Synthesis of mesoporous MFI zeolite by dry gel conversion with ZnO particles and the catalytic activity on TMB cracking

2015 ◽  
Vol 23 (2) ◽  
pp. 311-316 ◽  
Author(s):  
Koji Miyake ◽  
Mayuka Yamada ◽  
Yusuke Sugiura ◽  
Yuichiro Hirota ◽  
Yoshiaki Uchida ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mfi Zeolite ◽  
Dry Gel Conversion ◽  
Zno Particles

scholarly journals Surfactant-assisted microwave processing of ZnO particles: a simple way for designing the surface-to-bulk defect ratio and improving photo(electro)catalytic properties

RSC Advances ◽  
2019 ◽  
Vol 9 (30) ◽  
pp. 17165-17178 ◽  
Author(s):  
Smilja Marković ◽  
Ivana Stojković Simatović ◽  
Sanita Ahmetović ◽  
Ljiljana Veselinović ◽  
Stevan Stojadinović ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Microwave Synthesis ◽  
Light Absorption ◽  
Catalytic Properties ◽  
Absorption Capacity ◽  
Visible Light Absorption ◽  
Zno Particles ◽  
Electro Catalytic Activity ◽  
Surfactant Assisted

Employing CTAB in the microwave synthesis of ZnO particles enables improvement of their visible light absorption capacity and photo(electro)catalytic activity.

scholarly journals On the Anti-Corrosion Property of Dry-Gel-Conversion-Grown MFI Zeolite Coating on Aluminum Alloy

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4595
Author(s):  
Shang-Tien Tsai ◽  
Wen-Chyuan ChangJean ◽  
Lin-Yi Huang ◽  
Tseng-Chang Tsai
Keyword(s):  
Fumed Silica ◽  
Thick Layer ◽  
Surface Hydrophobicity ◽  
Corrosion Property ◽  
Mfi Zeolite ◽  
Dry Gel Conversion ◽  
Zeolite Film ◽  
Protection Property ◽  
Strong Barrier ◽  
Zeolite Coating

MFI zeolite film coated on AA6061 alloy was prepared from fumed silica modified with/without n-octyldecyltrimethoxysilane (ODS) by means of dry gel conversion (DGC) method. The DGC-grown MFI zeolite film could form a strong barrier to protect AA6061 surface against the corrosion from NaCl solution. By using fumed silica as a starting material, the hydrophilicity and anti-corrosion capability of the MFI zeolite film declined with increasing humidity in the DGC synthesis. By silanization with ODS, the surface hydrophobicity of the MFI zeolite film increased, leading to substantial enhancement in anti-corrosion capability. On the other hand, MFI film grown from ODS-modified fumed silica exhibited low hydrophilicity and a much improved anti-corrosion protection property by four orders of magnitude, even stronger than the ODS post-treated MFI film. The strong anti-corrosion capability is attributed to the “thick layer” surface hydrophobicity of zeolite crystal.

Mesoporous MFI zeolite material from silica–alumina/epoxy-resin composite material and its catalytic activity

2011 ◽  
Vol 142 (1) ◽  
pp. 381-388 ◽  
Author(s):  
Masahiro Fujiwara ◽  
Akinori Sakamoto ◽  
Kumi Shiokawa ◽  
Astam K. Patra ◽  
Asim Bhaumik
Keyword(s):  
Composite Material ◽  
Catalytic Activity ◽  
Epoxy Resin ◽  
Resin Composite ◽  
Mfi Zeolite ◽  
Epoxy Resin Composite ◽  
Silica Alumina

scholarly journals A Comparative Study of MFI Zeolite Derived from Different Silica Sources: Synthesis, Characterization and Catalytic Performance

Catalysts ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 13 ◽  
Author(s):  
Jianguang Zhang ◽  
Xiangping Li ◽  
Juping Liu ◽  
Chuanbin Wang
Keyword(s):  
Comparative Study ◽  
Raw Materials ◽  
Catalytic Performance ◽  
Crystallization Time ◽  
Particle Sizes ◽  
Mfi Zeolite ◽  
X Ray ◽  
Dry Gel Conversion ◽  
Silica Source ◽  
Fluorescence Spectrometer

