Synthesis of Low Silica SAPO‐34 by In Situ Pretreatment and Its Catalytic Performance in the Methanol‐to‐Olefins (MTO) Reaction

A series of low‐silica SAPO‐34 molecular sieves with a tunable silica content were synthesized through a facile in situ pretreatment strategy under different pretreatment condition. The effects of the pretreatment condition on the crystal phases, chemical composition, morphology and acidity of SAPO‐...

Full description

Saved in:
Bibliographic Details
Published in:European journal of inorganic chemistry 2023-03, Vol.26 (9), p.n/a
Main Authors: Guo, Lei, Zhu, Weiping, Xing, Aihua, Li, Fei
Format: Article
Language:English
Subjects:
Acidity
Alkenes
Aluminum
Ammonia
Chemical composition
Heterogeneous catalysis
Inorganic chemistry
Low silica materials
Molecular sieves
NMR spectroscopy
Pretreatment
Propylene
Reaction mechanisms
SAPO-34
Selectivity
Silicon dioxide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A series of low‐silica SAPO‐34 molecular sieves with a tunable silica content were synthesized through a facile in situ pretreatment strategy under different pretreatment condition. The effects of the pretreatment condition on the crystal phases, chemical composition, morphology and acidity of SAPO‐34 were characterized by XRD, XRF, SEM, N2 adsorption‐desorption, NH3‐TPD and 29Si MAS NMR. The obtained low‐silica SAPO‐34 exhibits higher catalytic performance in the MTO reaction than conventional SAPO‐34 due to the moderate acidity and larger surface areas. Sample S4 with a Si content of Si/(Si+Al+P)=0.053 showed the prolonged catalytic lifetime of 204 min and remarkably improved selectivity for ethylene and propylene reaching up to 86.58 %, which was 34 % and 4.16 % higher than the reference sample. The in situ pretreatment strategy has been developed to synthesize low‐silica SAPO‐34 with excellent catalytic performance in the MTO reaction.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.202200787