Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Sulfur reaction with oxygen

The first term of Eq. 80 represents the mass loss of char particles due to carbon combustion and the second term represents the mass loss of char particles due to sulfur reaction with oxygen. Using the stoichiometry of reactions 1 and 2, we can obtain the moles of oxygen used up in these respective reactions for any arbitrary height n as. [Pg.137]

Zinc and cadmium tarnish quickly in moist air and combine with oxygen, sulfur, phosphorus and the halogens on being heated. Mercury also reacts with these elements, except phosphorus and its reaction with oxygen was of considerable practical importance in the early work of J. Priestley and A. L. Lavoisier on oxygen (p. 601). The reaction only becomes appreciable at temperatures of about 350° C, but above about 400°C HgO decomposes back into the elements. [Pg.1205]

D. Reactions with Oxygen- and Sulfur-Containing Functions... [Pg.226]

Sulfur compounds " are better nucleophiles than their oxygen analogs (p. 439), so in most cases these reactions take place faster and more smoothly than the corresponding reactions with oxygen nucleophiles. There is evidence that some of these reactions take place by SET mechanisms. ... [Pg.495]

B. Reactions with Oxygen and Sulfur Nucleophiles 1. Hydrolysis... [Pg.179]

W.H. Orme-Johnson and H. Beinert, Formation of the superoxide anion radical during the reaction of reduced iron-sulfur proteins with oxygen. Biochem. Biophys. Res. Commun. 36, 905-911 (1969). [Pg.202]

In most cases, the reaction of sulfur tetrafluoride with oxygen functions requires the presence of catalytic to molar amounts of hydrogen fluoride or Lewis acid type fluorides. Standard quality sulfur tetrafluoride, unless special precautions are taken, is unavoidably contaminated by trace amounts of hydrogen fluoride. The existence of ionic species SF3+ and HF2 in the SF4/HF system has been documented by spectral and conductometric investigations34 and there is evidence from vapor-pressure measurements of retardation of the reaction by coordination of hydrogen fluorine on the carbonyl oxygen.35... [Pg.325]

Acid Rain Acid rain, a second major environmental problem, results primarily from the production of sulfur dioxide, SC 2, that accompanies the burning of sulfur-containing coal in power-generating plants. Sulfur dioxide is slowly converted to SO3 by reaction with oxygen in air, and SO3 dissolves in rainwater to yield dilute sulfuric acid, H2SO4. [Pg.365]

Compare the reaction of white phosphorus and the reaction of sulfur in the Reactions with Oxygen movie eChapter 14.8). Which of these two reactions do you think has the higher activation energy For each reaction, sketch an energy profile similar to the one in Figure 12.14 (page 500). [Pg.609]

Reactions of the Group Vb elements with the halogens are relatively straightforward. Reactions with oxygen and with sulfur are less so. [Pg.251]

For example, the unbalanced equation for the reaction of sulfur dioxide with oxygen to give sulfur trioxide is... [Pg.221]

The Benson mechanism can in principle be extended without major modifications to insertion reactions of other divalent species, such as oxygen and sulfur atoms. With oxygen, Yamaaaki and Cvetanovid have shown recently that 0( Z>) atoms preferentially insert, while 0( P) atoms abstract. This despite the fact that the singlet state hes some 48 kcal./ mole above the ground triplet state. On the other hand, sulfur atom reactions seem compatible with the proposed mechanism. Thus, if one attempts to apply it for the insertion of S( D) atoms, one finds that its predictions are consistent with the experimentally observed trend in the reaction rates. Here the transition state, due to the ionization potential and electron affinity of S( Z)) atoms being higher than those of alkyl radicals (9.2 and 2.2 e.v., respectively) could be formulated as... [Pg.164]

On the other hand, the adducts with a carbon-carbon linkage, e.g. 6-cyanodihydrobenzophenanthridines (Scheme 1, Nu = CN) are rather re-sistent to acids. A number of reactions with carbon nucleophiles (cyanide, Grignard reagent, nitromethane, acetone, butanone, acetaldehyde) are known and weU documented in the literature [8], Only a little is known about QBA reactions with oxygen, nitrogen, and sulfur nucleophiles [8]. [Pg.167]

Alemozafar AR, Madix RJ (2005) Surface reorganization accompanying the formation of sulfite and sulfate by reaction of sulfur dioxide with oxygen on Ag(lll). J Chem Phys 122 214718... [Pg.250]

It is insoluble in water, ammonia, hydrochloric, and sulfuric acid, but is decomposed by nitric acid. Reaction with oxygen occurs at 650-700 °C and thermal decomposition in vacuum starts at 600-620 °C. [Pg.167]


See other pages where Sulfur reaction with oxygen is mentioned: [Pg.401]    [Pg.193]    [Pg.429]    [Pg.249]    [Pg.159]    [Pg.47]    [Pg.271]    [Pg.108]    [Pg.77]    [Pg.49]    [Pg.925]    [Pg.219]    [Pg.413]    [Pg.141]    [Pg.256]    [Pg.275]    [Pg.341]    [Pg.4]    [Pg.911]    [Pg.1240]    [Pg.164]    [Pg.215]    [Pg.315]    [Pg.503]    [Pg.119]    [Pg.408]    [Pg.51]    [Pg.1]    [Pg.3511]    [Pg.113]   
See also in sourсe #XX -- [ Pg.938 ]




SEARCH



Oxygen sulfur

Reaction with oxygen

Sulfur reaction with

© 2024 chempedia.info