共查询到17条相似文献,搜索用时 125 毫秒
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天然气汽车尾气引起的环境问题日益严重,传统的三效催化剂上甲烷转化率低,净化效果差,天然气汽车尾气净化催化剂受到广泛关注。概述天然气汽车尾气净化催化剂组成以及理论空燃比和稀燃比催化净化原理,介绍四类天然气汽车尾气净化催化剂研究现状,并对未来天然气汽车尾气净化催化剂发展进行展望。 相似文献
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汽车尾气净化催化剂载体 总被引:17,自引:1,他引:16
叙述了汽车尾气净化对其催化剂载体的要求, 讨论了几种已用于汽车尾气净化的催化剂载体, 比较了各种载体的性能。认为堇青石陶瓷蜂窝状载体是目前较为适合的汽车尾气净化催化剂载体。 相似文献
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稀土在汽车尾气净化方面的应用 总被引:1,自引:0,他引:1
本文简要介绍了汽车尾气催化净化的研究概况及汽车尾气净化对催化剂的性能要求。阐述了稀土催化剂净化汽车尾气的净化原理 ,总结了稀土在汽车尾气催化净化中的作用。对稀土在汽车尾气净化中的应用研究进行了归纳比较 ,展望了稀土在汽车尾气净化中的应用前景。 相似文献
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本文介绍了各种汽车尾气净化催化剂及其载体,综述了汽车尾气净化催化剂的组分及其制备的研究现状和进展,并对汽车尾气净化催化剂的发展方向提出了展望。 相似文献
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概述了我国汽车尾气净化催化剂的研究进展,对纳米稀土催化剂、不同助剂及活性组分负载量对催化剂性能的影响进行了详细阐述,指出我国汽车尾气净化催化剂的开发方向是含少量金属的稀土基催化剂. 相似文献
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车用催化剂与汽车污染治理 总被引:14,自引:1,他引:13
汽车用催化剂是当代最受人关注的催化剂之一,是当前控制汽车污染的最有效手段。本文从催化的角度,总结了二十余年来国外几代车用催化剂的发展和演变过程。同时,对发展中国家所特有的在用车排气的催化净化,进行了探讨与展望 。 相似文献
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汽车尾气净化催化剂的现状分析及对策研究 总被引:2,自引:0,他引:2
初步论述了汽车尾气催化净化的思路,以及当前国内外对汽车尾气净化催化剂的研究状况,提出了当前存在的问题以及解决问题的对策. 相似文献
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Nitric Oxide Catalysis in Automotive Exhaust Systems 总被引:10,自引:0,他引:10
Kathleen C. Taylor 《Catalysis Reviews》1993,35(4):457-481
This review covers the literature through 1991 on nitric oxide catalysis as applied to automobile exhaust systems. Attention is given to the threeway catalyst system which simultaneously promotes the reduction of nitrogen oxides and the oxidation of carbon monoxide and hydrocarbons. These systems have been used on most passenger cars in the United States since 1982. Prior to 1980, emission control catalysts were oxidation catalysts, and reduction in exhaust nitric oxide was achieved using engine modifications (i.e., exhaust gas recirculation). This review focuses on catalytic control of NO, for gasoline-fueled vehicles (not diesels and alternate fuels) and primarily on developments reported since 1982. The term NO, refers to both NO and NOz. The reader is referred to an earlier publication by the author for a general review of automobile catalytic converters [1] and to a review by Egelhoff [2] on the nitric oxide literature through 1980. The recent literature on NO, reduction in lean exhaust is cited although such catalyst systems have not reached commercial application. 相似文献
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M. A. Mashkovtsev A. K. Khudorozhkov I. E. Beck A. V. Porsin I. P. Prosvirin V. N. Rychkov V. I. Bukhtiyarov 《Catalysis in Industry》2011,3(4):350-357
In this work, we discuss the problem of the afterburning of methane from the exhaust gases of automobile engines fueled by
natural gas. In exhaust neutralizers, the PdO/Al2O3 catalyst, the main drawback of which is the reduction of its activity under the action of steam that always present in exhaust
gases, is commonly used. To improve the tolerance to steam, a series of PdO-Me
x
O
y
/Al2O3 binary catalysts (Me is Co, Cu, Fe, Ni, Mn, or Sn) was prepared and studied. Comparative tests under conditions modeling the methane afterburning
process in automobile neutralizers show that Pd catalysts promoted with nickel, cobalt, and tin oxides are more resistant
to the inhibiting action of steam. The high crystallinity of supported PdO and its uniform distribution over the surface of
modified Al2O3 are indicated as criteria for the stability of catalysts in the presence of steam. Optimization of the concentration of promotors
and the preparation method used for their introduction allows the deactivation of Pd catalysts under the action of steam to
be almost completely eliminated. 相似文献