Carbon monoxide formation as an intermediate product in photocatalytic steam reforming of methane with lanthanum-doped sodium tantalate

2021 ◽  
Author(s):  
Wirya Sarwana ◽  
Akihiko Anzai ◽  
Daichi Takami ◽  
Akira Yamamoto ◽  
Hisao Yoshida
Keyword(s):  
Carbon Monoxide ◽  
Solar Energy ◽  
Steam Reforming ◽  
Intermediate Product ◽  
Room Temperature ◽  
Carbon Monoxide Formation ◽  
Steam Reforming Of Methane

Photocatalytic steam reforming of methane (PSRM) has been studied as an attractive method to produce hydrogen by utilizing photoenergy like solar energy around room temperature with metal-loaded photocatalysts, where methane...

Thermochemical conversion of solar energy by steam reforming of methane

Energy ◽  
1986 ◽  
Vol 11 (8) ◽  
pp. 805-810 ◽  
Author(s):  
G. De Maria ◽  
C.A. Tiberio ◽  
L. D'Alessio ◽  
M. Piccirilli ◽  
E. Coffari ◽  
...  
Keyword(s):  
Solar Energy ◽  
Steam Reforming ◽  
Thermochemical Conversion ◽  
Steam Reforming Of Methane

Production of Hydrogen With Low Carbon Monoxide Formation Via Catalytic Steam Reforming of Methanol

2006 ◽  
Vol 3 (4) ◽  
pp. 369-374 ◽  
Author(s):  
Sanjay Patel ◽  
K. K. Pant
Keyword(s):  
Carbon Monoxide ◽  
Steam Reforming ◽  
Contact Time ◽  
Methanol Conversion ◽  
Operating Conditions ◽  
Molar Ratio ◽  
Optimum Operating ◽  
Steam Reforming Of Methanol ◽  
Production Of Hydrogen ◽  
Carbon Monoxide Formation

The production of hydrogen was investigated in a fixed bed tubular reactor via steam reforming of methanol (SRM) using CuO∕ZnO∕Al2O3 catalysts prepared by wet impregnation method and characterized by measuring surface area, pore volume, x-ray diffraction patterns, and scanning electron microscopy photographs. The SRM was carried out at atmospheric pressure, temperature 493-573K, steam to methanol molar ratio 1–1.8 and contact-time (W/F) 3–15kg cat./(mol/s of methanol). Effects of reaction temperature, contact-time, steam to methanol molar ratio and zinc content of the catalyst on methanol conversion, selectivity, and product yields was evaluated. The addition of zinc enhanced the methanol conversion and hydrogen production. The excess steam promoted the methanol conversion and suppressed the carbon monoxide formation. Different strategies have been mentioned to minimize the carbon monoxide formation for the steam reforming of methanol to produce polymer electrolyte membrane (PEM) fuel cell grade hydrogen. Optimum operating conditions with appropriate composition of catalyst has been investigated to produce more selective hydrogen with minimum carbon monoxide. The experimental results were fitted well with the kinetic model available in literature.

Production of Hydrogen With Low Carbon Monoxide Formation Via Catalytic Steam Reforming of Methanol

2005 ◽  
Author(s):  
Sanjay Patel ◽  
K. K. Pant
Keyword(s):  
Carbon Monoxide ◽  
Steam Reforming ◽  
Methanol Conversion ◽  
Operating Conditions ◽  
Molar Ratio ◽  
Optimum Operating ◽  
Impregnation Method ◽  
Steam Reforming Of Methanol ◽  
Production Of Hydrogen ◽  
Carbon Monoxide Formation

The production of hydrogen was investigated in a fixed bed tubular reactor via steam reforming of methanol using CuO/ZnO/Al2O3 catalysts prepared by wet impregnation method and characterized by measuring surface area, pore volume, X-ray diffraction pattern and scanning electron microscopy photographs. The SRM was carried out at atmospheric pressure, temperature 493–573 K, steam to methanol molar ratio 1–1.8 and W/F 3 to 15. Effects of reaction temperature, contact-time, steam to methanol molar ratio and zinc content of catalyst on methanol conversion, selectivity and product yields were evaluated. The addition of zinc enhances the methanol conversion and hydrogen production. The excess steam promotes the methanol conversion and suppresses the carbon monoxide formation. Different strategies have been mentioned to minimize the carbon monoxide formation for the steam reforming of methanol to produce fuel cell grade hydrogen. Optimum operating conditions with appropriate composition of catalyst has been found to produce more selective hydrogen with minimum carbon monoxide. The reaction mechanism has been proposed based on the product distribution. The kinetic model available in literature fitted well with the experimental results.

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>

(Ni,Cu)/hexagonal BN nanohybrids – New efficient catalysts for methanol steam reforming and carbon monoxide oxidation

2020 ◽  
Vol 395 ◽  
pp. 125109 ◽  
Author(s):  
Andrey M. Kovalskii ◽  
Andrei T. Matveev ◽  
Zakhar I. Popov ◽  
Ilia N. Volkov ◽  
Ekaterina V. Sukhanova ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Steam Reforming ◽  
Carbon Monoxide Oxidation ◽  
Methanol Steam Reforming

scholarly journals Room-temperature carbon monoxide oxidation by oxygen over Pt/Al2O3 mediated by reactive platinum carbonates

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Mark A. Newton ◽  
Davide Ferri ◽  
Grigory Smolentsev ◽  
Valentina Marchionni ◽  
Maarten Nachtegaal
Keyword(s):  
Carbon Monoxide ◽  
Room Temperature ◽  
Carbon Monoxide Oxidation

scholarly journals Syngas Production from CO2Reforming and CO2-steam Reforming of Methane over Ni/Ce-SBA-15 Catalyst

2017 ◽  
Vol 206 ◽  
pp. 012017
Author(s):  
J S Tan ◽  
H T Danh ◽  
S Singh ◽  
Q D Truong ◽  
H D Setiabudi ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Syngas Production ◽  
Steam Reforming Of Methane
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