scholarly journals Effect of Precious Metals on NO Reduction by CO in Oxidative Conditions

2020 ◽  
Vol 10 (9) ◽  
pp. 3042
Author(s):  
Joudia Akil ◽  
Stéphane Siffert ◽  
Pirault-Roy Laurence ◽  
Damien P. Debecker ◽  
François Devred ◽  
...  
Keyword(s):  
Noble Metals ◽  
No Reduction ◽  
Rapid Development ◽  
Precious Metals ◽  
Value Added ◽  
Pt Nanoparticles ◽  
Bet Surface Area ◽  
Hydrogen Chemisorption ◽  
Heterogeneous Catalytic ◽  
No Reduction By Co

Carbon dioxide has become an environmental challenge, where the emissions have reached higher level than can be handled. In this regard, conversion of CO2 to value-added chemicals and thus recycling of CO2 appear a viable option. Prior to valorization, CO2 must be purified. Among several opportunities, oxyfuel combustion is a process in rapid development. However, the gases resulting from this process contain some traces of impurities that can hinder the recovery of CO2 such as NO and CO. This work has, therefore, focused on the study of the NO-CO reaction in an oxidizing medium, using heterogeneous catalytic materials based on various supported noble metals. These materials were extensively characterized by a variety of methods including Brunauer–Emmett–Teller (BET) surface area measurements, hydrogen chemisorption, transmission electron microscopy (TEM) and H2 temperature programmed reduction (H2-TPR). The results obtained show that the catalytic behavior of M/Al2O3 catalysts in CO oxidation and NO reduction with CO in oxidative conditions depends mainly on the nature of the metal. The best result for both reactions is obtained with Pt/Al2O3 catalyst. The Pt nanoparticles in their metallic form (Pt°) as evidenced by TPR could explain the activity.

scholarly journals Effect of Precious Metals on NO Reduction by CO in Oxidative Conditions

2020 ◽  
Author(s):  
Joudia Akil ◽  
Stephane Siffert ◽  
Pirault-Roy Laurence ◽  
Damien P. Debecker ◽  
François Devred ◽  
...  
Keyword(s):  
Noble Metals ◽  
No Reduction ◽  
Precious Metals ◽  
Value Added ◽  
Pt Nanoparticles ◽  
Bet Surface Area ◽  
Hydrogen Chemisorption ◽  
Global Challenge ◽  
No Reduction By Co ◽  
Temperature Programmed

Carbon dioxide has become a global challenge, where the emissions have become more than what could be handled. In this regard, conversion of CO2 to value added chemicals and thus recycling CO2 became a viable option. One of these options is the use of a process in strong development: oxycombustion. However, the gases resulting from this process contain some traces of impurities that can hinder the recovery of CO2 such as NO and CO. This work has therefore focused on the study of the reaction of NO reduction by CO in an oxidizing medium, using catalytic materials based on various supported noble metals. These materials were extensively characterized by a variety of methods including BET surface area measurements, hydrogen chemisorption, Transmission Electron Microscopy (TEM) and H2 temperature programmed reduction (H2-TPR). The obtained results show that the catalytic behaviour of M/Al2O3 catalysts in CO oxidation and NO reduction with CO in oxidative conditions depends mainly on the nature of the metal. The best result for these both reactions is obtained with Pt/Al2O3 catalyst. The Pt nanoparticles existing in the metallic form (Pt°) showed by TPR could explain the activity.

scholarly journals Identification of single Ru(II) ions on ceria as a highly active catalyst for abatement of NOx pollutants

2021 ◽  
Author(s):  
Konstantin Khivantsev ◽  
Nicholas R. Jaegers ◽  
Hristiyan A. Aleksandrov ◽  
Libor Kovarik ◽  
Inhak Song ◽  
...  
Keyword(s):  
Noble Metals ◽  
No Reduction ◽  
Supported Catalyst ◽  
No Oxidation ◽  
Single Atom ◽  
No Reduction By Co ◽  
Highly Active ◽  
Ceria Support ◽  
Potential Applicability

