کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
45050 46395 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Bifunctional Cu/H-ZSM-5 zeolite with hierarchical porosity for hydrocarbon abatement under cold-start conditions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Bifunctional Cu/H-ZSM-5 zeolite with hierarchical porosity for hydrocarbon abatement under cold-start conditions
چکیده انگلیسی


• Hierarchical Cu/H-ZSM-5 superior catalytic trap for hydrocarbon abatement.
• Improved hydrocarbon retention achieved following loading with copper.
• The presence of mesoporosity favored higher dispersions of CuO nanoparticles.
• CuO nanoparticles catalyzed the total oxidation of the trapped hydrocarbons.
• This bifunctional solid reduces hydrocarbon emissions under cold-start conditions.

A key target to reduce current hydrocarbon emissions from vehicular exhaust is to improve their abatement under cold-start conditions. Here, we demonstrate the exceptional properties of a hierarchical Cu/H-ZSM-5 zeolite-based system as a catalytic trap. The largely increased external surface area coupled with the preserved intrinsic properties attainable upon alkaline treatment and subsequent acid washing of a conventional ZSM-5 zeolite enable an improved dispersion of copper species in the hierarchical counterpart. The impact of post-synthetic modification on the preparation of copper-containing ZSM-5 is clearly revealed by XRD, N2 sorption, FTIR, NH3-TPD, TEM, SEM, and HAADF-STEM. By providing stronger adsorption sites, the introduction of copper species improves the retention of propene and toluene with respect to the protonic zeolites, and enables their further conversion to carbon dioxide and water rather than their emission in the exhaust. The equivalent adsorption capacity and improved oxidation activity and lower susceptibility to deactivation exhibited by the hierarchical Cu/H-ZSM-5 catalyst vis-a-vis its conventional counterpart yield a superior bifunctional catalyst able of reach full hydrocarbon conversion under realistic operating conditions.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis B: Environmental - Volumes 154–155, July–August 2014, Pages 161–170
نویسندگان
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