Synthesis and application of HZSM-5@silicalite-1 core-shell composites for the generation of light olefins from CH3Br

Na Li; Ying Ying Zhang; Lang Chen; Chak Tong Au; Shuang Feng Yin

doi:10.1016/j.micromeso.2016.02.017

Synthesis and application of HZSM-5@silicalite-1 core-shell composites for the generation of light olefins from CH₃Br

Na Li, Ying Ying Zhang, Lang Chen, Chak Tong Au, Shuang Feng Yin^*

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

28 Citations (Scopus)

Abstract

To improve activity and hinder deactivation, nonacidic polycrystalline silicalite-1 was contiguously coated on HZSM-5 to yield HZSM-5@silicalite-1 composites using a hydrothermal synthesis method. The obtained samples were examined as catalysts for the generation of light olefins (ethylene and propylene) from CH₃Br, and found to show high catalytic activity, stability and high selectivity to the desired products. The excellent performance is attributed to the silicalite-1 shell which causes passivation of acid sites on the external surface of HZSM-5. It was observed that the HZSM-5@silicalite-1 composite with thicker coating (ZS-2) shows much higher stability and selectivity to light olefins (up to 80%) than that with thinner coating (ZS-1), indicating that the surface of HZSM-5 crystals of the latter was less covered. Based on the characterization results, it is deduced that the catalytic stability of ZS-2 is due to the silicalite-1 shell that hinders HZSM-5 from deactivation as a result of surface coking.

Original language	English
Pages (from-to)	76-80
Number of pages	5
Journal	Microporous and Mesoporous Materials
Volume	227
DOIs	https://doi.org/10.1016/j.micromeso.2016.02.017
Publication status	Published - Jun 2016

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HZSM-5
HZSM-5@silicalite-1 composite
Light olefins
Natural gas

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10.1016/j.micromeso.2016.02.017

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title = "Synthesis and application of HZSM-5@silicalite-1 core-shell composites for the generation of light olefins from CH3Br",

abstract = "To improve activity and hinder deactivation, nonacidic polycrystalline silicalite-1 was contiguously coated on HZSM-5 to yield HZSM-5@silicalite-1 composites using a hydrothermal synthesis method. The obtained samples were examined as catalysts for the generation of light olefins (ethylene and propylene) from CH3Br, and found to show high catalytic activity, stability and high selectivity to the desired products. The excellent performance is attributed to the silicalite-1 shell which causes passivation of acid sites on the external surface of HZSM-5. It was observed that the HZSM-5@silicalite-1 composite with thicker coating (ZS-2) shows much higher stability and selectivity to light olefins (up to 80%) than that with thinner coating (ZS-1), indicating that the surface of HZSM-5 crystals of the latter was less covered. Based on the characterization results, it is deduced that the catalytic stability of ZS-2 is due to the silicalite-1 shell that hinders HZSM-5 from deactivation as a result of surface coking.",

keywords = "HZSM-5, HZSM-5@silicalite-1 composite, Light olefins, Natural gas",

author = "Na Li and Zhang, {Ying Ying} and Lang Chen and Au, {Chak Tong} and Yin, {Shuang Feng}",

note = "Funding Information: The project was financially supported by the National Natural Science Foundation of China (Grant Nos. 21273067 , 21476065 ). Program for Changjiang Scholars and Innovative Research Team in University ( IRT1238 ). ",

year = "2016",

month = jun,

doi = "10.1016/j.micromeso.2016.02.017",

language = "English",

volume = "227",

pages = "76--80",

journal = "Microporous and Mesoporous Materials",

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T1 - Synthesis and application of HZSM-5@silicalite-1 core-shell composites for the generation of light olefins from CH3Br

AU - Li, Na

AU - Zhang, Ying Ying

AU - Chen, Lang

AU - Au, Chak Tong

AU - Yin, Shuang Feng

N1 - Funding Information: The project was financially supported by the National Natural Science Foundation of China (Grant Nos. 21273067 , 21476065 ). Program for Changjiang Scholars and Innovative Research Team in University ( IRT1238 ).

PY - 2016/6

Y1 - 2016/6

N2 - To improve activity and hinder deactivation, nonacidic polycrystalline silicalite-1 was contiguously coated on HZSM-5 to yield HZSM-5@silicalite-1 composites using a hydrothermal synthesis method. The obtained samples were examined as catalysts for the generation of light olefins (ethylene and propylene) from CH3Br, and found to show high catalytic activity, stability and high selectivity to the desired products. The excellent performance is attributed to the silicalite-1 shell which causes passivation of acid sites on the external surface of HZSM-5. It was observed that the HZSM-5@silicalite-1 composite with thicker coating (ZS-2) shows much higher stability and selectivity to light olefins (up to 80%) than that with thinner coating (ZS-1), indicating that the surface of HZSM-5 crystals of the latter was less covered. Based on the characterization results, it is deduced that the catalytic stability of ZS-2 is due to the silicalite-1 shell that hinders HZSM-5 from deactivation as a result of surface coking.

AB - To improve activity and hinder deactivation, nonacidic polycrystalline silicalite-1 was contiguously coated on HZSM-5 to yield HZSM-5@silicalite-1 composites using a hydrothermal synthesis method. The obtained samples were examined as catalysts for the generation of light olefins (ethylene and propylene) from CH3Br, and found to show high catalytic activity, stability and high selectivity to the desired products. The excellent performance is attributed to the silicalite-1 shell which causes passivation of acid sites on the external surface of HZSM-5. It was observed that the HZSM-5@silicalite-1 composite with thicker coating (ZS-2) shows much higher stability and selectivity to light olefins (up to 80%) than that with thinner coating (ZS-1), indicating that the surface of HZSM-5 crystals of the latter was less covered. Based on the characterization results, it is deduced that the catalytic stability of ZS-2 is due to the silicalite-1 shell that hinders HZSM-5 from deactivation as a result of surface coking.

KW - HZSM-5

KW - HZSM-5@silicalite-1 composite

KW - Light olefins

KW - Natural gas

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U2 - 10.1016/j.micromeso.2016.02.017

DO - 10.1016/j.micromeso.2016.02.017

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AN - SCOPUS:84960121020

SN - 1387-1811

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ER -

Synthesis and application of HZSM-5@silicalite-1 core-shell composites for the generation of light olefins from CH₃Br

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