Precise control of the size of zeolite B-ZSM-5 based on seed surface crystallization

Dai, Chengyi; Li, Junjie; Zhang, Anfeng; Nie, Chaoqun; Chen, Song; Guo, Xinwen

doi:10.1039/c6ra28030g

Cited by 23 publications

(15 citation statements)

References 48 publications

(48 reference statements)

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“…Double peaks are observed at 2θ = 45.2°. From the figure, all samples exhibit similar crystallinity; in the case of different aluminum addition, the alkali treatment did not destroy the framework of B-S-1. , …”

Section: Results and Discussionmentioning

confidence: 83%

“…From the figure, all samples exhibit similar crystallinity; in the case of different aluminum addition, the alkali treatment did not destroy the framework of B-S-1. 13,27 Figure 2 shows the SEM images of the morphology and size of the sample after NaOH + Al(NO 3 ) 3 treatment. By the introduction of the aluminum source during alkali treatment, the morphology of the HBZ5-x-AT sample becomes more regular with the continuous increase in the amount of added aluminum.…”

Section: Methodsmentioning

confidence: 99%

“…For example, during the preparation of ZSM-5, heteroatom B is introduced and applied to the MTP reaction, which can effectively improve the stability of the catalyst. 13 Post-processing methods offer more straightforward diffusion performance for applications to industrial catalysis. 14 Postprocessing methods include acid, 15 steam, and alkali treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, to improve the stability of the catalyst and diffusion performance of the reaction product, some heteroatoms can be introduced during the preparation process. For example, during the preparation of ZSM-5, heteroatom B is introduced and applied to the MTP reaction, which can effectively improve the stability of the catalyst . Post-processing methods offer more straightforward diffusion performance for applications to industrial catalysis .…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Catalysis of Multi-Stage Pore-Rich H-BZSM-5 and Zn-ZSM-5 for the Production of Aromatic Hydrocarbons from Methanol via Lower Olefins

Dai

Chen

et al. 2020

Ind. Eng. Chem. Res.

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In this study, a series of H-BZSM-5 catalysts, rich in porous structures, were prepared by a template-free method followed by an alkali treatment, each of which was combined with a Zn-ZSM-5 catalyst to produce aromatic hydrocarbons from methanol via low-carbon olefins. By separately designing suitable catalysts that satisfy the needs of these two stages, and appropriately matching these two catalysts, the stability of the catalyst and single-pass aromatic production is expected to improve. For two-step coupling to produce aromatic hydrocarbons, the HBZ5-x-AT catalyst (H-BZSM-5 treated with NaOH + Al(NO3)3) was selected for the conversion of methanol to low-carbon olefins. Adding an appropriate amount of aluminum during the alkali treatment can suppress the over-etching of the silicon-rich region inside the crystal and, at the same time, aluminum atoms and boron atoms undergo isomorphous substitution. While introducing continuous mesopores, some strong acid sites are introduced, significantly improving the stability of B-ZSM-5 in the methanol-to-olefin (Step 1) reaction. The HBZ5-27-AT catalyst has a suitable catalyst lifetime, high C2 =–C4 = intermediate product selectivity, with a total selectivity of 73%, which is beneficial to subsequent olefin aromatization. The Zn-ZSM-5 catalyst was selected for the preparation of aromatics from low-carbon olefins (Step 2). Considering the effect of the composite method and ratio of the two kinds of catalysts on the performance of the two-step coupled aromatic production, it is concluded that, when the composite catalyst has upper and lower layer filling and the ratio is 3:7, compared with the traditional Zn-modified ZSM-5, the stability of the catalyst was increased from 3 to 194 h, and the single-pass aromatic production increased from 0.15 to 4.98 g/g catalyst.

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Section: Results and Discussionmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synergistic Catalysis of Multi-Stage Pore-Rich H-BZSM-5 and Zn-ZSM-5 for the Production of Aromatic Hydrocarbons from Methanol via Lower Olefins

Dai

Chen

et al. 2020

Ind. Eng. Chem. Res.

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“…The silicalite-1 zeolite seed was synthesized using the procedure used by Dai et al [39] with a little modification. TEOS (50 g) was mixed with TPAOH ________________________________________________ Egypt.…”

Section: Synthesis Of the Silicalite-1 Zeolite Seedmentioning

confidence: 99%

Novel Superparamagnetic Nanocomposite of Core-Shell Magnetic Zeolite Coated With Chitosan Crosslinked by Glutaraldehyde: Synthesis and Characterization

Suyanta

Falah²,

Nugroho

et al. 2021

Egypt. J. Chem.

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In the present study, a novel superparamagnetic nanocomposite composed of magnetite as the core and zeolite coated by glutaraldehyde-crosslinked chitosan as the shell has been successfully synthesized. The synthesis steps include coating silica on the surface of magnetite nanoparticles and conversion of the silica layer into a zeolite layer, coating of chitosan on the surface of the zeolite, and cross-linking reaction of chitosan using glutaraldehyde. The X-ray diffractogram has proven that the magnetite nanoparticles formed on the nanocomposite have a cubic structure. The formation of the minerals mordenite, clinoptilolite, and quartz on the magnetite surface is also confirmed. Infrared spectral analysis has revealed the existence of Fe-O-Si and Fe-O-Al bonds between magnetite and zeolite, and C=N bonds between chitosan and glutaraldehyde. The TEM image clearly shows that the resulting nanocomposite consists of zeolite-coated magnetite nanoparticles, which are incorporated in a glutaraldehyde crosslinked chitosan gel system. Measurements with ImageJ software suggest that the diameter of the composite is in the range of 20-75 nm, with an average diameter of 34.06 nm. Magnetic studies indicate that the nanocomposite is superparamagnetic with a saturation magnetization of 27.5 emu/g. Since the magnetite nanoparticles is positioned in the core of the composite, it is well protected from oxidation and therefore it is expected to have high magnetic stability. This magnetically separable nanocomposite is quite interesting and may be applied in the adsorption of heavy metal ions and cationic dyes from aquatic medium.

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Core–Shell HZSM-5@silicalite-1 Composite: Controllable Synthesis and Catalytic Performance in Alkylation of Toluene with Methanol

Dong

et al. 2020

Catal Lett

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Precise control of the size of zeolite B-ZSM-5 based on seed surface crystallization

Abstract: A unified functionD3=d3D03/[xD03+ (1 −x)d3] is established to precise control and predict the particle size of B-ZSM-5 from 153 nm to 14.2 μm in the TPABr and/or TPAOH synthetic systems.

Cited by 23 publications

References 48 publications

Synergistic Catalysis of Multi-Stage Pore-Rich H-BZSM-5 and Zn-ZSM-5 for the Production of Aromatic Hydrocarbons from Methanol via Lower Olefins

Synergistic Catalysis of Multi-Stage Pore-Rich H-BZSM-5 and Zn-ZSM-5 for the Production of Aromatic Hydrocarbons from Methanol via Lower Olefins

Novel Superparamagnetic Nanocomposite of Core-Shell Magnetic Zeolite Coated With Chitosan Crosslinked by Glutaraldehyde: Synthesis and Characterization

Core–Shell HZSM-5@silicalite-1 Composite: Controllable Synthesis and Catalytic Performance in Alkylation of Toluene with Methanol

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