Industrial Zeolite Molecular Sieves

Abstract

Zeolite molecular sieves are used in industrial applications since more than 60 years, mainly as highly efficient adsorbents for separation processes in gas or liquid phase. Zeolite molecular sieves may be applied in powder form, preferably in static applications, but to a much larger extent as shaped material in both static and dynamic (flowing media) applications. Many shaping technologies for molecular sieves have been developed over the last decades, reflecting the different requirements for molecular sieves in different applications. This review deals with the influence of the applied zeolite synthesis and shaping methods for hydrophilic zeolite molecular sieves (procedures, materials, recipes) on the potential industrial applications; thereby considering powders, binder-containing shapes as well as binderless shapes (including compact structures such as honeycombs, multi-channel, and foam-like structures). Due to new challenges from the market, more specialized, tailor-made types of zeolite molecular sieves are required. Such a higher specialization can be achieved by applying new types of zeolites or zeolite-like materials, modified synthesis and/or post synthesis treatments, and by modified, to the needs of the application adjusted shaping processes.

Gas Porosimetry by Gas Adsorption as an Efficient Tool for the Assessment of the Shaping Effect in Commercial Zeolites

“…Hence, from the differences between both the pore volumes and surfaces between the pure zeolites (powders) and the pelletized samples given in Table 2 , the binder amount can be estimated between 22–24 wt% of the beads for 13X zeolites and to 24–28 wt% in the case of 5A zeolites, respectively. These results are in very good agreement with the literature [ 1 , 2 , 5 ].…”

“…Zeolites are porous materials that have been widely used in industrial applications of adsorption (gas or liquid) and catalysis for more than 60 years [ 1 ]. These materials have the major advantage of superior thermal and mechanical stability.…”

“…However, in dynamic pilot experiments and industrial processes shaped adsorbents are used to limit the pressure drop. These shaped adsorbents are typically obtained by the extrusion of pure powders through the employment of a binder that provides mechanical strength and cohesion of the individual crystals [ 1 , 2 , 3 , 4 , 5 ]. The most common binders used to shape zeolites are clays (kaolin, metakaolin, attapulgite, bentonite), other inorganic compounds (SiO 2 , Al 2 O 3 ), and some organic compounds (carboxymethylcellulose, methylcellulose, lignosulfonate) [ 1 , 4 ].…”

Preparation of Hollow Nanostructures via Various Methods and Their Applications

“…In nature, some inorganic compounds have hollow structures such as zeolites even though the size of the hollow has not in the range of the nano category. However, the utilization of the hollow zeolite structures turned out to be quite a lot, for example, as function as molecular sieves [1], absorbents [1], and selective catalysts [2]. Although the application categories that can be covered come in microns.…”

Síntese e caracterização de material zeolítico de cinzas de carvão granular e avaliação na aplicação como adsorvente

“…de matérias-primas, melhoria das características do produto e benefícios econômicos e ambientais(FEECO, 2018).Uma variedade de elementos é considerada ao determinar qual método de aglomeração deve ser usado. Os fatores contribuintes incluem: capacidade do equipamento, propriedades do agente ligante, padrões da indústria, características desejadas do produto final e características da matéria-prima GLEICHMANN, 2016)…”