Development of highly selective In 2 O 3 /ZrO 2 catalyst for hydrogenation of CO 2 to methanol: An insight into the cata
- PDF / 976,729 Bytes
- 10 Pages / 595 x 842 pts (A4) Page_size
- 106 Downloads / 170 Views
pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Development of highly selective In2O3/ZrO2 catalyst for hydrogenation of CO2 to methanol: An insight into the catalyst preparation method Munirah Md Zain*, Maedeh Mohammadi**, Naoto Kamiuchi***, and Abdul Rahman Mohamed*,† *Low Carbon Economy (LCE) Research Group, School of Chemical Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia **Faculty of Chemical Engineering, Babol Noshirvani University of Technology, 47148 Babol, Iran ***The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan (Received 9 February 2020 • Revised 4 May 2020 • Accepted 11 May 2020) AbstractThis study explored the potential of In2O3/ZrO2 catalyst for direct CO2 hydrogenation to methanol. Despite the excellent properties proven by density functional theory (DFT) studies, the experimental works on this catalyst are still very limited. In this study, In2O3/ZrO2 catalysts were synthesized via wetness impregnation (In2O3/ZrO2(WI)), citric acid-based sol-gel method (In2O3/ZrO2(SG)) and deposition-precipitation assisted by urea hydrolysis (In2O3/ZrO2(UH)). Results indicated the impressive effect of preparation method on the catalytic activity where In2O3/ZrO2(SG) presented superior catalytic performance, followed by In2O3/ZrO2(UH) and In2O3/ZrO2(WI), with the CO2 conversion of 16.23%, methanol selectivity of 94.39% and STY of 0.95 gmethanol/gcat ·h. To unravel the structure-function relationship, several characterization techniques including XRD, HR-TEM, SEM-EDX, H2-TPR, CO2-TPD, N2 adsorption-desorption isotherm and XPS were implemented to analyze the developed catalysts. The analyses indicated that the excellent performance of In2O3/ZrO2 (SG) was due to its smaller crystallite size, strong metal-support interaction, high reducibility and high concentration of basic sites and oxygen vacancies on the catalyst surface. Time-on-stream stability test showed that In2O3/ZrO2 (SG) catalyst could sustain its high activity and selectivity within 100 h, signifying the high potential of this catalyst for direct hydrogenation of CO2 to methanol with minimum side reactions and deactivation. Keywords: Heterogenous Catalyst, CO2 Hydrogenation, Methanol Synthesis, Reducibility, Basic Sites, Oxygen Vacancies
Eq. (3). All these reactions occur simultaneously in the gas phase and are in chemical equilibrium [3]. However, since the reduction of carbon oxides to methanol (Eqs. (1) and (3)) is exothermic, therefore CO2 hydrogenation to methanol must be conducted at lower temperatures to ensure higher selectivity of methanol as the desired product.
INTRODUCTION Carbon dioxide (CO2) capture, utilization and storage (CCUS) has been proposed as a promising strategy to reduce the emission of CO2 into the atmosphere. The captured CO2 can be utilized as a C1 carbon feedstock for production of valuable fuels and chemicals such as methanol, which can be either utilized as a fuel or a starting material in che
Data Loading...
