Chemical-looping steam reforming process

Chemical-looping modifications of these processes open novel possibilities to address some of the main concerns associated with each of these processes as discussed below. The earliest CLR studies simply explored integration of CLC with a conventional reforming process [78,91-93]. For example, Ryden et al. [78] integrated the cran-bustion of the pressure-swing off-gas of a conventional SRM process to serve as the fuel for a CLC reducer reactor. This allows the capture of any carbon that was not cmiverted to CO in the reforming process itself via CO2 capture in the CLC step while providing some of the heat necessary for the endothermic reaction in the steam reformer. 

The selectivity of catalyst is not involved in synthesis loop of ammonia. Therefore, the influence of catalyst selectivity upon the process of ammonia production mainly takes place in the working procedure such as steam reforming etc. In the catalytic conversion of organic compounds, some raw materials transform more or less to by-products. The yield of purpose product is influenced by the catalyst selectivity to a great degree. For example, the decisive factor of the economy of oxidation process is just the catalyst selectivity. As a result, for this kind of chemical process, the catalyst selectivity has great economic significance than its activity. 

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