Synthesis of multiple-template zeolites with various compositions and investigation of their catalytic properties

Kalantari, Neda; Farzi, Ali; Delibaş, Nagihan Çaylak; Niaei, Aligholi; Salari, Dariush

doi:10.1007/s11164-021-04580-x

Cited by 12 publications

(5 citation statements)

References 78 publications

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“…Considering textural properties of HZ-GA in Table 6, it was observed that a large mesoporous volume was obtained. As discussed in our previous works [40,41], the absence of the amorphous phase in the XRD results of the synthesized hierarchical zeolites indicated the formation of zeolite seeds in the initial moments of the synthesis process. These seeds were formed during the accumulation of aluminosilicate species around the TPABr and the formation of ZSM-5 channels.…”

Section: Fig 10supporting

confidence: 54%

“…The synthesis method was similar to our previous work [40,41]. Ammonium fluoride and aluminum source were dissolved in deionized water to prepare the synthesis gel, and after clarification, the SDA and mesoporogens were added at 15-minute time intervals.…”

Section: Catalyst Synthesismentioning

confidence: 99%

“…9 a, b, and c. This behavior can be because of different combinations of templates on properties such as pore size, surface area and acidity, which affected the selectivity of propylene [40,41]. However, the effect of temperature changes on the target functions was different.…”

Section: Fig 8 Tablementioning

confidence: 99%

“…The first deconvoluted peak in the temperature range of 100-300 ºC was related to weak acidic sites, and the second and third deconvoluted peaks in the range of 300-550 ºC and 550-750 ºC were for medium and strong acidic sites, respectively. Higher weak acidity compared to medium and strong acidity could be a reason for the proper performance of this catalyst for propylene formation in the MTP process [41,52]. The Si/Al ratio was calculated using ICP analysis for HZ-GA catalyst and its results are presented in Table 6.…”

Section: Tablementioning

confidence: 99%

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Simultaneous study of different combinations of ZSM- 5 templates and operating conditions in the MTP process; Designing, Modeling and Optimization by RSM-ANN-GA

Kalantari,

Farzi,

Hamooni

et al. 2023

Preprint

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Process of converting methanol to propylene is influenced by many parameters. The use of smart techniques can be an effective way to investigate variable parameters and finding optimal conditions. In this work, optimal design of ZSM-5 catalysts with different combinations of templates and operating conditions in methanol to propylene process was performed using response surface methodology and hybrid artificial neural network-genetic algorithm method. Objective functions for optimization were methanol conversion and propylene selectivity. Effects of different variables in the dual-responses system, including molar ratios of tetra propyl ammonium bromide (TPABr), Cetyltrimethylammonium bromide (CTAB), and Pluronic F127, as well as weight hourly space velocity of feed and process temperature on the performance of catalysts, were studied both experimentally and theoretically. Modeling results showed that the designed neural network structure for the process had superior accuracy compared to RSM with correlation coefficients of 0.9976, 0.9950 and 0.9946 for training, validation and testing, respectively. By combining optimal templates, optimum operating temperature of 420 °C and WHSV of 1 h-1 were obtained based on the genetic algorithm to achieve maximum selectivity of propylene and the highest possible conversion of methanol. The optimal catalyst had stable performance under the optimal conditions.

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Section: Fig 10supporting

confidence: 54%

Section: Catalyst Synthesismentioning

confidence: 99%

Section: Fig 8 Tablementioning

confidence: 99%

Section: Tablementioning

confidence: 99%

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Simultaneous study of different combinations of ZSM- 5 templates and operating conditions in the MTP process; Designing, Modeling and Optimization by RSM-ANN-GA

Kalantari,

Farzi,

Hamooni

et al. 2023

Preprint

Self Cite

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“…With respect to the presence of such porous systems, diffusion properties within the zeolite crystals can be improved. For instance, mesoporous zeolites have been synthesized using several types of soft templates, such as cationic surfactants, silylated polymers, cetyltrimethylammonium bromide, Pluronic F127 or a combination of these super large templates [121][122][123]. A hierarchical SAPO-34 structure was obtained by means of a quaternary ammonium-type organosilane surfactant and diethylamine [124].…”

Section: Soft-templating Technique For the Synthesis Of Large Pore An...mentioning

confidence: 99%

A Review on the Effects of Organic Structure-Directing Agents on the Hydrothermal Synthesis and Physicochemical Properties of Zeolites

Pour

Sebakhy

2022

Chemistry

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The study on the synthesis of zeolites, including both the development of novel techniques of synthesis and the discovery of new zeolitic frameworks, has a background of several decades. In this context, the application of organic structure-directing agents (SDAs) is one of the key factors having an important role in the formation of porous zeolitic networks as well as the crystallization process of zeolites. There are various elements that are needed to be explored for elucidating the effects of organic SDAs on the final physicochemical properties of zeolites. Although SDAs were firstly used as pore generators in the synthesis of high-silica zeolites, further studies proved their multiple roles during the synthesis of zeolites, such as their influences on the crystallization evolution of zeolite, the size of the crystal and the chemical composition, which is beyond their porogen properties. The aim of this mini review is to present and briefly summarize these features as well as the advances in the synthesis of new SDAs during the last decades.

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Simultaneous study of different combinations of ZSM-5 templates and operating conditions in the MTP process; designing, modeling, and optimization by RSM-ANN-GA

Kalantari,

Farzi,

Hamooni

et al. 2024

J Sol-Gel Sci Technol

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Synthesis of multiple-template zeolites with various compositions and investigation of their catalytic properties

Cited by 12 publications

References 78 publications

Simultaneous study of different combinations of ZSM- 5 templates and operating conditions in the MTP process; Designing, Modeling and Optimization by RSM-ANN-GA

Simultaneous study of different combinations of ZSM- 5 templates and operating conditions in the MTP process; Designing, Modeling and Optimization by RSM-ANN-GA

A Review on the Effects of Organic Structure-Directing Agents on the Hydrothermal Synthesis and Physicochemical Properties of Zeolites

Simultaneous study of different combinations of ZSM-5 templates and operating conditions in the MTP process; designing, modeling, and optimization by RSM-ANN-GA

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