However, the space velocities and temperatures in the first converter will be higher than the single-stage converter in which it needs to achieve only partial conversion of synthesis gas to methanol. The reaction cell was filled with α6H-SiC granules, pressurized with CO2 gas at 50 psi and distilled water. Although the cost of the silanes is high, it was proved that the NHC-catalyst has the ability to reduce CO2 to methoxides under ambient conditions as mentioned by Zhang et al. During the last decades, electrochemical CO2 conversion has been widely used on a laboratory scale, but it has not yet been successfully used in the industrial processes (large scale). A major problem in using the photoelectrochemical cells is the ability of n-type semiconductor materials to generate holes on the surface that can oxidize the semiconductor itself [85]. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL:, URL:, URL:, URL:, URL:, Membrane reactors for methanol synthesis from forest-derived feedstocks, Data from Methanol Market Services Asia (2014, Cheng and Kung, 1994; Zhang et al., 2003; Zhang and Zhao, 2006, Data from Methanol Market Services Asia, 2014, Noble Metal–Manganese Oxide Hybrid Nanocatalysts, Noble Metal-Metal Oxide Hybrid Nanoparticles, Catalytic activity of manganese complexes towards hydrogenation of, Michael C. Beilke, ... Shelley D. Minteer, in, Alexandra M.F.R. CO2, which is considered as a primary greenhouse-gas (GHG), is periodically exchanged within land surface, ocean, and atmosphere where a variety of creatures, including animals, plants, and microorganisms absorb and produce it daily. Nowadays, as a matter of fact, most of the production companies around the world use methanol as a raw material to produce different products. 5.8 [39]. The obtained results showed that on the surface of pure Ru, Ru modified by Cu and Cd adatoms, and RuOx+IrOx modified by Cu and Cd adatoms, the reduction of CO2 was achieved to produce methanol during 8 h of holding the potential at −0.8 V. Therefore, in case of CO2 reduction on Ru modified by Cu and Cd adatoms, the production of methanol was depended on the presence of adatoms at the surface of ruthenium. Different reduced products can be formed electrochemically from CO2, and some of these products are presented in Table 1. This type of reactor is able to achieve low recycle ratios and high yield. Process (G) has been developed with the finding of the two phase separation of the mixed acid of HI and H2SO4 with the excess of iodine [19]. Carbon Dioxide Conversion to Methanol: Opportunities and Fundamental Challenges, Carbon Dioxide Chemistry, Capture and Oil Recovery, Iyad Karamé, Janah Shaya and Hassan Srour, IntechOpen, DOI: 10.5772/intechopen.74779. The semiconductor (e.g., GaP, SiC) is illuminated by light as the source of energy that is higher than the semiconductor’s band gap. At present, the applications of solar photoelectrochemical devices are very limited due to its high cost and several reasons, as discussed above. Process (H) seems to possess a good thermodynamic characteristics of consisting of reactions with large ΔS for reactions. The ethanol-based biofuel cell undergoing only one-step oxidation with ADH immobilized in a TBAB modified Nafion® membrane has shown open circuit potentials ranging from 0.60 to 0.62 V and an average maximum power density of 1.16±0.05 mW cm−2. Therefore, they mentioned that a pair of competitive reactions which are photo-oxidation and photo-reduction are existed in the photochemical process, as shown in Figure 11. The hydrogen evolution reaction (HER) is very important during CO2 electrocatalyst reduction in which H2O is typically present as an electrolyte (and proton source). studied the two-step oxidation of ethanol to acetate using ADH and AldDH in a novel membrane assembly (MEA) configuration [13, 110]. From the conceptual plant design a thermal efficiency of 45.2% and a product cost of 4.90 dollars/106 Btu was estimated [38]. Therefore, in the future, the electricity needed for electrochemical CO2 reduction process on a large scale can come from different renewable energy sources such as hydro, wind, wave, geothermal, tides, and so on. The Lurgi methanol reactor is a tube-based converter which contains the catalysts in fixed tubes and uses a steam pressure control to achieve the controlled temperature reaction. Catalytic activity of manganese complexes towards hydrogenation of carbon dioxide to methanol [125], one-dimensional tunnel structured manganese oxide catalysts in the oxidative dehydrogenation of ethylbenzene to styrene [126], and transition metals (Ni2+, Cd2+, Fe3+, Co2+, Mg3+) doped into the framework of octahedral molecular sieve materials for oxidative dehydrogenation of ethanol to acetaldehyde [108] have been examined. In contrast, the open circuit potential and the maximum power density for the ethanol-based biofuel cell employing a mixture of both ADH and AldDH immobilized in a TBAB/Nafion® membrane were 0.82 V and 2.04 mW cm−2 respectively. The oxidation of CH3OH to CO2 is catalyzed by NAD+-dependent alcohol- (ADH), aldehyde- (AldDH), and formate- (FDH) dehydrogenases. The process efficiency seems to depend strongly on the efficiency of the mixed acid separation and the concentration of the mixed acid.

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