scholarly journals Nano-scale Insights Regarding Coke Formation in Zeolite SSZ-13 Subject to the Methanol-to-Hydrocarbons Reaction

2022 ◽  
Author(s):  
Sophie van Vreeswijk ◽  
Matteo Monai ◽  
Ramon Oord ◽  
Joel Edward Schmidt ◽  
Eelco T.C. Vogt ◽  
...  
Keyword(s):  
Coke Formation ◽  
Nano Scale ◽  
Commercial Interest ◽  
Methanol To Hydrocarbons

The methanol-to-hydrocarbons (MTH) process, commonly catalyzed by zeolites, is of great commercial interest and therefore widely studied both in industry and academia. However, zeolite-based catalyst materials are notoriously hard to...

Transformation of methanol to hydrocarbons over Y zeolites with varying Si/Al ratio

1987 ◽  
Vol 52 (7) ◽  
pp. 1701-1707 ◽  
Author(s):  
Miloslav Křivánek ◽  
Nguyen Thiet Dung ◽  
Pavel Jírů
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Coke Formation ◽  
Aliphatic Hydrocarbons ◽  
Y Zeolite ◽  
Y Zeolites ◽  
Methanol To Hydrocarbons

The catalytic activity of Na, H-Y zeolite samples with a varying Si/Al ratio (2·5 to 20) in the transformation of methanol was determined. The amounts of formed individual aliphatic hydrocarbons as function of reaction time were correlated with the amount of Bronsted and Lewis centres on the catalysts. The effect of coke formation on the over-all course of the reaction has been demonstrated.

scholarly journals Porosity Design of Shaped Zeolites for Improved Catalyst Lifetime in the Methanol-to-Hydrocarbons Reaction

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 545 ◽  
Author(s):  
Rogéria Bingre ◽  
Renna Li ◽  
Qiang Wang ◽  
Patrick Nguyen ◽  
Thomas Onfroy ◽  
...  
Keyword(s):  
Pore Volume ◽  
Active Sites ◽  
Coke Formation ◽  
Effective Diffusivity ◽  
Nitrogen Adsorption ◽  
Breakthrough Time ◽  
Methanol To Hydrocarbons ◽  
Catalytic Stability ◽  
Temperature Programmed ◽  
Adsorption Desorption

Additional porosity, such as meso- and macropores, was introduced in zeolite extrudates with the intention intuit of improving the effective diffusivity of the catalysts. The samples were characterized in depth by nitrogen adsorption-desorption, mercury intrusion porosimetry, ammonia temperature programmed desorption and adsorption of pyridine followed by infrared spectroscopy. The results revealed no significant change in the acidity but an increase of the pore volume. According to significant improvement in the effective diffusivity, the samples were tested in the methanol-to-hydrocarbons reaction. The catalytic stability was greatly enhanced with an increase in the pore volume, demonstrating a relation between effective diffusivity and resistance to deactivation by coke formation. Further experiments also revealed a higher toluene adsorption capacity and a raise in the breakthrough time over the most porous samples due to better accessibility of toluene molecules into the active sites of the zeolite.

scholarly journals Coke Formation in a Zeolite Crystal During the Methanol‐to‐Hydrocarbons Reaction as Studied with Atom Probe Tomography

2016 ◽  
Vol 55 (37) ◽  
pp. 11173-11177 ◽  
Author(s):  
Joel E. Schmidt ◽  
Jonathan D. Poplawsky ◽  
Baishakhi Mazumder ◽  
Özgün Attila ◽  
Donglong Fu ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Coke Formation ◽  
Atom Probe ◽  
Zeolite Crystal ◽  
Methanol To Hydrocarbons

Catalyst deactivation by coke formation in microporous and desilicated zeolite H-ZSM-5 during the conversion of methanol to hydrocarbons

2013 ◽  
Vol 307 ◽  
pp. 62-73 ◽  
Author(s):  
Francesca Lønstad Bleken ◽  
Katia Barbera ◽  
Francesca Bonino ◽  
Unni Olsbye ◽  
Karl Petter Lillerud ◽  
...  
Keyword(s):  
Catalyst Deactivation ◽  
Coke Formation ◽  
Methanol To Hydrocarbons

scholarly journals Coke Formation in a Zeolite Crystal During the Methanol-to-Hydrocarbons Reaction as Studied with Atom Probe Tomography

2016 ◽  
Vol 128 (37) ◽  
pp. 11339-11343 ◽  
Author(s):  
Joel E. Schmidt ◽  
Jonathan D. Poplawsky ◽  
Baishakhi Mazumder ◽  
Özgün Attila ◽  
Donglong Fu ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Coke Formation ◽  
Atom Probe ◽  
Zeolite Crystal ◽  
Methanol To Hydrocarbons

An analytical microscopic study of metals in fluidized catalytic cracking catalyst

1986 ◽  
Vol 44 ◽  
pp. 854-855
Author(s):  
Clifford S. Rainey
Keyword(s):  
Electron Microscopy ◽  
Spatial Distribution ◽  
Catalytic Cracking ◽  
Catalyst Deactivation ◽  
Coke Formation ◽  
Acid Sites ◽  
Y Zeolite ◽  
Fcc Catalyst ◽  
Fluidized Catalytic Cracking ◽  
High Regeneration

The spatial distribution of V and Ni deposited within fluidized catalytic cracking (FCC) catalyst is studied because these metals contribute to catalyst deactivation. Y zeolite in FCC microspheres are high SiO2 aluminosilicates with molecular-sized channels that contain a mixture of lanthanoids. They must withstand high regeneration temperatures and retain acid sites needed for cracking of hydrocarbons, a process essential for efficient gasoline production. Zeolite in combination with V to form vanadates, or less diffusion in the channels due to coke formation, may deactivate catalyst. Other factors such as metal "skins", microsphere sintering, and attrition may also be involved. SEM of FCC fracture surfaces, AEM of Y zeolite, and electron microscopy of this work are developed to better understand and minimize catalyst deactivation.

Elemental Distribution in Pt-Re:Al2O3 Naphtha Reforming Catalysts

1980 ◽  
Vol 38 ◽  
pp. 200-201
Author(s):  
R. L. Freed ◽  
M. J. Kelley
Keyword(s):  
Bimetallic Catalyst ◽  
Supported Catalysts ◽  
Coke Formation ◽  
Materials Characterization ◽  
Metal Catalyst ◽  
Elemental Distribution ◽  
Exact Nature ◽  
Naphtha Reforming ◽  
Reforming Catalysts ◽  
Commercial Introduction

The commercial introduction of Pt-Re supported catalysts to replace Pt alone on Al2O3 has brought improvements to naphtha reforming. The bimetallic catalyst can be operated continuously under conditions which lead to deactivation of the single metal catalyst by coke formation. Much disagreement still exists as to the exact nature of the bimetallic catalyst at a microscopic level and how it functions in the process so successfully. The overall purpose of this study was to develop the materials characterization tools necessary to study supported catalysts. Specifically with the Pt-Re:Al2O3 catalyst, we sought to elucidate the elemental distribution on the catalyst.

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