Hydrogen iodide, decomposition

Molecular Statistics of the Bimolecular Hydrogen Iodide Decomposition. The theory of activation by collision. 

When the comparison of the two values of E is made for the hydrogen iodide decomposition, practically identical values, namely 44,400 and 44,000 calories, are obtained. 

For the hydrogen iodide decomposition the heat of activation is 25,000 calories. This is very considerably lower than the value 44,000 calories associated with the homogeneous reaction. 

A small scale sulphur iodine process loop made of Pyrex glass was built and operated. The sulphuric acid section and Bunsen reaction section was operated successfully in 2006. In 2008, hydrogen iodide decomposition aided by electro-dialysis (EED) (Hong, 2007) was demonstrated to produce 3.5 litres per... 

Materials Options for Section III Hydrogen Iodide Decomposition... 

There are two main issues concerning the chemistry of the reaction and the separation. One is how to separate the hydriodic acid and sulfuric acid produced by the Bimsen reaction. The other is how to carry out the hydrogen iodide decomposition section, where the presence of azeotrope in the vapor-liquid equilibrium of hydriodic acid makes the energy-efficient separation of HI from its aqueous solution difficult and also unfavorable reaction equilibrium limits the attainable conversion ratio of HI to a low level, ca. 20%. 

In (92), there is a four-center exchange of a bonds. In principle, six-center trimolecular reactions involving three diatomic molecules could be in this group, providing only o bonds are permitted. Although several elementary reactions of the type (92) have been studied (Glasstone et al., 1941), there appear to be few gas-phase processes which follow this indicated mechanism. The once-classical example of a bimolecular reaction, i.e. hydrogen iodide decomposition (93), is actually a multistep... 

Question Calculate for the hydrogen iodide decomposition reaction... 

Question A reaction vessel is filled with the following gas partial pressures at a temperature of 298 K Pgj = 20.0 atm, = 3.0 atm, and = 4.0 atm. The gases are then allowed to react (via the hydrogen iodide decomposition reaction) until equilibrium is established. Calculate the resulting equilibrium partial pressures for all three gases. 

Solution From Equation 2.21 we can calculate the equilibrium constant K, for the hydrogen iodide decomposition reaction at T = 298 K ... 

In this example, 2 >, so the hydrogen iodide decomposition reaction will actually proceed backward to the direction written in Equation 2.7 In other words, the and H2 gases will react to form additional HI in this scenario. This result may not be obvious based on how much larger the initial HI gas pressure is compared to the initial I2 and H2 gas pressures. This illustrates why it is important to evaluate both Q and K to determine the direction of the reaction. In the case of the hydrogen iodide decomposition reaction, AG° is large and positive, and therefore the reverse reaction is strongly favored. 

Question For the hydrogen iodide decomposition reaction, you have determined that Z = 1.6 X 10 at r = 298 K while A" = 8.0 x 10 at r = 516 K. Based on this information, estimate AH° and AS° for this reaction under the assumption that these quantities do not change with temperature. 

Question As we learned in Chapter 2, the hydrogen iodide decomposition... 

The temperature-independent reaction rate observed sometimes and recognized by the temperature coefficient of unity indicates that the reaction mechanism is simple. Indeed, turning to the above reaction mechanism of hydrogen iodide decomposition, we find for the stationary reaction rate w = —d[HI]/dt = 2d[l2]/dt. 

Past studies have focused on not only the process evaluation using a commercial computer code, but also the screening test of the component structural materials. Experiments to develop the catalysts for sulfur trioxide and hydrogen iodide decompositions were carried out successfully, and their manufacturing technologies were established. The experimental feasibility test of a 3.5 NL H2/h-scale SI test facility under atmospheric operation conditions has been performed in early 2008. As a result, we secured the continuous operation hydrogen production data for 6 h. 

For example, Bodenstein studied hydrogen iodide decomposition according to ... 

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