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Issue 8, 2019
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Synthesis of sub-micrometric SAPO-34 by a morpholine assisted two-step hydrothermal route and its excellent MTO catalytic performance

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Abstract

SAPO-34 with a sub-micrometer crystal size was synthesized by a double hydrothermal treatment employing cost-effective morpholine as a structure directing agent, which presented an enhanced catalytic lifetime (nearly 3 times the conventional one) in the reaction of methanol to olefins with a higher light olefin selectivity (total selectivity of 97.1%). Detailed studies of the sample after different time intervals in the second crystallization with and without additional morpholine were carried out, which offered insight into crystal degradation and re-crystallization phenomena. The samples with different morpholine concentrations during the second hydrothermal treatment were also prepared, in which the sample with 80% MOR aqueous solution exhibited the smallest crystal size and the longest MTO lifetime. Furthermore, the investigation on the additional amount of mother liquor (from the first crystallization) required for the second crystallization showed that the presence of half the amount of the mother liquor (nutrients) could give us the required results effectively.

Graphical abstract: Synthesis of sub-micrometric SAPO-34 by a morpholine assisted two-step hydrothermal route and its excellent MTO catalytic performance

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Publication details

The article was received on 17 Nov 2018, accepted on 24 Jan 2019 and first published on 24 Jan 2019


Article type: Paper
DOI: 10.1039/C8DT04559C
Citation: Dalton Trans., 2019,48, 2606-2616

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    Synthesis of sub-micrometric SAPO-34 by a morpholine assisted two-step hydrothermal route and its excellent MTO catalytic performance

    S. U. H. Bakhtiar, S. Ali, X. Wang, F. Yuan, Z. Li and Y. Zhu, Dalton Trans., 2019, 48, 2606
    DOI: 10.1039/C8DT04559C

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