Enhanced Catalytic Performance for CO₂ Hydrogenation to Methanol over N‐doped Graphene Incorporated Cu‐ZnO‐Al₂O₃ Catalysts

Abstract

N-doped graphene (NG) incorporated Cu-ZnO-Al 2 O 3 (CZA) catalysts were prepared by co-precipitation method and their catalytic performances for CO 2 hydrogenation to methanol were evaluated under the reaction conditions of 200 ○C and 3.0 MPa. The results indicate that NG promotes effectively the dispersion of CZA and changes the electron structure of CZA, which could provide synergistic effect for methanol synthesis. When NG content is 10 wt.%, the CO 2 conversion and methanol selectivity can achieve the highest values of 8.2% and 84%, respectively, which are much higher than those of traditional CZA catalyst.[a] Dr.

Direct Synthesis of Liquefied Petroleum Gas from Carbon Dioxide Using a Copper/Zinc Oxide/Zirconia/Alumina and HY Zeolite Hybrid Catalyst

“…that showed metallic Cu surface area after reduction of 30.45 m 2 g cat −1 the value close to the previous study [23] . Moreover, metallic properties of Cu demonstrated high Cu dispersion value of 11.36 % due to the influenced of adding ZrO 2 [24] …”

“…[23] Moreover, metallic properties of Cu demonstrated high Cu dispersion value of 11.36 % due to the influenced of adding ZrO 2 . [24] Com-HY zeolite was analyzed by XRD, where the patterns showed consistent diffraction peaks (Figure 2). The textural properties of the com-HY, as measured by N 2 adsorptiondesorption, revealed a typical I isotherm (Figure 3), indicating that com-HY demonstrated a typically microporous structure [25][26] with the properties of the S BET area and pore volume (V) of 552.46 m 2 g À 1 and 0.28 cm 3 g À 1 , respectively.…”

Carbon‐Modified CuO/ZnO Catalyst with High Oxygen Vacancy for CO2 Hydrogenation to Methanol

“…In addition, for CuO–ZnO–ZrO2–Al 2 O 3 catalysts, the use of reduced graphene oxide (rGO) is favorable for the production of methanol from CO 2 hydrogenation . In addition, the addition of the N‐doped graphene can change the electron structure of Cu–ZnO–Al 2 O 3 catalysts, which could provide a synergistic effect for methanol synthesis . In our research, previous characterizations of TEM (Figure ), XPS (Figure d), and Raman spectroscopy (Figure ) can confirm the presence of the carbon layer in CuO/ZnO‐400 catalysts.…”

“…The same discovery of carbon layers in MOFs‐derived catalysts has also been confirmed by TEM in references . Graphene layers were discovered by similar methods in graphene‐supported catalysts . The flocs layers are identified as carbon layers combining with the analysis of XPS and Raman spectroscopy that will be discussed in detail later.…”

Impacts of the Catalyst Structures on CO2 Activation on Catalyst Surfaces

“…These kinds of catalysts have high surface areas and improved adsorption properties. Carbon materials, such as carbon nanotubes (CNTs) and graphene oxides (GOs), and metal oxides (e.g., TiO 2 , CeO 2 , Al 2 O 3 , ZrO 2 , In 2 O 3 , Ga 2 O 3 , and NiO) can be grafted to form hybrid nanostructured materials [154,[188][189][190]. Carbon materials possess very high surface areas, whereas metal oxides are endowed with rich oxygen vacancies.…”