page_title: Carbon nanotube supported catalyst
section_title: Carbon nanotube-supported Pd catalyst
hierarchical_section_title: Carbon nanotube supported catalyst / Applications / Carbon nanotube-supported Pd catalyst
caption_attribution_description: English: Heck arylation catalyzed by the CNT supported palladium catalyst
context_page_description: Carbon nanotube supported catalyst is a novel supported catalyst, using carbon nanotubes as the support instead of the conventional alumina or silicon support. The exceptional physical properties of carbon nanotubes such as large specific surface areas, excellent electron conductivity incorporated with the good chemical inertness, and relatively high oxidation stability makes it a promising support material for heterogeneous catalysis.
  The catalyst is a substance, usually used in small amounts relative to the reactants, that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. One or more kinds of catalysts can be loaded on another material with a high surface area, which serves as the support, to form a supported catalyst as a whole system. In a supported catalyst system, the significance of using the support are to increase the dispersion of the active phases, to have a better control of the porous structure, to improve mechanical strength, to prevent sintering and to assist catalysis. There is a wide spectrum of supports ranging from conventional and most commonly alumina to novel various kinds of activated carbon.
context_section_description: In the catalysts of Heck reaction, precious metal Pd was the most used active component. Supported Pd catalysts displayed many advantages. Compared with the traditional homogeneous Pd(OAc)₂, PdCl₂ catalysts in Heck reaction, CNTs-supported Pd catalyst has higher catalytic activity, better stability, easier separation and more satisfactory reusability.
  In experimental process, carbon nanotube supported Pd catalysts were prepared using chemical reduction. Additional chemical reductant is used to solve the agglomeration of Pd nanoparticles.
caption: Figure 2. Heck arylation catalyzed by the CNT supported palladium catalyst
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