共查询到20条相似文献,搜索用时 125 毫秒
1.
分别以MnO2和合成普鲁士蓝(PB/XC-72R)作为催化剂时,考察其对甲醇和双氧水的催化性能,发现两者均可以实现对双氧水的选择性催化。以开发的Z-NiPt为阳极催化剂,以MnO2与PB/XC-72R为阴极催化剂,组成甲醇双氧水单腔体电池,并测试电池的性能。结果表明:以PB/XC-72R为阴极的单腔体燃料电池的最大功率可达9.1 mW。该研究验证了甲醇单腔体新型燃料电池的可行性,为后续甲醇双氧水单腔体燃料电池开发奠定了基础。 相似文献
2.
考察了以CuBr_2与具有不同烷基支链和阴离子类型的吡啶离子液体组成的催化剂体系对甲醇一步液相氧化合成甲缩醛(DMM)的催化性能,发现CuBr_2-N-乙基吡啶溴盐催化性能最好。考察了不同催化剂组成、催化剂浓度、反应温度、氧气压力、反应时间对甲醇一步液相氧化合成甲缩醛反应的影响,得到的最佳反应条件为:n(CuBr_2)/n(N-乙基吡啶溴盐)=1.0、催化剂质量浓度为40 g/L、反应温度130℃、氧气压力3 MPa和反应时间4 h,在该条件下甲醇转化率达到26.1%,DMM选择性达到95.0%。CuBr_2-N-乙基吡啶溴盐重复使用9次后,甲醇转化率为22.2%,DMM选择性为91.2%,催化活性仍然保持稳定。 相似文献
3.
4.
借助Excel的功能,应用物理化学和催化理论知识,对甲醇合成过程进行了热力学分析,讨论了温度,压力,气源,催化剂等条件对甲醇合成过程中主副反应的影响,为甲醇合成催化剂的制备及优化甲醇合成条件提供了热力学方面的参考意见。 相似文献
5.
6.
《化学工业与工程技术》2006,27(2):43-43
由南化集团研究院开发完成的C307型中低压合成甲醇催化剂,适用于各种原料、各种工艺、各种类型的反应器,催化CO、CO2和H2合成甲醇的反应(尤其是中低压反应)。 相似文献
7.
8.
研究了在不同载体上的钯铜系金属系列催化剂上.甲醇直接氧化羰基化合成碳酸二甲酯的催化性能。考察了催化剂组成及反应条件对合成碳酸二甲酯的影响。实验得出,活性碳为最佳载体,催化剂活性组分为双金属Pdcl2-CuCl2,最佳反应温度为130℃,一氧化碳与氧气的物质的量比为1.2。 相似文献
9.
10.
11.
A general protocol for the synthesis of Pt–Sn/C catalysts for ethanol electrooxidation by the polyol method is developed after a systematic variation of the preparation variables. This protocol enables the complete transfer of all catalytic elements in the preparation solution to the catalyst support; thereby providing a convenient means of catalyst composition control. Water is a necessary co‐solvent for ethylene glycol in the polyol synthesis of Pt–Sn/C catalysts. The best preparation medium for controlling the particle size to small sizes is 0.1 M NaOH solution in a mixture of equal volumes of water and ethylene glycol. With this medium composition Pt–Sn/C catalysts with the optimized target Pt:Sn atomic ratio of 3:1 could be expeditiously prepared for ethanol electrooxidation. 相似文献
12.
Weixin Huang 《Topics in Catalysis》2013,56(15-17):1363-1376
Oxides are widely used in heterogeneous catalysis, thus fundamental understanding of structure–activity relationships of oxide catalysts is of great importance for the improvement and design of efficient catalysts. Recently the synthesis of oxide nanocrystals with uniform and well-defined structures has achieved great progress, and these oxide nanocrystals consist of a novel type of model catalysts for oxide catalysts. Employing oxide nanocrystal model catalysts, crystal plane-dependent surface reactivity and catalytic property of oxide catalysts have been successfully revealed. The recent progress is reviewed in this article and two systems are highlighted. One is cuprous oxide whose crystal planes affect the surface reactivity and catalytic property dominantly by crystal plane-dependent surface composition and structure; the other is ceria whose crystal planes affect the surface reactivity and catalytic property dominantly by crystal plane-dependent concentration and type of oxygen vacancy. 相似文献
13.
14.
C. Pirola C. L. Bianchi A. Di Michele P. Diodati S. Vitali V. Ragaini 《Catalysis Letters》2009,131(1-2):294-304
The iron loading of catalysts, supported on SiO2, was investigated between 10 and 75 wt%, with and without the addition of promoters (K and Cu), in order to highlight the different catalytic performances of the samples in the Fischer–Tropsch synthesis. An optimization study of the prepared catalysts (active metal/promoters ratio, catalysts’ activation procedure before the Fischer–Tropsch runs, influence of the feeding gas composition) is reported. The mechanical resistance of the catalysts was also evaluated using a suitable method involving ultrasound. 相似文献
15.
费托合成催化剂的研究进展 总被引:1,自引:0,他引:1
介绍了费托合成的研究现状,分析了费托合成催化剂的组成,重点评述了恬性组分、载体、助剂等因素在催化剂制备过程中对催化剂的活性、选择性等方面的影响,并对费托合成催化剂研究领域存在的问题进行了探讨。 相似文献
16.
Bhalchandra M. Bhanage Shin-ichiro Fujita Yanfeng He Yutaka Ikushima Masayuki Shirai Kazuo Torii Masahiko Arai 《Catalysis Letters》2002,83(3-4):137-141
Smectites containing magnesium and/or nickel in the lattice were found to be excellent heterogeneous catalysts for the concurrent synthesis of dimethyl carbonate and ethylene glycol by transesterification of ethylene carbonate with methanol. The catalytic activity strongly depends on the elemental composition of the catalysts and is correlated with the number of moderately basic sites present on the catalyst. 相似文献
17.
18.
19.
20.
整体式催化剂性能及应用的研究进展 总被引:9,自引:0,他引:9
由整体式催化剂的结构特点出发.系统地阐述了整体式催化剂具有的一系列超越传统颗粒状催化剂的独特优越性,提出了其在三相反应中有待解决的几个关键性问题。同时概述了整体式催化剂在环保领域和化工产品合成领域的应用、研究现状和展望。 相似文献