期刊
RSC ADVANCES
卷 6, 期 39, 页码 32523-32533出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra03039d
关键词
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资金
- National Natural Science Foundation of China [U1162112, 21576082]
- Science and Technology Commission of Shanghai Municipality [13DZ2275200]
- China Postdoctoral Science Foundation [2015M580299]
- Fundamental Research Funds for the Central Universities [1514011]
Integrating hierarchical porosity over microporous zeotype materials is an effective way to promote their mass transfer properties and catalytic performances. A combined synthetic strategy using small molecular growth inhibitor 1,2,3-hexanetriol and tumbling crystallization condition to generate hierarchically organized SAPO-11 is herein presented. The addition of 1,2,3-hexanetriol in the synthetic gel of SAPO-11 under agitating conditions significantly altered its crystallization behaviour, resulting in the formation of a hierarchically organized architecture. An underlying nonclassical from-shell-to-core crystallization has been disclosed by time-dependent observation of the formation process. The hierarchically self-organized structure has been characterized by a suite of characterization techniques, such as XRD, N-2 physisorption, SEM, TEM, mercury intrusion measurements, Al-27, Si-29, P-31 MAS NMR and pyridine adsorption IR (Py-IR). The structure featuring barrel-shaped architecture is comprised of aligned 300-400 nm primary building blocks with voids in between, constructing an auxiliary macro-/mesopore system open to external surfaces. The catalytic performance of Pt supported on hierarchical SAPO-11 in n-heptane hydroisomerization has been assessed, showing that both catalytic activity and isomer yield have been increased with respect to a conventional sample. As the acidity for the hierarchical SAPO-11 is comparable to the conventional sample, the enhancement in catalytic performance is attributed to the small primary crystal size and macro-/meso-pore-connectivity, that are important for mass transfer.
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