Organotemplate-free and seed-directed synthesis of ZSM-34 zeolite with good performance in methanol-to-olefins

Yang, Chengguang; Ren, Limin; Zhang, Haiyan; Zhu, Longfeng; Wang, Qianqian; Meng, Xiangju; Xiao, Feng

doi:10.1039/c2jm31479g

Cited by 43 publications

(23 citation statements)

References 72 publications

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“…Catalytic tests of the MTO reaction show that HZSM-34-S has a very high selectivity for propylene (55.2 %), which is even higher than that (47.0 %) of SAPO-34 under the same conditions [ 104 ]. Moreover, the hydrothermal treatment of HZSM-34-S signifi cantly improves the catalyst life for MTO due to decreasing acidic concentration and increasing anti-deactivation.…”

Section: Zsm-34 Zeolitementioning

confidence: 96%

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Sustainable Routes for Zeolite Synthesis

Meng¹,

Wang²,

Xiao³

2016

Green Chemistry and Sustainable Technology

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The modern synthesis of zeolites mainly involves the use of organic templates, the addition of solvent, the preparation of starting gels, and the heating of the gels. Each step could be made greener in the future. This chapter presents a brief overview on the recently reported green routes for synthesizing zeolites, mainly focusing on the reduction or elimination of organic templates as well as the complete elimination of solvent. To overcome the disadvantages of using organic templates, nontoxic templates and template recycling steps have been employed in the zeolite syntheses. In addition, organotemplate-free synthesis has become a popular and universal methodology for synthesizing zeolites. Particularly, seed-directed synthesis in the absence of organic templates is a general route for synthesizing a series of zeolites. From an economic and environmental standpoint, solvent-free synthesis is a great move toward "green" synthesis of zeolite due to the following: high yields, high effi ciency, low waste, low pollution, low pressure, hierarchical porosity, and simple and convenient procedure. Combining the advantages of solvent-free and organotemplate-free synthesis would particularly open the pathway to a highly sustainable zeolite synthesis protocol in industry.

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Section: Zsm-34 Zeolitementioning

confidence: 96%

“…0.5-3 μm) [ 104 ]. SEM images of the ZSM-34 samples prepared via different routes including ZSM-34-C (conventional ZSM-34), HZSM-34-L (assisted by L seed solution), and HZSM-34-S (SDS) exhibit a pure phase of crystals, but quite different crystal sizes and morphologies.…”

Section: Zsm-34 Zeolitementioning

confidence: 99%

Sustainable Routes for Zeolite Synthesis

Meng¹,

Wang²,

Xiao³

2016

Green Chemistry and Sustainable Technology

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“…The yields are low (∼20–30 %) in part due to the inevitable dissolution of silica species, but a recent report found that the silica‐based zeolite yield could be significantly increased to ∼80 % by using synthesis precursors with higher Al contents since the aluminosilicate species tend to be incorporated into the solids more favorably than the silicate species during crystallization . Over the past decade, the seed‐directed OSDA‐free strategy has been successfully applied to the synthesis of many types of zeolites, including PAU, MFI, MEL, FER, MOR,, SZR, MSE, MAZ, CHA, RTH, VET, MTW, LEV, EMT, MTT, TON, MWW, and ZSM‐34 . The seed‐directed OSDA‐free synthetic strategy represents a key recent progress in advancing sustainable chemistry for the production of zeolites.…”

Section: Organotemplate‐free Synthesis Of Zeolitesmentioning

confidence: 99%

Understanding Commonalities and Interplay Between Organotemplate‐Free Zeolite Synthesis, Hierarchical Structure Creation, and Interzeolite Transformation

2018

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are crystalline microporous materials that have been widely used in many applications related to industrial catalysis, ion-exchange, and adsorption. In recent years, there has been a growing emphasis on the development of green chemistry toward more sustainable zeolite synthesis routes. Considerable efforts have been devoted to identifying alternative approaches in order to reduce the negative impacts of organic templates. This review will focus on the significant progress achieved during the past decade on the development of novel organotemplate-free strategies through three distinctive topics, i. e. zeolite synthesis, hierarchical zeolite synthesis, and interzeolite transformation. The progress of each topic will be documented, followed by a summary of the intriguing commonalities and interplay among these approaches. The insights into the mechanism and interplay leading to different zeolite materials will enable us to understand the requirements for designing novel zeolite catalysts and catalyst supports in an organotemplate-free environment that are likely to further enhance the industrial impact of these materials in the future. We conclude this article with a perspective and outlook focusing on current trends and future directions in this area.[a] Dr.

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“…In our group, we have extended this organotemplate‐free route to synthesize the Levyne,73 ferrierite,74 ZSM‐34,75 ZSM‐22,76 and ZSM‐2377 zeolites. Very interestingly, the zeolite products from the organotemplate‐free routes normally have more Al sites than those synthesized in the presence of organic templates, which can be reasonably related to the unique feature of the synthesis, where the relatively smaller molecular diameters of the alkali‐metal cations than those of organic ammonium cations lead to the ability to accommodate more alkali‐metal cations in the zeolite micropores.…”

Section: Organotemplate‐free Synthesis Of Zeolitesmentioning

confidence: 99%

Understanding Mechanism and Designing Strategies for Sustainable Synthesis of Zeolites: A Personal Story

Wang

Xiao

2016

The Chemical Record

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Zeolites with intricate micropores have been widely studied for a long time as an important class of porous materials in different areas of industrial processes such as gas adsorption and separation, ion exchange, and shape-selective catalysis. However, their industrial syntheses are not sustainable, and normally require the presence of expensive organic templates and a large amount of solvents such as water. The presence of organic templates not only increases zeolite cost but also produces harmful gases during the removal of these templates by calcination, while the use of solvents significantly increases the amount of polluted water. This Personal Account briefly summarizes recent sustainable routes for the synthesis of zeolites in our group according to our understanding of the synthetic mechanism, and mainly focuses on the organotemplate-free synthesis of zeolites in the presence of zeolite seeds, the design of environmentally friendly templates, and solvent-free synthesis of zeolites.

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Organotemplate-free and seed-directed synthesis of ZSM-34 zeolite with good performance in methanol-to-olefins

Cited by 43 publications

References 72 publications

Sustainable Routes for Zeolite Synthesis

Sustainable Routes for Zeolite Synthesis

Understanding Commonalities and Interplay Between Organotemplate‐Free Zeolite Synthesis, Hierarchical Structure Creation, and Interzeolite Transformation

Understanding Mechanism and Designing Strategies for Sustainable Synthesis of Zeolites: A Personal Story

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