Optimal Simultaneous Production of Hydrogen and Liquid Fuels from Glycerol: Integrating the Use of Biodiesel Byproducts

2014 ◽  
Vol 53 (18) ◽  
pp. 7730-7745 ◽  
Author(s):  
Mariano Martín ◽  
Ignacio E. Grossmann
Keyword(s):  
Liquid Fuels ◽  
Simultaneous Production ◽  
Production Of Hydrogen

Process Analysis for the Production of Hydrogen and Liquid Fuels from Oil Shale

2017 ◽  
Vol 5 (11) ◽  
pp. 1963-1978 ◽  
Author(s):  
Mohammad Afzal Raja ◽  
Hao Chen ◽  
Hongyan Wang ◽  
Yongsheng Zhao ◽  
Chunyan Shi ◽  
...  
Keyword(s):  
Oil Shale ◽  
Process Analysis ◽  
Liquid Fuels ◽  
Production Of Hydrogen

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.

Anaerobic Photocatalytic Oxidation of Carbohydrates in Aqueous Pt/TiO2 Suspensions with Simultaneous Production of Hydrogen

2010 ◽  
Vol 13 (1) ◽  
Author(s):  
Dimitris I. Kondarides ◽  
Alexia Patsoura ◽  
Xenophon E. Verykios
Keyword(s):  
Photocatalytic Degradation ◽  
Photocatalytic Oxidation ◽  
Solar Light ◽  
Complete Oxidation ◽  
Simultaneous Production ◽  
Tio2 Catalyst ◽  
Production Of Hydrogen

AbstractThe photocatalytic degradation of a variety of carbohydrates in solution, including mono-, di-, and poly-saccharides, has been investigated under unaerated conditions with the use of a Pt/TiO2 catalyst and a solar light simulating source. It has been found that, even in the absence of oxygen, complete oxidation of carbohydrates toward CO

Enzymatic Determination of Total Serum Cholesterol

1974 ◽  
Vol 20 (4) ◽  
pp. 470-475 ◽  
Author(s):  
Charles C Allain ◽  
Lucy S Poon ◽  
Cicely S G Chan ◽  
W Richmond ◽  
Paul C Fu
Keyword(s):  
Serum Cholesterol ◽  
Free Cholesterol ◽  
Cholesterol Oxidase ◽  
Total Serum ◽  
Total Serum Cholesterol ◽  
Enzymatic Method ◽  
Simultaneous Production ◽  
Enzymatic Determination ◽  
Production Of Hydrogen

Abstract An enzymatic method is described for determination of total serum cholesterol by use of a single aqueous reagent. The method requires no prior treatment of sample and the calibration curve is linear to 600 mg/dl. Cholesterol esters are hydrolyzed to free cholesterol by cholesterol ester hydrolase (EC 3.1.1.13). The free cholesterol produced is oxidized by cholesterol oxidase to cholest-4-en-3-one with the simultaneous production of hydrogen peroxide, which oxidatively couples with 4-aminoantipyrine and phenol in the presence of peroxidase to yield a chromogen with maximum absorption at 500 nm. The method is reproducible, and the results correlate well with those obtained by automated Liebermann—Burchard procedures (AA-2 and SMA 12/60) and the method of Abell et al. The present method affords better specificity than those previously reported and has excellent precision.

Simultaneous production of hydrogen and carbon nanotubes from biogas: On the effect of Ce addition to CoMo/MgO catalyst

2021 ◽  
Author(s):  
Thunyathon Kludpantanapan ◽  
Paveenuch Nantapong ◽  
Raminda Rattanaamonkulchai ◽  
Atthapon Srifa ◽  
Wanida Koo-Amornpattana ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Simultaneous Production ◽  
Production Of Hydrogen
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