scholarly journals Selective Production of Aromatics from 2-Octanol on Zinc Ion-Exchanged MFI Zeolite Catalysts

Catalysts ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 2122-2133 ◽  
Author(s):  
Masakazu Iwamoto ◽  
Ryota Takezawa ◽  
Masao Morimoto
Keyword(s):  
Zinc Ion ◽  
Zeolite Catalysts ◽  
Mfi Zeolite

Study of active sites on the MFI zeolite catalysts for the transformation of ethanol into propylene

2010 ◽  
Vol 328 (1-2) ◽  
pp. 114-118 ◽  
Author(s):  
Wei Xia ◽  
Atsushi Takahashi ◽  
Isao Nakamura ◽  
Hiromichi Shimada ◽  
Tadahiro Fujitani
Keyword(s):  
Active Sites ◽  
Zeolite Catalysts ◽  
Mfi Zeolite

scholarly journals Catalytic Properties of Microporous Zeolite Catalysts in Synthesis of Isosorbide from Sorbitol by Dehydration

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 148 ◽  
Author(s):  
Sangmin Jeong ◽  
Ki-Joon Jeon ◽  
Young-Kwon Park ◽  
Byung-Joo Kim ◽  
Kyong-Hwan Chung ◽  
...  
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Acid Strength ◽  
Zeolite Catalysts ◽  
Mfi Zeolite ◽  
Pore Characteristics ◽  
Bea Zeolite ◽  
Small Pore ◽  
By Products

As bisphenol A has been found to cause hormonal disturbances, the natural biomaterial isosorbide is emerging as a substitute. In this study, a method for isosorbide synthesis from sorbitol was proposed by dehydration under high temperature and high pressure reaction. Microporous zeolites and Amberlyst 35 solid acids with various acid strengths and pore characteristics were applied as catalysts. In the synthesis of isosorbide from sorbitol, the acidity of the catalyst was the main factor. MOR and MFI zeolite catalysts with high acid strength and small pore size showed low conversion of sorbitol and low yield of isosorbide. On the other hand, the conversion of sorbitol was high in BEA zeolite with moderate acid strength. Amberlyst 35 solid acid catalysts showed a relatively high conversion of sorbitol, but low yield of isosorbide. The Amberlyst 35 solid acid catalyst without micropores did not show any inhibitory effects on the production of by-products. However, in the BEA zeolite catalyst, which has a relatively large pore structure compared with the MOR and MFI zeolites, the formation of by-products was suppressed in the pores, thereby improving the yield of isosorbide.

Conversion of Methane Using Mo–MFI Zeolite Catalyst

2012 ◽  
Author(s):  
Nor Aishah Saidina Amin ◽  
Norzita Ngadi ◽  
Didik Prasetyoko
Keyword(s):  
Direct Synthesis ◽  
Synthesis Method ◽  
Packed Bed ◽  
Catalytic Performance ◽  
Zeolite Catalysts ◽  
Packed Bed Reactor ◽  
Mfi Zeolite ◽  
Molybdenum Metal ◽  
Defect Sites ◽  
Temperature Programmed

HZSM-5 (Si/Al = 30), silikalit dan Mo-MFI dengan kepekatan logam molibdenum yang berbeza telah disintesis secara kaedah langsung. Sampel-sampel mangkin ini dicirikan dengan menggunakan teknik pembelauan sinar-X (XRD), Spektroskopi Inframerah Fourier Transformasi (FTIR) dan penjerapan suhu teraturcara bagi Ammonia (TPD-NH3). Prestasi pemangkinan sampel-sampel ini dijalankan di dalam reaktor aliran berterusan lapisan terpadat mikro. Kesan kandungan logam dalam mangkin terhadap penukaran metana dan kadar kepilihan terhadap produk dikaji. Hasil pencirian menunjukkan bahawa sampel-sampel tersebut adalah mempunyai struktur seperti MFI-zeolit dan logam molibdenum yang hadir berkemungkinan besar terletak di tapak cacat zeolit. Ubahsuaian zeolit dengan logam memberi kesan kepada peningkatan aktiviti pemangkinan. Keputusan eksperimen yang menggunakan Mo(0.1)-MFI menunjukkan kepilihan C1-oksigenat yang tinggi. Walau bagaimanapun, mangkin Mo-MFI didapati tidak sesuai untuk penghasilan gasolin. Kata kunci: MO-MFI, sintesis langsung, XRD, FTIR, TPD-NH HZSM-5 (Si/Al = 30), silicalite and Mo-MFI with different molybdenum concentrations were synthesized by direct synthesis method. The catalyst samples were characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy and Temperature Programmed Desorption of Ammonia (TPD-NH3) techniques. The catalytic performance of the samples was evaluated in a continuous micro packed-bed reactor. The effects of metal content on methane conversion and products selectivity were investigated. Characterization results revealed that the samples were MFI-zeolite catalysts and the molybdenum metal most probably occluded in the defect sites of the zeolite. Modification of zeolite with metal resulted in the enhancement of catalytic activation. The experimental results using Mo(0.1)-MFI demonstrated a high selectivity of C1-oxygenates. However, Mo-MFI catalyst was found not suitable for gasoline production. Key words: MO-MFI, direct synthesis, XRD, FTIR, TPD-NH

