Abstract
This paper is focused on the recent achievements in the studies of modified layered zeolites and cationic layered clay minerals. These materials are very promising catalysts in green chemistry processes, such as selective catalytic reduction of NOx with ammonia (NH3-SCR) and selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). Special attention is paid to the roles of the micro- and mesoporous structures of the catalytic materials, the type and location of deposited transition metals, as well as surface acidity in the design of effective catalysts for the NH3-SCR and NH3-SCO processes. The majority of the presented analysis is based on the authors’ research.
Highlights
Cationic layered minerals, especially those belonging to the group of phyllosilicates, still have great potential in catalytic applications
Cationic layered clay minerals have been intensively studied as precursors for the synthesis of catalysts for several decades [3,4,11,12,13,14,15]
The surface areas, typically in the range of 150–350 m2 g−1, a developed microporous structure clays modified via this method, called pillared interlayers clays (PILCs), are characterized with a slit-like pore geometry, as well as ion exchange properties and surface acidity
Summary
Especially those belonging to the group of phyllosilicates, still have great potential in catalytic applications. This is not surprising, considering the various ways in which they can be modified, resulting in materials with properties tailored for specific catalytic applications Acid treatment of such layered minerals may cause the partial leaching of clay layer components and delamination of the layer ordering [1]. Considering that clay minerals modified in this way are still characterized by ion exchange properties and surface acidity, it is not surprising that they are very interesting materials [3,4] Layered zeolites are another very interesting group of materials with great potential for catalytic applications [5]. The advances in the studies of layered silica-based catalysts for selective NOx reduction with ammonia and selective ammonia oxidation to nitrogen are presented and discussed in this paper
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