Shape controlled zeolite EU-1 (EUO) catalysts: Dry gel conversion type synthesis, characterization and formation mechanisms

Goergen, Simone; Guillon, Emmanuelle; Patarin, Joël; Rouleau, Loı̈c

doi:10.1016/j.micromeso.2009.06.019

Cited by 20 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The dry-gel conversion (DGC), involving treating amorphous gel powder to form a crystalline zeolite upon contact with the vapors of water or volatile amines, is an environmentally benign route for synthesis of porous materials and has been applied in the preparation of zeolites and zeolite membranes. − Compared with the conventional hydrothermal synthesis, DGC has potential advantages, including minimum waste disposal, reduced consumption of templates, and the possibility of continuous production. ,− ZIF-8, MIL-100(Fe), and MIL-101(Cr) have been successfully synthesized by this method. However, the synthesis of the UiO family by using the DGC method has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Dry-Gel Conversion Synthesis of Zr-Based Metal–Organic Frameworks

Zhou

Jia

et al. 2017

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

UiO-66 was successfully synthesized in the absence of any amide solvents and hydrochloric acid by using the dry-gel conversion (DGC) method for the first time. The prepared UiO-66 samples (denoted as UiO-66-DGC) were characterized by XRD, SEM, TGA, CO2 adsorption, NH3-TPD, and N2 adsorption. The results showed that the UiO-66-DGC-E sample synthesized by using ethanol as solvent has similar crystallinity and morphology to the UiO-66 sample prepared by the conventional solvothermal method (denoted as UiO-66-S). However, it has more linker deficiencies, indicating the presence of more defects exposed in Zr clusters. As a result, the prepared UiO-66-DGC-E sample exhibited high catalytic activity and reusability in esterification. This preparation method provides a new alternative method for the efficient and eco-friendly synthesis of metal–organic frameworks (MOFs) and modification of their properties.

show abstract

Section: Introductionmentioning

confidence: 99%

Dry-Gel Conversion Synthesis of Zr-Based Metal–Organic Frameworks

Zhou

Jia

et al. 2017

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Since the initial DGC dry gel contains 20–40 wt % water, it is now widely accepted that the crystallization mechanism in the DGC process is fundamentally similar to that of hydrothermal synthesis, which has a more accessible liquid phase . DGC has been demonstrated to be an effective approach to study the formation of several types of molecular sieves. − …”

Section: Introductionmentioning

confidence: 99%

New Insights into Formation of Molecular Sieve SAPO-34 for MTO Reactions

Zhang

Huang

2016

J. Phys. Chem. C

View full text Add to dashboard Cite

Small-pore molecular sieve SAPO-34 is well-known as the most promising and effective catalyst for the conversion of methanol to olefins (MTO). In this paper, we have investigated the formation of SAPO-34 under different dry gel conversion (DGC) conditions using two types of synthesis gels with one containing hydrofluoric acid (HF) and the other not. Particular attention was paid to the Si incorporation and distribution in final SAPO-34 products. The results indicate that under DGC (with HF) conditions SAPO-34 is formed from the transformation of a highly crystalline, layered prephase that is held by covalent bonds. The final SAPO-34 product is a mixture of triclinic and trigonal phases containing six framework Si species. The Si distribution in triclinic and trigonal SAPO-34 is drastically different. The majority of Si species are located in the aluminosilicate domains in trigonal phase. Conversely, under DGC (without HF) conditions, the crystallization of SAPO-34 involves three transformational stages. Initially, a layered, crystalline intermediate forms and then transforms to a semicrystalline phase. The structures of both intermediates are held by weak noncovalent bonding interactions. The final SAPO-34 product is in pure trigonal form and contains two major Si species. Despite the difference in Si distribution, the SAPO-34 products prepared by using different gels have similar bulk Si contents. MTO reaction tests show that before 50 min of time-on-stream the DGC (with HF) product gives lower ethylene and propylene selectivity but higher propane selectivity than the DGC (without HF) product. After 50 min on stream, similar light olefin and propane selectivities are observed over the two SAPO-34 samples.

show abstract

“…EU-1 zeolite possesses a one-dimensional channel system of 10-membered-ring channels (0.58 × 0.41 nm) running along the [100] direction, which is connected with 12-membered-ring side pockets (0.68 × 0.58 × 0.80 nm) in the [001] direction. Due to this unique structure, aluminosilicate EU-1 zeolite shows superior catalytic performances in a series of catalytic reactions especially in m -xylene isomerization reaction [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Therefore, the research on synthesis methods of aluminosilicate EU-1 zeolite is of significance.…”

Section: Introductionmentioning

confidence: 99%

“…In dry-gel conversion process, a prepared damp or dried sodium aluminosilicate gel suspended above a liquid in a sealed autoclave was subjected to a mixed vapor of water at elevated temperature and pressure. It is worth noting that the large amounts of solvents, such as water, are necessary in the preparation of damp or dried sodium aluminosilicate gel [ 25 , 30 ]. Currently, the solvent-free synthesis method of pure silica EUO zeolite was successfully achieved by Wu et al in the presence of fluoride species [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Route for Synthesizing Aluminosilicate EU-1 Zeolite

Zhu

Wang

et al. 2021

Molecules

View full text Add to dashboard Cite

Developing sustainable routes for the synthesis of zeolites is still a vital and challenging task in zeolite scientific community. One of the typical examples is sustainable synthesis of aluminosilicate EU-1 zeolite, which is not very efficient and environmental-unfriendly under hydrothermal condition due to the use of a large amount of water as solvent. Herein, we report a sustainable synthesis route for aluminosilicate EU-1 zeolite without the use of solvent for the first time. The physicochemical properties of the obtained EU-1 zeolite are characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry-differential thermal analysis (TG-DTA), N2 sorption, inductively coupled plasma (ICP) analysis, and solid nuclear magnetic resonance (NMR), which show the product has high crystallinity, uniform morphology, large BET surface area, and four-coordinated aluminum species. Moreover, the impact of synthesis conditions is investigated in detail. The sustainable synthesis of aluminosilicate EU-1 zeolite under solvent-free

show abstract

Shape controlled zeolite EU-1 (EUO) catalysts: Dry gel conversion type synthesis, characterization and formation mechanisms

Cited by 20 publications

References 19 publications

Dry-Gel Conversion Synthesis of Zr-Based Metal–Organic Frameworks

Dry-Gel Conversion Synthesis of Zr-Based Metal–Organic Frameworks

New Insights into Formation of Molecular Sieve SAPO-34 for MTO Reactions

Sustainable Route for Synthesizing Aluminosilicate EU-1 Zeolite

Contact Info

Product

Resources

About