DTA-GC-MS coupling for the characterization of the volatile products resulting from the decomposition of organic templates occluded in zeolites

Soulard, Michel; Bilger, S.; Kessler, H.; Guth, J.L.

doi:10.1016/0040-6031(92)80325-q

Cited by 18 publications

(17 citation statements)

References 3 publications

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“…5. Hence, it is now well understood that this new template is beneficial over TPAOH template for the preparation of ZSM-5, as TBA decomposes into CO 2 and water in contrast to TPAOH (Decomposition products = NO x and NH 3 ) during the process of calcinations [11,14,19,20]. Moreover, TBA is cost economic than TPAOH making its use more attractive.…”

Section: Resultsmentioning

confidence: 98%

Investigation of tertiary butyl alcohol as template for the synthesis of ZSM-5 zeolite

Aziz

Kim

2015

J Porous Mater

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The synthesis of ZSM-5 zeolite in the presence of tertiary butyl alcohol (TBA) in aqueous medium was investigated. It was found that well crystallized zeolite of the ZSM-5 type was formed from the sol of silica and sodium aluminate in the presence of an aqueous solution of tertiary butyl alcohol at the temperature of 180°C in the course of 2 days hydrothermal reaction followed by 1 day aging time, with molar ratios of 1.5 TBA: 50.3 SiO 2 : 1.0 Al 2 O 3 : 6.2 Na 2 O and 1248 H 2 O. The proposed procedure yields pure ZSM-5 zeolites with high surface area and crystallinity confirmed by X-ray diffraction pattern, FTIR spectrum and SEM observations. The acidity strength was measured by NH 3 -TPD analysis and application to the abatement of phenol in the water was also studied. The results proved TBA as an excellent and novel structure directing agent for the preparation of ZSM-5 zeolites.

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Section: Resultsmentioning

confidence: 98%

Investigation of tertiary butyl alcohol as template for the synthesis of ZSM-5 zeolite

Aziz

Kim

2015

J Porous Mater

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“…The formation of PAH molecules are detrimental to the catalytic process and their formation is highly undesirable. Previous work has shown that the fluorescence of these molecules lies within the 400-600 nm range [9], a region which is largely accessible with TPF measurements. As can be seen in Figure 4, the structural location of the TPF is constant across the single bodies within the field of view and follows similar temporal evolution.…”

Section: Resultsmentioning

confidence: 99%

“…SDAs are typically removed by calcination in air or other oxygencontaining gas. During the decomposition of the template from sub-micron sized crystals, various decomposition products have been identified by mass spectrometric analysis [9].…”

Section: Zeolite Catalysismentioning

confidence: 99%

In-situ imaging of reacting single-particle zeolites by non-linear optical microscopy

et al. 2015

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Zeolite catalysis has been exploited by the petrochemical industry since the 1940's for catalytic cracking reactions of long chain hydrocarbons. The selectivity of zeolites strongly depends on a pore size, which is controlled by the chosen structure-directing agent (SDA) and by the SDA decomposition/removal process. Although zeolites are composed of micron-sized crystals, studies of zeolite materials typically focus on bulk (i.e., ensemble) measurements to elucidate structure-function information or to optimize catalysts and/or process parameters. To examine these phenomena on the microscale, non-linear optical microscopy is used to provide real-time imaging of chemical reactions in zeolites at temperatures exceeding 400°C. The template decomposition mechanism is studied, as elucidation of the mechanism is critical to understanding the relationship between the decomposition chemistry and the nanoscale features of the zeolite (topology, Si/Al ratio, added dopants). Forward stimulated Raman scattering (SRS), forward coherent anti-Stokes Raman scattering (CARS) and epi two-photon fluorescence (TPF) modalities are acquired simultaneously providing video-rate structural and chemical information. A high-temperature cell with gas inlet system is used for the study of reactions under various temperatures and gas environments. Examining the decomposition process with single-particle resolution enables access to ensemble-level and spatially-resolved behavior. Parallel experiments on bulk zeolite powders are conducted to enable comparison of ensemble and single-particle behavior during template decomposition. Our multi-technique approach has high potential for gaining insight into the link between nanoscale structure and catalytic activity and selectivity of zeolitic materials.

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“…The organic templates occluded inside the channels of the micropores and mesopores were removed, and the accessibility of framework of ZSM-5 was effectively enhanced by calcination [43]. Meanwhile, the decomposition of organic templates generated steam, which usually contained water, NH 3 , CH 4 , C 2 H 4 , C 3 H 6 , n-C 3 H 7 NH 2 , and iso-C 3 H 7 NH 2 [20,25,44,45]. The sudden release of a large amount of hot steam may cause slight structural damage to the zeolites [25].…”

Section: Bet Analysismentioning

confidence: 99%

Preparation and characterization of ZSM-5/PDMS hybrid pervaporation membranes: Laboratory results and pilot-scale performance

Liu

Chen

Zhan

et al. 2015

Separation and Purification Technology

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DTA-GC-MS coupling for the characterization of the volatile products resulting from the decomposition of organic templates occluded in zeolites

Cited by 18 publications

References 3 publications

Investigation of tertiary butyl alcohol as template for the synthesis of ZSM-5 zeolite

Investigation of tertiary butyl alcohol as template for the synthesis of ZSM-5 zeolite

In-situ imaging of reacting single-particle zeolites by non-linear optical microscopy

Preparation and characterization of ZSM-5/PDMS hybrid pervaporation membranes: Laboratory results and pilot-scale performance

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