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Role of Caesium in Higher Alcohol Synthesis over Modified Copper–Cobalt Nanocomposites under Mild Conditions
Author(s) -
Das Subhasis,
Sengupta Manideepa,
Bordoloi Ankur
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201700013
Subject(s) - selectivity , catalysis , cobalt , copper , x ray photoelectron spectroscopy , desorption , carbon monoxide , nanocomposite , inorganic chemistry , chemistry , alcohol , temperature programmed reduction , lanthanum , adsorption , caesium , nuclear chemistry , materials science , chemical engineering , organic chemistry , nanotechnology , engineering
Cu–Co nanocomposites with and without Cs promoter on a modified lanthanum–alumina support were prepared by the combination of two unique synthesis methods. The synthesized materials were exclusively characterized by means of XRD, BET surface area determination, H 2 temperature‐programmed reduction, CO 2 temperature‐programmed desorption, N 2 O frontal chromatography, X‐ray photoelectron spectroscopy, high‐resolution TEM, and elemental mapping techniques, and its catalytic properties were thoroughly investigated for the selective synthesis of higher alcohols in the CO hydrogenation reaction by using a H 2 /CO ratio of 1, a temperature range of 180–300 °C and a pressure variation of 15–60 bar. Cs incorporation and a Cu/Co ratio of three was found to be a very efficient combination to obtain alcohol selectivities up to 55 %. This was explained by the fact that Cs increases the surface area of Cu particles by migrating Cu towards the surface layer and strengthens the surface interaction of Cu and Co. The further increase in higher alcohols selectivity then results from the limited formation of methane and carbon dioxide.