Conventional hydrothermal synthesis of nanostructured H-ZSM-5 catalysts using various templates for light olefins production from methanol

Yaripour, Fereydoon; Shariatinia‬, Zahra; Sahebdelfar, Saeed; Irandoukht, Akbar

doi:10.1016/j.jngse.2014.12.001

Cited by 80 publications

(39 citation statements)

References 42 publications

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“…Peaks vibration of the Z100 sample are in well accordance with reported results for ZSM‐5 in the literature . The peaks at wavenumbers of around 400–1,400 cm −1 are due to the structural characteristic vibration of SAPO‐34 and ZSM‐5 catalysts . The peak at 460 cm −1 indicated that the Si and Al incorporated in tetrahedral structure of ZSM‐5 and composite catalysts.…”

Section: Resultssupporting

confidence: 88%

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Enhanced stability and propylene yield in methanol to light olefins conversion over nanostructured SAPO‐34/ZSM‐5 composite with various SAPO‐loadings

Mohammadkhani

Haghighi

Aghaei

2018

Asia-Pacific J Chem Eng

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Nanostructured core‐shell silicoaluminophosphate (SAPO)‐34/zeolite socony mobil (ZSM)‐5 composite has been synthesized with various SAPO‐34 loadings in order to control light olefins selectivity and increase its lifetime in methanol to olefins process. Physicochemical properties and catalytic performance of SAPO‐34/ZSM‐5 composite catalyst were different, compared with the parent SAPO‐34 and ZSM‐5. As‐synthesized samples were characterized by different methods such as X‐Ray diffraction, field emission scanning electron microscopy, Brunauer–Emmett–Teller, energy‐dispersive X‐ray, Fourier transform infrared spectroscopy, and NH3‐temperature‐programmed desorption techniques. By increasing SAPO‐34 content in composite catalysts, relative crystallinity of CHA‐phase (chabazite) was enhanced, whereas it was decreased for MFI‐phase. Also, surface area improved by increasing SAPO‐34 loading in core‐shell composite catalysts. The results of the activity test showed that lifetime remarkably increased by using composite catalysts. Compared with the parent SAPO‐34 and ZSM‐5, the composite catalyst with 80% SAPO‐34 loading showed higher methanol conversion and olefins selectivity with time on stream. This is due to the synergic effect between SAPO‐34 and ZSM‐5 zeolites in composite catalyst.

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Section: Resultssupporting

confidence: 88%

“…Various catalysts such as silicoaluminophosphate (SAPO)‐5, SAPO‐11, SAPO‐17, SAPO‐18, SAPO‐35, zeolite socony mobil (ZSM)‐5, and SAPO‐34 have been used in MTO process . SAPO‐34 and ZSM‐5 zeolites are the most promising catalysts for this process .…”

Section: Introductionmentioning

confidence: 99%

Enhanced stability and propylene yield in methanol to light olefins conversion over nanostructured SAPO‐34/ZSM‐5 composite with various SAPO‐loadings

Mohammadkhani

Haghighi

Aghaei

2018

Asia-Pacific J Chem Eng

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“…Industrialized MTO process or methanol-to-propylene (MTP) process produces ethylene and propylene as the main products [2,3]. However, the C4 fraction, which was produced from naphtha cracking as a co-product of ethylene and propylene, has to be produced from petroleum.…”

Section: Introductionmentioning

confidence: 99%

Near-Graphite Coke Deposit on Nano-HZSM-5 Aggregates for Methanol to Propylene and Butylene Reaction

Sang

Wang

et al. 2017

Catalysts

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Nanocrystal HZSM-5 zeolite aggregates with different SiO 2 /Al 2 O 3 molar ratios were prepared under low temperature and were used to catalyze the conversion of methanol to propylene and butene. The coke location, coke content, and coke species deposited on HZSM-5 aggregates were investigated. The near-graphite carbon on the external surface of HZSM-5 zeolite (SiO 2 /Al 2 O 3 molar ratio = 400) was distinguished by transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS). The carbon distributions in the micropores and on the external surface of the spent HZSM-5 were revealed by thermogravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET) results. Coke preferred to deposit in the mircopores of low SiO 2 /Al 2 O 3 molar ratio samples (200, 300) with relatively uniform Al distribution, while coke also preferred to deposit on the external surface and in the intergranular spaces of high SiO 2 /Al 2 O 3 molar ratio sample (400) with an obviously poor Al core and rich Al shell.

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“…Due to the increasing global demand for propylene and the shortage of petroleum resource in the future, new processes with high yield of propylene are required [1,2]. Both methanol-to-olefins (MTO) and methanol-to-propylene (MTP) processes are prominent alternative routes for producing propylene from nonpetroleum resources, since methanol can be economically produced from natural gas and coal on a large scale [3][4][5]. The MTO technology has been commercialized by UOP/ Hydro for producing both ethylene and propylene based on a SAPO-34 catalyst in a fluidized bed rector, whereas the MTP process has been developed by Lurgi to produce propylene preferentially based on a ZSM-5 catalyst in a fixed-bed reactor [6,7].…”

Section: Introductionmentioning

confidence: 99%

Selective production of propylene from methanol over high-silica mesoporous ZSM-5 zeolites treated with NaOH and NaOH/tetrapropylammonium hydroxide

Ahmadpour

Taghizadeh

2015

Comptes Rendus. Chimie

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Conventional hydrothermal synthesis of nanostructured H-ZSM-5 catalysts using various templates for light olefins production from methanol

Cited by 80 publications

References 42 publications

Enhanced stability and propylene yield in methanol to light olefins conversion over nanostructured SAPO‐34/ZSM‐5 composite with various SAPO‐loadings

Enhanced stability and propylene yield in methanol to light olefins conversion over nanostructured SAPO‐34/ZSM‐5 composite with various SAPO‐loadings

Near-Graphite Coke Deposit on Nano-HZSM-5 Aggregates for Methanol to Propylene and Butylene Reaction

Selective production of propylene from methanol over high-silica mesoporous ZSM-5 zeolites treated with NaOH and NaOH/tetrapropylammonium hydroxide

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