppens, M;
(2020)
Understanding the Role of Internal Diffusion Barriers in Pt/Beta Zeolite Catalyzed Isomerization of n‐Heptane.
Angewandte Chemie
, 132
(4)
pp. 1564-1567.
10.1002/ange.201913660.
Preview |
Text
Revised_Manuscript_AngewChem19_Final.pdf - Accepted Version Download (1MB) | Preview |
Abstract
Applications of zeolites in catalysis are plagued by strong diffusion resistance, which results from limitations to molecular transport in micropores, across external crystal surfaces, but also across internal interfaces. The first type of diffusion resistance is well understood, the second is receiving increasing attention, while the diffusion barriers at internal interfaces remain largely unclear. We take Pt/Beta catalyzed isomerization of n‐heptane as the model system to explore the role of internal diffusion barriers in zeolite catalysis. The two as‐synthesized Pt/Beta catalysts have an identical Pt loading, similar Beta particle size and acidity, but different internal structures. A Pt/Beta crystal with no observable internal interfaces can be 180 % higher in activity and 22 % higher in selectivity than its counterpart with numerous internal interfaces. This can only be attributed to the strong transport barriers across internal interfaces, as supported by directly comparing the apparent diffusivities of the two Beta samples.
| Type: | Article |
|---|---|
| Title: | Understanding the Role of Internal Diffusion Barriers in Pt/Beta Zeolite Catalyzed Isomerization of n‐Heptane |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/ange.201913660 |
| Publisher version: | https://doi.org/10.1002/ange.201913660 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Grenzflächen, Diffusionsbarrieren, n-Heptane, Pt/Beta-Zeolith, Zeolithkatalyse |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10088911 |
Archive Staff Only
 |
View Item |
