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Effects of nanosheet catalysts on synthesis of aromatics and light hydrocarbons from acetylene

Authors
Lee, TaeheeBae, YeongkwangJeon, JonghyunKim, JuchanChoi, JungkyuHa, Kyoung-Su
Issue Date
1-8월-2020
Publisher
ELSEVIER
Keywords
Aromatization; Acetylene; Light hydrocarbons; ITQ-2; Nanosheet zeolite
Citation
CATALYSIS TODAY, v.352, pp.183 - 191
Indexed
SCIE
SCOPUS
Journal Title
CATALYSIS TODAY
Volume
352
Start Page
183
End Page
191
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/53813
DOI
10.1016/j.cattod.2020.01.004
ISSN
0920-5861
Abstract
A nanosheet zeolite ITQ-2 formed by delamination of MCM-22 zeolite precursor was used and tested as a catalyst for the aromatization of acetylene. Along with MCM-22 (calcined form of MCM-22 zeolite precursor) zeolites, the resulting materials were successfully prepared and characterized in terms of pore structure and surface property. The performance of aromatization of ITQ-2 zeolites was comparable to that of MCM-22 zeolites. Due to the isolated and thin-layer structure, ITQ-2 zeolites had a significant fraction of external active sites. This feature seemed to result in relatively higher amount of C3-C8 aliphatic compounds rather than the C6-C8 aromatic compounds because of the shortened residence and, thus, reaction time. We first found that the cumulative C3-C8 aliphatic products in the case of ITQ-2 zeolites increased with the amounts of external surface area, while no clear relation was observed for the case of MCM-22 zeolites. Second, the initial selectivity towards aromatics was found to clearly show a linear relation with the concentration of Bronsted acid sites regardless of the used catalyst. In addition, the nanosheet ITQ-2 zeolites showed a much slower deactivation unlike the traditional microporous MCM-22 zeolites. Finally, to investigate the difference in the catalytic performance, we rebuilt the reaction pathways from acetylene to the aromatics and aliphatics.
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공과대학 (화공생명공학과)
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