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2
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1answer
64 views

Why it is not yet possible to produce ethanol selectively in the Fischer Tropsch reaction?

The Fischer Tropsch reaction between carbon monoxide and hydrogen has the potential to give a wide range of products. However by judicious choice of catalytic metal it is possible to produce methane, ...
4
votes
1answer
64 views

How does salt and water help corrosion?

I was always wondering why iron only rusts when it gets wet. I know that for example aluminium oxidises on its own on regular basis. I also heard many complains that salt used to remove snow from ...
8
votes
3answers
74 views

Is there a catalyst that will reduce an alcohol to an alkane?

There are many reduction methods of going from an alcohol to an alkane: http://www.transtutors.com/chemistry-homework-help/hydrocarbons/reduction-of-alcohols.aspx And there are catalytic methods of ...
2
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0answers
32 views

Photoelectrochemical (PEC) water splitting

I'm starting to prepare for my research project on photoelectrochemical (PEC) splitting of water into H and O using (F doped) titanium dioxide as the photoanode. I've been unsuccessfully searching in ...
2
votes
3answers
86 views

Which has higher rate of hydrogenation- methyl propene or trans-2-butene?

I know that cis-2-butene has a higher rate of hydrogenation than both of these due to steric reasons, but here both of these compounds have same steric hindrance. So, when they come in contact with ...
2
votes
2answers
107 views

Hydrogenation stereochemistry-Pd,Pt, Ni catalysts

When my textbook talks about hydrogenation using Pt, Pd or Ni heterogeneous catalysts, it never mentions if it is anti or syn addition. It simply jumps on to say that for alkynes, NiB2 (P-2) catalysts ...
6
votes
1answer
58 views

Catalytic iodine in synthesis of phosphonium salts

From Clayden et al. However, iodine is expensive and a way round that problem is to use a catalytic amount of iodide. The next phosphonium salt is formed slowly from benzyl bromide but the ...
4
votes
1answer
153 views

Difference between nickel catalyst and Raney nickel catalyst

Many times i have seen the catalyst as Raney nickel instead of nickel catalyst. I think Raney is a name of chemist who discovered Raney nickel catalyst.I think Raney nickel catalyst and nickel ...
0
votes
3answers
45 views

How can one come to know how a catalyst affects a reaction when the reaction and the catalyst is known

How can I come to know how a catalyst affects a reaction when the reaction and the catalyst used is known. I searched the internet for an answer but could not find one.
5
votes
2answers
407 views

How can water catalyse a reaction between iodine and aluminium?

A few drops of water can initiate a reaction between iodine and aluminium. https://www.youtube.com/watch?v=SKSU72-1ERc How can this happen, since iodine is only slightly soluble in water?
1
vote
1answer
55 views

Decreasing rate of reaction between $\ce{I2(s)}$ and $\ce{H2(g)}$?

Which change will decrease the rate of the reaction between $\ce{I2(s)}$ and $\ce{H2(g)}$? (A) Increasing the partial pressure of $\ce{H2(g)}$ (B) Adding the $\ce{I2(s)}$ as one piece ...
1
vote
1answer
47 views

How to speed up flash powder flaming reaction

Do you have an idea how can be flaming of flash powder (probably $\ce{KClO_4} $ (60%) + $\ce{Al}$ (40%) ) can be speeded up? Of course we consider the pure oxygen-in-air conditions. So how? With some ...
2
votes
1answer
100 views

Why platinum used as a catalyst in fuel cell electrodes (and elsewhere)?

I have rather basic knowledge of chemistry (at the level of a first year college class). But maybe somebody can still clarify with some simple words: What makes platinum a good catalyst for the ...
6
votes
1answer
58 views

Ozone catalysis

I know that catalysts don't change chemical equilibrium because they accelerate both the reactions in the same way. I can't understand why CFC catalysts accelerate ozone destruction but not ozone ...
4
votes
1answer
319 views

Reaction intermediates of MnO2 catalyzed H2O2 decomposition reaction

Manganese dioxide catalyzes the decomposition of hydrogen peroxide to water and oxygen gas. But what are the intermediates in this catalyzed reaction?
0
votes
0answers
32 views

Hill constant cooperativity

Is there an expression for calculating $K_d$ for a cooperative system (using the Hill constant)? I can't find one online and there was none given in my lectures, only a rearranged formula for the ...
2
votes
1answer
48 views

What is 'coprecipitated (Ni,Fe)S'?

I am writing an essay on the origin of life and I was reading an article on hydrothermal vents. (Peptides by Activation of Amino Acids with CO on (Ni,Fe)S Surfaces: Implications for the Origin of ...
0
votes
0answers
28 views

Langmuir Adsorption

So I recently ran into the topic of adsorption onto Langmuir surfaces. So let [S] be the concentration of sites without anything bound to them [A*] be the concentration of A and site pairings and [S]0 ...
4
votes
2answers
124 views

Analytical solution to first-order rate laws

Does anyone know the analytical solutions to the following rate laws: 1) $\frac{d\rho_W}{dt} = -\rho_W*(K_1+K_2+K_3)$ 2) $\frac{d\rho_T}{dt} = \rho_W*K_2 - (K_4+K_5)*\rho_T$ 3) $\frac{d\rho_C}{dt} ...
1
vote
0answers
26 views

Reduction by thermionic electrons

Certain reduction reactions require electrons as reducing agents. Is the overlapping of orbitals is necessary for electron transfer? I mean if a element $\ce{X}$ is heated and it gives out thermionic ...
2
votes
2answers
512 views

How does sulfuric acid catalyze the reaction of potassium chlorate and sucrose?

Part of the total reaction is mentioned here: http://chemistry.about.com/od/demonstrationsexperiments/ht/instantfire.htm $\ce{2KClO3(s)} + \text{heat} \rightarrow 2\ce{KCl(s)} + 3\ce{O2(g)}$ The ...
21
votes
1answer
323 views

How does Palladium dissociate H₂ so easily?

If I understand correctly, H2 in the presence of Pd readily dissociates as it dissolves into the metal. With the dissociation energy for the H—H bond being so large, how is this possible? At first I ...
12
votes
1answer
300 views

What is the chemistry behind this “petrol from air” technology?

A recent news report in the UK claimed a breakthrough in making a petrol equivalent from carbon dioxide and water: A small British company has produced the first "petrol from air" using a ...
4
votes
1answer
61 views

How does the work that won the 2012 Sustainable Chemistry Award contribute to sustainable chemistry?

I'm seeking a lay explanation for how the work of Dr Marc Taillefer that won the 2012 European Sustainable Chemistry Award, contributes to sustainable chemistry. From the press release, Dr. Taillefer ...
2
votes
1answer
68 views

What Role Does HOOH Have In Copper (II) Acetate Formation?

Mixing solid copper, 5% vinegar, and hydrogen peroxide ($\small\ce{H2O2}$) causes copper acetate to form. The process will occur very slowly without hydrogen peroxide. Adding $\small\ce{H2O2}$ speeds ...
10
votes
3answers
217 views

Energy-efficiency aside, what are the chemical constraints on CO2 capture and methanation?

Synthesising $\ce {CH4}$ from air and water (in a non-biological process) has been proposed as one form of energy storage. What are the chemical constraints at play here? That is to say, what sort of ...