Production of High-Purity Hydrogen and Carbon Dioxide Capture by Sorption Enhanced WGS Reaction Process

2014 ◽  
Vol 906 ◽  
pp. 118-124
Author(s):  
Cheng Tung Chou ◽  
Yu Jie Huang ◽  
Hong Sung Yang
Keyword(s):  
Carbon Dioxide ◽  
High Purity ◽  
Electrical Power ◽  
Method Of Lines ◽  
Spline Approximation ◽  
Reaction Rates ◽  
Operating Conditions ◽  
Reaction Process ◽  
Wgs Reaction ◽  
High Purity Hydrogen

Global warming has become more and more serious, which is caused by greenhouse gases. Cutting down the emission of CO2 has already become one of the major research target in the world. This study is numerically investigating Thermal Swing Sorption Enhanced Reaction Process on water gas shift (WGS) reaction by Na2O-promoted alumina. According to Le Chateliers law, the forward reaction rates and conversion can be increased by removing some products selected. Therefore, this concept can be used to generate product of high-purity hydrogen. The purified H2 can be sent to gas turbine for generating electrical power or can be used for other energy source. Carbon dioxide can also be recovered and sequestrated to reduce greenhouse gas effects. The method of lines is utilized in simulation, combined with upwind differences, cubic spline approximation and LSODE of ODEPACK software to solve the problem. The concentration, temperature, and adsorption quantity in the bed are integrated with respect to time by LSODE of ODEPACK software. The simulation is stopped when the system reaches a cyclic steady state. In this study, we first simulate breakthrough curve of Na2O-promoted alumina cited from literatures to prove the accuracy of simulation program. The optimal operating conditions of the WGS TSA (temperature swing adsorption) single-bed six-process is obtained by varying operating variables, such as feed time and rinse time. Furthermore, WGS TSA single-bed six-process could achieve 99.89% purity of H2 (dry-basis) as the top product and 90.95% purity and 98.22% recovery of CO2 (dry-basis) as the bottom product.

Novel process and catalytic materials for converting CO2 and H2 containing mixtures to liquid fuels and chemicals

2015 ◽  
Vol 183 ◽  
pp. 197-215 ◽  
Author(s):  
Nora Meiri ◽  
Yakov Dinburg ◽  
Meital Amoyal ◽  
Viatcheslav Koukouliev ◽  
Roxana Vidruk Nehemya ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
High Performance ◽  
Reaction Rates ◽  
Operating Conditions ◽  
Reactor System ◽  
Liquid Fuels ◽  
High Productivity ◽  
Carbide Phases ◽  
Production Of Hydrogen ◽  
Higher Hydrocarbons

Carbon dioxide and water are renewable and the most abundant feedstocks for the production of chemicals and fungible fuels. However, the current technologies for production of hydrogen from water are not competitive. Therefore, reacting carbon dioxide with hydrogen is not economically viable in the near future. Other alternatives include natural gas, biogas or biomass for the production of carbon dioxide, hydrogen and carbon monoxide mixtures that react to yield chemicals and fungible fuels. The latter process requires a high performance catalyst that enhances the reverse water-gas-shift (RWGS) reaction and Fischer–Tropsch synthesis (FTS) to higher hydrocarbons combined with an optimal reactor system. Important aspects of a novel catalyst, based on a Fe spinel and three-reactor system developed for this purpose published in our recent paper and patent, were investigated in this study. Potassium was found to be a key promoter that improves the reaction rates of the RWGS and FTS and increases the selectivity of higher hydrocarbons while producing mostly olefins. It changed the texture of the catalyst, stabilized the Fe–Al–O spinel, thus preventing decomposition into Fe3O4 and Al2O3. Potassium also increased the content of Fe5C2 while shifting Fe in the oxide and carbide phases to a more reduced state. In addition, it increased the relative exposure of carbide iron on the catalysts surface, the CO2 adsorption and the adsorption strength. A detailed kinetic model of the RWGS, FTS and methanation reactions was developed for the Fe spinel catalyst based on extensive experimental data measured over a range of operating conditions. Significant oligomerization activity of the catalyst was found. Testing the pelletized catalyst with CO2, CO and H2 mixtures over a range of operating conditions demonstrated its high productivity to higher hydrocarbons. The composition of the liquid (C5+) was found to be a function of the potassium content and the composition of the feedstock.

scholarly journals Co-production of pure hydrogen, carbon dioxide and nitrogen in a 10 kW fixed-bed chemical looping system

2020 ◽  
Vol 4 (3) ◽  
pp. 1417-1426 ◽  
Author(s):  
Sebastian Bock ◽  
Robert Zacharias ◽  
Viktor Hacker
Keyword(s):  
Carbon Dioxide ◽  
High Purity ◽  
Fixed Bed ◽  
Pure Hydrogen ◽  
Chemical Looping ◽  
System P ◽  
Pure Carbon ◽  
Pure Carbon Dioxide ◽  
High Purity Hydrogen

Fixed-bed chemical looping for the generation of high purity hydrogen with sequestration of pure carbon dioxide and nitrogen.

