Investıgatıon On Conversıon Of Ammonıa To Hydrogen In Mıcrowave Focused System In The Presence Of Cobalt, Nıckel And Molybdenum Actıvated Supported Catalysts


Thesis Type: Postgraduate

Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2020

Thesis Language: Turkish

Student: RUKAN CAN SEYFELİ

Supervisor: DİLEK VARIŞLI

Abstract:

In this study, COx-free hydrogen production was investigated by using ammonia decomposition reaction in the microwave reactor system using catalysts containing cobalt, nickel and molybdenum. Two different carbon sources and commercial alumina were used as support materials. By applying the impregnation technique, the synthesis of catalysts with different metal loading was accomplished successfully. Different characterization techniques such as Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES), X-Ray Diffraction Diffractometer (XRD), Nitrogen physorption, Transmission Electron Microscopy (TEM), Raman Spectroscopy were applied to determine the structural properties of the catalysts. Under pure ammonia flow (36000 ml / gk.h GHSVNH3), total ammonia conversion was achieved with carbon and alumina supported cobalt, nickel and molybdenum catalysts at approximately 350-400 ° C using 10W power in the microwave heated system. Due to its characteristics such as providing selective heating and volumetric heating, formation of hot zone, significantly higher conversion values were obtained in the microwave reactor compared to conventional reactor. It has been demonstrated by characterization studies that microwave energy does not affect the structure of the prepared catalysts even in prolonged (96 hours) use.