Synthesis of Uniform Mesoporous Zeolite ZSM-5 Catalyst for Friedel-Crafts Acylation

ChemEngineering

Abdul-Sattar Nizami¹  Mohammad Rehan¹  HemanA. Smail²  Jabbar Gardy²  KafiaM. Shareef³  Zainab Ramli⁴ 

[1] Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia;Department of Chemistry, College of Science, Salahadin University-Hawler, Erbil 44002, Kurdistan Region, Iraq;Department of Nursing, Ishik University, 100 Meter Campus, Erbil 44001, Kurdistan Region, Iraq;Departments of Chemistry, College of Science, Universiti Technologi Malaysia (UTM), UTM Skudai 81310, Johor, Malaysia;

关键词: ZSM-5;    mesoporous zeolite;    Friedel-Crafts acylation;    modification of ZSM-5;    anisole;   

DOI  :  10.3390/chemengineering3020035

来源: DOAJ

【 摘 要 】

This work highlights how the treatment of ZSM-5 (parent Zeolite Socony Mobil–5, Si/Al = 23) with different surfactant templates and alkaline solution, improved the catalytic performance in the Friedel-Crafts acylation of anisole with a propionic anhydride to obtain p-methoxypropiophenone. The modified microporous to mesoporous zeolite catalysts were characterized using different analytical techniques, including X-ray diffraction (XRD), nitrogen porosimetry, Fourier-transform infrared spectroscopy (FT-IR), temperature-programmed desorption (ammonia-TPD) and field emission scanning electron microscopy (FE-SEM) to analyze the crystallographic structure, surface acidity, surface area, porosity, morphology, and particle size. The results showed that the formed mesoporous zeolite by NaOH solution had smaller mesopores (ca. 3.7 nm) as compared to the mesoporous zeolites obtained by surfactant templates, such as, CTAB (ca. 14.9 nm), TPAOH (ca. 11.1 nm) and mixture of CTAB/TPAOH (ca. 15.2 nm). The catalytic acylation reaction was conducted in a batch glass reactor at various temperatures and the products were analyzed using off-line gas chromatography–mass spectrometry (GC-MS). It was found that the activity of treated ZSM-5 with mixed surfactant templates (CTAB/TPAOH) exhibited enhanced selectivity towards the main product (p-methoxypropiophenone) by a factor 1.7 or higher than unmodified ZSM-5 due to its increased surface area by 1.5 times and enhanced acid sites.

【 授权许可】

Unknown