In this paper, a comparative study of MFI zeolite derived from different silica sources is presented. Dry gel conversion (DGC) method is used to synthesize silicalite-1 and ZSM-5 with MFI structure. Two kinds of silica sources with different particle sizes are used during the synthesis of MFI zeolite. The as-prepared samples were characterized by X-ray diffraction (XRD), N2-sorption, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and X-ray fluorescence spectrometer (XRF). From the characterization results, it could be seen that the high-quality coffin-like silicalite-1 was synthesized using silica sphere with particle size of 300 nm as silica source, with crystallization time being shortened to 2 h. The schematic diagram of silicalite-1 formation using silica sources with different particle sizes is summarized. ZSM-5 was obtained by adding Al atoms to raw materials during the synthesis of MFI zeolite. The performance of aqueous phase eugenol hydrodeoxygenation over Pd/C-ZSM-5 catalyst is evaluated.

Performance of MFI Zeolite Catalysts in n-heptane Conversion Reaction Test

2018 ◽  
Vol 69 (9) ◽  
pp. 2420-2424
Author(s):  
Iuliean Vasile Asaftei ◽  
Neculai Catalin Lungu ◽  
Ioan Gabriel Sandu ◽  
Adrian Florin Spac ◽  
Maria Ignat
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Pulse Method ◽  
Zeolite Catalysts ◽  
Activity Measurement ◽  
Zinc Ions ◽  
Mfi Zeolite ◽  
Reaction Test ◽  
Main Components ◽  
Heptane Conversion

The aromatization of n-heptane, one of the main components of light naphtha, has been investigated over HZSM-5 (Si/Al = 33.9) and Zn-HZSM-5: Zn1-HZSM-5 (0.86% Zn); Zn2-HZSM-5 (1.35% Zn) and Zn3-HZSM-5 (2.89% Zn) catalysts prepared by the ion exchange with 10M aqueous solution of Zn(NO3)2. The catalytic activity measurement was performed by the chromatographic pulse method in the temperature range of 673 - 823K. The presence of zinc in Zn-HZSM-5 catalysts provided a significant increase in total aromatics selectivity due to the improvement of dehydrogenation activity by Zn incorporation. The Zn species facilitated the aromatization by converting paraffin�s into corresponding olefins which, in turn, were the aromatics precursors. Therefore, both acidity and zinc incorporation played important roles in the aromatization of n-heptane. Over 773 K the activity and selectivity of the Zn-HZSM-5 catalysts decrease very probably due to the loss of zinc ions.

scholarly journals Hollow MFI Zeolite Supported Pt Catalysts for Highly Selective and Stable Hydrodeoxygenation of Guaiacol to Cycloalkanes

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 362 ◽  
Author(s):  
Xiaopo Niu ◽  
Fuxiang Feng ◽  
Gang Yuan ◽  
Xiangwen Zhang ◽  
Qingfa Wang
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Acid Sites ◽  
Pt Catalyst ◽  
Pt Catalysts ◽  
Mfi Zeolite ◽  
Long Term Stability ◽  
Supported Pt Catalysts ◽  
Hierarchical Porous ◽  
Ft Ir

Hollow Silicalite-1 and ZSM-5 zeolites with hierarchical porous shells have been synthesized by using a dissolution-recrystallization method. The morphology, structure, and acidity of these zeolites supported Pt catalysts were characterized by XRD, FT-IR, MAS-SSNMR, FE-SEM, FE-TEM, N2-BET, XPS, NH3-TPD, and CO pulse chemisorption. Compared to the conventional ZSM-5 supported Pt catalyst, the special structure in hollow ZSM-5 zeolite significantly promotes the dispersion of metallic Pt and the synergistic effect between metal active sites and acid sites. These boost the catalytic activity, selectivity of guaiacol hydrodeoxygenation toward cycloalkanes and long-term stability over the Pt/hollow ZSM-5 catalyst combined with improved mass transfer of products and reactants derived from the hierarchical hollow porous structure. Moreover, the Pt/hollow ZSM-5 catalyst exhibits excellent low temperature catalytic activity to completely transform guaiacol into cycloalkanes with the cyclohexane selectivity of more than 93% at 220 °C, suggesting that hollow ZSM-5 zeolite is a promising support for upgrading of bio-oils.

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