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Cetyltrimethylammonium Bromide‐Promoted, ZnO‐Supported, and Mn‐Promoted Cu–Fe Catalyst for the Hydrogenation of CO to Low‐Carbon Alcohols
Author(s) -
Hu Wei,
Li Wei,
Shen Rongchun
Publication year - 2017
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201600366
Subject(s) - catalysis , x ray photoelectron spectroscopy , bromide , coprecipitation , inorganic chemistry , chemistry , selectivity , carbon fibers , nuclear chemistry , materials science , chemical engineering , organic chemistry , composite number , composite material , engineering
A Mn‐promoted CuFe/ZnO catalyst was synthesized by a coprecipitation method using sodium carbonate as the precipitant and characterized by using BET surface area measurements, SEM, energy‐dispersive X‐ray spectroscopy, IR spectroscopy, XRD, temperature‐programmed reduction (TPR), and X‐ray photoelectron spectroscopy (XPS). The results demonstrated that the reducibility of Cu species was enhanced and that Cu–Fe 3 C dual active sites were generated over the ZnO support. Therefore, the MnCuFe/ZnO catalyst showed a higher activity and selectivity towards low‐carbon (C 2 –C 4 ) alcohols than Cu–Fe‐based catalysts with or without a Zn promoter. Meanwhile, the contribution of cetyltrimethylammonium bromide (CTAB) used in the catalyst preparation process was also investigated. As a result, CTAB had a prominent influence on the promotion of the SC2 - 4 OH / S alc ( S =selectivity, alc=total alcohols) ratio, which increased from 52 to 63 %, and the yield of low‐carbon alcohols reached 0.151 g mL cat. −1 h −1 . The TPR and XPS results indicated that more Cu 2+ was reduced to metallic Cu 0 on CTAB‐MnCuFe/ZnO, which suggests that the catalyst was better reduced. The XRD results insinuated that more Cu–Fe 3 C dual active sites were generated, which facilitated the formation of low‐carbon alcohols. Furthermore, a CTAB/Cu molar ratio of 1.0 was the optimum ratio for the formation of low‐carbon alcohols.