The study of modified zirconium catalysts for selective dehydration of propan-2-ol

• Published in: Journal of thermal analysis and calorimetry 2018-03, Vol.131 (3), p.2361-2371
• Main Authors: Khalameida, S., Diyuk, V., Zaderko, A., Sydorchuk, V., Skubiszewska-Zięba, J.
• Format: Article
• Language: English
• Subjects: Adsorption; Ammonia; Analytical Chemistry; Catalysis; Catalysts; Chemistry; Chemistry and Materials Science; Comparative analysis; Dehydration; Desorption; Fourier transforms; Inorganic Chemistry; Measurement Science and Instrumentation; Physical Chemistry; Polymer Sciences; Pore size; Porosity; Pyridine; Zirconium
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-017-6733-2

X-ray amorphous precipitated zirconium hydrophosphate ZrP has been subjected to hydrothermal, microwave and mechanochemical modification. Modified samples have been studied using XRD, FTIR spectroscopy, adsorption–desorption of nitrogen, temperature-programmed desorption of ammonia and pyridine adsorption. They possess higher surface area and more developed and accessible pore structure compared with unmodified ZrP. They also have higher concentration of acid sites. The latter are predominantly represented by weak and strong centers. Modified samples also are more active in the process of propan-2-ol dehydration compared with initial ZrP: The temperature of propan-2-ol total conversion reduces from 295 to 193–199 °C. This temperature depends on total pore volume, pore size and total acidity of ZrP samples. Catalysts possessing mesopores size ≥ 4 nm, total pore volume > 0.4 cm 3  g −1 and total acidity > 0.4 mmol g −1 exhibit maximal activity. The modified ZrP catalysts are not only efficient but also recyclable since can be used at least three times without decline in the catalytic performances.