Abstract
The QDB-5 sulfur tolerant CO shift catalyst, with anti-methanation property by supported compositing alkali promoters, has been proved to effectively reduce the outlet methane content in the condition of a low water gas ratio. Thus, a new technology based on a lower water/gas ratio than before has been developed with the new catalyst. The CO conversion at lower temperatures and catalyst stability were confirmed by long term industrial application. The high temperature catalyst performance also showed a better result than the conventional commercial catalyst, with higher CO conversion and well controlled methane outlet. Our research and the industrial application of catalyst have shown the importance of alkali metals as core promoters for such kind of catalysts.
Highlights
Along with the recent developments of coal chemistry in China, new types of coal gasification technology have been continuously introduced into the Chinese market
The Chinese own branded QDB-4 catalyst and the newly developed QDB-5 which have been soon applied in the industry, combined with the optimized “low water gas ratio” technology, have been proved to have overcome the current methanation problem of water-gas-shift system with effectively reduced water usage and a desired better control on the catalyst bed temperature
The success of QDB catalysts and packed low water gas ratio technology are built on the innovations in an improved water molecule affinity achieved by the QDB catalysts, by which the catalytic centers better adsorb water in the reaction and enable a more efficient conversion of CO, the water usage is reduced with limited chances for methanation to happen
Summary
Along with the recent developments of coal chemistry in China, new types of coal gasification technology have been continuously introduced into the Chinese market. A water-gas-shift catalytic process, in which the CO content can be catalytically converted with the system added water steam, is employed to further adjust the CO/H2 of syngas before the downstream productions. The Chinese own branded QDB-4 catalyst and the newly developed QDB-5 which have been soon applied in the industry, combined with the optimized “low water gas ratio” technology (such process requires only a less than 1 water/dry gas ratio, which is much lower than the traditional figure of 2 or higher), have been proved to have overcome the current methanation problem of water-gas-shift system with effectively reduced water usage and a desired better control on the catalyst bed temperature. The success of QDB catalysts and packed low water gas ratio technology are built on the innovations in an improved water molecule affinity achieved by the QDB catalysts, by which the catalytic centers better adsorb water in the reaction and enable a more efficient conversion of CO, the water usage is reduced with limited chances for methanation to happen (here CO is converted with water in a priority rather than going into the methanation pathway)
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