This website uses cookies to ensure you have the best experience. Learn more

Mesoporous Zeolites In Methane Aromatization Class Mesoporous Zeolites

1579 words - 7 pages

Tremendous progress in methane dearomatization reaction has been made since the past decade. Till now, Mo modified HZSM-5 and MCM-22 have been considered as the most suitable catalysts for this reaction. Recently, it was reported that IM-5 is an excellent support for this reaction[endnoteRef:1],[endnoteRef:2]. As far as these catalysts are concerned, their catalytic activity seems to decrease because of extensive coke formation. To facilitate improved selectivity to aromatics and simultaneously suppress the carbonaceous deposits, is a problem that is still faced by many researchers who are interested in MDA. [1: Liu, H., Wu, S., Guo, Y., Shang, F., Yu, X., Ma, Y., Xu, C., Guan, J. and Kan, Q. (2011). Synthesis of Mo/IM-5 catalyst and its catalytic behavior in methane non-oxidative aromatization. Fuel, 90(4), pp.1515-1521.] [2: Liu, H., Hu, J., Li, Z., Wu, S., Liu, L., Guan, J. and Kan, Q. (2013). Synthesis of Zeolite IM-5 under Rotating and Static Conditions and the Catalytic Performance of Mo/H-IM-5 Catalyst in Methane Non-Oxidative Aromatization. Кинетика и катализ, 54(4), pp.466-473.]
Performance of a catalyst depends on many factors: the zeolite pore structure, catalyst composition, distribution and number of acid sites, and other physiochemical properties[endnoteRef:3],[endnoteRef:4],[endnoteRef:5]. Nevertheless, various strategies have been implemented to enhance the catalytic performance. Examples include addition of proper promoters, changing reactor designs, addition of co reactants, and acidity adjustments[endnoteRef:6]. Preparing zeolite catalysts with hierarchical pores can reduce the diffusion limitations, thereby, facilitating the aromatic molecules to gain access into the pores during the reaction. There has been a growing interest in the field of hierarchical zeolites and it has found applications in other reactions like isomerization, catalytic cracking, and methanol to hydrocarbons. Various ways to synthesize hierarchical zeolites have been invented and they are mainly classified into two groups: “top-down” approach and “bottom-down” approach. In the “bottom-up” approach, the secondary pores are introduced during the synthesis of zeolite while “top-down” approach involves secondary pores being introduced post zeolite synthesis. Examples for “bottom-up” approach include “hard templating” methods, “soft-templating” methods[endnoteRef:7], and desilication, dealumination, irradiation, recrystallization[endnoteRef:8] for “top-down” approach. Some of the most common techniques employed to synthesize hierarchical zeolites are, desilication, dealumination and template assisted synthesis which are explained below: [3: Bibby, D. (1986). Coke formation in zeolite ZSM-5. Journal of Catalysis, 97(2), pp.493-502.] [4: Guisnet, M. and Magnoux, P. (1989). Coking and deactivation of zeolites. Applied Catalysis, 54(1), pp.1-27.] [5: Guisnet, M. and Magnoux P. (2010). ChemInform Abstract: Fundamental Description of Deactivation and...

Other Essays On Mesoporous Zeolites in methane aromatization - Class - Mesoporous zeolites

Character In "The Yellow Wallpaper" By Charlotte Perkins Gilman

1587 words - 7 pages The short story 'The Yellow Wall-Paper' written by Charlotte Perkins Gilman is a cry for freedom. This story is about a woman who fights for her right to express what she feels, and fights for her right to do what she wants to do. The narrator in this short story is a woman whose husband loves her very much, but oppresses her to the point where she cannot take it anymore. This story revolves around the main character, her oppressed life, and her

Edgar Allen Poe's View Of Death In "The Fall Of The House Of Usher"

1836 words - 8 pages Edgar Allen Poe's Symbolism of Death in 'The Fall of the House of Usher'Death is defined as, 'The termination or extinction of something' (American Heritage Dictionary). Edgar Allen Poe uses this description in 'The Fall of the House of Usher' in different ways. Poe's intention when writing 'The Fall of the House of Usher' was not to present a moral, lesson, or truth to the reader; he was simply trying to bring forth a sense of terror to the

"Slaughterhouse Five" By Vonnegut

2264 words - 10 pages When one begins to analyze a military novel it is important to first look at the historical context in which the book was written. On the nights of February 13-14 in 1944 the city of Dresden, Germany was subjected to one of the worst air attacks in the history of man. By the end of the bombing 135,000 to 250,000 people had been killed by the combined forces of the United States and the United Kingdom. Dresden was different then Berlin or many of

Psychoanalysis And Freud

2420 words - 10 pages Psychoanalysis is a system of psychology originated by the Viennese physician Sigmund FREUD in the 1890's and then further developed by himself, his students, and other followers. It consists of three kinds of related activities: (1) a method for research into the human mind, especially inner experiences such as thoughts, feelings, emotions, fantasies, and dreams; (2) a systematic accumulation of a body of knowledge about the mind; and (3) a

Comparative Essay. "Heart Of Darkness" By Joseph Conrad And William Golding's "Lord Of The Flies"

