US EPA

4796809 

Journal Article 

Carbon nanotube templated synthesis of metal containing hierarchical SAPO-34 catalysts: Impact of the preparation method and metal avidities in the MTO reaction 

Varzaneh, A; Towfighi, J; Sahebdelfar, S 

2016 

1 

Microporous and Mesoporous Materials
ISSN: 1387-1811 

Elsevier 

236 

Elsevier 

1-12 

10.1016/j.micromeso.2016.08.027 

WOS:000385899600001 

https://linkinghub.elsevier.com/retrieve/pii/S1387181116303560
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Hierarchical SAPO-34 was synthesized hydrothermally using carbon nanotube as hard template and modified with Co and Ni by isomorphous substitution and impregnation methods. The prepared catalysts were characterized by XRD, SEM, TEM, XRF, UV vis, NH3-TPD, H-2-TPR, FTIR and N-2 physisorption measurements and their catalytic performance was evaluated for transformation of methanol to light olefins (MTO). There were meaningful differences in terms of crystallinity, acidity, porosity and reducibility among the synthesized catalysts modified by impregnation and isomorphous substitution methods. In addition, the ethylene and propylene yields and the catalytic longevity were strongly dependent on Ni and Co avidities as well as on the modification procedure. The results indicated that compared to the unmodified hierarchical SAPO-34, the catalyst modified with Ni by means of isomorphous substitution improved the yield of ethylene while methane production was promoted over SAPO-34 impregnated with Ni. On the other hand, the Co-containing SAPO-34 samples enhanced the production of both ethylene and propylene relative to the unmodified mesostructured SAPO-34 and these modifications prolonged the catalyst lifetime. These changes in the catalytic behaviors could be ascribed to the changes in the acid sites and porous structure. (C) 2016 Elsevier Inc. All rights reserved. 

Hierarchical SAPO-34; Modification; Cobalt; Nickel; MTO