Comparative Catalytic Evaluation of Nano-ZrOx Promoted Manganese Catalysts: Kinetic Study and the Effect of Dopant on the Aerobic Oxidation of Secondary Alcohols. (31st May 2017)

• Record Type: Journal Article
• Authors: Assal, Mohamed E.; Kuniyil, Mufsir; Khan, Mujeeb; Shaik, Mohammed Rafi; Al-Warthan, Abdulrahman; Siddiqui, Mohammed Rafiq H.; Labis, Joselito P.; Adil, Syed Farooq
• Other Names: Bechelany Mikhael Academic Editor.
• Is Part Of: Advances in materials science and engineering. Volume 2017(2017)
• Publication Date: 2017-05-31
• Subjects: Materials science -- Periodicals; Materials science; Periodicals; 620.11
• DOI: 10.1155/2017/3958319
• Languages: English
• ISSNs: 1687-8434

Abstract

Abstract : This work reports the zirconia (ZrO x ) nanoparticles doped MnCO3 catalysts prepared by facile and simple coprecipitation technique and the synthesis of zirconia-manganese carbonate [ X % ZrO x –MnCO3 ] (where X % = 0–7%) catalyst which upon calcination at 400°C is converted to zirconia-manganese dioxide [1% ZrO x –MnO2 ] and when calcined at 500°C is converted to zirconia-manganic trioxide [1% ZrO x –Mn2 O3 ]. A comparative catalytic study was performed to investigate the catalytic efficiency between carbonate and oxides for the selective oxidation of 1-phenylethanol by using molecular O2 as a clean oxidant. The influence of several parameters such as w/w% of ZrO x, reaction time, calcination temperature, catalyst amount, and reaction temperature has been thoroughly examined using oxidation of 1-phenylethanol as a model substrate. The 1% ZrO x –MnCO3 precalcined at 300°C exhibited the best catalytic efficiency. It was found that ZrO x nanoparticles also play an essential role in enhancing the effectiveness of the catalytic system for the aerobic oxidation of alcohols. Furthermore, the physical and chemical properties of synthesized catalysts were evaluated by microscopic and spectroscopic techniques. An extremely high specific activity of 40 mmol·g −1 ·h −1 with a 100% conversion of oxidation product and selectivity of >99% was achieved within extremely short reaction time (6 min).