Assessing the effect of light intensity and light wavelength spectra on the photoreduction of formic acid using a graphene oxide material

2020 ◽  
Vol 18 (8) ◽  
Author(s):  
Luis A. Ramos-Huerta ◽  
Lotte Laureys ◽  
Alexis G. Llanos ◽  
Patricio J. Valadés ◽  
Richard S. Ruiz ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Graphene Oxide ◽  
Light Intensity ◽  
Formic Acid ◽  
Reaction Rates ◽  
Operating Conditions ◽  
Initial Reaction ◽  
Oxide Material ◽  
Methanol Production ◽  
Effect Of Light

AbstractPhotocatalysis has been a topic of interest in recent years for both, oxidation and reduction reactions, and although there is a broad variety of research regarding photocatalytic materials and the reaction itself, studies on reactor design and related phenomena, radiation transfer and its direct impact on reaction extent specifically, are usually neglected. From this end, the present work focuses on the elucidation of the effect of light intensity and wavelength spectra in the visible light region during the photoreduction reaction of formic acid using graphene oxide as a promising catalyst. By using formic acid, one of the main intermediaries in the photoreduction of carbon dioxide, the possibility of methanol production is evaluated without the thermodynamic constraints presented by carbon dioxide. A graphene oxide material, synthetized through a modified Hummer’s method, is assessed for the reduction of formic acid evaluating four different light sources (red, green, blue and white). An analysis of energy balances in the reaction set-up allows the determination of both the energy absorbed by the GO photocatalyst and isoactinity conditions at studied radiative operating conditions. At an isoactinity environment, the adsorption rate of formic acid and production rate of methanol are then evaluated, relating them to the absorbed energy achieved at the wavelength spectra and light intensities evaluated; IR spectroscopy is utilized to follow formic acid concentration as well as methanol production. The largest initial reaction rate (ca. 57%) relates to the use of the red wavelength at its largest intensity. Reaction rates at larger times start to be apparent being affected by adsorption, reaction and radiation conditions. The maximum conversion, 14%, is attained by using the white wavelength spectra at its lowest intensity. Thus, higher intensities will not necessarily yield higher conversions, nor the highest reaction rates. This, in turn, poses the necessity of quick, reliable assessments for whichever catalyst used in this type of reactions that leads to the correct election of operating conditions that maximize the product yield. Independent evaluation for every wavelength within the visible spectra and assessing carbon dioxide photoreduction are future steps into the elucidation of solar fuel production feasibility.

Performance of a Pd/PSS membrane reactor to produce high purity hydrogen via WGS reaction

2012 ◽  
Vol 193 (1) ◽  
pp. 87-94 ◽  
Author(s):  
S. Liguori ◽  
P. Pinacci ◽  
P.K. Seelam ◽  
R. Keiski ◽  
F. Drago ◽  
...  
Keyword(s):  
High Purity ◽  
Membrane Reactor ◽  
Wgs Reaction ◽  
High Purity Hydrogen

scholarly journals High Purity Hydrogen Production with In-Situ Carbon Dioxide and Sulfur Capture in a Single Stage Reactor

2011 ◽  
Author(s):  
Nihar Phalak ◽  
Shwetha Ramkumar ◽  
Daniel Connell ◽  
Zhenchao Sun ◽  
Fu-Chen Yu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Production ◽  
High Purity ◽  
Single Stage ◽  
High Purity Hydrogen ◽  
Sulfur Capture

Evaluation of Electric Load Following Capability on Fuel Cell System Fueled by High-Purity Hydrogen

2011 ◽  
Vol 131 (12) ◽  
pp. 927-935
Author(s):  
Yusuke Doi ◽  
Deaheum Park ◽  
Masayoshi Ishida ◽  
Akitoshi Fujisawa ◽  
Shinichi Miura
Keyword(s):  
Fuel Cell ◽  
High Purity ◽  
Cell System ◽  
Electric Load ◽  
Fuel Cell System ◽  
Load Following ◽  
High Purity Hydrogen

A Strategy for Preparing High-efficiency and Economical Catalytic Electrodes toward Overall Water Splitting

Nanoscale ◽  
2021 ◽  
Author(s):  
Dongxue Yao ◽  
Lingling Gu ◽  
Bin Zuo ◽  
Shuo Weng ◽  
Shengwei Deng ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Production Technology ◽  
High Purity ◽  
High Efficiency ◽  
Energy Development ◽  
Overall Water Splitting ◽  
Important Field ◽  
High Purity Hydrogen

The technology of electrolyzing water to prepare high-purity hydrogen is an important field in today's energy development. However, how to prepare efficient, stable, and inexpensive hydrogen production technology from electrolyzed...

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