Gases activity

Metal Oxide - Since metals are less electrophilic than silicon, metal oxide adsorbents show even stronger selectivity for polar molecules than do siliceous materials. The most commonly used metal oxide adsorbent is activated alumina, used primarily for gas drying. Occasionally, metal oxides find applications in specific chemisorption systems. For example, several processes are under development utilizing lime or limestone for removal of sulfur oxides from flue gases. Activated aluminas have surface areas in the range of 200 to 1,000 ftVft Average pore diameters range from about 30 to 80 A. 

The Density of Gases activity (eCltapter 9.4) allows you to compare the densities of various gases at different temperatures and pressures. How does the density change when the pressure is increased Why does pressure affect density this way ... 

Expose to one of the following gases activated by corona discharge ... 

Figure 25 Inorganic chemistry involved in the interconversion chlorine species in the stratosphere. The relationship between source gases, active species and reservoir species is illustrated...

Develop the catalytic removal of NH3 which is important particularly in hot gas cleaning for IGCC application of fuel gases (activities are being performed in 5FP EU project) ... 

For highly reactive gases/active surfaces (e.g., water vapor/aluminum), the rate of reaction of the environment with the newly created crack surfaces at the crack tip is limited by the rate of transport of gases by molecular (Knudsen) flow to the crack tip. The extent of reaction with the newly created crack surface, or surface coverage 9 is proportional to the rate of arrival of the gas and the time for reaction as described in Chapter 8 namely,... 

For protection against toxic gases, activated carbon is supplied in granular form. Hardness of particles is essential to maintain a firmly packed bed in the canister and minimize dusting. Because of the small space available in the canister of a ga mask the adsorptive power must be concentrated in a small volume. The carbon, therefore, should be as dense as is consistent with high intrinsic adsorptive power. A rapid rate of adsorption is essential. 

In lean and rich model exhaust gases activity tests were performed with different Pd-only catalysts and compared to a Pt/Rh-reference system based on a Al203/Ce02/Zr02 washcoat. Parts of the results are illustrated in Figure 3a and 3b. 

Reducing conditions involving burner or flue gases, activated charcoal and the like are particularly deleterious when free silicic acid is also present. In this case, platinum-silicon alloys are formed, leading to the characteristic silicon fracture. 

The in situ plasma cleaning procedure performed after CVD of dielectric thin films is one of the major emitters of PFCs in semiconductor manufacturing it can represent 50-70% of the total PFC emission in a semiconductor fabrication plant. To clean the process chambers of deposited by-products, conventional cleaning methods use CF4 or C2F6 gases activated by RF CCP (usually 13.56 MHz) inside the process chamber. These PFC gases achieve a relatively low degree of dissociation and unreacted molecules are enutted in the process... 

Varies Odor removal from waste gases (active carbon)... 

Hitachi SO2 from flue gases activated carbon greater than 100 Fixed bed Water scrubbing Prototype plant 400,000 m /h S.T.P... 

Removal of Carbon Dioxide and Methanation. About 17 to 19% of the effluent gases is carbon dioxide. This undesirable byproduct is usually removed by a number of methods, such as physical absorption, chemical reaction, or a combination of both. Removal methods include monoethanolamine process for removing acid gases, activated carbonate process based on absorption of carbon dioxide by potassium carbonate, and physical absorption systems in which solvents and agents that remove carbon dioxide are us. Generally, the choice of carbon dioxide removal depends on the overall plant design and the integration procedures needed. 

Use the Density of Gases activity eClmpter lOS) to compare the densities of two different gases at the same pressure and temperature. Explain in terms of kinetic-molecular theory why the molar mass of a gas is necessary to calculate the density of a gas, but not to determine its pressure. 

For i = a -1-1,..., c Eq. (1,139) applies, and the components are identified as solvents. The components belonging to the indexing of I = 1,..., a are known as solutes. When the solutes are not in the same state as the solution, the second convention becomes useful. This is often the case for liquid solutions of noncondensable gases. Activity coefficients defined by convention II are unsymmetricai. The relationship between and y will be discussed later in Chapter 5. Note that as 0 the corresponding y which is shown by has a defined value as Xi 0, the corresponding y which is shown by y - 1, as defined above. 

Table 1. Incorporated into Critical Thinking Questions Relating to Model 1 in Dipole Moment Greenhouse Gases Activity...

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