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zheng_533銀蟲 (正式寫手)
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[交流]
幫忙翻譯一篇摘要，急！
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二氧化鋯是一種被廣泛應(yīng)用于能源、環(huán)境、材料領(lǐng)域的重要原料，具有許多優(yōu)良的物理化學(xué)及材料工藝特性。 化學(xué)性能穩(wěn)定，它的表面具有弱酸弱堿為雙功能特性[1]，它又是P型半導(dǎo)體，易產(chǎn)生氧空穴即可作為催化劑又可作為催化劑載體和助劑使用，近年來在催化領(lǐng)域頗受重視。而目前， 在催化領(lǐng)域中應(yīng)用的關(guān)健問題是從氫氧化鋯凝膠到 的熱處理過程中表面積的損失和穩(wěn)定性的降低。一些研究者認為介孔氧化鋯在焙燒時的穩(wěn)定性與顆粒的大小有關(guān)，顆粒大于16nm的介孔結(jié)構(gòu)易于發(fā)生相轉(zhuǎn)變，同時比表面積下降[2-3]。還有一些研究者認為在介孔氧化鋯中引入一些其他金屬元素及其氧化物有益于其結(jié)構(gòu)的穩(wěn)定。Mercera等[4]將 和 引入 中后，四方介孔氧化鋯的穩(wěn)定性增強，且沒有微孔出現(xiàn)。 本文通過添加不同含量的稀土元素La（硝酸鑭為原料）改性 / (以下記為W/Z)固體酸催化劑，分別采用常用的共沉淀法和浸漬法制得催化劑，分別考察加入La量、仲鎢酸胺濃度和焙燒溫度，制備方法等對催化劑結(jié)構(gòu)和酸性的影響。制備的La + / (以下記為L+W/Z)固體超強酸做相互對比實驗，采用XRD、BET、Hammett指示劑法對催化劑進行表征。 關(guān)鍵詞：共沉淀法；XRD;熱穩(wěn)定性；焙燒溫度；比表面積；孔徑 |
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zheng_533(金幣+50, 翻譯EPI+1):恩，非常深刻！有道理！我這幾天會再改一下，希望改好以后，你能抽空再幫我翻譯一下，并給出一些寶貴的意見！謝謝！ 2010-05-28 17:33:09
bancage(金幣+2):很用心 謝謝提建議 呵呵 2010-05-28 21:38:38
zheng_533(金幣+50, 翻譯EPI+1):恩，非常深刻！有道理！我這幾天會再改一下，希望改好以后，你能抽空再幫我翻譯一下，并給出一些寶貴的意見！謝謝！ 2010-05-28 17:33:09
bancage(金幣+2):很用心 謝謝提建議 呵呵 2010-05-28 21:38:38
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有幾點意見給您作參考： 1. 您說這是一份摘要，但是用了三分之二的篇幅來講述二氧化鋯的性能及現(xiàn)在應(yīng)用中的問題和一部分文獻資料。只有約三分之一來講您的論文內(nèi)容。是不是有些主次顛倒？ 2. 摘要第二段是講您的論文內(nèi)容，但是描述不清，用什么來制備什么以及主要研究的是什么（哪種催化劑）沒有寫明白。比如，首先用La改性固體催化劑，后來兩種方法制備的又是什么催化劑，沒有說。 3. 摘要只說了所制備材料及用何種方法來研究，但是沒有說重點——您得出的結(jié)論是什么？La改性對二氧化鋯催化劑的作用，改善了什么性能，等等，統(tǒng)統(tǒng)沒有交代。 綜上所述，這是一篇不成功的摘要，讀者通過摘要幾乎不能獲得文章的主要精髓。 |
4樓2010-05-28 16:05:01
liufengbao100
木蟲 (正式寫手)
foreverhappy
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wypward(金幣+1):辛苦啦，謝謝參與 2010-05-27 17:37:37
bancage(金幣+1):辛苦 2010-05-28 21:38:12
wypward(金幣+1):辛苦啦，謝謝參與 2010-05-27 17:37:37
bancage(金幣+1):辛苦 2010-05-28 21:38:12
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abstract Zirconia is a widely used energy, the environment, an important raw material in the field, with many excellent physical and chemical properties and materials technology. Chemical stability, its surface has a weak acid weak base for the dual-function feature [1], it is a P-type semiconductor, the hole can easily produce oxygen as a catalyst but also as a catalyst and additives used in recent years in Catalysis popular attention. At present, the field of application in catalysis Key issues from the zirconium hydroxide gel to the surface during heat treatment reduced the loss and stability. Some researchers believe that mesoporous zirconia calcined at the time of stability and particle size of the particles larger than 16nm mesoporous structure of the phase transition is easy, while the specific surface area decreased [2-3]. Some researchers believe that the introduction of mesoporous zirconia and oxides of other metals benefit the stability of its structure. Mercera, etc. [4] to and after the introduction of the Quartet, the stability of mesoporous zirconia increased, and there is not porous. In this paper, different content of rare earth elements La (lanthanum nitrate as raw materials) Modified / (hereinafter denoted as W / Z) of solid acid catalysts, respectively, and co-precipitation method commonly used impregnation catalysts were investigated by adding La content, Chung acid amine concentration and calcination temperature, preparation method on the structure and acidity of the catalyst. Preparation of La + / (Following is recorded as L + W / Z) solid superacid to do with each other comparative experiments, using XRD, BET, Hammett indicator method to characterize the catalysts. Keywords: coprecipitation; XRD; thermal stability; calcination temperature; specific surface area; aperture [ Last edited by liufengbao100 on 2010-5-27 at 16:22 ] |
2樓2010-05-27 16:17:18
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首先給出該摘要翻譯。 Abstract: Zirconia is a kind of important material which is widely used in fields such energy, environment and materials. It has many excellent physical-chemical and material-technology characteristics. Its chemical property is stable; its surface possesses dual-functional feature of weak acid and weak base[1]; it is P-type semiconductor, and oxygen vacancy is easily formed. It can be used as catalyst support and assistant. Recently ZrO2 has attached much attention in the catalytic field. At the present time, however, the key problem in application of catalytic field is the loss of the surface area and decrease of the stability in the heat treatment from the zirconium hydroxide gel to ?. Some researchers thought that the stability of mesoporous zirconia during calcinations process is relative to the particle size. The phase transformation easily occurs for the mesoporous structure with particle size larger than 16 nm; meanwhile the specific surface area is decreased[2,3]. But some other researchers considered that introduction of other elements and their oxides to mesoporous zirconia is helpful for the structure stability. Study of Merca et al[4] indicated that the stability of tetragonal mesoporous zirconia is increased without micropores after ? and ? introduction. In this paper, the solid acid catalyst (W/Z) was modified by rare earth element La of different contents. The catalysts were prepared by commonly-used coprecipitation method and dipping method. The effects of La content, ammonium paratungstate concentration, calcination temperature and preparation method on the structure and acidity of the catalysts were studied. The prepared La+W/Z was also studied for comparison. The catalysts were characterized by XRD, BET and Hammett. Key words: coprecipitation method; XRD; calcinations temperature; specific surface area; pore size |
3樓2010-05-28 15:55:27
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