tCopper oxide (CuO) loaded heterogeneous catalysts are a potential candidate to replace the critical pre-cious metals Pt and Pd for the automotive oxidation reaction. However, a good CuO dispersion on thesupports is necessary to compensate for its low intrinsic activity. Moreover, regarding the high operat-ing temperature within the vehicle, a strong metal-support interaction is also required for providing ahigh thermal resistance to the catalyst. In this work, a series of CuO loaded SBA-15 catalysts has beenprepared according to a modified ammonia driven deposition precipitation method (ADP). Herein, theCu/NH3ratio of the synthesis has been varied with the aim to assess its influence on the CuO particlesdispersion and CuO-support interaction. The morphology and porosity of the catalysts, the copper oxidedispersion and the chemical state of CuO were characterized and compared by a combination of tech-niques. In addition to this, the catalysts’ thermal stability and their performance towards the automotiveemission control have also been addressed. Results demonstrated that the ADP method is an efficient andscalable approach to fabricate a copper oxide based catalyst with a distinct automotive oxidation activ-ity. Furthermore, it has been shown that, when a higher Cu/NH3ratio has been applied, a higher copperoxide dispersion degree can be achieved which has a strong metal-support interaction. The latter featureleads to its excellent thermal stability up to 700◦C, accompanied with a prolonged catalytic life-span incomparison with the conventional wet impregnation approach

Preparation of CuO/SBA-15 catalyst by the modified ammonia driven deposition precipitation method with a high thermal stability and an efficient automotive CO and hydrocarbons conversion

Glisenti, Antonella;
2018

Abstract

tCopper oxide (CuO) loaded heterogeneous catalysts are a potential candidate to replace the critical pre-cious metals Pt and Pd for the automotive oxidation reaction. However, a good CuO dispersion on thesupports is necessary to compensate for its low intrinsic activity. Moreover, regarding the high operat-ing temperature within the vehicle, a strong metal-support interaction is also required for providing ahigh thermal resistance to the catalyst. In this work, a series of CuO loaded SBA-15 catalysts has beenprepared according to a modified ammonia driven deposition precipitation method (ADP). Herein, theCu/NH3ratio of the synthesis has been varied with the aim to assess its influence on the CuO particlesdispersion and CuO-support interaction. The morphology and porosity of the catalysts, the copper oxidedispersion and the chemical state of CuO were characterized and compared by a combination of tech-niques. In addition to this, the catalysts’ thermal stability and their performance towards the automotiveemission control have also been addressed. Results demonstrated that the ADP method is an efficient andscalable approach to fabricate a copper oxide based catalyst with a distinct automotive oxidation activ-ity. Furthermore, it has been shown that, when a higher Cu/NH3ratio has been applied, a higher copperoxide dispersion degree can be achieved which has a strong metal-support interaction. The latter featureleads to its excellent thermal stability up to 700◦C, accompanied with a prolonged catalytic life-span incomparison with the conventional wet impregnation approach
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3267230
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