The role of diquaternary cations as directing agents in zeolite synthesis

Moini, Ahmad; Schmitt, Kirk D.; Valyocsik, E.W.; Polomski, R.F.

doi:10.1016/0144-2449(94)90182-1

Cited by 93 publications

(64 citation statements)

References 5 publications

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“…The strong influence of inorganic synthesis parameters such as Al content and type and concentration of metal alkali cations in the gel on the phase selectivity of the crystallization has also been observed for the synthesis of zeolite syntheses using the (CH 3 ) 3 N + (CH 2 ) 5 N + (CH 3 ) 3 ion (N,N 0 -bis-trimethylpentanediyldiammonium, Me 6 -diquat-5), a slightly shorter OSDA than Et 6 -diquat-5, because we were able to crystallize at least four different zeolite structures including EU-1 (EUO), ZSM-48, ZSM-12 (MTW), and MCM-22 (MWW) in the presence of this diquaternary cation [20][21][22]. It is interesting to note here that neither of the zeolites prepared with Me 6 -diquat-5 has the same framework topology as that of any of the materials that can be synthesized using Et 6 -diquat-5.…”

Section: Molecular Conformation Of Hydrogen-bonded Ethylene Glycol Inmentioning

confidence: 98%

Use of Flexible Diquaternary Structure-directing Agents in Zeolite Synthesis: Discovery of Zeolites TNU-9 and TNU-10 and Their Catalytic Properties

Hong

2008

Catal Surv Asia

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This review summarizes our recent work on zeolite syntheses in the presence of linear diquaternary alkylammonium ions, with the object of controlling the conformations of these flexible, hydrophilic organic structure-directing agents by varying the type and concentration of inorganic components in synthesis mixtures. After describing how we have been concerned about the search for novel zeolite structures through this synthetic strategy, we discuss the cooperative structure-directing effects of 1,4-bis(N-methylpyrrolidinium)butane and specific levels of Na + ions and lattice negative charges introduced by Al substitution on the crystallization of new medium-pore zeolites TNU-9 and TNU-10. The physicochemical and catalytic properties of these two materials are also outlined.

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Section: Molecular Conformation Of Hydrogen-bonded Ethylene Glycol Inmentioning

confidence: 98%

Use of Flexible Diquaternary Structure-directing Agents in Zeolite Synthesis: Discovery of Zeolites TNU-9 and TNU-10 and Their Catalytic Properties

Hong

2008

Catal Surv Asia

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“…A variety of organic amines and quaternary ammonium molecules were used as templates for the synthesis of ZSM-23 zeolite [22][23][24][25][26][27][28]. Nevertheless, it is repeatedly stated in some literatures that failure often occurred in the synthesis of pure ZSM-23, sometimes ZSM-5 was formed instead [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

A novel approach to synthesize ZSM-23 zeolite involving N,N-dimethylformamide

Wang

Tian

Wang

et al. 2010

Microporous and Mesoporous Materials

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“…These morphologies were similar to the conventional zeolite crystals synthesized with diamines or diquaternary ammonium cations. 12) …”

Section: )22)mentioning

confidence: 99%

Synthesis of pure-silica ZSM-48 zeolite under mild hydrothermal condition with conventional amphiphilic cation by tuning the reactant gel composition

Moteki

Keoh

Ohmura

et al. 2013

J. Ceram. Soc. Japan

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We synthesized pure-silica ZSM-48 zeolite with cheap and conventional amphiphilic organic cation, dodecyltrimethyl ammonium cation, as structure-directing agent. Although severe hydrothermal conditions are usually required to utilize organics possessing anisotropic charge distribution, by controlling the water content of the reactant gel, the crystallization was completed within 5 days at 160°C. This approach enabled the ZSM-48 zeolite synthesis with lower synthesis temperature, shorter synthesis period, and higher productivity. Smaller size of the obtained crystals reflected the enhanced nucleation from the concentrated reactant gel. These results suggested that the concentrated system has an advantage in the synthesizing zeolite with an amphiphilic organic cation as structure-directing agent.

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The role of diquaternary cations as directing agents in zeolite synthesis

Cited by 93 publications

References 5 publications

Use of Flexible Diquaternary Structure-directing Agents in Zeolite Synthesis: Discovery of Zeolites TNU-9 and TNU-10 and Their Catalytic Properties

Use of Flexible Diquaternary Structure-directing Agents in Zeolite Synthesis: Discovery of Zeolites TNU-9 and TNU-10 and Their Catalytic Properties

A novel approach to synthesize ZSM-23 zeolite involving N,N-dimethylformamide

Synthesis of pure-silica ZSM-48 zeolite under mild hydrothermal condition with conventional amphiphilic cation by tuning the reactant gel composition

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