Synthesis of DME by CO2 hydrogenation over La2O3-modified CuO-ZnO-ZrO2/HZSM-5 catalysts

Abstract

Article Highlights • La-modified CuO-ZnO-ZrO2/HZSM-5 catalysts were prepared by an oxalate co-precipitation method • La-modified CuO-ZnO-ZrO2/HZSM-5 catalysts show higher catalytic performances • The catalytic performances of the catalysts are strongly dependent on the La content

Advanced zeolite and ordered mesoporous silica-based catalysts for the conversion of CO2to chemicals and fuels

“…435,551 Accordingly, La 2 O 3 -modified CuO–ZnO–ZrO 2 /HZSM-5 catalysts were prepared by an oxalate co-precipitation method for DME direct synthesis (Table 5, entry 29). 552 A suitable amount of La 2 O 3 improved the catalytic performance of CuO–ZnO–ZrO 2 /HZSM-5, and maximum 34.3% CO 2 conversion and 57.3 and 19.6% DME selectivity and yield were obtained over the catalyst with 1% La 2 O 3 at 270 °C and 3 MPa. The addition of La 2 O 3 modified the population and strength of acid sites as well as the dispersion of Cu and reducibility of CuO with a larger Cu + /Cu ratio.…”

Direct Synthesis of Dimethyl Ether from CO2: Recent Advances in Bifunctional/Hybrid Catalytic Systems

“…Considering the previous study of Guo et al [140] on the effect of La doping on Cu/ZrO 2 catalysts, this enhancement is associated with an increase in the amount of basic sites that enhance the adsorption of CO 2 and the selectivity toward methanol formation [140]. The best CO 2 conversion (34.3%) and selectivity toward DME (57.3%) was achieved with the catalyst modified with 1% La 2 O 3 , which was linked to the optimization of the adsorption of CO 2 and the formation of the smaller Cu active species [139].…”

“…Recently, Zhang et al [139] studied CuO-ZnO-ZrO 2 /HZSM-5 hybrids modified with La 2 O 3 prepared by co-precipitation. It was found that the catalyst modification with La 2 O 3 enhanced its performance in direct CO 2 hydrogenation to DME (270 • C and 30 MPa).…”

The influence of composition on the functionality of hybrid CuO–ZnO–Al2O3/HZSM-5 for the synthesis of DME from CO2 hydrogenation

“…The CO 2 conversion as well as the selectivity toward CO, CH 3 OH and DME are calculated by internal standard method. 32,33 X CO 2 , S P i and Y DME represent the conversion of CO 2 , the selectivity of the product (DME, MeOH, CO) and the yield of DME, respectively. Each experimental data was corresponds to an average of three independent measurements, with error of ±2%.…”