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This is sometimes called the reverse water–gas shift reaction. [20] Water gas is defined as a fuel gas consisting mainly of carbon monoxide (CO) and hydrogen (H 2). The term 'shift' in water–gas shift means changing the water gas composition (CO:H 2) ratio. The ratio can be increased by adding CO 2 or reduced by adding steam to the reactor.
The water-gas shift reaction was discovered by Italian physicist Felice Fontana in 1780. Water gas was made in England from 1828 by blowing steam through white-hot coke.
The water gas shift reaction is the reaction between carbon monoxide and steam to form hydrogen and carbon dioxide: CO + H 2 O ⇌ CO 2 + H 2. This reaction was discovered by Felice Fontana and nowadays is adopted in a wide range of industrial applications, such as in the production process of ammonia, hydrocarbons, methanol, hydrogen and other chemicals.
A variety of synthesis-gas compositions can be used. For cobalt-based catalysts the optimal H 2:CO ratio is around 1.8–2.1. Iron-based catalysts can tolerate lower ratios, due to the intrinsic water-gas shift reaction activity of the iron catalyst.
The above reaction is actually the result of two reactions. The first reaction, the reverse water gas shift reaction, is a fast one: CO 2 + H 2 → CO + H 2 O. The second reaction is the rate determining step: CO + H 2 → C + H 2 O. The overall reaction produces 2.3×10 3 joules for every gram of carbon dioxide reacted at 650 °C. Reaction ...
In addition, the reversible gas phase water-gas shift reaction reaches equilibrium very fast at the temperatures in a gasifier. This balances the concentrations of carbon monoxide, steam, carbon dioxide and hydrogen: CO + H 2 O ⇌ CO 2 + H 2.
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In a second stage, additional hydrogen is generated through the lower-temperature, exothermic, water-gas shift reaction, performed at about 360 °C (680 °F): CO + H 2 O → CO 2 + H 2. Essentially, the oxygen (O) atom is stripped from the additional water (steam) to oxidize CO to CO 2. This oxidation also provides energy to maintain the reaction.