Effect of SiO2/Al2O3 ratio on the performance of nanocrystal ZSM-5 zeolite catalysts in methanol to gasoline conversion

Wan, Zhijian; Wu, Wei; Li, Gang; Wang, Chuanfu; Yang, Hong; Zhang, Dongke

doi:10.1016/j.apcata.2016.05.032

Cited by 113 publications

(52 citation statements)

References 60 publications

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“…So, the aluminum content in S‐54 is higher than that of S‐T. The SAPO‐34 zeolite with high aluminum content was indicative of a high acid site density, and vice versa . This is also in good agreement with the results of TPD.…”

Section: Resultssupporting

confidence: 81%

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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Section: Resultssupporting

confidence: 81%

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

et al. 2020

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“…Hence, the best catalyst for the synthesis of propylene from methanol on the basis of literature results would be nanosized ZSM‐5 crystals with lower acid‐site density. Nanocrystal ZSM‐5 zeolites have already been reported as efficient catalysts in comparison with the micron‐sized counterparts in different catalytic reactions in terms of stability and selectivity …”

Section: Introductionmentioning

confidence: 99%

Tuning Zeolite Properties for a Highly Efficient Synthesis of Propylene from Methanol

Palčić

Ordomsky

Qin

et al. 2018

Chemistry A European J

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A series of nanosized ZSM-5 samples was synthesized at 170, 150, 120, and 100 °C. Experimental data show that the decrease of crystallization temperature leads to significant changes in zeolite properties. Crystals synthesized at 100 °C exhibit many framework defects with lower acid-site density, strength, and a larger external surface area. The selectivity to light olefins and the propylene-to-ethylene ratio increases as the crystallization temperature decreases. A propylene-to-ethylene ratio of above 6 with the highest selectivity to propylene of 53 % was obtained over ZSM-5 catalyst prepared at 100 °C. The stability of the nanosized zeolite in methanol to olefins (MTO) was also improved compared to the industrial sample with a similar Si/Al ratio. This catalytic performance is a result of the decrease in the acid-site density, strength, and the crystals' size, providing a shorter diffusion path and larger external surface area. The presence of structural defects and a different external surface in the crystals has been shown to play an important role in the MTO catalyst performance.

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“…A stable catalytic activity with less carbon deposition can be obtained by increasing the Si/Al ratio moderately. While increasing Si/Al ratio further, the catalytic activity decreased due to decrease of acid sites [115].…”

Section: Acid Amountmentioning

confidence: 99%

Strategies to Enhance the Catalytic Performance of ZSM-5 Zeolite in Hydrocarbon Cracking: A Review

Yang

Yan

2017

Catalysts

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ZSM-5 zeolite is widely used in catalytic cracking of hydrocarbon, but the conventional ZSM-5 zeolite deactivates quickly due to its simple microporous and long diffusion pathway. Many studies have been done to overcome these disadvantages recently. In this review, four main approaches for enhancing the catalytic performance, namely synthesis of ZSM-5 zeolite with special morphology, hierarchical ZSM-5 zeolite, nano-sized ZSM-5 zeolite and optimization of acid properties, are discussed. ZSM-5 with special morphology such as hollow, composite and nanosheet structure can effectively increase the diffusion efficiency and accessibility of acid sites, giving high catalytic activity. The accessibility of acid sites and diffusion efficiency can also be enhanced by introducing additional mesopores or macropores. By decreasing the crystal size to nanoscale, the diffusion length can be shortened. The catalytic activity increases and the amount of carbon deposition decreases with the decrease of crystal size. By regulating the acid properties of ZSM-5 with element or compound modification, the overreaction of reactants and formation of carbon deposition could be suppressed, thus enhancing the catalytic activity and light alkene selectivity. Besides, some future needs and perspectives of ZSM-5 with excellent cracking activity are addressed for researchers' consideration.

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Effect of SiO2/Al2O3 ratio on the performance of nanocrystal ZSM-5 zeolite catalysts in methanol to gasoline conversion

Cited by 113 publications

References 60 publications

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

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

Tuning Zeolite Properties for a Highly Efficient Synthesis of Propylene from Methanol

Strategies to Enhance the Catalytic Performance of ZSM-5 Zeolite in Hydrocarbon Cracking: A Review

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