2729 words - 11 pages It can be said that a certain degree of darkness lies within every person, but this darkness will not surface unless given the correct environment. The darkness, however, can emerge and ultimately destroy the person if not checked by reason. If one's inner darkness does surface, the victim then is given the opportunity to reach a point in personal growth, and to gain a sense of self-knowledge from it. That is, when one's darkness appears, one

This Is An Essay On The Woman In The Odyssey And Their Influences On His Travels

993 words - 4 pages The Odyssey is an epic about a Greek warrior in the Trojan War whose wanderings around his known world and his perilous encounters are the basis of the story. Odysseus' absence from his home is prolonged by the influences of the women whom he encounters.In this epic, several female characters had a profound effect on the plot. They wielded their influence through typically feminine skills and attributes: seduction, supernatural powers

Title:Aggressive and Passive. Compare characters in the Handmaid's Tail between Hamlet. Offred is aggressive while Ophelia is passive

537 words - 3 pages Aggressive and PassiveAggressive and Passive are two inverse attitudes to things, events or life. They cause different results. Offred and Ophelia are two women who have contrary destinies because of their different attitudes.Offred is a powerless woman in "the Handmaid's Tale". She's a handmaid of a commander in Gilead. She has no freedom. She belongs to him as a property. Her only duty is to have sex with the commander and give birth to a baby

Black Boy vs Grapes of Wrath

444 words - 2 pages Even though the books of Black Boy and Grapes of Wrath gave a vivid picture of the past American life to the readers regarding the socio-economic bigotry. Both books are similar in focusing the social and economic discrimination in the family setting. On Grapes of Wrath the California prejudice against the immigrants. Prejudice was a strong word, which leaves a bitter taste in the mouth. It is the prejudice against the migrant workers by the

Leprosy ; includes what bacteria it is caused by, the orgin of the disease, how many people are affected by it in the united states and in alaska during 1999 and 2000, and more. 3 pages long

524 words - 3 pages form is very severe, producing large disfiguring nodules. Tuberculoid os known to cause tuberculosis and lepromatous is known to cause leprosy.The main challenges for Hansen's Disease is elimination efforts are to reach populations that have not yet received multi-drug therapy services, improve detection of the disease, and provide patients with good quality health care, and free medications.Hansen's Disease in the Western Pacific is a

Reality Vs. Appearance - Hamlet

978 words - 4 pages In the play "Hamlet," Shakespeare's characters are confronted with the timeless question: How can one determine what is actually true from what only seems to be true? Throughout the play, the theme of appearance versus reality is constant. This theme is played out from the beginning, with Claudius' attempt to conceal his secret intentions; Gertrude and Ophelia masking their own truths, and finally Hamlet, who assumes the role of a madman in

My favorite place

320 words - 2 pages Among the places where I have traveled, I especially like Fort Lauderdale very much. It fills me with beautiful memories. It reminds me of the days when I lived in Vietnam where I was born, especially the coconut trees, the hot and humid weather are like Vietnam. Fort Lauderdale has almost all the tropical fruits like jack fruit, durian, and longan. All these fruits are not grown in California.I usually come to Fort Lauderdale for a vacation. I

Similar Papers

Climate Change & It's Impact On Earth Harristown State High School 10 B Essay

582 words - 3 pages Essay created by Jahseh Onfroy Harristown State High School Class 10B Introduction What is climate change? Climate change is the average temperature of Earth has increases since 1950 until now the temperature continuing increasing. Climate change can also refers to climate change that causes an increase in the average of temperature. However climate change are causes by natural events and human that are believed to be contribute to increase

The Global Warming Or Climate Change Bcaa Assignment

1135 words - 5 pages Diploma in Architecture (Technology)   Course: DAR180 Green Building & Universal Design   Reporting on the documentary film "Before the Flood”  April 30, 2018(Monday)  Assignment 1: "Reflections"   Name: Khine Hay Thi   NRIC: S9374108J   Class: 152ARA1   What does climate change or global warming to you?  Our earth’s climate has been stable for a very long time ago. We know it’s out  there, not in the distant future, not at the end of the

Avoidance, Resistance, And Tolerance As Immune Defense Strategies University Of Wisconsin Madison Medicine 699 Research Paper Review

1861 words - 8 pages possible risk, the host will then alter its behavior to avoid any potential damage and reduce the risk for infection by the pathogen. The vomeronasal region of the human body is an example of how the avoidance strategy functions. In most mammals, the vomeronasal organ contains a series of formyl-peptide receptors/olfactory receptors in order to detect and inhibit any bacterial pathogens from advancing (5). Another class of receptors also found in the

Late Stage Capitalism And Environmental Destruction: The Rise Of Collective Responsibility Ba Fine Art, Ual Essay

2481 words - 10 pages division of labour, which in turn gave rise to the subsistence of unconnected social classes based on economic variances. Believing that the existence of the proletariat alone, would render the State unneeded, Marx argued the state to be an instrument of social control used by the members of one class to suppress the members of another. "In place of the old bourgeois society, with its classes and class antagonisms, we shall have an association in