Talk:Water–gas shift reaction

Organic?
Is this an organic reaction or an inorganic reaction? The text says one thing--the category suggests another.

-I would say inorganic. - Brendio 13:08, 29 August 2006 (UTC)

Discovery?
There is no source that lists Felice as the discoverer of the reaction. I have a review paper by Ratnasamy et al. from Catalysis Reviews vol. 51 2009 that states the first official report of the WGS reaction was in 1888 by Mond, L. and Langer, C. in the form of a British Patent. —Preceding unsigned comment added by 128.211.172.137 (talk) 17:15, 30 March 2010 (UTC)


 * Perhaps some information could be retrieved from footnote 14 in Wikipedia article about Felice Fontana. Ekisbares (talk) 17:33, 31 March 2023 (UTC)

Dussan Reaction???
Hi, I have never heard the WGS reaction referred to as the Dussan reaction. If you do a scholarly search on google, science direct, A.C.S. or other reputable sites nothing comes up. Can some one inform me where this term came from, preferably with a reference? Thanks in advance.--El Mayimbe (talk) 03:54, 13 October 2010 (UTC)

Article title
I think much the most common spelling is "water gas", not hyphenated or a dash. It is a gas made from water, like coal gas is a gas made from coal. If the words are linked at all is would be a hyphen rather than a dash. The article has recently had its name changed to include a dash which I think is wrong. Thincat (talk) 21:28, 7 September 2011 (UTC) I have changed the name and edited the article. Thincat (talk) 21:39, 7 September 2011 (UTC)


 * Interesting; thanks. So what's the shift between? The reaction causes what to shift to/from what? Tony   (talk)  01:55, 8 September 2011 (UTC)
 * I replied to Tony. Whether the phrase "water gas shift reaction" ought strictly have a hyphen or dash depends on whether water gas is being used as a (hyphenated) noun phrase or whether there is a shift reaction involving a mixture of water and gas (dash). I may yet find out or I may give up. Maybe there is no clear answer. In any case the most common form seems to be "water gas shift reaction" and since this also neatly sidesteps such esoteric matters of historical chemistry (and edit wars!) I prefer the spaced out form. Thincat (talk) 14:03, 8 September 2011 (UTC)
 * The reaction causes oxygen to shift from water to the gas, thereby producing hydrogen. The gas needs to be something that can use additional oxygen, e.g. carbon monoxide. I have no opinion on the hyphen. Vaughan Pratt (talk) 04:16, 6 June 2023 (UTC)


 * Definitely hyphen would be the most correct and illuminating punctuation. Some books do it it that way, including 6 of first 10 google books hits, though as with many phrases familiar in their field, the hyphen does also often get dropped. Dicklyon (talk) 14:55, 8 September 2011 (UTC)


 * I'll go ahead and add the hyphen, since it's about a shift reaction that makes or unmakes water gas, not about a shift between water and gas. Dicklyon (talk) 22:39, 28 June 2013 (UTC)

Peer review and responses during the educational assignment in Fall 2013
Intro

•	line 1: “describeds”

•	equation: maybe describe where these numbers and the equation come from

History

•	“The reaction is reversible, slightly exothermic, becoming less so with increasing temperature.” Becoming less reversible or less exothermic with increasing temperature?

•	“Research in this area continues to be active field in the present day” grammar issues

•	Broken link to “Hydrogen world”

•	Paragraph 3, line 1: “…and is becoming an important in both the political…”

•	Paragraph 3, last line: used “WGS” instead of “WGSR”

Applications

•	Industrial, first line, missing a leading noun. “? Is used in…”

•	Line 1: random ellipses?

•	Line 1-2: “It is often used in conjunction with steam reforming of methane or other hydrocarbons,[1]” Need a period at the end of sentence, not comma. Also, reword this sentence so it is clearer what “steam reforming of methane etc.” means.

•	Line 2: what is the Fischer Tropsch Process?

•	Line 3-4: “The water-gas shift reaction may be an undesired side reaction in processes involving water and carbon monoxide, e.g. the rhodium-based Monsanto process. The iridium-based Cativa process uses less water, which suppresses this reaction.” This is a repeat of a sentence included in the History section already

•	Line 5: ”…equilibrium of this reaction is shows a significant…” grammar

•	What are the Monsanto and Cativa processes?

