TY - JOUR
T1 - Enhanced CO2 hydrogenation to higher alcohols over K-Co promoted In2O3 catalysts
AU - Witoon, Thongthai
AU - Numpilai, Thanapha
AU - Nijpanich, Supinya
AU - Chanlek, Narong
AU - Kidkhunthod, Pinit
AU - Cheng, Chin Kui
AU - Ng, Kim Hoong
AU - Vo, Dai Viet N.
AU - Ittisanronnachai, Somlak
AU - Wattanakit, Chularat
AU - Chareonpanich, Metta
AU - Limtrakul, Jumras
N1 - Funding Information:
This research was supported in part by the National Research Council of Thailand (grant no. N41A640081 and N42A640324 for T.W. and M.C.), the Kasetsart University Research and Development Institute (KURDI) through its program of Development of Advance Researcher Competence System for Competitiveness in Agriculture and Food, and the Thailand Science Research and Innovation through its program of fundamental fund (FF(KU)21.65).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/3/1
Y1 - 2022/3/1
N2 - The use of CO2 to produce higher alcohols is a promising route to reduce emissions and make a profit. However, low activity of existing catalysts is a barrier for such processes to reach the industrial level. Here we report a novel K-Co promoted In2O3 catalyst for CO2 hydrogenation to higher alcohols. The K-Co promoted In2O3 with an optimum K and Co of 2.5 and 5.0 wt% achieves a high C2+OH space time yield of 169.6 g kgcat−1h−1 with the excellent C2+OH distribution of 87.4% in the total alcohols, while a very low space time yield of C2+OH (0.4 g kgcat−1h−1) is obtained over In2O3 promoted with 5 wt% Co. Characterization results reveal that, after reduction with H2 at 380 °C for 2 h, K-O-Co species is created for K-Co promoted In2O3 (2.5 wt% K and 5 wt% Co) sample which significantly reduces a number of weak H2 adsorption and strengthens the interaction of adsorbed H compared to 5 wt% Co promoted In2O3 sample containing a mixture of Co0 and CoO. The reduction of weak H2 adsorption and the improved interaction of adsorbed H with the catalyst surface retard the hydrogenation ability, allowing the CO insertion into adsorbed CxHy species prior to its hydrogenation to form hydrocarbon, resulting in a remarkable reduction of CH4 and higher hydrocarbon, and significant improvement of higher alcohols.
AB - The use of CO2 to produce higher alcohols is a promising route to reduce emissions and make a profit. However, low activity of existing catalysts is a barrier for such processes to reach the industrial level. Here we report a novel K-Co promoted In2O3 catalyst for CO2 hydrogenation to higher alcohols. The K-Co promoted In2O3 with an optimum K and Co of 2.5 and 5.0 wt% achieves a high C2+OH space time yield of 169.6 g kgcat−1h−1 with the excellent C2+OH distribution of 87.4% in the total alcohols, while a very low space time yield of C2+OH (0.4 g kgcat−1h−1) is obtained over In2O3 promoted with 5 wt% Co. Characterization results reveal that, after reduction with H2 at 380 °C for 2 h, K-O-Co species is created for K-Co promoted In2O3 (2.5 wt% K and 5 wt% Co) sample which significantly reduces a number of weak H2 adsorption and strengthens the interaction of adsorbed H compared to 5 wt% Co promoted In2O3 sample containing a mixture of Co0 and CoO. The reduction of weak H2 adsorption and the improved interaction of adsorbed H with the catalyst surface retard the hydrogenation ability, allowing the CO insertion into adsorbed CxHy species prior to its hydrogenation to form hydrocarbon, resulting in a remarkable reduction of CH4 and higher hydrocarbon, and significant improvement of higher alcohols.
KW - CO hydrogenation
KW - Higher alcohols
KW - K-Co-InO catalysts
KW - Metal-supports interactions
KW - Methanol
UR - http://www.scopus.com/inward/record.url?scp=85118886203&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2021.133211
DO - 10.1016/j.cej.2021.133211
M3 - Article
AN - SCOPUS:85118886203
SN - 1385-8947
VL - 431
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 133211
ER -