A top-down approach to hierarchical SAPO-34 zeolites with improved selectivity of olefin

Chen, Xiaoxin; Xi, Dongyang; Sun, Qiming; Wang, Ning; Dai, Zhen; Fan, Dong; Valtchev, Valentin; Yu, Jihong

doi:10.1016/j.micromeso.2016.07.045

Cited by 87 publications

(47 citation statements)

References 52 publications

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“…The intrinsic properties of materials can be tailored by surface modification; for example, the acidity of BEA zeolite can be controlled using alkali ion‐exchange treatment, and after modification it showed improved catalytic activity in the production of isobutylene from acetone . Moreover, hierarchical SAPO‐5, SAPO‐34, ZSM‐5, ZSM‐48, MCM‐22, Zn‐SAPO‐34, and H‐β zeolite type of materials were prepared using different alkali treatment through post‐synthesis route and their catalytic performance was found to be better than that of as made zeolites . Verboekend et al reported synthesis of hierarchical silicoaluminophosphate by using different acid and base treatments and their catalytic application in model alkylation reaction of benzyl alcohol with toluene .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hierarchical SAPO‐5 & SAPO‐34 Materials by Post‐Synthetic Alkali Treatment and Their Enhanced Catalytic Activity in Transesterification

Jadav

Bandyopadhyay

2020

Eur J Inorg Chem

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SAPO‐5 and SAPO‐34 materials were modified using post‐synthetic alkali treatment, which results in the formation of hierarchical SAPO‐5 and SAPO‐34 materials. To test the generation of mesoporosity, the modified materials were thoroughly characterized using XRD, FE‐SEM, TGA, ICP‐OES, and N2 adsorption/desorption techniques. Alkali treated SAPO‐5 and SAPO‐34 materials were utilized for the model reaction triacetin transesterification, under optimized conditions by varying the catalyst amount and reaction time: 90 % triacetin conversion with 66 % methyl acetate yield was achieved using modified SAPO‐5 catalyst, whereas 68 % triacetin conversion with 37 % methyl acetate yield was achieved using modified SAPO‐34 catalyst. The alkali treated SAPO‐5 catalyst was stable up to the 4th cycle.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Hierarchical SAPO‐5 & SAPO‐34 Materials by Post‐Synthetic Alkali Treatment and Their Enhanced Catalytic Activity in Transesterification

Jadav

Bandyopadhyay

2020

Eur J Inorg Chem

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“…In recent years, numerous studies have been done on the catalysts used in the MTO process. Results of such investigations have shown that silicoaluminophosphate (SAPO‐34) is suitable catalyst for the MTO process owing to their higher selectivity than light olefins .…”

Section: Introductionmentioning

confidence: 99%

“…The second solution for preventing the fast deactivation of the SAPO‐34 nanocatalyst is making catalysts with a hierarchical structure. In this method, meso‐ and macropores are added into the zeolite structure, which includes micropores . In this study, a carbon nanotube (CNT) is used as the mesopore template together with diethylamine (DEA) as the micropore template for the synthesis of SAPO‐34 hierarchical nanocatalyst using ultrasound waves.…”

Section: Introductionmentioning

confidence: 99%

“…(5)) and the genetic algorithm code, the catalyst activity coefficients of different reactions were estimated for different periods of time, process temperatures, and space velocities. (6) The catalyst activity coefficient during the reaction was obtained as a function of time, reaction temperature, and the feed space velocity. The equations were obtained by the genetic programming method.…”

Section: Introductionmentioning

confidence: 99%

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A Dynamic Kinetic Model for Methanol to Light Olefins Reactions over a Nanohierarchical SAPO‐34 Catalyst: Catalyst Synthesis, Model Presentation, and Validation at the Bench Scale

Azarhoosh

Halladj

Askari

2018

Int J of Chemical Kinetics

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This study includes three main parts: synthesizing the hierarchical silicoaluminophosphate (SAPO‐34) catalyst, evaluating the performance of this modified catalyst in the methanol to light olefins (MTO) process, and providing a new dynamic kinetic model for the modified catalyst. At first, a carbon nanotube (CNT) was used as a mesopore template in the sonochemical synthesis of SAPO‐34 hierarchical catalyst. By comparing the performance of this hierarchical catalyst and the common catalyst in the MTO process, it is observed that better performance is obtained on a modified catalysts for a longer period of time. Then, nine process tests were performed in differential fixed bed reactors at different temperatures and space velocities to obtain the kinetic model of the desired catalyst in the MTO process. Finally, the dynamic kinetic model of the modified SAPO‐34 catalyst was considered for main reactions in the MTO process. In this model, the rate equations were assumed elementary and lumped, and the decreasing of the catalyst activity over time on stream was also considered. The reactions constant and catalyst activity coefficient for different reactions were obtained by simultaneous connection of the code related to the reactor model and the genetic algorithm and genetic programming codes. The results obtained from the kinetic model were consistent with the experimental results.

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“…15 Various approaches have been developed to improve SAPO-34 catalytic properties, such as modifying the catalyst acidity, 16,17 optimizing the synthesis conditions, 18 decreasing the crystal size, 19,20 and the introduction of meso-or/and macropores. 21,22 However, there is a rare report about the method which can weaken or passivate SAPO-34 acidity on outer side surface directly.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of core–shell SAPO-34@SAPO-18 composites by the epitaxial growth method and their catalytic properties for the MTO reaction

Qian

et al. 2017

RSC Adv.

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A top-down approach to hierarchical SAPO-34 zeolites with improved selectivity of olefin

Cited by 87 publications

References 52 publications

Synthesis of Hierarchical SAPO‐5 & SAPO‐34 Materials by Post‐Synthetic Alkali Treatment and Their Enhanced Catalytic Activity in Transesterification

Synthesis of Hierarchical SAPO‐5 & SAPO‐34 Materials by Post‐Synthetic Alkali Treatment and Their Enhanced Catalytic Activity in Transesterification

A Dynamic Kinetic Model for Methanol to Light Olefins Reactions over a Nanohierarchical SAPO‐34 Catalyst: Catalyst Synthesis, Model Presentation, and Validation at the Bench Scale

Synthesis of core–shell SAPO-34@SAPO-18 composites by the epitaxial growth method and their catalytic properties for the MTO reaction

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