題組內容

1. Titanium dioxide is a wide-bandgap seniconductor that is considered as an insulating dielectric in VLSI capacitors and for use in solar applications such as solar cells and photocatalyst. Thin films of TiO2 can be prepared using chemical vapor deposition from gascous titanium tetra-isopropoxide (TTIP). The overall reaction is 
Ti(OC3H7)4 → TO2+4C3H6+2H2O 
The reaction mechanism in a CVD is believed to be 
TTIP (g) + TTIP (g) 61ef8d45913bf.jpg I(g) + P (g) 
I(g)+S61ef8d45913bf.jpg I．S
 I．S → TiO2+ P2(g)
 Where I is an active intermediate, S is an active site, Pi is one set of reaction products (e.g. H2O, C3H6) and P2 is another set. Assuming the homogeneous gas-phase reaction for TTIP is in equilibrium, please answer the following question

(a) (18%) Derive a rate law for the deposition of TiO2

相關申論題

(b) (8%) The experimental results show that at 200℃ the reaction is second order at low partial pressure of TTIP and zero order at high partial pressures. While at higher temperature (300 ℃ ) the reaction is second order in TTIP over the entire pressure range. Discuss these results based on the rate law derived above. [Hint: adsorption is exothermic in general]
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2. (10%) The intensive state of a PVT system containing N chemical species andπ phases is in equilibrium. Show that the phase rule is: F = 2 - π + N, where F is the degree of freedom of the system.
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(a) (5%) The velocity is constant,
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(b) (5%) The temperature increases in the direction of flow, and
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(c) (5%)The pressure decreases in the direction of flow (Hint:  is defined as the volume expansivity and Cp is the heat capacity at constant pressure).
#451908
(a) (6%) Calculate the composition of the vapor in equilibrium with a liquid containing 60 mol % perfluoro-n-heptane and 40 mol % of n-heptane at 25℃ and 0.6 bar, assuming the solution is ideal.
#451909
(b) (10%) Please derive the expressions of the activity coefficient for both components in a binary mixture, assuming the solution obeys the regular solution theory. The excess Gibbs energy equation of the regular solution theory is as following:, where δi is solubility parameter of component i and Φi is volume fraction of component i:
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(c) (6%) Recalculate the composition in part (a), assuming the solution obeys the regular solution theory. The regular solution parameters are 
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(d) (3%) Which model (ideal solution or regular solution) provides better estimation of gas phase compositions? Please give the reason according to the gas phase composition results in (a) and (c).
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五、在液態光化學反應A→B中,A之起始濃度為12mol/L,反3鐘後 的濃度為0.72mol/L,請列出此反應的速率方程式?請注意!必須寫明單位才給分。
#441996

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110年 - 110 國立中央大學_碩士班招生考試_化學工程與材料工程學系/甲組(一般生):化工熱力學及化學反應工程#105938
110年 · #105938
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110年 · #104403