The effects of templates and seeds on the properties of nanosheet SAPO-34 molecular sieves and their catalytic performance in the MTO reaction
Tao Jiang A , Yingzhi Bai A , Lu Li A , Weiwei Tai B , Yujia Wang A , Haiyan Wang A and Na Sun
A *
+ Author Affiliations
- Author Affiliations
A School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, 113001, Liaoning, China.
B China Coal Technology & Engineering Group Shenyang Research Institute, Shenyang, 110000, Liaoning, China.
Australian Journal of Chemistry 76(2) 81-87 https://doi.org/10.1071/CH22238
Submitted: 21 November 2022 Accepted: 1 February 2023 Published: 28 February 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing.
Abstract
Nanoscale SAPO-34 molecular sieves were synthesized by adding different types of seed into hydrothermal synthesis systems with tetraethylammonium hydroxide (TEAOH) and triethylamine (TEA) & tetraethylammonium bromide (TEABr) as templates. The effects of different types of template and seed on the crystal structure, morphology, grain size and acidity of the molecular sieves were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 isothermal adsorption–desorption and ammonia temperature-programmed desorption (NH3-TPD). The methanol-to-olefins (MTO) reaction performance of the synthesized samples was investigated in a fixed-bed reactor. The results showed that crystalline supernatant and seed soaking solution could be used as liquid seeds to assist in the synthesis of SAPO-34 molecular sieves with a lamellar structure. The yield of SAPO-34 synthesized by seed increased from 38.64 to 59.68%, and the methanol conversion rate was significantly improved as compared with that of SAPO-34 synthesized without seed. The nano-thickness of SAPO-34 synthesized with TEA&TEABr instead of TEAOH as template decreased from 100–150 to 40–50 nm, and the lifetime increased from 360 to 400 min with the original yield kept constant.
Keywords: composite template, crystallization, liquid seed, methanol-to-olefins, mother liquor, nano-sheet, SAPO-34 molecular sieves, TEA, TEABr.
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