A pinboard by
Xin Li

PhD Candidate, Missouri University of Science and Technology


This study aims at developing novel structured zeolite monoliths with various compositions by using three dimensional (3D) printing techniques to promote the production of light olefins and catalyst stability in selective transformation of light alcohols. 3D-printed ZSM-5 and silicalite-1 monoliths were coated with a thin layer of SAPO-34 zeolite. Characterization results indicated that the 3D-printed monoliths were highly porous and their micropore surface area and pore volume further increased by consequent coating with SAPO-34 zeolite. The catalytic results showed that the thin layer of SAPO-34 on 3D-printed MFI structures impeded the gaseous mas transport but favored the production of light olefins. The total acidity of SAPO-34/3D-printed ZSM-5 structure was higher than both SAPO-34/3D-printed silica and uncoated 3D-printed ZSM-5 monolith which favored the light olefins production. Coating 3D-printed HZSM-5 monolith with SAPO-34 enhanced the ability to produce olefins while circumvented the quick coke formation. These results demonstrated that selectivity and reaction rate in dehydration of light alcohols to light olefins can be modulated by changes in catalyst topology and morphology.


Formulation of Aminosilica Adsorbents into 3D-Printed Monoliths and Evaluation of their CO2 Capture Performance.

Abstract: Amine-based materials have represented themselves as a promising class of CO2 adsorbents, however their large-scale implementation requires their formulation into suitable structures. In this study, we report formulation of aminosilica adsorbents into monolithic structures through 3D printing technique. In particular, 3D-printed monoliths were fabricated using pre-synthesized silica-supported tetraethylenepentamine (TEPA) and poly(ethylenimine) (PEI) adsorbents using three different approaches. In addition, a 3D-printed bare silica monolith was prepared and post-functionalized with 3-aminopropyltrimethoxysilane (APS). Characterization of the obtained monoliths indicated that aminosilica materials retained their characteristics after being extruded into 3D-printed configurations. Adsorptive performance of amine-based structured adsorbents was also investigated in CO2 capture. Our results indicated that aminosilica materials retain their structural, physical and chemical properties in the monoliths. In addition, the aminisilica monoliths exhibit adsorptive characteristics comparable to their corresponding powders. This work highlights the importance of adsorbents materials formulations into practical contactors such as monoliths, as the scalabale technology platform, that could facilitate rapid deployment of adsorption-based CO2 capture processes on commercial scales.

Pub.: 12 Feb '17, Pinned: 29 Jun '17