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Topic: Heterogeneous catalysis

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	Catalysis - Wikipedia, the free encyclopedia
		In chemistry and biology, catalysis is the acceleration of the reaction rate of a chemical reaction by means of a substance, called a catalyst, that is itself not consumed by the overall reaction.
		Catalysis is at the heart of the Bombardier beetle defence mechanism.
		Catalysis is important in many aspects of environmental science from the catalytic converter in automobiles to the causes of the ozone hole.
	en.wikipedia.org /wiki/Catalysis (518 words)

	NACS - Journals, Publishers and Articles (Site not responding. Last check: 2007-10-13)
		Catalysis Letters is devoted to the development of the science of catalysis and functions as a vehicle of communication and exchange of seminal ideas and advances among practitioners operating in a wide range of sub-disciplines including heterogeneous, homogeneous and enzymatic catalysis.
		The general objective of the Journal of Molecular Catalysis A:Chemical is to publish scientific contributions examining the molecular and atomic aspects of catalytic activation and reaction mechanisms in: Organometallic and biomimetic catalysis, Ionic catalysis by acids, bases, and metal ions, Heterogeneous catalysis.
		Reaction Kinetics and Catalysis Letters is a medium for the rapid publication of original contributions in the following fields: kinetics of homogeneous reactions in gas, liquid and solid phase; homogeneous catalysis; heterogeneous catalysis; adsorption in heterogeneous catalysis; transport processes related to reaction kinetics and catalysis; preparation and study of catalysts; reactors and apparatus.
	www.nacatsoc.org /pubs.asp?Type=J (1194 words)

	ScienceWeek
		Catalysis is of vital importance: In biological systems, enzymes are essential catalysts for various biosynthetic pathways; in the chemical and petroleum industries, key processes are based on catalysis; in environmental chemistry, catalysts are essential to breaking down pollutants such as automobile and industrial exhausts.
		Catalysis (a word suggested in 1835 by J.J. Berzelius [1779- 1848]) is a process whereby the rate of a particular chemical reaction is hastened, sometimes enormously so, by the presence of small quantities of a substance which does not itself seem to take part in the reaction.
		The catalysis activity of the gel is thus expected to be switched on and off as the substrate is reversibly bound and released during the cycle of gel swelling and shrinking.
	scienceweek.com /2003/sw030613.htm (6195 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		As a consequence of the investigation of the catalysis of chemical transformations, fundamental advances are being made in inorganic, organometallic and microporous material synthesis; surface and physical chemistry; organic chemistry and chemical technology.
		At the NSF, heterogeneous catalysis is funded within its Engineering Directorate and is heavily oriented towards reaction kinetics, while homogeneous catalysis is funded within the Math and Physical Sciences Directorate (Organometallic and Inorganic Chemistry program) and is oriented primarily towards organometallic and organic synthesis.
		The economic impact of catalysis is outstanding, as the chemical industry is responsible for a significant fraction of the GDP (approximately $900B in 2000) and is one of the few sectors that historically have had a positive balance of trade for the US ($20B in 2000).
	www.er.doe.gov /bes/brochures/BES_CRAs/FY03_budget/CRA15.doc (2020 words)

	Catalysis (Site not responding. Last check: 2007-10-13)
		Heterogeneous catalysis occurs when the catalyst is in a different state from the reactants.
		Catalysis depends on the transition state being altered by association with the catalyst so there is a lower activation energy.
		Heterogeneous catalysis occurs when the catalyst is in a different state from the reactants, with the catalyst usually being solid and the reactants often being gaseous.
	www.kobold.demon.co.uk /kinetics/catalyst.htm (965 words)

	Chemical Sciences: Heterogeneous Catalysis in Kinetics
		Catalysts which operate on reactions taking place on surfaces, heterogeneous catalysts, are of great importance in chemical industry and in living organisms.
		In heterogeneous catalysis, the reacting species are held on the surface of the catalyst by a physical attraction called adsorption while the reaction takes place.
		Adsorption may be relatively weak (physical adsorption) or may have a strength comparable to the strengths of chemical bonds (chemisorption).
	www.psigate.ac.uk /newsite/reference/plambeck/chem2/p02173.htm (142 words)

	Catalysis (Inorganic Chemistry) - Wikibooks, collection of open-content textbooks
		Catalysis is the ability of some species to rapidly speed up the rate at which a chemical reaction proceeds.
		Heterogeneous catalysts have a catalyst that is in a different phase.
		This type of catalysis is responsible for the vast majority of 'bulk' chemicals that are produced each year that go into making all the things we take for granted around us such as plastics, and are also extensively used for refining oil in gasoline.
	en.wikibooks.org /wiki/Catalysis_(Inorganic_Chemistry) (722 words)

	S David Jackson Research : HETEROGENEOUS CATALYSIS IN FINE CHEMICALS SYNTHESIS
		At present, although heterogeneous catalysis is used in the fine chemicals industry, only two systems are widely used; these are Raney nickel and palladium/carbon.
		Much of the reason for this lies in the history of catalysis where a great deal of the research effort was directed at large scale gas phase processes involving relatively simple molecules.
		One of the main aspects of this area of catalysis is the need to react one type of functional group in the presence of others.
	www.chem.gla.ac.uk /staff/sdj/research/hcfcs.htm (451 words)

