Abstract
A set of novel iron doped cerium‐tungsten catalysts were prepared by sol‐gel method with a view to their application for low temperature selective catalytic reduction (SCR) of NOx with NH3 in power plants. With a molar ratio Fe/W/Ce of 0.5:1:1, a NOx reduction of >90% at 200 °C was achieved. In Fe-W-Ce catalysts with low iron oxide content, it was found that the iron compounds were highly dispersed and formed a solid solution within the cerium oxide lattice, which promoted the SCR activity. Large amounts of iron in the catalysts might form a layer of Fe2O3 on the catalyst surface, which induced the synergistic inhibition effect among Fe, Ce and W species. Moreover, the Fe‐W‐Ce catalysts possessed a high resistance to changed operation parameters as well as to deactivation by SO2 and/or H2O. The novel catalyst showed to be competitive among recently developed low‐temperature SCR catalysts.
Highlights
IntroductionMany different kinds of pollutants can be generated, such as NOx
During combustion processes, many different kinds of pollutants can be generated, such as NOx
This fits with the results shown in the adsorption an obstacle for practical application, since the ratio can be adapted the process adsorption process of NH3 to the catalyst surface is said to limit the reaction progress [36]
Summary
Many different kinds of pollutants can be generated, such as NOx. NOx emissions can have a strong negative impact on the environment and on human health, which result in photochemical smog and acid rain [1] To avoid these damages, several techniques for the abatement of NOx (DeNOx ) have been developed in the past. Vanadium catalysts on titanium support doped with tungsten or molybdenum oxide are commercially used (denoted as V2 O5 -WO3 /TiO2 and V2 O5 -MoO3 /TiO2 , respectively) in a relatively narrow temperature window of 300–400 ◦ C [2,3] This system has some problems, such as the volatility and toxicity of vanadium species, poisoning by K2 O and PbO, low N2 selectivity at high temperatures and high conversion of SO2 to SO3 [4]. It is necessary to develop novel catalysts that operate at lower temperatures [5]
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