•	“…are thermodynamically limited exit composition of 2-4% carbon monoxide.” What?

•	“…is employed produce…” (employed TO produce)

•	Paragraph 2, line 6, “prioir” = prior*

•	Edit superscripts and subscripts (H2O, oC, etc) throughout\

-Above edits suggested by GoBlue18 -

Review from physorg_2013

Content: The introductory section is generally appropriate for non-chemistry experts but the terms “thermodynamically favored” and “kinetically favored” might be unfamiliar to no-experts. They could either be parenthetically defined or linked to another Wikipedia page that explains what these terms mean. None of the sections are unnecessarily long and each is broken into appropriate subsections. As a single reaction, the topic doesn’t lend itself to discussing examples as much as applications and mechanism, but the page discusses good examples and appropriately considers the different mechanisms that have been proposed. The key terms and content are linked to other appropriate Wikipedia pages. One link (hydrogen world) is to a page that does not exist so the link should be either removed or another page to link to should be chosen (Wikipedia has a page on “world hydrogen energy conference,” which is the closest topic that arises from a single Google search). The last section also contains the sentence “Coupling the RWGS with the water electrolysis process, is will yield methane and oxygen,” which should probably read “coupling the RWGS with the water electrolysis process will yield methane and oxygen” unless there was an unfinished thought in it.

Figures: The figures illustrate important concepts for the page but are very small and would be a lot more useful if they were large enough to see the text on them. The figure illustrating the two different mechanisms looks like it is very helpful in distinguishing the two mechanisms but again it needs to be bigger.

References: There are more than eight references and the list does include non-journal sources, but one of the references is incorrectly cited (Wikipedia is showing an error message instead of citation 2). The section on fuel cells has “(Ladebeck)” written at the end of sentences as if it is a reference but this name does not appear in the reference list. The High Temperature Shift Catalysts does the same thing with “(Newsome 1980).” These two sources need full citations in the reference section.

Presentation: Overall the page looks very good. My first suggestion for the presentation would be to make the three figures larger. Chemical formulas should also be fixed to use subscripts and the degree sign should be superscript. — Preceding unsigned comment added by Physorg 2013 (talk • contribs) 15:04, 4 November 2013 (UTC)

Suggestions from ChemLibrarian (talk) 18:47, 4 November 2013 (UTC)

 * 1) About format -- You do not need to title the first paragraph as Introduction. Just delete the heading "Introduction". People usually know the first paragraph is an overview of the concept.
 * 2) Did you extracted data to plot the figure "Temperature Dependence of Keq"? Please be clear to mention the figure in your text and be explicit about where the data come from. Although data itself is not copyrightable and you can re-plot the extracted data, it is ethical to give credits. And it's easier for people who'd like to read the original work.
 * 3) Please fix the broken citations. Somehow you first citations went to the very beginning before everything else. And the second reference was never defined. Also, under the History section, there are a couple [1][2] seem not really inserted.
 * 4) There are three broken internal links in the Application/Industry section first line. e.g. Should use ammonia.

Suggestions from UMChemProfessor (talk) 19:33, 4 November 2013 (UTC)
Overall, the peer reviews are excellent and should be used to improve your site.

In addition:


 * 1) The "introduction" section is too technical for a high school audience. Major revisions are required.
 * 2) Use Keq instead of Kequil
 * 3) The figures are too small to be readable.
 * 4) Fix the reference error.
 * 5) Subscripts should be used for things like H2O.

Response to Peer Review Ajc540 (talk)Zwickipedia (talk) 23:36, 7 November 2013 (UTC)
Thanks you all for your reviews. In general, every grammatical and formatting error listed in the peer review has been fixed. Additional internal links were added for topics that may require further detail (ex. Mosanto process, etc...) Subscripts and superscripts have been fixed. The citations, references and internal Wikipedia links have all been redone and should all be appropriately linked now. The Keq equation was redone into the form the the one we used to plot the curve and the figure is now referenced in the text. We have adjusted the sizing of the figures to, what we think, is a more legible size. The introduction has been adjusted to be less technical and suitable for a more general audience. Originally we had the introduction and the 'History section together as one introduction, but chose to separate them for the sake of keeping the reaction formula separate from some of the general talking points. We have now moved the more technical details, namely the kinetics/thermodynamics, to a later section and recombined the history with the introduction to give a more simplified overview.

