Effect of promoter SiO2, TiO2 or SiO2-TiO2 on the performance of CuO-ZnO-Al2O3 catalyst for methanol synthesis from CO2 hydrogenation

Hydrogen Utilization in Green Fuel Synthesis via CO2 Conversion to Methanol over New Cu-Based Catalysts

“…The results of catalytic tests in the CO2 hydrogenation in the range of 453-513 K and at 0.1, 3.0 and 5.0 MPa are summarized in Table 2 in terms of H2 conversion ( As extensively reported in literature, CO2 hydrogenation drives to methanol and CO over Cubased catalyst through the reactions of methanol synthesis (Equations (1) and (2)) and Reverse Water Gas Shift (Equation (3)), while the methane formation (Equation (4)) is strongly un-favored under such reaction conditions [27,37]:…”

“…As extensively reported in literature, CO 2 hydrogenation drives to methanol and CO over Cu-based catalyst through the reactions of methanol synthesis (Equations (1) and (2)) and Reverse Water Gas Shift (Equation (3)), while the methane formation (Equation (4)) is strongly un-favored under such reaction conditions [27,37] In respect of this, a progressive increase of H 2 conversion, associated with a significant decrease in methanol selectivity, has been observed with the increase in temperature, independent of chemical composition and pressure. According to the greater partial pressure of reactants on the catalyst surface, the H 2 conversion increases further over all samples by upping the pressure from 0.1 MPa to 5.0 MPa.…”

Effect of TiO2, ZrO2, and TiO2–ZrO2 on the performance of CuO–ZnO catalyst for CO2 hydrogenation to methanol

“…The Cu-ZnO/Al 2 O 3 catalysts have a considerably high activity for methanol synthesis from syngas. However, their unsatisfactory CO 2 hydrogenation performance, due to a negative effect of water in the presence of the hydrophilic alumina carrier [7,8], is pressing the discovery of alternative catalyst formulations including copper as activity phase and various oxide supports and promoters like ZnO [9], Al 2 O 3 [10,11], TiO 2 [11][12][13][14][15], SiO 2 [11,15], ZrO 2 [15][16][17][18][19], CeO 2 [20,21] or their combinations [20][21][22]. Among the additives studied, ZnO, ZrO 2 and TiO 2 are very promising catalyst supports and/or promoters.…”

Hydrogenation of CO 2 to CH 3 OH over Cu/ZnO catalysts with different ZnO morphology

“…(2)). The conversion of CO 2 is lower and/or CO is 53 the main product in most works [14][15][16][17]. It is believed that both 54 CO and water inhibit the formation of methanol from CO 2 [18], 55 reverse water gas shift reaction leads to a poor methanol yield.…”