US EPA

4761416 

Journal Article 

Thorough study of the effect of metal-incorporated SAPO-34 molecular sieves on catalytic performances in MTO process 

Sedighi, M; Ghasemi, M; Sadeqzadeh, M; Hadi, M 

2016 

1 

Powder Technology
ISSN: 0032-5910 

Elsevier 

291 

Elsevier 

131-139 

10.1016/j.powtec.2015.11.066 

WOS:000370900900015 

https://linkinghub.elsevier.com/retrieve/pii/S0032591015302096
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SAPO-34 and MeAPS0-34s (Me = Fe, Co, Ni, La and Ce) molecular sieves were synthesized and used as catalysts for conversion of methanol to light olefins. X-ray diffraction, scanning electron microscopy, nitrogen adsorption desorption inductively coupled plasma mass spectrometry, Fourier transform infrared spectroscopy and temperature programmed desorption techniques were used to characterize the synthesized catalysts. Thermogravimetric analysis was used to investigate the amount of coke deposited on the spent catalysts during the reaction. The synthesized MeAPS0-34s had the same chabazite topology structure, while metal incorporation gave rise to the different micropore area and acidity. All the SAPO-34 and MeAPS0-34 molecular sieves were very active and selective catalyst for light olefins production. Metal incorporation improved the catalyst lifetime and favored the ethylene and propylene product. Concerning the yield of light olefins at 425 C and 1 bar, NiAPSO-34 favored ethylene production and CeAPSO-34 and LaAPSO-34 were helpful for propylene production. Light olefins yield decreased with time on stream for all the samples; although, this decrease rate is lower for MeAPS0-34 than for the parent SAPO-34. The catalyst lifetime increased in an order as follows: Ce- > La- > Co- > Ni- > Fe- > SAPO-34. The rare earth modified catalysts exhibited lower methanation than parent SAPO-34 and transition metal modified catalysts. (C) 2015 Elsevier B.V. All rights reserved. 

SAPO-34; MeAPSO-34; Light olefins; Characterization; Lifetime