改性膨润土负载Au催化剂的制备及其催化氧化CO性能研究

发布时间：2017-12-27 11:25

本文关键词：改性膨润土负载Au催化剂的制备及其催化氧化CO性能研究　出处：《南昌大学》2016年硕士论文　论文类型：学位论文

【摘要】：金催化剂是自上世纪以来引起科研人员浓厚兴趣的新型催化材料,目前有着广泛的应用领域。控制金催化剂粒径尺寸在几个纳米以内是保证其高催化活性的关键,研究发现金纳米颗粒大小在5nm以下时能对催化氧化CO表现出良好的活性,但金催化剂易团聚烧结,如何制备稳定的金催化剂一直是科研工作者努力的方向。膨润土是一种以蒙脱石为主的黏土,我国膨润土资源居世界前列,矿产分布广泛,产量高且价格低廉,发展前景广阔。本论文利用膨润土独特的层状结构,用Al交联剂引入Au和活性载体,改善金催化剂的热稳定性。Fe_2O_3、TiO_2都是金催化剂的活性载体,利用Al交联剂包裹活性载体掺杂稀土对膨润土进行交联柱撑,并尝试探索无机和有机改性膨润土寻找最佳载体合成方法。采用CO氧化反应来考察催化剂的催化性能,利用BET、ICP、IR、XRD等多种表征手段,考察交联膨润土载体对金催化剂催化性能的影响。本文依托江西省丰富的膨润土资源制备出有大比表面积和良好热稳定性的Au/Al-Ti-Bent催化剂,寿命测试60h后活性只下降5%;以及低温催化性能优越的Au/Al-Fe-Ce-ABent催化剂,在40℃低温下CO转化率能达到46%,在100℃即可将CO完全氧化。
[Abstract]:Gold catalyst is a new type of catalytic material which has attracted the interest of researchers since the last century. It has a wide range of applications. Control of gold catalyst particle size in the range of a few nanometers within is the key of high catalytic activity, the study found that gold nanoparticles size on catalytic oxidation of CO showed good activity in the 5nm, but the gold catalyst agglomerate sintering, how gold catalysts stability is a research effort. Bentonite is a kind of clay based on montmorillonite. The bentonite resources in China are in the forefront of the world. The mineral resources are widely distributed, the production is high and the price is low, and the prospect of development is broad. In this paper, the unique layered structure of bentonite is used to introduce Au and active carrier by Al crosslinker to improve the thermal stability of the gold catalyst. Fe_2O_3 and TiO_2 are all active carriers of gold catalysts. Al crosslinking agent is applied to bind active carrier rare earth to pillared bentonite, and try to explore the best carrier synthesis method of inorganic and organic modified bentonite. The CO oxidation reaction was used to investigate the catalytic performance of the catalysts. The effects of crosslinking bentonite carriers on the catalytic performance of gold catalysts were investigated by means of BET, ICP, IR and XRD. This paper relies on the abundant bentonite resources in Jiangxi province were prepared with large surface area and good thermal stability of Au/Al-Ti-Bent catalyst, life test after 60H activity decreased by 5%; and the Au/Al-Fe-Ce-ABent catalysts for low temperature catalytic performance, at 40 degrees Celsius temperature conversion rate of CO can reach 46%, 100 degrees in the CO can be completely oxidized.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O643.36

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