The Production of LPG Using Low-octane Model-feed (n-Hexane) on Modified Unloaded and Pt-loaded MFI Zeolite Catalysts

2015 ◽  
Vol 33 (3) ◽  
pp. 363-373
Author(s):  
A. K. Aboul-Gheit ◽  
N. A. K. Aboul-Gheit ◽  
E. A. Emam ◽  
S. M. Abdel-Hamid
Keyword(s):  
Zeolite Catalysts ◽  
Mfi Zeolite

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 Investigating the influence of acid sites in continuous methane oxidation with N2O over Fe/MFI zeolites

2018 ◽  
Vol 8 (1) ◽  
pp. 154-163 ◽  
Author(s):  
Ying Kit Chow ◽  
Nicholas F. Dummer ◽  
James H. Carter ◽  
Christopher Williams ◽  
Greg Shaw ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Acid Sites ◽  
Zeolite Catalysts ◽  
Mfi Zeolite ◽  
Mfi Zeolites

Methane oxidation using N2O was carried out with Fe–MFI zeolite catalysts at 300 °C.

scholarly journals Acidic and Catalytic Properties of Zeolites Modified by Zinc in the Conversion Process of Lower C3–C4 Alkanes

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 421
Author(s):  
Vladimir Erofeev ◽  
Vyacheslav Khasanov ◽  
Sofia Dzhalilova ◽  
Wladimir Reschetilowski ◽  
Anna Syskina ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Catalytic Properties ◽  
Zeolite Catalysts ◽  
Conversion Process ◽  
Additive Concentration ◽  
Liquid Hydrocarbons ◽  
Mfi Zeolite ◽  
Acid Properties ◽  
Alcohol Fraction ◽  
High Silica

The acid and catalytic properties of the modified MFI zeolite catalysts during the conversion of the propane–butane fraction of the associated petroleum gases into the aromatic hydrocarbons were studied. It was established that the high-silica zeolites synthesized with the new structure-forming additive of the alcohol fraction (ZKE-AF) belong to the high-silica MFI zeolites. The resulting zeolites were modified by 1–5 wt. % additives consisting of zinc oxide and sulfide. The influence of the modifying additive concentration containing zinc oxides and sulfides in an amount of 1–5% on the acid and catalytic properties of the catalysts in the conversion process of lower C3–C4 alkanes into liquid hydrocarbons was studied. The research of the acid properties of the modified zeolite catalysts by thermal desorption of ammonia showed that the total concentrations of the acidic centers of H-ZKE-AF modified by 3% and 5% ZnO increased. It was found that the highest yield of liquid hydrocarbons was on the zeolite catalysts modified by 3% and 5% ZnS, and is 60.6% and 60.5%, respectively, which is 9% more than in the initial H-ZKE-AF. The activity of the zeolite catalysts modified by zinc oxide and zinc sulfide was in correlation with their acid properties.

scholarly journals Linear Hexane Isomerization Over Bimetallic Zeolite Catalysts

2021 ◽  
Vol 15 (3) ◽  
pp. 330-335
Author(s):  
Lyubov Patrylak ◽  
◽  
Oleksandra Pertko ◽  
Yuliya Voloshyna ◽  
Angela Yakovenko ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Maximum Yield ◽  
Nitrogen Adsorption ◽  
Zeolite Catalysts ◽  
Optimum Process ◽  
Mfi Zeolite ◽  
Hydrogen Form ◽  
Alkane Isomerization ◽  
Adsorption Desorption ◽  
Palladium Content

The aim of this study was to evaluate the activity and selectivity in isomerization of n-hexane of bimetallic zeolite catalysts containing a nickel transition metal in addition to palladium. Bimetallic bifunctional linear alkane isomerization catalysts based on the hydrogen form of MFI zeolite have been synthesized. The porous properties of the samples were investigated by means of low-temperature nitrogen adsorption/desorption, the size of the metal component – by TEM, and the catalytic properties – in the micro-pulse isomerization of n-hexane. Antisymbatic correlation between the temperature of the maximum yield of hexane isomers and the amount of nickel in the sample was found for a stable palladium content. The introduction of nickel allows to reduce the optimum process temperature from 598 to 523 K.

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