diffusion controlled reaction 中文意思是什麼
diffusion controlled reaction
解釋
擴散控制的反應-
Based on the analysis of gas - solid multiphase catalytic reaction, the chemical reaction model is established. when the reaction is controlled by the chemical dynamic, the reaction rate is introduced by consideration of the adsorption and desorption effects. when the reaction is controlled by mass transfer, the diffusion coefficient is established which can present the flow rate increases in small reynolds domain ; for the internal diffusion, the internal diffusion coefficient is derived, and then the internal diffusion is coupled with chemical reaction to represent the phenomenon that the diffusion and the chemical reaction occur cocurrently
本文在考慮催化轉化器載體內發生的傳熱傳質現象的基礎上，建立了催化轉化器的一維單孔道和三維多孔道傳熱傳質模型;在分析載體內以氣-固多相催化反應為特點的工作機理的基礎上，建立了催化轉化器的化學反應模型:當催化轉化處于化學動力學控制區時，引入了考慮吸附、表面反應和脫附的表面化學反應速率公式，當催化轉化處于質量輸運控制區時，引入了決定外擴散能力的擴散系數公式和和決定內擴散速率的內擴散系數公式，並與化學反應速率相耦合，得出由擴散過程決定的化學反應速率公式。 -
The electrochemical impedance spectroscopy of anodic reaction shows that the formation of black nickel was mainly controlled by electrochemical reaction at low anodic potential, and is mainly controlled by electrochemical reaction and diffusion at high anodic potental. with the increasing of anodic potential., the formation of black nickel is still controlled by electrochemical re
陽極反應的電化學阻抗譜表明，氧化電位較低時ni （ oh ） :氧化生成黑鎳的過程主要受電化學反應所控制，電位較高時，黑鎳形成過程主要受電化學反應及擴散混合控制，電位進一步增加，析氮反應占據主導優勢，陽極氧化過程仍主要受電化學反應及擴散混合控制。 -
An apparent activation energy of 182. 35kj / mol was obtained for the range of 1250 c to 1350 c, and that of 82. 32kj / mol for the range of 1350 c to 1400 c. at the same time, the relation between reaction velocity and reaction time is linear in the range of 1250 c to 1350 c, but it is a parabola curve in the range of 1350 c to 1400 c. so it can be concluded that the process undergone in the range of 1250 c to 1350 c is controlled by chemical reaction while that in the range of 1350 c to 1400 c by diffusion
本實驗採用的試樣是以鈦白粉和活性碳按1 ： 30的比例混合料為原料，在6mp下成型為37 . 2 26mm的柱形樣塊，分別在1250 、 1350和1400于氮化爐中測定反應速率與時間的關系。當反應在1250 1350時，表觀活化能為182 . 35kj mol 160kj mol ，反應速率與時間的關系是線性的，說明此階段反應由化學反應控制。當反應在1350 1400時，表觀活化能為82 . 32kj mol 160kj mol ，反應速率與時間的關系符合拋物線方程，說明此階段反應由擴散控制。 -
As to epoxy / toa / org - mmt system, the reaction order was 0. 9 and active energy was 66kj / mol by kissinger method ; and a similar result was obtained by ozawa method. the curing reaction was controlled clearly by diffusion mechanism in the later stage of curing reaction without addition of org - mmt, which leads to the increment of active energy with extend of curing ; as to the curing system with addition of org - mmt, the value of active energy was always kept the same level, which can be explained by the catalytic function of amine salt inserted in the galleries of org - mmt
對于環氧桐油酸酐有機蒙脫土固化體系用kissinger方法看到固化體系的反應級數均為0 . 9左右，表觀活化能值為66kj mol ； ozawa方法的處理結果與之近似，但從ozawa方法可以看到未加入有機蒙脫土的體系在反應後期固化反應明顯受擴散控制，表現為活化能隨固化程度的增加而增加；而加入有機蒙脫土的體系，其表觀活化能則自始至終表現的較為均勻。 -
It was confirmed that the first reaction layer of tic with very fine crystal grains is due to the reaction ti + sic - tic + si. this reaction is a reaction - controlled one. however, the other reactions in the second step a re controlled by elements diffusion
Scs一6sic / ti3ai復合材料的界面反應產物可多達6層，依次為:緊挨著纖維的晶粒細小的tic層、晶粒細小的tissi ;層、等軸晶粒的tic層、 ti3si層、 ti3aic層及ti5si3層。
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