Pd/MWNTs

In this reaction the catalyst consisted of 5 wt.% Pd/MWNTs with 60% of the palladium particles being located inside the carbon nanotube channel (detailed characterization was presented in Section 7.3.1.1). Details concerning the catalyst preparation can be found in Section 7.3.1.1. The catalytic activity obtained in a batch mode at room temperature is presented in Table 7.2. The results obtained... 

For ethanol oxidation, Zheng et al. investigated the effect of multiwalled carbon nanotubes, carbon black, and activated carbon fiber (ACF) supports on the catalytic activity of Pd in alkaline media [287]. It was found that the support had a significant influence on performance, with the Pd/MWNT system giving the lowest faradaic resistance as determined by electrochemical impedance spectroscopy. It... 

Carbon nanotubes have been decorated with metal nanoparticies of Au, Ag, Pt, Pd and Co employing different procedures such as the click reaction [107], microwave treatment [106], electroless plating [108] and laser irradiation of mixtures of the individual components [109]. Pt-carbon nanotube hybrids have been used as catalysts for the conversion of nitrobenzene to aniline [110]. Tessonier et al. report that MWNTs covered with Pd nanoparticies on the interior walls can be employed for... 

CNTs can be combined with various metal oxides for the degradation of some organic pollutants too. Carbon nanotubes/metal oxide (CNT/MO) composites can be prepared by various methods such as wet chemical, sol gel, physical and mechanical methods. To form nanocomposite, CNTs can be combined with various metal oxides like Ti Oj, ZnO, WO3, Fc203, and AI2O3. The produced nanocomposite can be used for the removal of various pollutants. Nanoscale Pd/Fe particles were combined with MWNTs and the resulted composite was used to remove 2,4-dichlorophenol (2,4-DCP). It was reported that the MB adsorption was pH-dependent and adsorption kinetics was best described by the pseudo-second-order model. Iron oxide/CNT composite was reported to be efficient adsorbent for remediation of chlorinated hydrocarbons. The efficiency of some other nanocomposites such as CNT/ alumina, CNT/titania and CNT/ZnO has also been reported [60-62]. 

FIGURE 4.10 (a) CVs of the commercial Pd-C and PdNw/MWNTs in argon-blanketed 0.1 M HCIO4 at a sweep rate of 100 mV s"k (b) Corresponding polarization curves of the commercial Pt L-Pd-C and PtML/PdNw/ MWNTs in oxygen-saturated 0.1 M HCIO4 at a scan rate of 10 mV s" and a rotating speed 1600 rpm. 

FIGURE 4.11 TEM images of the (a) freestanding Pd NWs and (b) PdNp/MWNTs. (c) XRD patterns for PdNp/MWNTs, freestanding Pd NWs, Pd-C, and PdNp/MWNTs (from top to bottom). 

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