Selective Methane Oxidation to Methanol on ZnO/Cu2O/Cu(111) Catalysts: Multiple Site-Dependent Behaviors

2021 ◽  
Author(s):  
Erwei Huang ◽  
Ivan Orozco ◽  
Pedro J. Ramírez ◽  
Zongyuan Liu ◽  
Feng Zhang ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Multiple Site

Methane Oxidation on a Coverage Layer Study

2008 ◽  
Author(s):  
Juliana L. Rose ◽  
Pedro Paulo F. Gouvêa ◽  
Cláudio F. Mahler
Keyword(s):  
Methane Oxidation

An assessment of multiple site damage through a simple statistical model

1999 ◽  
Author(s):  
Andrea Pieracci ◽  
Giovanni Mengali
Keyword(s):  
Statistical Model ◽  
Multiple Site ◽  
Multiple Site Damage

Ultra-Low Amounts of Palladium (0.005-0.05 Wt% Pd) Supported on Titania: Remarkable Low-Temperature Activity for NO Reduction with CO and Structure-Function Property Relationships in Methane Oxidation

2020 ◽  
Author(s):  
Konstantin Khivantsev ◽  
Libor Kovarik ◽  
Nicholas R. Jaegers ◽  
János Szanyi ◽  
Yong Wang
Keyword(s):  
Nitric Oxide ◽  
Carbon Monoxide ◽  
Methane Oxidation ◽  
Steam Reforming ◽  
Methane Steam Reforming ◽  
Oxide Reduction ◽  
Water Steam ◽  
Methane Steam ◽  
Anatase Titania ◽  
Nitric Oxide Reduction

<p>Atomically dispersed Pd +2 cations with ultra-dilute loading of palladium (0.005-0.05 wt%) were anchored on anatase titania and characterized with FTIR, microscopy and catalytic tests. CO infrared adsorption produces a sharp, narrow mono-carbonyl Pd(II)-CO band at ~2,130 cm<sup>-1</sup> indicating formation of highly uniform and stable Pd+2 ions on anatase titania. The 0.05 wt% Pd/TiO<sub>2</sub> sample was evaluated for methane combustion under dry and wet (industrially relevant) conditions in the presence and absence of carbon monoxide. Notably, we find the isolated palladium atoms respond dynamically upon oxygen concentration modulation (switching-on and switching off). When oxygen is removed from the wet methane stream, palladium ions are reduced to metallic state by methane and catalyze methane steam reforming instead of complete methane oxidation. Re-admission of oxygen restores Pd<sup>+2</sup> cations and switches off methane steam reforming activity. Moreover, 0.05 wt% Pd/TiO<sub>2</sub> is a competent CO oxidation catalyst in the presence of water steam with 90% CO conversion and TOF ~ 4,000 hr<sup>-1</sup> at 260 ⁰C. </p><p>More importantly, we find that diluting 0.05 wt% Pd/titania sample with titania to ultra-low 0.005 wt% palladium loading produces a remarkably active material for nitric oxide reduction with carbon monoxide under industrially relevant conditions with >90% conversion of nitric oxide at 180 ⁰C (~460 ppm NO and 150 L/g*hr flow rate in the presence of >2% water steam) and TOF ~6,000 hr<sup>-1</sup>. Pd thus outperforms state-of-the-art rhodium containing catalysts with (15-20 times higher rhodium loading; rhodium is ~ 3 times more expensive than palladium). Furthermore, palladium catalysts are more selective towards nitrogen and produce significantly less ammonia relative to the more traditional rhodium catalysts due to lower Pd amount nd lower water-gas-shift activity. Our study is the first example of utilizing ultra-low (0.05 wt% and less) noble metal (Pd) amounts to produce heterogeneous catalysts with extraordinary activity for nitric oxide reduction. This opens up a pathway to study other Pd, Pt and Rh containing materials with ultra-low loadings of expensive noble metals dispersed on titania or titania-coated oxides for industrially relevant nitric oxide abatement.</p>

Methane Oxidation Prediction Curves of Soil at Different Organic Contents

2016 ◽  
Vol 3 (2) ◽  
pp. 131-143 ◽  
Author(s):  
Dinesh Pokhrel ◽  
J.P.A. Hettiaratchi ◽  
Matthew Steele
Keyword(s):  
Methane Oxidation

Innovations in Measuring Field Scale Biological Methane Oxidation at Two Soil-Covered Closed Landfills

2016 ◽  
Vol 3 (2) ◽  
pp. 118-130
Author(s):  
Tarek Abichou ◽  
Haykel Melaouhia ◽  
Bentley Higgs ◽  
Jeff Chanton ◽  
Roger Green
Keyword(s):  
Methane Oxidation ◽  
Field Scale ◽  
Measuring Field

Improved methane oxidation activity of P-doped γ-Al2O3 supported palladium catalysts by tailoring the oxygen mobility and electronic properties

2019 ◽  
Vol 44 (51) ◽  
pp. 27772-27783 ◽  
Author(s):  
Xiaohua Chen ◽  
Yong Zheng ◽  
Yelin Chen ◽  
Yalan Xu ◽  
Fulan Zhong ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Methane Oxidation ◽  
Palladium Catalysts ◽  
Oxygen Mobility ◽  
Oxidation Activity ◽  
Supported Palladium Catalysts ◽  
Supported Palladium
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