Advanced characterization for industrial catalysis applications
| Autor: | Sergio I. Sanchez, Lijun Xu, Haiyan Wang, John Q. Chen, Wharton Sinkler, Shelly D. Kelly, Cem Akatay |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Materials science Sulfide chemistry.chemical_element Context (language use) 02 engineering and technology General Medicine 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Sulfur 0104 chemical sciences Catalysis chemistry Catalytic reforming Chemical engineering Physisorption Chemisorption Temperature-programmed reduction 0210 nano-technology |
| Zdroj: | Chinese Journal of Catalysis. 40:1637-1654 |
| ISSN: | 1872-2067 |
| DOI: | 10.1016/s1872-2067(19)63372-3 |
| Popis: | The interplay between analytical technique and industrial practice has been central in the development of catalytic materials for processing petroleum. This article presents reviews of key aspects of two of the most important classes of catalytic materials: noble-metal Pt nanoparticles (NPs) on alumina, which are the basis of catalytic reforming; and layered sulfides of Mo and W, which catalyze hydrogenation and hetero-atom removal in hydroprocessing. The state of understanding of Pt cluster growth and resulting structures, as developed using X-ray absorption spectroscopy and STEM, is reviewed. Influences of both Pt reduction temperature in hydrogen gas, and oxidizing pretreatment conditions prior to Pt reduction, are considered. Recent work by the present authors on Pt NP structure evolution is presented in the context of the previous work. A review is subsequently presented of layered sulfide based NPs, summarizing contributions from a range of analytical techniques. Work on active site structures of sulfide NPs is reviewed, focusing particularly on the critical interactions of active edge sites with sulfur and hydrogen in chemisorption, physisorption, and spillover interactions. New temperature programmed reduction (TPR) results are presented for supported and unsupported sulfide NPs. Structural changes in TPR of alumina-supported MoS2 are investigated using extended X-ray absorption fine structure and density functional theory modeling, and are determined to arise from removal of identifiable edge-site sulfur species. |
| Databáze: | OpenAIRE |
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