Hydrogen in transportation

The following section presents the major outcomes of the HyWays project, whose overarching aim was to develop a validated European hydrogen roadmap and an action plan for introducing hydrogen in transport as well as stationary applications, and to demonstrate how hydrogen can contribute to sustainability. HyWays... 

Develop technologies, components and systems for use of hydrogen in transport sector and for energy distributed generation. 

Use of hydrogen in transportation is viewed by many as the real justification of a hydrogen economy. At present, applications are limited to demonstration projects and niche applications, in which cost is a secondary concern. However, if hydrogen vehicles for short-range, low-velocity applications (wheelchairs, bikes, urban buses, and so on) are adopted, practical experience can be obtained and later applied if more extended applications... 

Lan and Tao (2010) showed that a direct use of anunonia (without its preliminary cracking into hydrogen and nitrogen) as a fuel is possible in fuel cells with alkaline anion-exchange membranes. The direct nse of anunonia (which is far more convenient than hydrogen in transportation and handling) would considerably simplify and mitigate the use of PEMFC-Uke power plants in electrical vehicles and different portable devices. 

In the end, the use of hydrogen in transportation applications will depend as much on research and development of production and delivery technologies as any issue associated with hydrogen use onboard the vehicle. 

Tables 2,3, and 4 outline many of the physical and thermodynamic properties ofpara- and normal hydrogen in the sohd, hquid, and gaseous states, respectively. Extensive tabulations of all the thermodynamic and transport properties hsted in these tables from the triple point to 3000 K and at 0.01—100 MPa (1—14,500 psi) are available (5,39). Additional properties, including accommodation coefficients, thermal diffusivity, virial coefficients, index of refraction, Joule-Thorns on coefficients, Prandti numbers, vapor pressures, infrared absorption, and heat transfer and thermal transpiration parameters are also available (5,40). Thermodynamic properties for hydrogen at 300—20,000 K and 10 Pa to 10.4 MPa (lO " -103 atm) (41) and transport properties at 1,000—30,000 K and 0.1—3.0 MPa (1—30 atm) (42) have been compiled. Enthalpy—entropy tabulations for hydrogen over the range 3—100,000 K and 0.001—101.3 MPa (0.01—1000 atm) have been made (43). Many physical properties for the other isotopes of hydrogen (deuterium and tritium) have also been compiled (44).

Nakamura, Takagi and Ueno have also utilized 4 -nitrobenzo-l 5-crown-5 as a starting material Their goal was the formation of a colored crown which could be utilized in transport studies. They have prepared 4 -picrylaminobenzo-l 5-crown-5 for this purpose in the following way. 4 -Nitrobenzo-l 5-crown-5 was hydrogenated and then picryl chloride was added. Nucleophilic aromatic substitution apparently ensued (deep red color) and the product was th n isolated by standard techniques as a yellow solid (mp 155°, max 395 nm) in 72% yield as shown in Eq. (3.17). 

The performance of various solvents can be explained with the help of the role of these solvents in the reaction. These solvents help in keeping teth benzene and hydrogen peroxide in one phase. This helps in the easy transport of both the reactants to the active sites of the catalyst. The acetonitrile, and acetone adsorption data on these catalysts (Fig. 6), suggests that acetonitrile has a greater affinity to the catalytic surface than acetone. There by acetonitrile is more effective in transporting the reactants to the catalyst active sites. At the same time, they also help the products in desorbing and vacating the active sites. 

This terminal point in hydrogen production can be used for refueling hydrogen-powered or hydrogen transport vehicles. There is also an option to canalize hydrogen in a natural gas (NG) pipeline provided that the distance from the WF is fairly short. Flydrogen injection in NG pipelines may improve NG energy properties [45]. 

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