Atom trapping allows to prepare catalysts with atomically dispersed Ru ions anchored to the ceria support. The resulting catalysts free of expensive noble metals such as Pt, Pd, Rh (whose prices are ~8-60 times higher than Ru on the per-molar basis) with Ru loadings of only 0.25-0.5 wt% show excellent activity in industrially important catalytic NO oxidation reaction, a critical step that requires use of relatively large loadings of expensive noble metals in diesel aftertreatment systems. Ru1/CeO2 catalysts are stable during continuous cycling, ramping and cooling as well as presence of moisture. Furthermore, Ru1/CeO2 shows excellent NOx storage properties during cold start, with improved NO adsorption compared with the best described Pd/Zeolite NO adsorbers with ~2-3 times higher Pd loadings. We clarify the location of Ru(II) ions on the ceria surface and identify mechanism of NO oxidation (as well as reactive storage) using DFT calculations and in-situ DRIFTS/Mass-spectroscopy measurements. Furthermore, we show the possible applications of Ru1/CeO2 in gasoline engines for NO reduction by CO: only 0.1 wt% of atomically dispersed Ru is sufficient to achieve high activity at low temperatures. With the aid of excitation-modulation in-situ infra-red measurements, we uncover the elementary steps of NO reduction by CO on an atomically dispersed ceria-supported catalyst. Our study highlights the potential applicability of single-atom catalysts to industrially relevant NO and CO abatement.

A novel integrated rotary reactor for NO reduction by CO and air preheating: Reactor design and heat transfer modelling

2021 ◽  
Vol 190 ◽  
pp. 116815
Author(s):  
Jianjie Li ◽  
Peiliang Sun ◽  
Xingxing Cheng ◽  
Xiangdong Li ◽  
Xiaotao T. Bi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
No Reduction ◽  
Reactor Design ◽  
No Reduction By Co ◽  
Transfer Modelling ◽  
Rotary Reactor

scholarly journals Electron donation of non-oxide supports boosts O2 activation on nano-platinum catalysts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Gan ◽  
Jingxiu Yang ◽  
David Morris ◽  
Xuefeng Chu ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Nitrogen Vacancy ◽  
Innovative Strategy ◽  
Oxide Supports ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Electron Sink ◽  
Nitrogen Vacancies

AbstractActivation of O2 is a critical step in heterogeneous catalytic oxidation. Here, the concept of increased electron donors induced by nitrogen vacancy is adopted to propose an efficient strategy to develop highly active and stable catalysts for molecular O2 activation. Carbon nitride with nitrogen vacancies is prepared to serve as a support as well as electron sink to construct a synergistic catalyst with Pt nanoparticles. Extensive characterizations combined with the first-principles calculations reveal that nitrogen vacancies with excess electrons could effectively stabilize metallic Pt nanoparticles by strong p-d coupling. The Pt atoms and the dangling carbon atoms surround the vacancy can synergistically donate electrons to the antibonding orbital of the adsorbed O2. This synergistic catalyst shows great enhancement of catalytic performance and durability in toluene oxidation. The introduction of electron-rich non-oxide substrate is an innovative strategy to develop active Pt-based oxidation catalysts, which could be conceivably extended to a variety of metal-based catalysts for catalytic oxidation.

NH3 formation pathways from NO reduction by CO in the presence of water over Rh/Al2O3

2021 ◽  
Vol 286 ◽  
pp. 119893
Author(s):  
Chun-Jae Yoo ◽  
Andrew (Bean) Getsoian ◽  
Aditya Bhan
Keyword(s):  
No Reduction ◽  
No Reduction By Co ◽  
Nh3 Formation

Irradiation regulates the size of Pt nanoparticles on Au@MnO2 nanosheets for electrocatalytic hydrogen evolution

2021 ◽  
Author(s):  
Ting Li ◽  
Yidan Liu ◽  
Rongrong Jia ◽  
Yaseen Muhammad ◽  
Li-Yi Shi ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Noble Metals ◽  
Pt Nanoparticles ◽  
Mno2 Nanosheets

Regulating the size of noble metals over oxide nanosheets have been attracting great attention in the fields of electrochemistry and catalysis. Photodeposition process is green, mild and controllable but limited...

Heterogeneous catalytic CO2 conversion to value-added hydrocarbons

2010 ◽  
Vol 3 (7) ◽  
pp. 884 ◽  
Author(s):  
Robert W. Dorner ◽  
Dennis R. Hardy ◽  
Frederick W. Williams ◽  
Heather D. Willauer
Keyword(s):  
Value Added ◽  
Co2 Conversion ◽  
Heterogeneous Catalytic

Catalytic behaviors of CuO supported on Mn2O3 modified γ-Al2O3 for NO reduction by CO

2010 ◽  
Vol 332 (1-2) ◽  
pp. 32-44 ◽  
Author(s):  
Haiqin Wan ◽  
Dan Li ◽  
Yue Dai ◽  
Yuhai Hu ◽  
Bin Liu ◽  
...  
Keyword(s):  
No Reduction ◽  
No Reduction By Co
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