Zeolites grown on wire gauze: A new structured catalyst packing for dustproof, low pressure drop denox processes

Abstract

To prove the applicability of zeolite crystals as a catalyst in dustproof low pressure drop reactors, a novel structured catalyst packing has been developed consisting of ZSM‐5 crystals in situ grown on metal wire gauze. Using this technique, mechanically strong catalyst packings of any required shape can be produced that give an extremely low pressure drop across the packing and that trap almost no dust particles. These features make the packing especially suitable for end‐of‐pipe processes, such as the catalytic removal of NOx from large flows of dust containing flue gas. To demonstrate the feasibility of the packing as a catalyst, it was tested — after incorporation copper into the zeolites by ion exchange — on its activity for Selective Catalytic Reduction of nitric oxide with ammonia at 350°C. Both the activity and selectivity of the catalyst packing proved to be superior to conventional vanadia/titania catalysts.

Synthesis of ZSM-5 coatings on stainless steel grids and their catalytic performance for partial oxidation of benzene by N2O

“…In addition of achieving the same catalytic performance as over zeolites in the traditional fixed-bed (97% selectivity towards phenol formation at benzene conversion of about 11%), these new catalytic packings present several advantages like low pressure drop through the catalytic bed, improved heat and mass transfer, and controlled flow hydrodynamics [1,18]. These zeolitic packings could be applied also for the end-of-pipe DeNOx [2,19] and other oxidation processes avoiding run-away problems.…”

“…This is a valuable alternative to conventional fixed beds and slurry catalytic reactors [1]. The main disadvantages of the traditional zeolite fixed beds could be avoided by the use of structured catalyst packing [2]. These packings are prepared via zeolitic coatings of metal grids.…”

Substrate heating method for coating metal surfaces with high-silica zeolites: ZSM-5 coatings on stainless steel plates

“…They may serve as membranes in separation processes [1,2], as structured catalysts in reactors minimizing the pressure drop and mass transfer limitations [3,4], as sensors [5], and adsorbents in adsorption heat pumps [6]. Zeolite coatings may be prepared by a variety of synthesis procedures, resulting in coatings of different characteristics.…”

Synthesis of structured filamentous zeolite materials via ZSM-5 coatings of glass fibrous supports

“…Structured zeolitic packing can be prepared via a binderless hydrothermal synthesis on metal grids [2][3][4] or ceramics [5]. In our previous publication [4], we tested the ZSM-5 coatings on metal grids for partial oxidation of benzene by N 2 O to phenol.…”