![]() ![]() Richard Burke is a Prize Fellow in Automotive Powertrain Systems in the Department of Mechanical Engineering at Bath. Valeska Ting is a Lecturer in the Department of Chemical Engineering and the University of Bath's Prize Fellow in Smart Nanomaterials. His project involves the synthesis of new types of zeolites and the development of selective zeolite sensors for automotive exhaust gases. Julien Grand is a Research Engineer in the Laboratoire Catalyse et Spectrochimie (LCS, CNRS), Caen. His project involves the design and application of metal–organic frameworks and zeolites for exhaust gas sensing applications. The size and shape selectivity of the zeolite and MOF materials are controlled by variation of pore dimensions, chemical composition (hydrophilicity/hydrophobicity), crystal size and orientation, thus enabling detection and differentiation between different gases and vapours.ĭominic Wales is a Research Officer in the Department of Chemical Engineering at the University of Bath. Both types of porous material (zeolites and MOFs) reveal great promise for the fabrication of sensors for exhaust gases and vapours due to high selectivity and sensitivity. Examples of the use of zeolites and MOFs in the sensing of water vapour, oxygen, NO x, carbon monoxide and carbon dioxide, hydrocarbons and volatile organic compounds, ammonia, hydrogen sulfide, sulfur dioxide and hydrogen are then detailed. The adsorptive, spectroscopic and electronic techniques for sensing gases using porous materials are summarised. Two broad classes of porous material – zeolites and metal–organic frameworks (MOFs) – are introduced, and their potential for gas sensing is discussed. In this review we survey the current state-of-the-art in using porous materials for sensing the gases relevant to automotive emissions. Gas sensors have a role to play in this process, since they can provide real time feedback to vehicular fuel and emissions management systems as well as reducing the discrepancy between emissions observed in factory tests and ‘real world’ scenarios. Improvements in the efficiency of combustion within a vehicle can lead to reductions in the emission of harmful pollutants and increased fuel efficiency.
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