Simple metal hydrides contain hydrogen in their crystal structure. These simple metal hydrides include binary and intermetallic hydrides. Binary hydrides contain only one metal and generally represented as MHx, were M stands for metal. The intermetallic hydrides contain at least two metals in addition to the hydrogen and generally represented by the formula AmBnHx, where A, B are metals. These are further classified in to AB (CsCl structure), AB2 (Laves phase), A2B (AlB2 structure type), AB5 (CuC5 structure type). In these hydrides, metal A has strong affinity for hydrogen and B does not interact with hydrogen.
The binary metal hydride containing high gravimetric storage capacity is alane (AlH3) with 10.1 wt%. Another important simple metal hydride is MgH2. Binary metal hydrides generally have low storage capacity. Among the intermetallic compounds, LaNi5H6 is widely used and commercially available
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These complex metal hydrides have high gravimetric storage capacity than the simple metal hydrides. Nitrogen containing hydrides such as amines or imides, and boron containing hydrides (borohydrides) are the main categories in complex metal hydrides. Lithium imide (Li2NH), magnesium amide (Mg(NH2)2), lithium borohydride (LiBH4) and sodium borohydride (NaBH4) are the actively explored complex metal hydrides for the hydrogen storage applications. Li2NH reversibly store 6.5 wt% of hydrogen however the required temperature to burn the fuel is high and cannot be used in onboard vehicles. In addition, amides and imides produce ammonia as the effluent. The LiBH4 and NaBH4 have a very high gravimetric storage capacity of up to 18 wt%. However, desorption temperature of 673 K is required to remove the hydrogen atoms. Thus these complex metal hydrides are not promising materials for hydrogen storage (Satyapal et al (2007 & Durbin & Malardier-Jugroot
This experiment sought to utilize melting point, boiling point, infrared (IR) spectroscopy, and the index of hydrogen deficiency (IHD) to identify the structures of two unknown compounds. To ensure the successful identification of the unknowns, the molecular formula for each compound was found first. What the molecular formula does is that it allows chemists to identify elements present in a compound as well as the quantity of each element. The issue with this is that there are various compounds that share the same molecular compound yet are different in reactivity and connectivity. To resolve this problem, other measures such as finding functional groups based on IR spectroscopy, determining the boiling or melting point of a compound, and identifying the bond/ring structures using IHD are taken.
Titanium Hydride (TiH2) is a titanium compound used for its strength. TiH2 can be used as a foaming agent for aluminum foam. It can also be used as a component in thermal spray, coating materials, and in different ceramics.
The present global economy is nearly entirely dependent on petroleum and crude oil imports from the Middle East. Where the current situation stands now, oil prices will continue to skyrocket and the environmental impact will continue becoming greater if no form of alternative energy is implemented to a greater extent within the coming years. However, to this effect, the industrial cost of producing such forms of alternative energy is in itself primarily composed of coal and petroleum. In this light, I will investigate the practicality of hydrogen fuel cells based upon hydrogen consumption and exploitation. Hydrogen holds enormous promise for the future regarding alternative energy sources. To this point, its ability to be used in cars, weapons, and as miniature batteries has been demonstrated by many companies. However, if this is the case, hydrogen should be the leading supplier of power around the world. What prevents it from being so?
Heavy metal music has developed greatly ever since it was created in the late 1960’s, evolving into large and varied categories of subgenres. It is not uncommon for types of metal to be confused for one another despite their distinct differences. There are hundreds of subgenres, but three of them will be discussed, the bluesy and distorted doom metal, the fast and fantastical power metal, and the ill reputed black metal.
The methane reformer is a chemical synthesis that turns methane into pure hydrogen, using a catalyst. The hydrogen produced can be applied in numerous areas, such as, hydrogenation of fats and oil, production of ammonia and also in fuel cells (a device that produces electricity by combining hydrogen and oxygen). Platinum is usually used as a catalyst in the methane reformer and plays a vital role in fuel cells. Platinum is a very effective metal because it has the right amount of strength in absorbing: enough so it holds and activates the reactants and not too strong so that the products can’t break away. However, Vincent Artero, a research scientist at Commissariat à l’Énergie Atomique, says, “The problem with platinum is that it’s a very
At ordinary temperatures hydrogen is a colorless, tasteless, and odorless gas, with a density of 0.089 g/liter at 0° C (32° F). It is highly flammable. Like most gaseous elements it is diatomic (its molecules contain two atoms), but it dissociates into free atoms at high temperatures. Hydrogen has a lower boiling point and melting point than any other substance except helium.
Iron comes from the Latin word ferrum. From ferrum its symbol became Fe. The atomic number of iron is 26, and its atomic weight is 55.845. Iron is a magnetic, bendable, shiny white metallic element.
Molybdenum is a transition metal. It is represented by the symbol Mo. It is a pure metal that is is silverish white in color and very hard, and has one of the highest melting points of all pure elements at 4753 °F. Its boiling point is 8382 °F. Its density is 10280 kg/m3 and its hardness is 5.5.
...itrogen? Than Bromine? Why Is Hydrogen so Weird? :. N.p., n.d. Web. 16 Jan. 2014.
The Periodic Table of Elements is commonly used today when studying elements. This table’s history begins in ancient times when Greek scientists first started discovering different elements. Over the years, many different forms of the periodic table have been made which set the basis for the modern table we use today. This table includes over 100 elements and are arranged by groups and periods. Groups being vertical columns and periods being horizontal columns. With all of the research conducted over the years and the organization of this table, it is easy to use when needed.
Sigfusson, Thorsteinn I. "Pathways to Hydrogen as an Energy Carrier." Philosophical Transactions: Mathematical, Physical and Engineering Sciences 365.1853 (2007): 1025-42. Web.
In chemistry, metals compose a great number of the periodic table elements. Each metal has its own characteristic mass,