One-pot hydrothermal synthesis of nanostructured ZrAPSO-34 powder: Effect of Zr-loading on physicochemical properties and catalytic performance in conversion of methanol to ethylene and propylene

Aghaei, Erfan; Haghighi, Mohammad; Pazhohniya, Zahra; Aghamohammadi, Sogand

doi:10.1016/j.micromeso.2016.02.009

Cited by 66 publications

(39 citation statements)

References 51 publications

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“…In recent years, production of light olefins has received wide attention due to the increasing global demand for ethylene and propylene . Currently, light olefins production, especially propylene, is not sufficient for world demand .…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, production of light olefins has received wide attention due to the increasing global demand for ethylene and propylene. 1,2 Currently, light olefins production, especially propylene, is not sufficient for world demand. 3 Propylene is one of the most important raw materials in petrochemical industries and recently, due to the rapid increasing demand for it, petrochemical industries are facing a serious supply deficit.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

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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“…This molecular sieve has the flexibility of altering the ratio between the two olefins by varying the operating conditions . In general, the main problem with these catalysts in industrial processes is their short life due to the coke formation . Thus, a number of efforts have been performed to improve the lifetime and the selectivity of light olefins through modification of SAPO‐34 catalyst .…”

Section: Introductionmentioning

confidence: 99%

“…Isomorphous substitution of Al (III) with a divalent metal ion is one of the appropriate alternatives as it allows the control of acidity by creating new acid sites and, consequently, increasing the catalyst lifetime. When heteroatoms are substituted into the framework, only minor perturbations to the electronic structure are formed . As a result, a heteroatom will replace more readily with the aluminium and Brønsted acid sites created in the SAPO pores .…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that the synthesized catalyst with 0.05 molar ratio of ZrO 2 in initial gel showed good catalytic performance in MTO process. Therefore, the NiAPSO‐34, MnAPSO‐34, and MnNiAPSO‐34 catalysts were synthesized with 0.05 molar ratios of NiO and MnO in initial gel ( x : y = 0:0.05, 0.05:0, and 0.05:0.05) . In addition, here, Mn(II) and Ni(II) ions are considered to exclusively substitute for Al(III).…”

Section: Introductionmentioning

confidence: 99%

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Incorporation of mono and bimetallic MnNi into SAPO‐34 framework used in conversion of methanol to ethylene and propylene: Alteration of acidic properties and catalytic performance

Sadeghpour

Haghighi

2018

Asia-Pacific J Chem Eng

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Nanostructured Ni, and MnNi) catalysts were synthesized by hydrothermal method using diethylamine (DEA) as template. The influence of Ni, Mn, and MnNi metal ions incorporation into the SAPO-34 framework was investigated on its physicochemical properties and catalytic performance towards methanol to light olefins. The samples were characterized by X-ray diffraction, field emission scanning electron microscopy, particle size distribution, energy dispersive X-ray, Brunner-Emmett-Teller, Fourier transform infrared, UV-vis spectroscopy, and temperature-programmed desorption of ammonia techniques. The results of X-ray diffraction patterns revealed that various metals, based on their unique characteristics, play different roles in the crystallization of SAPO-34 crystalline phase. The energy dispersive X-ray micrographs indicated appropriate distribution of Mn metal ions in comparison with Ni modifier. The catalytic performance of these catalysts showed that the type of metal ions has low effect on methanol conversion, whereas it has considerable effect on stability and products selectivity. The stability of MnAPSO-34 catalyst is much higher than the others. The selectivity of olefins for this sample with a high specific surface area and proper distribution of strong/weak acid sites was about 98% after 10 hr. The main steps of metal ions incorporation into the SAPO-34 framework and a possible reaction mechanism for methanol to light olefins process were discussed in details.

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Synthesis of SAPO‐34 Zeolite from Laponite and Its Application in the MTO Reaction

et al. 2020

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In this work, SAPO‐34 zeolite with high catalytic activity was successfully synthesized by hydrothermal method from laponite as the single Si source. Compared with the traditional method of synthesizing zeolites from clay, the laponite after swelling can be directly used in the synthesis process of zeolite. The crystallization behavior of SAPO‐34 synthesized from laponite was investigated by XRD, FTIR, N2 adsorption–desorption, SEM‐EDX, ICP‐MS, and DR‐UV/Vis. The process can be summarized as follows: the Si and Mg elements were produced by the depolymerization of laponite, then the primary building units of SAPO‐34 zeolite were formed under hydrothermal conditions; finally, the crystal nucleus began to form, and crystallization was triggered. Compared with the conventional SAPO‐34 synthesized from TEOS, the SAPO‐34 synthesized from laponite exhibited higher selectivity to light olefins and longer lifetime, which can be attributed to the suitable strength of acidity. This work points to a straightforward route to the synthesis of SAPO‐34 from laponite.

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One-pot hydrothermal synthesis of nanostructured ZrAPSO-34 powder: Effect of Zr-loading on physicochemical properties and catalytic performance in conversion of methanol to ethylene and propylene

Cited by 66 publications

References 51 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

Incorporation of mono and bimetallic MnNi into SAPO‐34 framework used in conversion of methanol to ethylene and propylene: Alteration of acidic properties and catalytic performance

Synthesis of SAPO‐34 Zeolite from Laponite and Its Application in the MTO Reaction

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