Download Adsorption, Surface Area, & Porosity, Second Edition by S. J. Gregg PDF

By S. J. Gregg

ISBN-10: 0123009561

ISBN-13: 9780123009562

The significant goal of the second one variation of this e-book is still similar to that of the 1st version: to offer a serious exposition of using the adsorption tools for the review of the outside and pore dimension distribution of finely divided and porous solids.

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Extra resources for Adsorption, Surface Area, & Porosity, Second Edition

Sample text

The rate then increases to a maximum as the products are formed and then decreases to a low value as the reactants are consumed. Consider the following mechanism for an autocatalytic reaction: k 2 A  1 → B + C (1-116) k (1-117) 3 2 AB  → 3B + C (1-118) 2 A + B  → AB k where AB is an intermediate complex. 5 (1-121) Substituting Equation 1-121 into Equation 1-119 gives (+ rC ) = k1C2A + k22 C A C B (1-122) Therefore, the mechanism results in a rate expression in which species B is responsible for the autocatalytic behavior.

A detailed description of a chemical reaction outlining each separate stage is referred to as the mechanism. Mechanisms of reactions are based on experimental data, which are seldom complete, concerning transition states and unstable intermediates. Therefore, they must to be continually audited and modified as more information is obtained. Reaction steps are sometimes too complex to follow in detail. In such cases, studying the energy of a particular reaction may elucidate whether or not any intermediate reaction is produced.

Figure 1-3 shows the curve of an unstable intermediate. Generally, all practical reactions occur by a sequence of elementary steps that collectively constitute the mechanism. The rate equation for the overall reaction is developed from the mechanism and is then used in reactor design. Although there are cases where experimental data provide no information about intermediate chemical species, experimental data have provided researchers with useful guidelines in postulating reaction mechanisms. Information about intermediate species is essential in identifying the correct mechanism of reaction.

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