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Development of an innovative system for pollution abatement in the new natural gas vehicles

Abstract : The selective catalytic reduction of nitrogen oxides, in lean-conditions, using methane as reductant (NOx CH4-SCR) over PdCe/zeolite-based catalysts was considered in this work. Preparation method for palladium introduction, palladium/cerium loadings and metal introduction order were optimised for a formulation considering MOR zeolite as the catalytic support. The effect of different test conditions, namely [CH4]/[NO] ratio and water presence in the reaction mixture was assessed. The effect of the zeolite support in the stabilisation of Pd/Ce species was also evaluated by preparing a similar PdCe-BEA catalyst to the optimised PdCe-MOR catalyst, considering the same metal loadings and preparation methods. Both catalysts exhibited different metal species and different catalytic performances. Structure-reactivity relationships were drawn from the comparison of several characterisation techniques and catalytic test results for both catalysts. A synergic effect resulting from the use of both catalysts in a single bed application (mixed-bed and dual-bed configuration) is reported. An innovative thermal treatment applied to PdCe-MOR catalyst during its preparation is reported. Under certain conditions, this treatment results in the enhancement of the catalytic performance, namely, in higher NOx conversion into N2 and CH4 selectivity towards NOx SCR. Structured catalysts were prepared by washcoating of PdCe-MOR onto cordierite monoliths with different geometry (cpsi). Preparation parameters were evaluated through characterisation techniques and the catalytic performance was assessed in a synthetic gas bench plant.
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  • HAL Id : tel-01654416, version 1

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Acacio Miguel Nobre Mendes. Development of an innovative system for pollution abatement in the new natural gas vehicles. Chemical and Process Engineering. Université Pierre et Marie Curie - Paris VI; Universidade de Lisboa, 2015. English. ⟨NNT : 2015PA066599⟩. ⟨tel-01654416⟩

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