Outside comment
I have this page on my watchlist so I have just seen the recent changes to the article. What an outstanding improvement. I can't make out who has done what, but anyway it has has worked out well and has been very successful. In the past there have sometimes been rather unhappy examples of Wikipedia editing being used for educational purposes. In this case it looks to me the article has become both informed and accessible. Thincat (talk) 15:50, 11 November 2013 (UTC)

"pioneering period of the WGSR"?
"The pioneering period of the WGSR occurred between 1977 and 1984 after the discovery of metal carbonyls to catalyze the WGSR…" Lot of papers were published, but zero technology came from this "pioneering period". Thus, maybe it was not so pioneering? --Smokefoot (talk) 01:19, 15 November 2013 (UTC)

Italic text== Appropriate introductory material should be added ==

The WGSR is presented initially in overly-brief form. A new section is needed in the beginning to discuss the thermochemistry of the WGSR before proceeding to the current emphasis on using the WGSR for various industrial purposes. The WGSR is a subset of the C-O-H system. This system, at the equilibrium position, consists of six species that are present, or may be, in enough quantity to alter the (falsely) calculated equilibrium position when only CO, CO2, H2, and H2O are considered. In addition to the four WGSR species, there also exists CH4 and possibly elemental carbon (as graphite). The species C2H6 and all other hydrocarbons are present at the equilibrium position in trace amounts and may be neglected in a thermodynamic analysis unless one seeks the highest possible accuracy. Interestingly, the reverse WGSR is cited as a way to prepare CH4. To illustrate the important amount of CH4 that can form at the equilibrium position, as a reaction product, if one mole of CO is mixed with 2.5 moles of H2O, heated to 100°C, and introduced to an equilibrium reactor under adiabatic conditions, the reactants will reach an adiabatic reaction temperature of 504°C. At that point, the equilibrium reactant gas will have about 0.075 moles of CH4 and 0.064 moles of CO. This shows that CH4 can be present at a higher concentration that CO. Thus omitting CH4 as a possible constituent of WGSR reaction processes is not justified. In addition, if the abovementioned mixture has sufficient heat removed, the temperature will drop to a point where the calculated activity of C(gr) is greater than one. Obviously it takes a suitable catalyst for the reactants in a WGSR reactor to closely approach the equilibrium position, while there probably exist catalysts intended for some undesirable reaction products not to form their equilibrium amount. However, for a strictly thermochemical standpoint, it seems to me that the article would benefit from an introductory paragraph pointing out that the WGSR is just one of the three independent chemical reactions that define certain regions of the C-H-O system between about 200° - 600 °C, where CH4 and C are stable in significant amounts at the equilibrium position. In addition to the WGSR itself, the following two independent chemical reactions must be considered in calculating the equilibrium position in this range: 1. 3H2 + CO → CH4 + H2O; and  2. 2CO → CO2 + C(gr). Calculating the equilibrium position of gaseous C/H/O reactants from the value of Keq of the WGSR alone can give erroneous results for system temperatures below about 800°C, where CH4 may be present in stoichiometrically significant amounts, and C may tend to form. Pointing this out to Wikipedia readers can help those who may be doing such type of calculations. I am prepared to provide a number of sample calculations with citations in support of the above discussion, and to prepare a suitable introductory section if these remarks receive a favorable response. Thermbal (talk) 22:17, 17 April 2015 (UTC)
 * Your gesture is generous. I recommend that you do 10% of what you are thinking of.  Incremental contributions are always best.  We aim for general information and we aim for readability.  Many details and even some rigor can be sacrificed or ignored.  Wikipedia has zero interest in competing with technical articles (WP:NOTJOURNAL) and it is against our goals to compete with textbooks (WP:NOTTEXTBOOK).  So if you can constrain yourself, a short section on the thermodynamics of the H2O/CO vs H2/CO2 equilibrium would be welcome.  Probably the greatest challenge is if you can constrain yourself.  Short sections on thermodynamics would also be welcome on Steam reforming, methanation, and Boudouard reaction.  What readers seek is the general insights into the effect of operating conditions on these fundamental equilibria.  The references should be to textbooks or tables  from say NIST.  Good luck,--Smokefoot (talk) 23:28, 17 April 2015 (UTC)

Assessment comment
Substituted at 10:18, 30 April 2016 (UTC)