	C&EN: COVER STORY - QUICK DISCOVERY
		However, this complexity makes heterogeneous catalysis a promising market for combinatorial chemistry companies because they have an opportunity to add real value for clients who are outsourcing catalysis RandD.
		In fact, Murphy says, because of the larger number of combinations usually possible in heterogeneous catalysis, combinatorial chemistry may be a necessity for catalyst discovery in bulk chemicals.
		Strehlau points to hte's work in automotive catalytic converters, a heterogeneous catalyst system in which a washcoat of a metal oxide is placed on a ceramic substrate.
	pubs.acs.org /cen/coverstory/8129/8129catalysis.html (2117 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Heterogeneous acid catalysis attracted much attention primarily because heterogeneous acidic catalysts act as catalysts in petroleum refinery and are known as a main catalyst in the cracking process which is the largest process among the industrial chemical processes.
		In contrast to these extensive studies of heterogeneous acidic catalysts, fewer efforts have been given to the study of heterogeneous basic catalysts.
		It is more useful and informative to describe the studies of heterogeneous basic catalysis performed for a long period.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=69974 (345 words)

	Chapter 14, Section 6 (Site not responding. Last check: 2007-10-13)
		A heterogeneous catalyst exists in a different phase from the reactant molecules, usually as a solid in contact with either gaseous reactants or with reactants in a liquid solution.
		Heterogeneous catalysts are often composed of metals or metal oxides.
		As an example of heterogeneous catalysis, consider the exothermic reaction of hydrogen gas with ethylene gas to form ethane gas:
	cwx.prenhall.com /bookbind/pubbooks/blb/chapter14/medialib/blb1406.html (1752 words)

	CHEMISTRY: ON HETEROGENEOUS CATALYSIS
		For example, because in heterogeneous catalysis efficiency, in general, increases with total surface area of the solid catalyst, finely divided particles are usually applied to a support material which is only relatively inert.
		At the present time, analysis of the fundamentals of heterogeneous catalysis is largely dependent on the use of surface science models, real but simple systems such as single crystal surfaces whose structure may be varied by choosing different surface orientations.
		Similar considerations apply to the surfaces of solid catalysts in general and of metal oxides in particular, because the surface atoms are characterized by a "ligand" sphere that differs from that in the bulk.
	scienceweek.com /2004/sc041217-5.htm (1179 words)

	Heterogeneous catalysis. (from catalysis) -- Encyclopædia Britannica
		Heterogeneous (multiphase) catalysis most commonly proceeds through chemisorption (adsorption by chemical bonding to the surface) of at least one of the reactants on the surface of the catalyst, the site of the catalyzed reaction being the adsorbed layer.
		Since heterogeneously catalyzed reactions occur on the surface of the catalyst, the rates of such reactions…
		The catalytic reaction may be acid-specific (acid catalysis), as in the case of decomposition of the sugar sucrose into glucose and fructose in sulfuric acid; or base-specific (base catalysis), as in the addition of hydrogen cyanide to...
	www.britannica.com /eb/article-1169 (756 words)

	KATZ Chemical Engineering
		Yet as the major challenges facing catalysis in this century shift towards unprecedented levels of high catalyst selectivity, including enantioselectivity, we and others within the community are investigating new methods for synthesizing heterogeneous catalysts to meet this challenge.
		The resulting heterogeneous catalyst consists of an isolated atom of titanium within a ligand sphere defined from the top by a calixarene and from the bottom by the silica surface.
		Finally, cyclohexene epoxidation catalysis, which was used as a model reaction, showed a rate of catalysis to be independent of Ti-coverage on the catalyst.
	www.cchem.berkeley.edu /katzgrp/research.htm (2237 words)

	OUP: Basis and Applications of Heterogeneous Catalysis: Bowker
		Catalysis is one of the most important technologies in our modern world.
		It is therefore very important that we ask ourselves the question, 'what is catalysis?' and this book does exactly that, concentrating on the most important type of catalysis for industry, namely heterogeneous catalysis.
		The book is split into 3 sections, dealing with the fundamentals of adsorption and reaction at surfaces, the nature of heterogeneous catalysts and their synthesis, and the applications of this technology in the modern world.
	www.oup.co.uk /isbn/0-19-855958-5 (340 words)

	Short articles on combustion: Heterogeneous catalysis in a CSTR
		Models for heterogeneous catalysis were comprehensively reviewed by Razon and Schmitz [1987].
		In fact most models in the mathematics literature treat heterogeneous catalysed reactions as a single-step exothermic reaction, ignoring the adsorption and desorption processes.
		Isothermal heterogeneously catalysed reactions in a CSTR, assuming Langmuir-Hinshelwood kinetics, were comprehensively treated by Chang and Aluko [1984] and Aluko and Chang [1984] who showed that even simple Langmuir-Hinshelwood mechanisms for bi-molecular reactions can have oscillatory behaviour.
	www.uow.edu.au /~/mnelson/review.dir/cstr-cat.html (714 words)

