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| 對于氣固催化反應(yīng),本征動力學(xué)實驗通常要求在等溫和消除內(nèi)外擴散影響的條件下進行。其中，外擴散影響需要考察不同裝填量的催化劑在相同的工藝條件下的反應(yīng)情況。本研究催化劑的裝填裝量分別為0.1 g、0.2 g，在100 oC下測得的CO轉(zhuǎn)化率與接觸時間的關(guān)系。在接觸時間小于某一定值,相當(dāng)于空速大于某一定值時,分別填裝不同質(zhì)量催化劑的兩條轉(zhuǎn)化率-接觸時間曲線幾近重合,表明這時外擴散影響已經(jīng)基本消除。在消除外擴散影響的基礎(chǔ)上,在相同的原料組成和空速下考察了催化劑粒度對轉(zhuǎn)化率的影響。當(dāng)催化劑平均粒徑小于某一定值時,轉(zhuǎn)化率不隨粒徑的減小而變化，此時，內(nèi)擴散的影響已經(jīng)消除。在消除內(nèi)外擴散的條件下評價了負載型催化劑的CO催化燃燒消除的本征活性。 |
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zerohead
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hudielan16(金幣+4, 翻譯EPI+1): 2010-08-12 09:11:06
|
對于氣固催化反應(yīng),本征動力學(xué)實驗通常要求在等溫和消除內(nèi)外擴散影響的條件下進行。其中，外擴散影響需要考察不同裝填量的催化劑在相同的工藝條件下的反應(yīng)情況。 For gas-solid catalytic reaction, the intrinsic kinetic experiments is usually performed under isothermal condition without internal and external diffusions. The effects of external diffusion on the catalytic reaction will be examined for different loadings under the same testing conditions. |
2樓2010-08-11 16:37:33
3樓2010-08-12 09:11:22
izhangxing
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hudielan16(金幣+5):謝謝了 2010-08-18 08:46:44
| For gas - solid catalytic reaction and intrinsic kinetics of experiments often require under the condition of isothermal and the elimination of internal and external diffusion effects. Among them, the external diffusion effects inspection needs of different loading catalyst in the reaction conditions under the same conditions. Study on catalyst packing with the volume for 0.1 g, 0.2 g, under the 100 OC in CO conversion rate and contact measuring time. Contact time is less than a certain value equivalent airspeed greater than a certain value, respectively filling quality of different catalysts for conversion of the two - time - to - contact curve near coincide, shows that external diffusion effects have basically eliminated. On the basis of elimination of external diffusion effects on the same raw material composition and airspeed investigation under the impact of the catalyst particle size on conversion ratio. As a catalyst for the average size of less than a certain value, the conversion is not as reduce and change in size, at this point, the diffusion effect has been eliminated. Under the conditions of the elimination of internal and external diffusion evaluation of CO catalytic combustion of supported catalyst for the elimination of intrinsic activity. |
4樓2010-08-17 15:09:39
xiaoying16
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| The intrinsic kinetic experiment is usually performed under isothermal condition without internal and external diffusions. In order to avoid the affection of the external mass transfer, two curves of CO conversion as a function of the GHSV were evaluated at the catalyst loadings of 0.1g and 0.2g. The external mass transfer can be negligible when the two curves coincide with each other. The affection of internal mass transfer was avoided by investigating the CO conversion as a function of the particle sizes. When the average particle sizes were small enough, the CO conversion remain the same with the change of the average particle sizes. |
5樓2010-08-18 09:01:51
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