Synthesis of methanol over highly dispersed Cu-Fe based catalysts derived from layered double hydroxides

Jing Tian; Weixin Qian; Haitao Zhang; Hongfang Ma; Weiyong Ying

doi:10.1039/d3ra01188g

Synthesis of methanol over highly dispersed Cu-Fe based catalysts derived from layered double hydroxides

RSC Adv. 2023 May 9;13(20):13902-13910. doi: 10.1039/d3ra01188g. eCollection 2023 May 2.

Authors

Jing Tian¹, Weixin Qian¹, Haitao Zhang¹, Hongfang Ma¹, Weiyong Ying¹

Affiliation

¹ Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology Shanghai 200237 China wxqian@ecust.edu.cn.

Abstract

In this paper, catalysts with different aluminum contents were prepared by a co-precipitation method using LDHs (layered double hydroxides) as the precursors through the adjustment of Cu²⁺ : Fe²⁺, and the catalysts were named LDO catalysts. The effect of aluminum on CO₂ hydrogenation to methanol was investigated by evaluating the characterization. With the addition of Al, Ar physisorption results showed an increase in BET-specific surface area, TEM demonstrated a decrease in catalyst particle diameter, XRD showed that Cu and Fe existed in the catalyst mainly in the form of CuFe₂O₄ and CuO, XPS demonstrated a decrease in electron cloud density and an increase in base sites and oxygen vacancies, and CO₂-TPD and H₂-TPD results indicated that Al promoted the dissociation and adsorption of CO₂ and H₂. When the reaction temperature was 230 °C, the pressure was 4 MPa, H₂/CO₂ = 2.5 and the space velocity was 2000 ml (h g_cat)^-1, the best conversion (14.87%) and the highest methanol selectivity (39.53%) of the catalyst were obtained at 30% aluminum content.