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Influence of reduction temperature on the formation of intermetallic Pd 2 Ga phase and its catalytic activity in CO 2 hydrogenation to methanol
Author(s) -
Ahmad Kaisar,
Upadhyayula Sreedevi
Publication year - 2019
Publication title -
greenhouse gases: science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 32
ISSN - 2152-3878
DOI - 10.1002/ghg.1872
Subject(s) - bimetallic strip , catalysis , methanol , chemisorption , intermetallic , selectivity , phase (matter) , temperature programmed reduction , carbon monoxide , analytical chemistry (journal) , materials science , atmospheric pressure , transmission electron microscopy , syngas , atmospheric temperature range , bar (unit) , chemistry , chemical engineering , metallurgy , alloy , nanotechnology , thermodynamics , organic chemistry , oceanography , physics , engineering , geology , meteorology
Abstract The global warming and change in climatic conditions due to rising concentration of CO 2 in atmosphere are the most important challenges of 21st century. Catalytic conversion of CO 2 to methanol will not only check global warming but also provide an alternative source of fuel. The phase purity of solid catalysts has a considerable influence on the desired product selectivity. Reduction temperature is one of the most important parameters responsible for catalyst phase formation. Herein, the effect of a range of reduction temperatures between 100 and 600°C on the phase composition of Pd–Ga bimetallic catalyst and CO 2 hydrogenation to methanol activity was investigated. X‐ray diffraction (XRD) analysis revealed the formation of different phases at different reduction temperatures. The variation in catalyst structure was also analyzed using field emission scanning electron microscope‐energy dispersive X‐ray spectroscopy (FESEM‐EDS), Brunaue–Emmett–Teller, H 2 chemisorption, and transmission electron microscopy techniques. The influence of reduction temperature, pressure (1–25 bar), H 2 /CO 2 ratio (3–9), and reaction temperature (150–250°C) on methanol and CO selectivity from CO 2 hydrogenation at atmospheric pressure was also studied. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.