Abatement of NO Using Rhodium Catalysts Supported on Carbon Nanotubes: Carbon as Support Material and Reducing Agent

Beyer, Hans; Chatziapostolou, Konstantinos; Köhler, Klaus

doi:10.1007/s11244-009-9340-z

Cited by 17 publications

(9 citation statements)

References 19 publications

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“…The co-present Cu 0 can be attributed to the reduction of part Cu ? over carbon surface during sample calcination at 350°C under argon since carbon itself served as the reducing agent (Beyer et al 2009). It was noted that no Cu ?…”

Section: Effect Of Cucl Loading On Co and N 2 Adsorptionmentioning

confidence: 99%

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Preparation of CuCl@AC with high CO adsorption capacity and selectivity from CO/N2 binary mixture

Huang

et al. 2015

Adsorption

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The objective of this work is to develop CuCl@AC adsorbent with high CO capacity and selectivity from CO/N 2 binary gas mixture. A series of CuCl@AC adsorbents were prepared by a solid-state auto dispersion method, and then characterized by N 2 adsorption test, XRD and XPS. CO and N 2 adsorption isotherms on the adsorbents were measured by a volumetric method. The adsorption isotherms and selectivities of CuCl@AC adsorbents for CO/N 2 binary mixture were estimated on the basis of ideal adsorbed solution theory (IAST). Results showed that (a) CO uptakes of CuCl@AC increased with CuCl loading in the loading range of 0-1.2 g/g. The maximal CO adsorption capacity of the CuCl@AC with CuCl loading of 1.2 g/g reached 38 cc/g at the P/P 0 of 0.40, around 8 times of that over the original AC; (b) calcination time for the preparation of Cu(I)@AC had significantly impact on CO adsorption of the adsorbents due to valence change of Cu species on carbon surfaces. XPS analysis indicated that when the calcination time was optimized to be 1 h at 350°C under argon, the prepared Cu(I)@AC had the highest percentage of Cu ? species on its surfaces, and consequently it had the highest CO capacity among the adsorbents since adsorptive species responsible for CO adsorption is Cu ? ; (c) The IAST-predicted CO/N 2 adsorption selectivities of 1.2CuCl/AC decreased with pressure. Its CO/N 2 selectivity was up to 100-450 at low pressure range of 0-10 kPa, and it remained in the range of 50-100 at higher pressure range of 20-100 kPa. The high adsorption capacity and selectivity of Cu(I)@AC adsorbents made it a promising adsorbent for CO/N 2 mixture separation.

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Section: Effect Of Cucl Loading On Co and N 2 Adsorptionmentioning

confidence: 99%

“…was reduced to Cu ? and even Cu 0 as carbon itself served as the reducing agent (Beyer et al 2009). As a result, when the calcination time increased from 0.5 to 1 h, percentage of Cu 2?…”

Section: Effect Of Calcination Time On Co Adsorptionmentioning

confidence: 99%

Preparation of CuCl@AC with high CO adsorption capacity and selectivity from CO/N2 binary mixture

Huang

et al. 2015

Adsorption

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“…Eq. 1 describes the dissociative adsorption of N 2 O producing molecular nitrogen and For rhodium catalysts, oxygen desorption is generally considered as the rate limiting step in related reactions such as the decomposition of NO [7], while this is not necessarily the case for the decomposition of N 2 O. Many rhodium catalysts suffer from inhibition by oxygen, but some do not [8,9,10].…”

Section: Eq 1 Tomentioning

confidence: 99%

Decomposition of nitrous oxide by rhodium catalysts: Effect of rhodium particle size and metal oxide support

Beyer

Emmerich

Chatziapostolou

et al. 2011

Applied Catalysis A: General

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The catalytic decomposition of N 2 O by small rhodium particles (d m = 1.0 to 2.4 nm) supported on various metal oxides was studied in the absence and presence of oxygen in the feed gas and chloride on the catalyst surface. The superior catalytic performance of Rh/MgO and Rh/SiO 2 compared to Rh/CeO 2 , Rh/Al 2 O 3 and Rh/TiO 2 is attributed to relatively large rhodium particles (d m = 2.1 to 2.4 nm). The degree of inhibition caused by oxygen and chloride is found to vary with the acid-base properties of the support materials.

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“…Pure rhodium oxides belong to the most active oxidic catalysts for the decomposition of N 2 O [84]. Therefore, several catalytic studies have been focused on the decomposition of N 2 O at metallic and oxidic Rh particles [85][86][87][88][89][90][91][92][93][94]. Uetsuka [87] and Tanaka [88] have demonstrated with isotope studies the oxygen bound at the catalyst surface plays a key role for the decomposition, which follows a Langmuir-Hinshelwood mechanism.…”

Section: Reactivity Of Rh Surface Oxidesmentioning

confidence: 99%

Low-dimensional surface oxides in the oxidation of Rh particles

Mittendorfer

2010

J. Phys.: Condens. Matter

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The oxidation of rhodium particles leads to the formation of low-dimensional nanostructures, namely ultrathin oxide films and stripes adsorbed on the metallic surface. These structures display unique electronic and structural properties, which have been studied in detail experimentally and theoretically in recent years. In this review, the state of research on low-dimensional surface oxides formed on Rh surfaces will be discussed with a special focus on the contributions derived from computational approaches. Several points elucidating the novel properties of the surface oxides will be addressed: (i) the structural relation between the surface oxides and their bulk counterparts, (ii) the electronic properties of the low-dimensional oxide films and (iii) potential catalytic and electronic applications of the surface oxides.

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Abatement of NO Using Rhodium Catalysts Supported on Carbon Nanotubes: Carbon as Support Material and Reducing Agent

Cited by 17 publications

References 19 publications

Preparation of CuCl@AC with high CO adsorption capacity and selectivity from CO/N2 binary mixture

Preparation of CuCl@AC with high CO adsorption capacity and selectivity from CO/N2 binary mixture

Decomposition of nitrous oxide by rhodium catalysts: Effect of rhodium particle size and metal oxide support

Low-dimensional surface oxides in the oxidation of Rh particles

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