A novel Core–Shell structured CuIn@SiO₂ catalyst for CO₂ hydrogenation to methanol

Abstract

CO 2 hydrogenation is one of the most promising processes in response to energy crisis and greenhouse gas emission. There is, however, still a lack of a highly efficient and sustainable catalyst for this reaction. In this study, a novel low-cost coreshell structured CuIn@SiO 2 catalyst is prepared by a solvothermal method and used for catalyzing CO 2 hydrogenation to methanol. A significant interaction exists between Cu and In, promoting Cu dispersion and reducibility, Cu 2 In alloy and oxygen vacancy formation. Moreover, plenty of interfacial sites are formed between Cu 2 In and In 2 O 3 , which further enhances CO 2 adsorption and activation. CuIn@SiO 2 , therefore, shows not only a satisfactory catalytic stability due to core-shell formation but also an excellent catalytic performance. 9.8% CO 2 conversion, 78.1% CH 3 OH selectivity, and 13.7 mmol CH 3 OH Áh −1 Ág cat −1 CH 3 OH space-time yield are obtained at the space velocity of 20,000 mLÁg cat −1 Áh −1 . CuIn@SiO 2 possesses a great potential as catalyst for CO 2 hydrogenation in a moderate condition in industry.

Novel Heterogeneous Catalysts for CO2 Hydrogenation to Liquid Fuels

“…Various bimetallic materials including Pd–Cu, 53 − 55 Pd–Ga, 56 , 57 Pd–In, 58 − 60 Pd–Zn, 61 Ni–Ga, 62 − 66 In–Rh, 67 In–Cu, 68 , 69 In–Co, 70 In–Ni, 71 , 72 and Ni–Cu 55 , 73 have also been examined for methanol production from CO 2 hydrogenation. Among these catalysts, some non-noble metal-based bimetallics were designed for efficient CO 2 hydrogenation to CH 3 OH at low pressure.…”

Selective steam reforming of n‐dodecane over stable subnanometric NiPt clusters encapsulated in Silicalite‐1 zeolite

“…Zeolite materials were deemed as idea supports to confine metal particles, owing to the diverse porosities, controllable synthesis process, and large surface areas. [27][28][29][30] The encapsulating Ni NPs in mesoporous zeolites, thus enhancing sintering resistance, has been reported by several groups. 17,[31][32][33][34][35][36][37][38][39] For example, Gong et al…”

“…Active metal species were confined in space of a protective shell or matrix, which would restrain aggregation of metal nanoparticles. Zeolite materials were deemed as idea supports to confine metal particles, owing to the diverse porosities, controllable synthesis process, and large surface areas . The encapsulating Ni NPs in mesoporous zeolites, thus enhancing sintering resistance, has been reported by several groups .…”

Designing Nanoparticles and Nanoalloys for Gas-Phase Catalysis with Controlled Surface Reactivity Using Colloidal Synthesis and Atomic Layer Deposition

“…As an alternative to the aforementioned Cu/ZnO materials, Shi et al [188] synthesized CuIn@SiO 2 core-shell materials with superior anti-segregation properties. In activity tests, the catalytic performance was superior to that of CuIn/SiO 2 , both initially and after 100 h TOS.…”