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hjf89418新蟲 (初入文壇)
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[求助]
求助一段文字的漢譯英 化工專業(yè)
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比表面積是每克物質(zhì)中所有顆�？偙砻娣e之和，是衡量粉體材料粒子粗細(xì)（或粒徑大小）的指標(biāo)�？捉Y(jié)構(gòu)參數(shù)包括孔容積與孔徑分布等，其中孔容積決定最大吸附量。比表面積的大小與孔結(jié)構(gòu)參數(shù)共同影響物質(zhì)的許多物理及化學(xué)性能�；钚蕴渴且环N微小炭粒，比表面積大，催化活性和化學(xué)穩(wěn)定性好，所以被廣泛應(yīng)用于吸附劑和催化劑載體。測試活性炭的比表面積與孔結(jié)構(gòu)參數(shù)對于了解活性炭的吸附性能具有重要意義。 本文用氮吸附方法測定活性炭樣品的比表面積、孔容積與平均孔徑，考察了脫氣溫度、脫氣時間等對活性炭比表面積測試的影響。實驗結(jié)果表明，脫氣時間3h，脫氣溫度300℃是適宜的；活性炭樣品的質(zhì)量選在0.1600g左右，即總表面積在110～113m2時測試值較準(zhǔn)確；多點法測試比表面積時，測試點數(shù)量越多測試值越準(zhǔn)確，為提高實驗速率，選用4個點時的相對誤差在實驗允許誤差范圍內(nèi)，能夠滿足實驗要求；單點法測試比表面積的相對誤差在5%以內(nèi)，單點法作為一種快捷簡便的近似方法，基本能夠滿足實驗要求。 |
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fayfeifei
鐵桿木蟲 (著名寫手)
- 翻譯EPI: 5
- 應(yīng)助: 291 (大學(xué)生)
- 貴賓: 0.106
- 金幣: 8934.4
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- 帖子: 1220
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- 蟲號: 1303370
- 注冊: 2011-05-23
- 性別: MM
- 專業(yè): 環(huán)境污染化學(xué)
【答案】應(yīng)助回帖
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sltmac: 金幣+20, 翻譯EPI+1 2012-07-30 10:33:00
sltmac: 金幣+20, 翻譯EPI+1 2012-07-30 10:33:00
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僅供參考哈，某些專業(yè)用詞可再斟酌 Specific surface area is the sum of the surface areas of all the particles in 1 gram of the material. It indicates the particle size of powder materials. Indices of pore structure includes pore volume and pore size distribution, and the pore volume determines the maximum adsorptive capacity. Many of the physical and chemical properties are dependant on the specific surface area and pore structure. As tiny carbon particles with huge specific surface area, excellent catalystic activity, and good chemical stability, activated carbon is widely applied as adsrobent and catalystic carrier. It is of great importance for understanding the adsorption behavior of activated carbon to investigate the specific surface area and pore structure. In the present study, the method of nitrogen adsorption was employed to test the activated carbon samples for the specific surface area, pore volume and average pore size. The influence of the temperature and duration of out-gassing to the tests was also investigated. Results suggested that it was the optimal treatment when the samples were out-gassed under 300oC for 3h. To obtain the most reliable value, a sample weight of around 0.1600g was selected, when the total surface area was in the range of 110-113 m2. When tested by multi-point determination, the more the points applied, the more acurate the result would be. In order to enhance the test efficiency, a 4-point determination was selected, and the coeffeicient of variance met the requirement of the test. For single-point determination, the coeffeicient of variance was less than 5%. As a simple and rapid determination, it could meet the basic test requirement. |
3樓2012-06-29 00:06:03
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