Fly ash-based geopolymers containing added silicate waste. A review

Properties of metakaolin based geopolymer incorporating calcium carbonate

Optimization of powder metallurgy parameters to obtain low corrosion rate and high compressive strength in Al-MoO3 composites using SN ratio and ANOVA analysis

Zeolites have been game-changing materials in oil refining and petrochemistry over the last 60 years and have the potential to play the same role in the emerging processes of the energy and environmental transition. Although zeolites are crystalline inorganic solids, their structures are not perfect and the presence of defect sites – mainly Bronsted acid sites and silanols – influences their thermal and chemical resistance as well as their performances in key areas such as catalysis, gas and liquid separations and ion-exchange. In this paper, we review the type of defects in zeolites and the characterization techniques used for their identification and quantification with the focus on diffraction, spectroscopic and modeling approaches. More specifically, throughout the review, we will focus on silanol (Si–OH) defects located within the micropore structure and/or on the external surface of zeolites. The main approaches applied to engineer and heal defects and their consequences on the properties and applications of zeolites in catalysis and separation processes are highlighted. Finally, the challenges and opportunities of silanol defect engineering in tuning the properties of zeolites to meet the requirements for specific applications are presented.

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Ningxia Fan

Papers

Effect of MoO3 on microstructure and mechanical properties of (Ti,Mo)Al/Al2O3 composites by in situ reactive hot pressing