Optimization of the Technological Parameters for Obtaining Zn-Ti Based Composites to Increase the Performance of H₂S Removal from Syngas

• Main Authors: Annette Madelene Dăncilă, Simona Căprărescu, Constantin Bobiricǎ, Violeta Purcar, Gabriel Gârleanu, Eugeniu Vasile, Cristina Modrogan, Claudia Borda, Dan Dobrotǎ
• Format: Article
• Language: English
• Published: MDPI AG 2020-05-01
• Series: Processes
• Subjects: technological parameters; composites; optimization; syngas; hydrogen sulfide
• Online Access: https://www.mdpi.com/2227-9717/8/5/562
• ISSN: 2227-9717

The realization of some composite materials that allow the best removal of H₂S from syngas was the main objective of this work. Thus, the optimization of the technological parameters for obtaining composites based on Zn-Ti was achieved. The paper studies the influence of calcination temperature on the characteristics of the binary ZnO-TiO₂ system used to synthesize a composite material with suitable properties to be used subsequently for syngas treatment. The mineralogical and structural analyzes showed that starting with the calcination temperature of 700 °C the material synthetized is composed mainly of zinc orthotitanate which possess the corresponding characteristics to be finally used in the treatment of the syngas for its desulfurization. At this calcination temperature the material has a compact structure most likely due to sintering of the formed titanates. These composites have a texture that places them rather in the category of non-porous materials, the pore volume and their surface area obviously decreasing as the calcination temperature increases. A maximum sulfur removal degree of about 97% was obtained by using a composite synthetized at a temperature of 700 °C (ZT-700).