	Catalyst (Site not responding. Last check: 2007-10-13)
		A heterogeneous catalyst exists in a different phase from the reactant molecules - often as a solid in contact with either a gaseous or liquid reactants
		Thus, in manufacturing heterogeneous catalysts techniques are used to maximize the surface area (e.g.
		The initial step in heterogeneous catalysis is the adsorption of reactants onto the surface of a catalyst
	wine1.sb.fsu.edu /chm1046/notes/Kinetics/Catalyst/Catalyst.htm (1182 words)

	Expert in: Reaction Kinetics, Homogeneous and Heterogeneous Catalysis, Adsorbents
		The catalyst synthesis technology developed by Expert and his associates is directly applied to the catalysis of petroleum and chemical reactions.
		Therefore, the insight that he has in the catalyst technology allows him to solve many problems relating to the catalysis of petroleum and chemical reactions.
		The catalyst synthesis technology that Expert and his associates have developed is directly applied to the catalysis of pollutants.
	www.intota.com /viewbio.asp?bioID=617003&perID=721060 (438 words)

	Alibris: Catalysis
		The features of this book which will be of special interest to academic organic chemists are the introduction (Chapter 1), which presents a short course on the concepts and language of heterogeneous catalysis, covers organic reaction mechanisms of hydrogenation (Chapter 2), hydrogenolysis (Chapter 4), and oxidation (Chapter 6), a presents problems...
		Heterogeneous catalytic oxidation is a key technique used in the large-scale production of organic chemicals.
		Examines the role of catalysis in applied polymer developments, focusing on metal catalysis of olefins, epoxides, oxetanes, cyclic phosphazenes, and cyclic silanes.
	www.alibris.com /search/books/subject/Catalysis (1144 words)

	Symyx \| Screening (Site not responding. Last check: 2007-10-13)
		Independent of how the libraries of catalysts are prepared, the catalysts are screened (or tested against a set of criteria) for a property, such as a performance or a physical or chemical property.
		The most common screen for heterogeneous catalysts is running the library in the reaction of interest (e.g.
		Heterogeneous catalysis screening relies on some fundamental principles, such as achieving equal flow through the channels of a parallel reactor or being able to scale up the results from one reaction size to another.
	www.symyx.com /page.php?p=000106&page=212&pid=58.93.96.153 (205 words)

	Expert in: Organic Chemistry, Heterogeneous Catalysis, Coal, Stereochemistry
		Expert was on the editorial board for the Journal of Catalysis from 1976-1983.
		Expert has been involved in a long-time research collaboration in heterogeneous catalysis in organic chemistry at József Attila University in Szeged.
		Expert participated in workshops (1992 and 1994) teaching heterogeneous catalysis in organic chemistry (1996, Feb-July).
	www.intota.com /viewbio.asp?bioID=603696&perID=108359 (575 words)

	Wiley::Principles and Practice of Heterogeneous Catalysis
		This book is perfectly suitable as required reading in graduate heterogeneous catalysis courses, given the many interesting "standard" and "thought" problems included at the end of each chapter.´
		I agree with recommendation without limits and I would like to recommend the book particularly as text accompanying lectures about heterogeneous catalysis, whether within the framework of the education in technical chemistry, physical chemistry, inorganic chemistry or chemical engineering.
		I am sure that "Principles and Practice of Heterogeneous Catalysis" also will develop to be a classic text in the literature on catalysis which should not be missing on a bookshelf.'
	wiley.com /WileyCDA/WileyTitle/productCd-352729239X,descCd-reviews.html (381 words)

	Heterogeneous catalysis in low-pressure plasmas
		Heterogeneous catalysis in the low-pressure (5 mbar) plasma phase is shown to result from mass and energy exchanges between the plasma and the solid surface.
		Perturbation of the plasma medium by the solid is interpreted as a catalytic action to the extent that it leads to an increase of chemical reactivity of the system.
		These theories applied to surface reaction dynamics (Wolken) added to the results concerning gas/solid energy transfer during catalytic atoms recombination (Halpern and Rosner) have established that the desorbed molecules leave the surface with a substantial vibrational energy which depends on the recombination-desorption mechanisms.
	stacks.iop.org /0022-3727/19/2013 (377 words)

	CBE 535: Heterogeneous Catalysis: Principles and Applications
		This course explores topics in the design of heterogeneous catalysts for environmentally benign chemical processes.
		Additionally, the class meets weekly to work as a team on applying these concepts to designing new catalysts for such processes as selective dehydrogenation of hydrocarbons, selective catalytic reduction of nitric oxide, and selective reduction of fluoro-carbons.
		Students will also do experimental work in the catalysis labs to test the catalyst designs that they have developed during the semester.
	www.engr.wisc.edu /che/courses/che535.html (186 words)

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