scholarly journals Revisiting the seed-assisted synthesis of zeolites without organic structure-directing agents: insights from the CHA case

RSC Advances ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 5304-5315 ◽  
Author(s):  
Grandprix T. M. Kadja ◽  
Iftitah R. Kadir ◽  
Adroit T. N. Fajar ◽  
Veinardi Suendo ◽  
Rino R. Mukti
Keyword(s):  
Crystallization Behaviour ◽  
Structure Directing Agent ◽  
Organic Structure ◽  
Structure Directing Agents

Herein, the crystallization behaviour of the CHA zeolite synthesized via the seed-assisted method and in the absence of an organic structure-directing agent has been revisited.

Structure-directing study of 1-methylimidazolium-based dication with tetramethylene as spacer length in the synthesis of microporous silicoaluminophosphates

2021 ◽  
Author(s):  
Thayara Kellen Tavares ◽  
Gabrielli Almeida ◽  
Yuri Variani ◽  
Katia Bernardo-Gusmão ◽  
Paloma Vinaches ◽  
...  
Keyword(s):  
Structure Directing Agent ◽  
Spacer Length ◽  
Organic Structure ◽  
Directing Effect

In this work we study the structure-directing effect of 1-methylimidazolium-based dications with four methylene units as spacer length (4BI), as Organic Structure-Directing Agent (OSDA) in the synthesis of silicoaluminophosphate (SAPO)...

scholarly journals AFX Zeolite for Use as a Support of NH3-SCR Catalyst Mining through AICE Joint Research Project of Industries–Academia–Academia

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 163
Author(s):  
Masaru Ogura ◽  
Yumiko Shimada ◽  
Takeshi Ohnishi ◽  
Naoto Nakazawa ◽  
Yoshihiro Kubota ◽  
...  
Keyword(s):  
High Performance ◽  
Ionic Species ◽  
Research Project ◽  
Joint Research ◽  
Structure Directing Agent ◽  
Scr Catalyst ◽  
Organic Structure ◽  
Nh3 Scr ◽  
Joint Research Project ◽  
The One

This paper introduces a joint industries–academia–academia research project started by researchers in several automobile companies and universities working on a single theme. Our first target was to find a zeolite for NH3-SCR, that is, zeolite mining. Zeolite AFX, having the same topology of SSZ-16, was found to be the one of the zeolites. SSZ-16 can be synthesized by using an organic structure-directing agent such as 1,1′-tetramethylenebis(1-azonia-4-azabicyclo[2.2.2]octane; Dab-4, resulting in the formation of Al-rich SSZ-16 with Si/Al below five. We found that AFX crystallized by use of N,N,N′,N′-tetraethylbicyclo[2.2.2]oct-7-ene-2,3:5,6-dipyrrolidinium ion, called TEBOP in this study, had the same analog as SSZ-16 having Si/Al around six and a smaller particle size than SSZ-16. The AFX demonstrated a high performance for NH3-SCR as the zeolitic support to load a large number of divalent Cu ionic species with high hydrothermal stability.

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

scholarly journals Organic Structure-Directing Agent-Free Synthesis of Mordenite-Type Zeolites Driven by Al-Rich Amorphous Aluminosilicates

ACS Omega ◽  
2021 ◽  
Author(s):  
Ting Xiao ◽  
Mizuho Yabushita ◽  
Toshiki Nishitoba ◽  
Ryota Osuga ◽  
Motohiro Yoshida ◽  
...  
Keyword(s):  
Structure Directing Agent ◽  
Organic Structure

Comparative Study on the Different Interaction Pathways between Amorphous Aluminosilicate Species and Organic Structure-Directing Agents Yielding Different Zeolite Phases

2017 ◽  
Vol 121 (43) ◽  
pp. 24324-24334 ◽  
Author(s):  
Tadashi Umeda ◽  
Hiroki Yamada ◽  
Koji Ohara ◽  
Kaname Yoshida ◽  
Yukichi Sasaki ◽  
...  
Keyword(s):  
Comparative Study ◽  
Organic Structure ◽  
Amorphous Aluminosilicate ◽  
Structure Directing Agents

Influence of Organic Structure Directing Agent Isomer Distribution on the Synthesis of SSZ-39

2015 ◽  
Vol 27 (7) ◽  
pp. 2695-2702 ◽  
Author(s):  
Michiel Dusselier ◽  
Joel E. Schmidt ◽  
Roger Moulton ◽  
Barry Haymore ◽  
Mark Hellums ◽  
...  
Keyword(s):  
Structure Directing Agent ◽  
Organic Structure ◽  
Isomer Distribution

scholarly journals Zeolite Synthesis Using Imidazolium Cations as Organic Structure-Directing Agents

2019 ◽  
Vol 10 (1) ◽  
pp. 303
Author(s):  
Paloma Vinaches ◽  
Sibele Pergher
Keyword(s):  
Research Study ◽  
Research Area ◽  
Zeolite Synthesis ◽  
New Materials ◽  
Imidazolium Cation ◽  
Organic Structure ◽  
Imidazolium Cations ◽  
Structure Directing Agents ◽  
Direction Effect

Imidazolium-derivative cations are very interesting molecules used as organic structure-directing agents (OSDAs) for zeolite synthesis, widening the possibilities of new materials and applications in this research area. In this review, the studies performed at LABPEMOL using this kind of compound are presented after a quick overview on imidazolium derivatives. The first zeolite synthesis results that started this research study were obtained with 1-butyl-3-methylimidazolium chloride. Then, the design of new OSDAs based on the imidazolium cation, such as 1,2,3-triethylimidazolium, 2-ethyl-1,3-dimethylimidazolium and 1,2,3-triethyl-4-methylimidazolium, is reported. Afterwards, the structure-direction effect caused by the introduction of heteroatoms with already-published imidazolium derivatives (for example, the Al3+ insertion into zeolite frameworks with two different OSDAs and the silicoaluminophosphate (SAPO) synthesis using 2-ethyl-1,3,4 trimethylimidazolium cations) is discussed. Finally, we also present a quick overview of some achievements of other laboratories.

Seed-Assisted, One-Pot Synthesis of Hollow Zeolite Beta without Using Organic Structure-Directing Agents

2013 ◽  
Vol 8 (7) ◽  
pp. 1419-1427 ◽  
Author(s):  
Kenta Iyoki ◽  
Keiji Itabashi ◽  
Tatsuya Okubo
Keyword(s):  
Zeolite Beta ◽  
One Pot ◽  
Organic Structure ◽  
One Pot Synthesis ◽  
Structure Directing Agents
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