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茂金属催化剂负载化研究进展 总被引:2,自引:0,他引:2
综述了近年来茂金属催化剂负载化的研究进展。通过研究烯烃聚合中载体的应用对催化剂性能和聚烯烃形态的影响,进一步说明了负载的目的和必要性。 相似文献
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综述了近年来国内外负载化茂金属催化剂的研究进展,探究了负载化催化剂载体类型及负载方法对乙烯均聚物及乙烯共聚物性能的影响,并对茂金属催化剂的深入研究方向提出建议. 相似文献
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负载金属改性活性炭纤维的脱硫性能 总被引:6,自引:0,他引:6
Metal-loaded activated carbon fibers (ACFs) were prepared by impregnation and characterized by N2 adsorption at 77K, XRD, XPS and SEM. Their properties on SO2 removal were examined in a tubular fixed bed reactor with a model flue gas. Cobalt-loaded ACF showed the best activity among the prepared metal-loaded ACFs and a constant removal ratio of SO2 above 87% during continuous exposure to the flow of SO2/O2/H2O/N2 at 45℃ for more than 216h. The characteristic of the prepared loaded-ACFs showed that the exceptional activity of Co-ACF was attributed to the high amount of active sites due to modification by loading cobalt. 相似文献
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负载型金属催化剂因为其独特的催化性能在众多领域得到广泛应用。传统的催化剂制备方法有浸渍法,沉淀法,离子交换法和熔融法等。文章综述了溶剂化金属原子浸渍法,超临界技术和微波技术在负载型金属催化剂制备中的应用。 相似文献
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巢亚军 《化学工业与工程技术》2014,(4):82-82
积炭是催化剂在催化反应过程中普遍发生的现象,尤其是在乙苯直接脱氢体系中,反应物乙苯分子在金属氧化物催化剂表面很容易快速的产生积炭,导致催化剂的失活。近期,中科院金属所沈阳材料科学国家(联合)实验室催化材料研究部刘洪阳副研究员和苏党生研究员,利用乙苯直接脱氢过程反应中的积炭过程,巧妙的设计了一种钯/碳复合催化剂(Pd/C)。 相似文献
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The direct conversion of benzene to phenol by hydroxylation with hydrogen peroxide was carried out over catalyst containing various transition metals impregnated on activated carbon. Iron and vanadium impregnated catalysts gave better yields of phenol compared to copper impregnated catalysts. The activity of transition metals supported on activated carbon catalyst in the production of phenol was V > Fe > Cu. In addition to the role of transition metals in catalyzing the hydroxylation reaction, the hydrophobic nature of the activated carbon surface and also the surface acidity and basicity seems to have enhanced the performance of these catalysts. 相似文献
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木质素是制浆造纸工业的副产物,是地球上最丰富的可再生资源之一。本文简要介绍木质素的结构及其性质,并论述了木质素吸附材料的吸附性能及吸附剂的研制,详细总结了木质素基活性炭吸附剂的研究进展并探讨了今后的研究方向。 相似文献
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The objective of the present work was to study the catalytic reformation of methane in presence of carbon dioxide on activated
carbon-supported nickel and calcium catalysts. Results are very promising ones because they suggests that it is possible to
transform methane on these catalysts by using mild reaction conditions. 相似文献
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M.C. Román-Martínez J.A. Díaz-Auñón P.C. L'Argentière C. Salinas-Martínez de Lecea 《Catalysis Letters》2001,77(1-3):41-46
The catalytic activity of [PdCl2(NH2(CH2)12CH3)2] (named [Pd(TDA)]) and [RhCl(NH2(CH2)12CH3)3] (named [Rh(TDA)]) complexes for the hydrogenation of cyclohexene has been analysed both in homogeneous phase and heterogenised on activated carbon. The [Rh(TDA)] complex has been found to be more active than the [Pd(TDA)], both homogeneous and heterogenised. Experimental and modelled results indicate that these complexes follow a similar reaction mechanism, but with different rates. A clear positive effect of the carbon support has been found in the case of the complex [Rh(TDA)], which has been related to the anchorage of the aliphatic chains of the amine ligands on the activated carbon pores. Experiments in consecutive catalytic runs show that the heterogenised complexes can be used several times giving an acceptable conversion level. 相似文献
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