TY - JOUR

T1 - Template-Free Synthesis of ZSM-5: Effect of Precursor Composition on the Crystallinity and Crystal Morphology

AU - Bragina, A. A.

AU - Babina, K. A.

AU - Kasyanov, A. V.

AU - Parkhomchuk, E. V.

N1 - This work was supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental assignment for Boreskov Institute of Catalysis (project FWUR-2024-0036).

PY - 2024/10/30

Y1 - 2024/10/30

N2 - A series of ZSM-5 samples were synthesized by template-free hydrothermal synthesis without adding seed crystals. When synthesis parameters such as temperature, duration, and molar ratio of components being equal, various silicas (specifically, Silica-Fumed from Sigma-Aldrich; Rosil-175 from the Bashkir Soda Company (BSC), Russia; Silica from the Salavat Catalyst Plant (SCP), Russia; and Aerosil-300 from Evonik, Germany) and of aluminum (Al(NO3)3∙9H2O and NaAlO2) were varied. In the presence of sodium aluminate, highly crystalline ZSM-5 samples were synthesized, whereas the use of aluminum nitrate led to an amorphous product due to accelerating aluminosilicate condensation. The ZSM-5 crystals prepared from various SiO2 sources have different morphology, including the crystal size (ranging from 5.9 to 12.2 µm) and the aspect ratio (from 1.9 to 2.6). The ZSM-5 samples synthesized from available Russian-manufactured SiO2 sources (Rosil-175 (BSC) and Silica (SCP)) in the presence of sodium aluminate consisted of crystals with average sizes of 5.9 and 6.9 μm, respectively, and a narrow particle size distribution (cv < 20%).

AB - A series of ZSM-5 samples were synthesized by template-free hydrothermal synthesis without adding seed crystals. When synthesis parameters such as temperature, duration, and molar ratio of components being equal, various silicas (specifically, Silica-Fumed from Sigma-Aldrich; Rosil-175 from the Bashkir Soda Company (BSC), Russia; Silica from the Salavat Catalyst Plant (SCP), Russia; and Aerosil-300 from Evonik, Germany) and of aluminum (Al(NO3)3∙9H2O and NaAlO2) were varied. In the presence of sodium aluminate, highly crystalline ZSM-5 samples were synthesized, whereas the use of aluminum nitrate led to an amorphous product due to accelerating aluminosilicate condensation. The ZSM-5 crystals prepared from various SiO2 sources have different morphology, including the crystal size (ranging from 5.9 to 12.2 µm) and the aspect ratio (from 1.9 to 2.6). The ZSM-5 samples synthesized from available Russian-manufactured SiO2 sources (Rosil-175 (BSC) and Silica (SCP)) in the presence of sodium aluminate consisted of crystals with average sizes of 5.9 and 6.9 μm, respectively, and a narrow particle size distribution (cv < 20%).

KW - ZSM-5

KW - crystal size

KW - neural network

KW - template-free synthesis

KW - zeolites

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85207961215&origin=inward&txGid=f3becc95d2b4fb47448c7cd05fa0de04

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001346018200002

UR - https://www.mendeley.com/catalogue/724d3fa9-48c8-3bb6-a089-9799bbab0fe2/

U2 - 10.1134/S0965544124060033

DO - 10.1134/S0965544124060033

M3 - Article

JO - Petroleum Chemistry

JF - Petroleum Chemistry

SN - 0965-5441

ER -