Aggregates of superfine ZSM-5 crystals: The effect of NaOH on the catalytic performance of methanol to propylene reaction

Chen, Hengbao; Wang, Yaquan; Meng, Fanjun; Sun, Chao; Li, Hongyao; Wang, Zhao; Gao, Fei; Wang, Xiao; Wang, Shuhai

doi:10.1016/j.micromeso.2017.02.014

Cited by 53 publications

(14 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…45 It is worthwhile to note that a unusual hysteresis loop in the N 2 isotherm of the sample HA-250-2S-5H is visible at low relative pressure between 0.10 and 0.30, which is ascribe to a uidto-crystalline phase transition of the adsorbed nitrogen in microporosity. 46 This special phenomenon demonstrates that the nanocrystals of the sample HA-250-2S-5H are well crystallized. 47 The hysteresis loop inseparably linked with uid-tocrystalline phase transition gets larger for the high silica HA-313-2S-5H zeolite.…”

Section: Morphology Observation and Controlmentioning

confidence: 84%

See 1 more Smart Citation

Controllable fabrication of single-crystalline, ultrafine and high-silica hierarchical ZSM-5 aggregates via solid-like state conversion

Wang

Meng

et al. 2017

RSC Adv.

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Morphology Observation and Controlmentioning

confidence: 84%

“…Based on our previous studies 16,19,30,46,[69][70][71][72] and the above discussion, the possible formation mechanism of HA-ZSM-5 is proposed in Scheme 1.…”

Section: Formation Mechanism Of Ha-zsm-5 Zeolitesmentioning

confidence: 98%

Controllable fabrication of single-crystalline, ultrafine and high-silica hierarchical ZSM-5 aggregates via solid-like state conversion

Wang

Meng

et al. 2017

RSC Adv.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Addition of CTAB as mesoporogen in the seed-solution is a well-known strategy as well that leads to assembly of nanostructures, impeding crystal growth. [189][190][191] For economic reasons, the use of a lower amount of CTAB has been studied. Chen et al synthesized 400-600 nm aggregates of 20-50 nm ZSM-5 crystals starting from silicate-1 seeds with no additional templates and trace amounts of CTAB.…”

Section: Zsm-5mentioning

confidence: 99%

“…Addition of CTAB as mesoporogen in the seed‐solution is a well‐known strategy as well that leads to assembly of nanostructures, impeding crystal growth. [ 189–191 ] For economic reasons, the use of a lower amount of CTAB has been studied. Chen et al.…”

Section: Synthesis Of Hierarchical 10‐mr Zeolitesmentioning

confidence: 99%

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

et al. 2020

View full text Add to dashboard Cite

Zeolites are highly crystalline aluminosilicates with welldefined pores that are constructed of SiO 2 and AlO 4 tetrahedra. These tetrahedra can be linked together in different unique ways to form various materials with a specific topology. [1] According to the International Zeolite Association (IZA), more than 250 different topologies, which are all assigned with a three-letter code, have been identified. [2] The micropores in zeolites are typically constructed from 8, 10, or 12 tetrahedral atoms

show abstract

“…Fouad et al 31 minimized the template to the silica mole concentration to 0.215 to synthesize ZSM-5 zeolites. Chen et al 32 studied the effect of varying NaOH concentrations on ZSM-5 properties and their catalytic performance for the methanol-to-propylene reaction using CTAB as the template. There exists a tradeoff between the minimal use of non-green chemicals and preserving the desired properties of the target materials during the synthesis step.…”

Section: Introductionmentioning

confidence: 99%

ZSM-5 Catalysts for MTO: Effect and Optimization of the Tetrapropylammonium Hydroxide Concentration on Synthesis and Performance

2022

View full text Add to dashboard Cite

Light olefin production from methanol using various zeolite catalysts has industrial and economic importance considering the growth of the petrochemical market. Zeolites are generally synthesized using various organic templates as structure-directing agents (SDAs). In this study, synthesis of a series of ZSM-5 zeolites was performed systematically using the microwave-assisted crystallization method, and these samples were analyzed in detail to understand the effect of the SDA concentration. Powder diffraction, N 2 adsorption, scanning electron microscopy, ammonia adsorption desorption, and 27 Al and 29 Si NMR spectroscopies were used for the characterization. The organic SDA tetrapropyl ammonium hydroxide (TPAOH/SiO 2 mole ratio = 0.0500) is found to have an optimum concentration against the silica precursor for achieving the highest crystallinity, suitable morphology, ideal pore size, effective pore volume, and tuned microporous/mesoporous area. For samples with a template concentration ratio of 0.050 or higher, 29 Si and 27 Al NMR data revealed the presence of an intact ZSM-5 structure. Using a fixed bed reactor at 500 °C and atmospheric pressure, the catalytic performance of the selected catalysts from the series is investigated for the methanol-to-olefin conversion reaction. The sample with the highest crystallinity showed the best conversion, selectivity toward light olefins, and time on stream stability. It is also worth noting that the highest crystallinity, micropore area, and micropore volume are reached for the optimum value rather than the highest template concentration. This allows for a reduction in the template concentration and a move closer to a synthesis pathway benign to environment and economics.

show abstract

Aggregates of superfine ZSM-5 crystals: The effect of NaOH on the catalytic performance of methanol to propylene reaction

Cited by 53 publications

References 54 publications

Controllable fabrication of single-crystalline, ultrafine and high-silica hierarchical ZSM-5 aggregates via solid-like state conversion

Controllable fabrication of single-crystalline, ultrafine and high-silica hierarchical ZSM-5 aggregates via solid-like state conversion

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

ZSM-5 Catalysts for MTO: Effect and Optimization of the Tetrapropylammonium Hydroxide Concentration on Synthesis and Performance

Contact Info

Product

Resources

About