期刊
ACS OMEGA
卷 5, 期 38, 页码 24574-24583出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c03075
关键词
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资金
- China Postdoctoral Science Foundation [2017M611473]
- Fundamental Research Funds for the Central Universities [222201917013]
Submicron SSZ-13 with different acidities was synthesized successfully with the assistance of nanosized SSZ-13 seeds. The methanol-to-olefins (MTO) properties of submicron SSZ-13 were evaluated. The lifetime of submicron SSZ-13 was enhanced because of the crystal size reduction. The selectivity of light olefins was improved evidently at the early stage of the MTO reaction as the acidity density decreased. TG, GC-MS, and in situ UV/vis spectra were utilized to investigate coking behavior during the MTO reaction. It was found that the acidity density influences the nature and rate of coke formation. The majority of the hydrocarbon pool species over SSZ-13 with a low acidity density (125.2 mu mol/g) were methylated benzene carbocations, while that over SSZ-13 with a high acidity density (330.2 mu mol/g) were methylated naphthalene carbocations. The low acidity density of SSZ-13 can suppress the hydrogen transfer reaction and polyaromatic generation.
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