Abstract
As a clean fuel combustion technology, the circulating fluidized bed (CFB) has been developed rapidly in recent years, but one of its disadvantages is high N2O emissions. With the implementation of increasingly strict pollution control standards, N2O decomposition and removal technologies have become the main focus of current research. This paper reviews the latest research on noble metals, metal oxides, the molecular sieve and other new catalysts and decomposition methods for N2O removal. The research methods and functions of catalysts are compared and the existing problems are summarized. The future directions of development in N2O decomposition and removal are considered. Noble metals and the molecular sieve show satisfactory activity at relatively low temperatures, but their catalytic efficiency is obviously hindered by O2, NO and H2O. In addition, high costs and insufficient thermal stability limit their widespread industrial application. The metal oxide catalytic technology, especially oxygen carrier-aided combustion (OCAC), is expected to be the ideal method for N2O removal in CFB boilers due to its stability and economical feasibility.
Highlights
Carbon is a resource with huge reserves in China and is mostly used in direct combustion [1]
The metal cations outside the skeleton are considered to behave the active cen Compared with noble metal catalysts, metal-ion-modified molecular sieves the
The results showed that the content of carbon monoxide in the exhaust gas can be reduced by using an activated bed material in the combustion process when using a sub-stoichiometric air–fuel ratio
Summary
The noble metal is the earliest N2 O catalytic remover and includes Rh, Ru, Pd, Pt, Au, In, etc. [24,25,26]. The noble metal is the earliest N2 O catalytic remover and includes Rh, Ru, Pd, Pt, Au, In, etc. [24,25,26] They are usually supported on porous carrier materials in the form of ions or a single metal [27,28]. Porous materials mainly include Al2 O3 , MgO, SiO2 , TiO2 and ZrO2 [29,30]. The performance of a catalyst is related to the type of active components, and to the type and structure of the support used [31,32,33,34,35]
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