Enhanced CO2 hydrogenation to higher alcohols over K-Co promoted In2O3 catalysts

Thongthai Witoon, Thanapha Numpilai, Supinya Nijpanich, Narong Chanlek, Pinit Kidkhunthod, Chin Kui Cheng, Kim Hoong Ng, Dai Viet N. Vo, Somlak Ittisanronnachai, Chularat Wattanakit, Metta Chareonpanich, Jumras Limtrakul

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

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.

Original languageBritish English
Article number133211
JournalChemical Engineering Journal
Volume431
DOIs
StatePublished - 1 Mar 2022

Keywords

  • CO hydrogenation
  • Higher alcohols
  • K-Co-InO catalysts
  • Metal-supports interactions
  • Methanol

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