Zeolite Seeds: Third Type of Structure Directing Agents in the Synthesis of Zeolites

2015 ◽  
Vol 36 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Yanyan Ji ◽  
Yeqing Wang ◽  
Bin Xie ◽  
Feng-Shou Xiao
Keyword(s):  
Zeolite Seeds ◽  
Structure Directing Agents

scholarly journals Hierarchical HZSM-5 for Catalytic Cracking of Oleic Acid to Biofuels

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 747
Author(s):  
Mahashanon Arumugam ◽  
Chee Keong Goh ◽  
Zulkarnain Zainal ◽  
Sugeng Triwahyono ◽  
Adam F. Lee ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Solid Acid ◽  
High Surface ◽  
High Surface Area ◽  
Acid Catalyst ◽  
Hierarchical Network ◽  
Waste Oil ◽  
Acid Catalyzed ◽  
Zeolite Seeds ◽  
20 Nm

Solid acid catalyzed cracking of waste oil-derived fatty acids is an attractive route to hydrocarbon fuels. HZSM-5 is an effective acid catalyst for fatty acid cracking; however, its microporous nature is susceptible to rapid deactivation by coking. We report the synthesis and application of hierarchical HZSM-5 (h-HZSM-5) in which silanization of pre-crystallized zeolite seeds is employed to introduce mesoporosity during the aggregation of growing crystallites. The resulting h-HZSM-5 comprises a disordered array of fused 10–20 nm crystallites and mesopores with a mean diameter of 13 nm, which maintain the high surface area and acidity of a conventional HZSM-5. Mesopores increase the yield of diesel range hydrocarbons obtained from oleic acid deoxygenation from ~20% to 65%, attributed to improved acid site accessibility within the hierarchical network.

scholarly journals Alcohol-assisted synthesis of high-silica zeolites in the absence of organic structure-directing agents

2021 ◽  
Vol 42 (4) ◽  
pp. 563-570
Author(s):  
Huimin Luan ◽  
Chi Lei ◽  
Ye Ma ◽  
Qinming Wu ◽  
Longfeng Zhu ◽  
...  
Keyword(s):  
Organic Structure ◽  
High Silica ◽  
High Silica Zeolites ◽  
Structure Directing Agents

Supramolecular Chemistry in the Structure Direction of Microporous Materials from Aromatic Structure-Directing Agents

2008 ◽  
Vol 130 (40) ◽  
pp. 13274-13284 ◽  
Author(s):  
Luis Gómez-Hortigüela ◽  
Fernando López-Arbeloa ◽  
Furio Corà ◽  
Joaquín Pérez-Pariente
Keyword(s):  
Supramolecular Chemistry ◽  
Microporous Materials ◽  
Aromatic Structure ◽  
Structure Directing Agents

Symmetry-derived structure directing agents for two-dimensional crystals of arbitrary colloids

Soft Matter ◽  
2021 ◽  
Author(s):  
Nathan A. Mahynski ◽  
Vincent K. Shen
Keyword(s):  
Two Dimensional ◽  
Self Assembling ◽  
Structure Directing Agents

We derive properties of self-assembling rings which can template the organization of an arbitrary colloid into any periodic symmetry in two Euclidean dimensions.

Highly ordered nanoporous thin films by blending of PSt-b-PMMA block copolymers and PEO additives as structure directing agents

2008 ◽  
Vol 46 (24) ◽  
pp. 8041-8048 ◽  
Author(s):  
Sung Chan Park ◽  
Hyunjung Jung ◽  
Ken-ichi Fukukawa ◽  
Luis M. Campos ◽  
Kyunghee Lee ◽  
...  
Keyword(s):  
Thin Films ◽  
Block Copolymers ◽  
Structure Directing Agents

Control of Nanostructure and Crystallographic Orientation in Electrodeposited ZnO Thin Films via Structure Directing Agents

2014 ◽  
Vol 161 (5) ◽  
pp. D195-D201 ◽  
Author(s):  
Keigo Ichinose ◽  
Tomoaki Mizuno ◽  
Matthew Schuette White ◽  
Tsukasa Yoshida
Keyword(s):  
Thin Films ◽  
Crystallographic Orientation ◽  
Zno Thin Films ◽  
Structure Directing Agents

scholarly journals Study of the performance of imidazolium-derived cations as structure directing agents in the synthesis of zeolites in fluoride media

2016 ◽  
Vol 40 (9) ◽  
pp. 7968-7977 ◽  
Author(s):  
Y. M. Variani ◽  
A. Rojas ◽  
L. Gómez-Hortigüela ◽  
S. B. C. Pergher
Keyword(s):  
Imidazolium Cations ◽  
Pure Silica ◽  
Imidazolium Ring ◽  
Structure Directing Agents

Three imidazolium cations based on the imidazolium ring, 1,2,3-triethylimidazolium (123TEI), 1,2,3-triethyl-4-methylimidazolium (123TE4MI), and 2-ethyl-1,3-dimethyl (2E13DMI), were employed as structure directing agents (SDA) in the synthesis of pure silica zeolites.

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