Organic template-free synthesis of ZSM-5 zeolite from coal-series kaolinite

Pan, Feng; Lu, Xuchen; Wang, Yun; Chen, Shiwei; Wang, Tizhuang; Yan, Yan

doi:10.1016/j.matlet.2013.10.007

Cited by 57 publications

(36 citation statements)

References 20 publications

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“…6. It can be seen that the synthesized sample exhibits a typical MFI-type zeolite structure like ZSM-5 zeolites which synthesized by TPABr in the presence of Na þ ions [70]. The sample shows uniform crystalline particles with a crystal size of~4e2 mm in length.…”

Section: Resultsmentioning

confidence: 91%

Water-oxidizing activity of ZSM-5 type manganosilicate: The importance of the Mn O Mn bonds

Khatamian

Heidari

Najafpour

2016

International Journal of Hydrogen Energy

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Section: Resultsmentioning

confidence: 91%

Water-oxidizing activity of ZSM-5 type manganosilicate: The importance of the Mn O Mn bonds

Khatamian

Heidari

Najafpour

2016

International Journal of Hydrogen Energy

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“…The zeolite formation can be expressed as (Equation (5) Silicate-based zeolites prepared through the hydrothermal synthesis method have been reported previously [28,29]. Different clay minerals were used as a starting material for zeolite synthesis: kaolinite, montmorillonite, bentonite, halloysite and interstratified illite-smectite.…”

Section: Xrd Analysis Of Alkali-leached Residuementioning

confidence: 99%

Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism

et al. 2017

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Sericite is a typical silicate impurity in microcrystalline graphite ores, and its removal is important in the preparation of high-purity graphite preparations. Alkali-acid leaching is an effective method used to purify graphite and remove silicate minerals. In this study, the dissolution behavior and mechanism of sericite in alkali-acid leaching were investigated. The dissolution of sericite was mainly affected by alkali leaching temperature, sodium hydroxide concentration, and alkali leaching time. According to the XRD, FTIR, and SEM-EDS analyses, the dissolution mechanism of sericite is a three-stage process: (1) sericite is dissolved in the form of soluble silicate and aluminate; (2) the dissolved silicate and aluminate then react with each other to form aluminosilicate; and (3) finally the aluminosilicate mainly composed of hydroxycancrinite and sodalite is almost completely dissolved in the hydrochloric acid solution.

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“…However, rapid deactivation by coke deposition in channels and cages is the main drawback of SAPO‐34 as a catalyst in MTO process. ZSM‐5 catalyst has MFI structure and cages with entrance diameter of 0.55 nm, which are larger compared with SAPO‐34 cages . The Si/Al ratio is a key factor determining acidity and catalytic performance of ZSM‐5.…”

Section: Introductionmentioning

confidence: 99%

“…ZSM-5 catalyst has MFI structure and cages with entrance diameter of 0.55 nm, which are larger compared with SAPO-34 cages. 29,30 The Si/Al ratio is a key factor determining acidity and catalytic performance of ZSM-5. Since, ZSM-5 with a higher Si/Al ratio has moderate acidity, it is considered as an effective catalyst for production of light olefins.…”

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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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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Organic template-free synthesis of ZSM-5 zeolite from coal-series kaolinite

Cited by 57 publications

References 20 publications

Water-oxidizing activity of ZSM-5 type manganosilicate: The importance of the Mn O Mn bonds

Water-oxidizing activity of ZSM-5 type manganosilicate: The importance of the Mn O Mn bonds

Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism

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

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