Open AccessHydrogenation of CO2 to methanol using Cu-based catalyst supported on oxide pellets
Author(s) -
Nor Hafizah Berahim,
Akbar Abu Seman,
Nor Hafizah Yasin,
N S Abd Halim,
Noor Asmawati Mohd Zabidi
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1195/1/012009
Subject(s) - catalysis , methanol , space velocity , pellets , chemisorption , syngas , materials science , oxide , desorption , nuclear chemistry , adsorption , chemical engineering , inorganic chemistry , chemistry , metallurgy , selectivity , composite material , organic chemistry , engineering
Hydrogenation of CO 2 into methanol is one of the most economical process to reduce CO 2 concentration in the atmosphere. Since methanol is an industrial commodity used in chemical products as well as transportation fuel, this process has gained considerable interest, which enables the effective utilization of CO 2 . Nevertheless, the efficiency of direct CO 2 hydrogenation to produce methanol is strongly reliant on the activity of the catalyst. In this regard, the present work highlights the synthesis of methanol, catalytic evaluation and characterization of catalysts Cu/ZnO supported on Al 2 O 3 and SBA-15 pellets with the addition of group IV, V and VII metal oxides mixture as promoters. The catalysts were systematically prepared via impregnation technique with fixed Cu:Zn and promoter ratio from group VII:V:IV. The synthesized catalysts were characterized by H 2 -temperature-programmed reduction (H 2 -TPR), field emission scanning electron microscopy (FESEM), X-ray fluorescence (XRF), N 2 adsorption-desorption and N 2 O pulse chemisorption method. The crushing strength of the pellets were also tested. Catalytic performances were evaluated for methanol synthesis from CO 2 hydrogenation in a tubular, stainless steel fixed-bed reactor at 250 °C, 2 MPa, gas hourly space velocity (GHSV) 4000 ml/g.h and H 2 /CO 2 ratio of 3:1. The tri-promoted Cu/ZnO supported on Al 2 O 3 pellet resulted in CO 2 conversion of 13.3 % compared to 11.61 % from that of SBA-15-supported catalyst. However, the catalyst supported on SBA-15 pellet exhibited 54.59% methanol selectivity, whereas Al 2 O 3 -supported catalyst only resulted in 46.73 % methanol selectivity.