SciELO - Scientific Electronic Library Online

 
vol.22 issue6In vitro Evaluation of PHBV/PCL Blends for Bone Tissue EngineeringThermal Conductivity and Mechanical Properties of As-Cast and As-Extruded Mg-Zn-Mn Alloys author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Materials Research

Print version ISSN 1516-1439On-line version ISSN 1980-5373

Abstract

VIEIRA, Leo et al. Development of Geopolymers for Catalyst Support Applications. Mat. Res. [online]. 2019, vol.22, n.6, e20180770.  Epub Nov 25, 2019. ISSN 1516-1439.  https://doi.org/10.1590/1980-5373-mr-2018-0770.

A geopolymer with high specific surface area was synthesized from metakaolin, amorphous silica and KOH, in the absence of foaming or saponification agents. The mixture modelling technique was selected for this study among the Design of Experiments tools, using surface area and total pores volume as response variables. The Si/K = 2.46 and Si/Al = 1.37 ratios lead to the optimal experimental conditions, allowing the formation of a geopolymer having a specific surface area of 75 m2/g and total pores volume of 0.28 cm3/g. The pores had a bimodal pore size distribution (7 and 20 nm). In spite of its amorphous nature, this structure is similar to zeolites in terms of ion exchange and metal ions accommodation. Therefore, this study envisages its application as a catalyst support.

Keywords : Geopolymers; catalyst support; metakaolin; design of experiments.

        · text in English     · English ( pdf )