Elucidating the nature of Mo species on ZSM-5 and its role in the methane aromatization reaction

2021 ◽  
Author(s):  
Alfonso Caballero ◽  
Gerardo Colón ◽  
Francisco Platero ◽  
Angeles Lopez-Martin
Keyword(s):  
Transition Period ◽  
Methane Aromatization ◽  
Aromatization Reaction

The valorization of methane is one of the most important goals during the transition period to the general use of renewables energies. Its transformation in a valuable chemical like benzene...

Effect of addition of a second metal in Mo/ZSM-5 catalyst for methane aromatization reaction under elevated pressures

2015 ◽  
Vol 256 ◽  
pp. 269-275 ◽  
Author(s):  
Vlastimil Fila ◽  
Milan Bernauer ◽  
Bohumil Bernauer ◽  
Zdenek Sobalik
Keyword(s):  
Methane Aromatization ◽  
Elevated Pressures ◽  
Aromatization Reaction

Remarkable Improvement on the Methane Aromatization Reaction:  A Highly Selective and Coking-Resistant Catalyst

2002 ◽  
Vol 106 (34) ◽  
pp. 8524-8530 ◽  
Author(s):  
Ding Ma ◽  
Yuan Lu ◽  
Lingling Su ◽  
Zhusheng Xu ◽  
Zhijian Tian ◽  
...  
Keyword(s):  
Methane Aromatization ◽  
Remarkable Improvement ◽  
Aromatization Reaction

scholarly journals Coupling Oil Increase by Coal Liquefaction Residue Pyrolysis and Coal Pyrolysis Depolymerization Based on Big Data

2022 ◽  
Vol 2152 (1) ◽  
pp. 012009
Author(s):  
Bo Tian ◽  
Hao Zhang ◽  
Jie Liu ◽  
Yibin Liu ◽  
Chaohe Yang
Keyword(s):  
Big Data ◽  
Industrial Development ◽  
Coal Liquefaction ◽  
Polymerization Reaction ◽  
Pure Hydrogen ◽  
Condensation Polymerization ◽  
Coal Pyrolysis ◽  
Methane Aromatization ◽  
Aromatization Reaction ◽  
Big Data Technology

Abstract With the continuous improvement of big data technology, my country’s coal liquefaction technology has also continued to mature, maintaining a stable industrial development. Traditional coal pyrolysis technology for tar production with the purpose of increasing tar production, such as coal hydropyrolysis, has problems such as high cost of pure hydrogen atmosphere and complex process and equipment operations, which severely restrict its industrial operation process. Based on this, this paper proposes a new technology of coal pyrolysis and depolymerization coupled with oil increase by using hydrogen precipitated by the condensation polymerization reaction at relatively high temperature under big data technology to study the effect of this process on coal pyrolysis for oil production. Experiments show that at 700°C, the tar yield reaches 21.5wt.%, which is 6% and 7% higher than the pyrolysis tar yield under the same conditions under hydrogen and nitrogen atmospheres. At 600°C, the methane aromatization reaction is relatively weak, and it can be seen that the tar yield is only slightly higher than that under hydrogen and nitrogen atmospheres. As the temperature of the methane anaerobic aromatization reaction increases, the equilibrium conversion rate increases accordingly. Therefore, as the reaction temperature increases, the tar yield also begins to increase.

New Data on the Ability of Alumina–Platinum Systems to Catalyze the Methane Aromatization Reaction under Nonoxidizing Conditions

2018 ◽  
Vol 59 (3) ◽  
pp. 378-385 ◽  
Author(s):  
N. V. Vinichenko ◽  
D. V. Golinskii ◽  
E. V. Zatolokina ◽  
E. A. Paukshtis ◽  
T. I. Gulyaeva ◽  
...  
Keyword(s):  
Methane Aromatization ◽  
Aromatization Reaction

Overgrowth of lamellar silicalite-1 on MFI and BEA zeolites and its consequences on non-oxidative methane aromatization reaction

2018 ◽  
Vol 263 ◽  
pp. 1-10 ◽  
Author(s):  
Yiqing Wu ◽  
Laleh Emdadi ◽  
Emily Schulman ◽  
Yuying Shu ◽  
Dat T. Tran ◽  
...  
Keyword(s):  
Methane Aromatization ◽  
Aromatization Reaction

Preparation of Mo/HZSM-5/Bentonite Catalyst for Methane Aromatization in a Fluidized Bed Reactor

