Experimental study on mass transport mechanism in poly (styrene-co-divinylbenzene) microspheres with hierarchical pore structure
| Autor: | Yongkun Zheng, Ting Qiu, Chen Yang, Qinglian Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Surface diffusion
chemistry.chemical_classification Materials science Process Chemistry and Technology General Chemical Engineering Methyl acetate Diffusion Energy Engineering and Power Technology 02 engineering and technology General Chemistry Polymer Sulfonic acid 010402 general chemistry 021001 nanoscience & nanotechnology Divinylbenzene 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Styrene chemistry.chemical_compound chemistry Chemical engineering 0210 nano-technology Porosity |
| Zdroj: | Chemical Engineering and Processing - Process Intensification. 139:183-192 |
| ISSN: | 0255-2701 |
| Popis: | Catalyst performance is highly relevant to its mass transport performance. In the present study, seven styrene-co-divinylbenzene polymer samples were synthesized by varying the amounts of crosslinker and porogen, so as to elucidate mass transport mechanism in poly (styrene-co-divinylbenzene) microspheres with hierarchical pore structure. Correspondingly, pore structure parameters of seven samples were characterized by BET and MIP. By choosing toluene as probe molecule, surface diffusion coefficient and pore diffusion coefficient of toluene inside the microspheres were measured. The experimental results indicated that both surface diffusion coefficient and pore diffusion coefficient increase with the rise of the ratio of average mesopore diameter to average macropore diameter under a certain porosity. Moreover, the rise of porosity results in greater enhancement of pore diffusion coefficient than surface diffusion coefficient. Finally, sulfonic acid groups were anchored onto polymer microspheres to investigate the relative importance of mass transport performance and catalytic performance by virtue of methyl acetate hydrolysis. |
| Databáze: | OpenAIRE |
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