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zheng_533银虫 (正式写手)
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帮忙翻译一篇摘要，急！
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二氧化锆是一种被广泛应用于能源、环境、材料领域的重要原料，具有许多优良的物理化学及材料工艺特性。 化学性能稳定，它的表面具有弱酸弱碱为双功能特性[1]，它又是P型半导体，易产生氧空穴即可作为催化剂又可作为催化剂载体和助剂使用，近年来在催化领域颇受重视。而目前， 在催化领域中应用的关健问题是从氢氧化锆凝胶到 的热处理过程中表面积的损失和稳定性的降低。一些研究者认为介孔氧化锆在焙烧时的稳定性与颗粒的大小有关，颗粒大于16nm的介孔结构易于发生相转变，同时比表面积下降[2-3]。还有一些研究者认为在介孔氧化锆中引入一些其他金属元素及其氧化物有益于其结构的稳定。Mercera等[4]将 和 引入 中后，四方介孔氧化锆的稳定性增强，且没有微孔出现。 本文通过添加不同含量的稀土元素La（硝酸镧为原料）改性 / (以下记为W/Z)固体酸催化剂，分别采用常用的共沉淀法和浸渍法制得催化剂，分别考察加入La量、仲钨酸胺浓度和焙烧温度，制备方法等对催化剂结构和酸性的影响。制备的La + / (以下记为L+W/Z)固体超强酸做相互对比实验，采用XRD、BET、Hammett指示剂法对催化剂进行表征。 关键词：共沉淀法；XRD;热稳定性；焙烧温度；比表面积；孔径 |
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liufengbao100
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wypward(金币+1):辛苦啦，谢谢参与 2010-05-27 17:37:37
bancage(金币+1):辛苦 2010-05-28 21:38:12
wypward(金币+1):辛苦啦，谢谢参与 2010-05-27 17:37:37
bancage(金币+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楼2010-05-27 16:17:18
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首先给出该摘要翻译。 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楼2010-05-28 15:55:27
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zheng_533(金币+50, 翻译EPI+1):恩，非常深刻！有道理！我这几天会再改一下，希望改好以后，你能抽空再帮我翻译一下，并给出一些宝贵的意见！谢谢！ 2010-05-28 17:33:09
bancage(金币+2):很用心 谢谢提建议 呵呵 2010-05-28 21:38:38
zheng_533(金币+50, 翻译EPI+1):恩，非常深刻！有道理！我这几天会再改一下，希望改好以后，你能抽空再帮我翻译一下，并给出一些宝贵的意见！谢谢！ 2010-05-28 17:33:09
bancage(金币+2):很用心 谢谢提建议 呵呵 2010-05-28 21:38:38
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有几点意见给您作参考： 1. 您说这是一份摘要，但是用了三分之二的篇幅来讲述二氧化锆的性能及现在应用中的问题和一部分文献资料。只有约三分之一来讲您的论文内容。是不是有些主次颠倒？ 2. 摘要第二段是讲您的论文内容，但是描述不清，用什么来制备什么以及主要研究的是什么（哪种催化剂）没有写明白。比如，首先用La改性固体催化剂，后来两种方法制备的又是什么催化剂，没有说。 3. 摘要只说了所制备材料及用何种方法来研究，但是没有说重点——您得出的结论是什么？La改性对二氧化锆催化剂的作用，改善了什么性能，等等，统统没有交代。 综上所述，这是一篇不成功的摘要，读者通过摘要几乎不能获得文章的主要精髓。 |
4楼2010-05-28 16:05:01