2017 ◽  
Vol 15 (5) ◽  
Author(s):  
J Lasobras ◽  
J.A Medrano ◽  
J Soler ◽  
J Herguido ◽  
M Menéndez ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Mechanical Stability ◽  
Active Material ◽  
Fluidized Bed Reactor ◽  
Added Value ◽  
Fluidized Bed Reactors ◽  
Thermal Treatments ◽  
Methane Aromatization ◽  
Catalyst Synthesis ◽  
Aromatization Reaction

Abstract Methane aromatization is a promising technology for the transformation of natural gas to added-value products. The main objective of this work was to obtain a catalyst with suitable performance and good mechanical stability for methane aromatization reaction in fluidized bed reactors. The selected catalyst was Mo/H-ZSM-5/bentonite mixture. Mo/ZSM-5 was chosen as the active material, since it provides good selectivity to aromatics but the particle size of the zeolite was too small for operation in a fluidized bed and a binder was needed. We prepared two series of catalysts with two different zeolites. We tested several heating velocities (1, 7 and 10 °C min‒1) in the different stages of catalyst synthesis. Methane conversion and selectivity to aromatic products improved when using gentle thermal treatments, increasing 2% and 10%, respectively, for the best catalyst tested.

scholarly journals Enhancing Methane Aromatization Performance by Reducing the Particle Size of Molybdenum Oxide

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1991
Author(s):  
Jing Hu ◽  
Jinghai Liu ◽  
Jinglin Liu ◽  
Yangyang Li ◽  
Peihe Li ◽  
...  
Keyword(s):  
Molybdenum Oxide ◽  
Type Species ◽  
Active Sites ◽  
High Performance ◽  
Acid Sites ◽  
Reaction Conditions ◽  
Methane Aromatization ◽  
Synthetic Strategy ◽  
Aromatization Reaction ◽  
Molybdenum Oxide Nanoparticles

Efficient use of natural gas to produce aromatics is an attractive subject; the process requires catalysts that possess high-performance active sites to activate stable C–H bonds. Here, we report a facile synthetic strategy to modify HMCM-49 with small molybdenum oxide nanoparticles. Due to the higher sublimability of nano-MoO3 particles than commercial MoO3, they more easily enter into the channels of HMCM-49 and associate with Brønsted acid sites to form active MoCx-type species under calcination and reaction conditions. Compared with commercial MoO3 modified MCM-49, nano-MoO3 modified MCM-49 exhibits higher methane conversion (13.2%), higher aromatics yield (9.1%), and better stability for the methane aromatization reaction.

Treatment Considerations for Adolescents Who Exhibit Cognitive/Communication Problems: A Neuroscience Perspective

2020 ◽  
Vol 5 (6) ◽  
pp. 1767-1775
Author(s):  
Martha S. Burns
Keyword(s):  
Social Communication ◽  
Transition Period ◽  
Clinical Intervention ◽  
Review Article ◽  
Sensitive Period ◽  
Clinical Implications ◽  
Evidence Based ◽  
Communication Problems ◽  
Treatment Considerations ◽  
Behavioral Growth

Purpose Adolescence is a period of substantial neurophysiological and behavioral growth, representing a second sensitive period of brain development. It is a psychological and social transition period between childhood and adulthood with many beneficial changes occurring, especially with respect to potential responsiveness to clinical intervention. However, adolescent behavioral complexities introduce clinical challenges as well. The purpose of this review article is to review the current neuroimaging research on neurophysiological changes observed during adolescence and the cognitive and social behavioral counterparts, with specific attention to the clinical implications. The review article will then summarize currently available intervention tools that can be utilized by speech-language pathologists working with this population. It will conclude with available evidence-based social-communication approaches that may be applicable as well as available evidence-based supplemental technological cognitive interventions that may be useful in working with adolescents who exhibit language and communication issues. Conclusion As a transition period between childhood and adulthood, adolescence represents a second sensitive period during which there is opportunity for clinically derived beneficial cognitive and communication growth.

The Fundamentals of the Clinical Fellowship Experience

2016 ◽  
Vol 1 (11) ◽  
pp. 81-85
Author(s):  
Melanie Hudson
Keyword(s):  
Growth And Development ◽  
Transition Period ◽  
Clinical Skills ◽  
Practical Experience ◽  
Professional Experience ◽  
New Graduate ◽  
Independent Practitioner

The Clinical Fellowship Experience is described by the American Speech-Hearing-Language Association (ASHA) as the transition period from constant supervision to independent practitioner. It is typically the first paid professional experience for the new graduate, and may be in a setting with which the new clinician has little or even no significant practical experience. The mentor of a clinical fellow (CF) plays an important role in supporting the growth and development of this new professional in areas that extend beyond application of clinical skills and knowledge. This article discusses how the mentor may provide this support within a framework that facilitates the path to clinical independence.

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