2021
DOI: 10.3390/catal11101212
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Cu/ZSM5-Geopolymer 3D-Printed Monoliths for the NH3-SCR of NOx

Abstract: Geopolymer-based monoliths manufactured by direct ink writing, containing up to 60% by weight of presynthesized ZSM5 with low Si/Al ratio, were investigated as structured catalysts for the NH3-SCR of NOx. Copper was introduced as the active metal by ion exchange after a preliminary acid treatment of the monoliths. Monolithic catalysts were characterized by morphological (XRD and SEM), textural (BET and pore size distribution), mechanical (compressive strength), chemical (ICP–MS), redox (H2-TPR) and surface (NH… Show more

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Cited by 14 publications
(13 citation statements)
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“…[154] Geopolymers (GPs) which are considered amorphous analogues of zeolites, and known to be inherently macro-/mesoporous, possess high thermal stability and limited degradation of the structural network up to 800 °C have also been utilised. Cepollaro et al [155] prepared geopolymer-based monoliths manufactured by direct ink writing, containing up to 60 % by weight of pre-synthesized ZSM-5, and investigated their performance for NH 3 -SCR-DeNO x . Copper species were introduced as the active metal by ion exchange after preliminary acid treatment of the monoliths, leading to a structure with both macro-/ mesoporous (geopolymer) and microporous (zeolite) phases.…”
Section: Micro-/mesoporous Zsm-5-based Catalystsmentioning
confidence: 99%
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“…[154] Geopolymers (GPs) which are considered amorphous analogues of zeolites, and known to be inherently macro-/mesoporous, possess high thermal stability and limited degradation of the structural network up to 800 °C have also been utilised. Cepollaro et al [155] prepared geopolymer-based monoliths manufactured by direct ink writing, containing up to 60 % by weight of pre-synthesized ZSM-5, and investigated their performance for NH 3 -SCR-DeNO x . Copper species were introduced as the active metal by ion exchange after preliminary acid treatment of the monoliths, leading to a structure with both macro-/ mesoporous (geopolymer) and microporous (zeolite) phases.…”
Section: Micro-/mesoporous Zsm-5-based Catalystsmentioning
confidence: 99%
“…Geopolymers (GPs) which are considered amorphous analogues of zeolites, and known to be inherently macro‐/mesoporous, possess high thermal stability and limited degradation of the structural network up to 800 °C have also been utilised. Cepollaro et al [155] . prepared geopolymer‐based monoliths manufactured by direct ink writing, containing up to 60 % by weight of pre‐synthesized ZSM‐5, and investigated their performance for NH 3 ‐SCR‐DeNO x .…”
Section: Micro‐/mesoporous Zsm‐5‐based Catalystsmentioning
confidence: 99%
“…The first attempts to replicate the same alkaline slurry previously used for the preparation of geopolymer-ZSM-5 structured composites [22,23] were not successful and caused the almost total loss of the original crystalline structure of the SSZ-13 (Figure 1). This was due to the poor resistance of the SSZ-13 structure to the highly alkaline environment required to synthesize a geopolymer matrix.…”
Section: Catalysts Preparationmentioning
confidence: 99%
“…We recently reported [22,23] the preparation and testing in NH 3 -SCR of 3D-printed geopolymer/Cu-ZSM-5 monoliths, possibly providing enhanced performance related to (i) the hierarchical porosity of the composite consisting of a macro-mesoporous (geopoly-mer) matrix and a microporous material (ZSM-5); (ii) improved radial mixing and mass transfer characteristics of 3D-printed monoliths with respect to standard honeycombs; and (iii) higher volumetric loadings of the active phase (zeolite) and good mechanical properties. In this work, following the same approach, we set out to reproduce this methodology for the better-performing zeolite with CHA topology, thus preparing self-standing structured Cu-SSZ-13 catalysts containing a high fraction of zeolite by the Direct Ink Writing method (DIW, an extrusion-based Additive Manufacturing technique).…”
Section: Introductionmentioning
confidence: 99%
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