Cesium-free synthesis of aluminosilicate RHO zeolite in the presence of cationic polymer

Liu, Shuzhen; Zhang, Pengling; Meng, Xiangju; Liang, Desheng; Xiao, Ni; Xiao, Feng‐Shou

doi:10.1016/j.micromeso.2010.03.012

Cited by 21 publications

(23 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…13 The schematic phase diagram in Fig. At this point there appears to be a superposition of both zeolite RHO and Na-X in the XRD pattern.…”

Section: Pxrd Datamentioning

confidence: 92%

“…It is commonly seen that the presence of larger structure breaking cations retards the crystallisation process. [11][12][13][14][15][16][17] Zeolite RHO is a synthetic zeolite. However, work by Burkett et al, showed that alongside sodium, addition of larger secondary cations favoured the formation of different zeolite frameworks such as CHA and OFF, rather than impeding crystallisation as a process altogether.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14][15][16][17] The exact mechanism by which the cation promotes the formation of the framework has not been directly explained, however it is believed that it is the cation's size which directs the formation of a more open structure. [11][12][13][14][15][16][17] The exact mechanism by which the cation promotes the formation of the framework has not been directly explained, however it is believed that it is the cation's size which directs the formation of a more open structure.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14][15][16][17] The exact mechanism by which the cation promotes the formation of the framework has not been directly explained, however it is believed that it is the cation's size which directs the formation of a more open structure. 13 This is understood with Ostwald's rule of successive transformations, whereby hydrothermal conditions and formulations initially produce kinetically stable products such as zeolite RHO before transforming to more thermodynamically stable ones such as analcime. It is known that the caesium cation plays a part in templating the double 8 ring (D8R) channels between α-cages in the framework.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of alkali metal cations on the formation of zeolites under hydrothermal conditions with no organic structure directing agents

Nearchou

Sartbaeva

2015

CrystEngComm

View full text Add to dashboard Cite

Alkali metal cations play an important role in directing formation of zeolite frameworks in the absence of organic structure directing agents. The interplay between Na and Cs cations in directing formation of zeolite RHO is the main focus of this study. Depending on the ratio of Na and Cs in the precursor gel, with no organic structure directing agents, several different zeolites form during synthesis. This indicates that pure zeolite RHO can only be obtained at a very specific Cs to Na ratio. More generally, this may shed light on the bigger question of how zeolite pores form in the absence of organic structure directing agents. Fig. 1 Zeolite RHO, Si and Al tetrahedral units are represented by blue and light blue tetrahedra, Cs atoms are in pink and Na atoms are yellow. LTA and D8R secondary building units are labelled. In this representation, there are 8 LTA cages in each corner and one in the middle, and 8 D8R units connecting the corner LTA units.

show abstract

“…13 The schematic phase diagram in Fig. At this point there appears to be a superposition of both zeolite RHO and Na-X in the XRD pattern.…”

Section: Pxrd Datamentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14][15][16][17] The exact mechanism by which the cation promotes the formation of the framework has not been directly explained, however it is believed that it is the cation's size which directs the formation of a more open structure. 13 This is understood with Ostwald's rule of successive transformations, whereby hydrothermal conditions and formulations initially produce kinetically stable products such as zeolite RHO before transforming to more thermodynamically stable ones such as analcime. It is known that the caesium cation plays a part in templating the double 8 ring (D8R) channels between α-cages in the framework.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of alkali metal cations on the formation of zeolites under hydrothermal conditions with no organic structure directing agents

Nearchou

Sartbaeva

2015

CrystEngComm

View full text Add to dashboard Cite

show abstract

“…Recently,ith as been reported that many zeolites such as RHO,Beta, and GME could be successfully synthesized using cationic polymers/oligomers as novel organic templates. [35][36][37] In these cases,itisworth noting that the zeolite products have more Al species in the framework than those synthesized from conventional organic templates.O ne possibility is that the cationic polymers/oligomers have as tronger complexation ability with aluminum species than conventional templates.T herefore,i ti ss uggested that the use of novel cationic oligomer as an efficient organic template might be favorable for direct synthesis of the aluminosilicate ITH zeolite.…”

Section: Introductionmentioning

confidence: 99%

A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

et al. 2020

Self Cite

View full text Add to dashboard Cite

There are a large number of zeolites, such as ITH, that cannot be prepared in the aluminosilicate form. Now, the successful synthesis of aluminosilicate ITH zeolite using a simple cationic oligomer as an organic template is presented. Key to the success is that the cationic oligomer has a strong complexation ability with aluminum species combined with a structural directing ability for the ITH structure similar to that of the conventional organic template. The aluminosilicate ITH zeolite has very high crystallinity, nanosheet‐like crystal morphology, large surface area, fully four‐coordinated Al species, and abundant acidic sites. Methanol‐to‐propylene (MTP) tests reveal that the Al‐ITH zeolite shows much higher selectivity for propylene and longer lifetime than commercial ZSM‐5. FCC tests show that Al‐ITH zeolite is a good candidate as a shape‐selective FCC additive for enhancing propylene and butylene selectivity.

show abstract

A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

Cesium-free synthesis of aluminosilicate RHO zeolite in the presence of cationic polymer

Cited by 21 publications

References 28 publications

Influence of alkali metal cations on the formation of zeolites under hydrothermal conditions with no organic structure directing agents

Influence of alkali metal cations on the formation of zeolites under hydrothermal conditions with no organic structure directing agents

A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

Contact Info

Product

Resources

About