Efficient removal of the carbon deposits formed during the mixed methane reforming over Ni/Al2O3

2020 ◽  
Vol 37 (2) ◽  
pp. 209-215
Author(s):  
Oleksandr Shtyka ◽  
Mateusz Zakrzewski ◽  
Radoslaw Ciesielski ◽  
Adam Kedziora ◽  
Sergey Dubkov ◽  
...  
Keyword(s):  
Methane Reforming ◽  
Efficient Removal ◽  
Carbon Deposits

scholarly journals Effect of Ruthenium and Cerium Oxide (IV) Promotors on the Removal of Carbon Deposit Formed during the Mixed Methane Reforming Process

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7581
Author(s):  
Mateusz Zakrzewski ◽  
Oleksandr Shtyka ◽  
Radoslaw Ciesielski ◽  
Adam Kedziora ◽  
Waldemar Maniukiewicz ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Cerium Oxide ◽  
Nickel Catalyst ◽  
Catalytic System ◽  
Bimetallic Catalyst ◽  
Carbon Deposit ◽  
Methane Reforming ◽  
Carbon Deposits ◽  
Carbon Species ◽  
Gasification Of Carbon

This work investigates the effect of the addition of Ru and CeO2 on the process of gasification of carbon deposits formed on the surface of a nickel catalyst during the mixed methane reforming process. Activity studies of the mixed methane reforming process were carried out on (Ru)-Ni/CeO2-Al2O3 catalysts at the temperature of 650–750 °C. The ruthenium-promoted catalyst exhibited the highest activity. Carbonized post-reaction catalyst samples were tested with the TOC technique to investigate the carbonization state of the samples. The bimetallic catalyst had the lowest amount of carbon deposit (1.5%) after reaction at 750 °C. The reactivity of the carbon species was assessed in mixtures of oxygen, hydrogen, carbon dioxide, and water. Regardless of the gasifying agent used, the carbon deposit was removed from the surface of the catalytic system. The overall mechanism of mixed methane reforming over Ru and CeO2 was shown.

Anode Fuel and Steam Recycling for Internal Methane Reforming SOFCs: Analysis of Carbon Deposition

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Valérie Eveloy
Keyword(s):  
Thermal Stresses ◽  
Carbon Deposition ◽  
Mitigation Strategies ◽  
Methane Reforming ◽  
Carbon Deposits ◽  
Cracking Reaction ◽  
Minor Portion ◽  
A Minor ◽  
Operational Range ◽  
Gas Recycling

Anode fuel and steam recycling are explored as possible mitigation strategies against carbon deposition in an internal methane reforming solid oxide fuel cell (IR-SOFC) operated at steam-to-carbon ratios (S:Cs) of 0.5–1. Using a detailed computational fluid dynamics model, the cell behavior and spatial extent of carbon deposits within the anode are analyzed based on a thermodynamic analysis accounting for both the cracking and Boudouard reactions for fuel and steam recycling fractions of up to 90% (mass percent). At temperatures close to 1173 K, 50% fuel recycling is found to be an effective mitigation strategy against carbon deposition, with only a minor portion of the cell inlet affected by coking. Steam recycling reduces the extent of carbon deposits by a magnitude comparable to that obtained using fuel recycling, provided that recycling ratios on the order of 25% higher than that for fuel recycling are applied. Steam recycling could therefore be considered advantageous in terms of reduced overall mass flow. The mitigating effect of fuel recycling on the susceptibility to coking at the cell inlet is found to be through the direction of the cracking reaction, while steam recycling has a positive (but slightly less effective) impact on both the Boudouard and cracking reactions. The results suggest that partial anode gas recycling could help extend the operational range of IR-SOFCs to lower fuel humidification levels than typically considered, with reduced thermal stresses and risks of carbon deposits, while reducing system cost and complexity in terms of steam production.

AN NOVEL UCSB-ANR INTEGRATED SYSTEM FOR EFFICIENT REMOVAL OF ORGANIC MATTER AND AMMONIA NITROGEN FROM SWINE WASTEWATER

2016 ◽  
Vol 15 (10) ◽  
pp. 2261-2266
Author(s):  
Xiaowei Li ◽  
Jie Zhang ◽  
Weiwei Zhao ◽  
Xuewen Yi ◽  
Wei Lin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Ammonia Nitrogen ◽  
Integrated System ◽  
Swine Wastewater ◽  
Efficient Removal

Studying dispersed and rheological properties of hydrocarbon-containing acid emulsions and their efficiency in removing asphalt-resin-paraffin deposits

2020 ◽  
pp. 128-139
Author(s):  
M. Yu. Shumakher ◽  
V. V. Konovalov ◽  
A. P. Melnikov
Keyword(s):  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Rheological Properties ◽  
Reaction Rate ◽  
Experimental Studies ◽  
Efficient Removal ◽  
Reservoir Properties ◽  
Hydrocarbon Solvents ◽  
Formation Zone ◽  
Effect Of The Composition

Currently, the treatment of the bottomhole formation zone with acidic compositions is one of the most common methods to intensify the oil inflow. The use of various modified acid compositions increases the efficiency of acid treatments on the bottomhole formation zone. Acid compositions, including those containing hydrocarbon solvents, which contribute to more efficient removal of organic colmatants, affect the reaction rate of the reagent with the rock and processing equipment, change the reservoir properties, etc.The article presents the results of experimental studies, which are aimed at establishing the effect of the composition of hydrocarbon-containing acidic emulsions consisting of an aqueous solution of hydrochloric acid, toluene and Neonol AF 9-10 on their dispersed and rheological properties, as well as their efficiency in removing paraffin deposits.

scholarly journals Synthesis and evaluation of Ca-doped ferrihydrite as a novel adsorbent for the efficient removal of fluoride

2021 ◽  
Author(s):  
Khalil Ahmad ◽  
Izaz Ali Shah ◽  
Sharafat Ali ◽  
Muhammad Tariq Khan ◽  
Muhammad Bilal Ahmed Qureshi ◽  
...  
Keyword(s):  
Efficient Removal
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