Direct hydrogenation of CO2 to high-valued fuels is a process that can be likened to the “Trapping two fishes with a single worm”. This win–win situation addresses the ever-increasing problems associated with excessive CO2 emission as well as renewable energy supply. In this contribution, a thorough study is realized on 10 MR zeolites with one-dimensional (1D) and three-dimensional (3D) structures for the direct hydrogenation of CO2 to gasoline (C5–C11), with a high fraction of multibranched isoparaffins. Emphasis is placed on identifying the factors that favor isomerization and increase the number of branches on the isomers. Zeolites SAPO-11 and ZSM-5 were configured with Na/Fe3O4 (NaFe) in single-, dual-, and various triple-bed arrangements for this investigation. A dual-bed reaction with SAPO-11 and ZSM-5 coupled individually with the NaFe catalyst showed relatively higher selectivity for low-branched isoparaffins and aromatics, respectively. In the event of combining both the zeolites with NaFe as a physical mix and triple-bed systems, isoparaffins selectivity increased with improved multibranched isomers and reduced aromatics at the same time. Among these different tactics, the triple-bed system comprising the NaFe catalyst followed sequentially with SAPO-11 and ZSM-5 maximizes the selectivity for isoparaffins with the enhanced formation of multibranched isomers. The selectivity of gasoline reached 71.7% in hydrocarbons (HCs) with a maximum of 38.2% isoparaffins possessing a RON value of 91.7 at CO2 conversion of 31.2%. Multibranched isomers accounted for 28.3% in all C5+ isoparaffins, much higher than that of the single zeolite. Purposefully, hypothetical knowledge obtained from the prior model reactions on the zeolites served as a strong foundation to support and give insight into the results from the CO2 hydrogenation reactions.

In recent years, oil–water separation has been widely researched to reduce the influences of industrial wastewater and offshore oil spills. A filter membrane with special wettability can achieve the separation because of its opposite wettability for water phase and oil phase. In the field of filter membrane with special wettability, porous metal filter membranes have been much investigated because of the associated high efficiency, portability, high plasticity, high thermal stability, and low cost. This article provides an overview of the research progress of the porous metal filter membrane fabrication and discusses the future developments in this field.

Carbon monoxide (CO) hydrogenation is an important step for efficient utilization of carbon resources in C1 (one carbon) chemistry. Over recent years, this direction has been a hot research area in academia and industry and has also been one of the most challenging routes for the nonoil carbon resources utilization process. A large number of novel reaction routes and catalysts have been studied and reported. Efficient activation and directional conversion of CO are key aspects in the process of CO utilization. Furthermore, effectively activating C–O and C–C bond formation as well as controlling carbon chain growth is the current technical bottleneck of CO hydrogenation. This mini-review introduces the latest research progress for different catalyst systems and processes in CO hydrogenation and analyzes the factors that control the performance of catalysts in different reaction systems. Here, much focus is put on the synthesis of long-chain hydrocarbons, light olefins, C2+ oxygenates, and aromatics, essentially in comparison with the previous reports. Finally, the present challenges and future research directions have been discussed.

Two-dimensional (2D) metallic Pd nanosheets were synthesized by an ion-exchange method using PdCl4 2– and magnesium- and aluminum-based metallic (LDH) as intercalation ion and host material, respectively. The LDH-supported Pd catalyst (Pd/LDH) presented two kinds of existing forms of Pd species comprising Pd nanosheets and nanoparticles. Characterizations by FT-IR spectra and HAADF-STEM images revealed that the Pd nanosheets were intercalated into the sandwich layer of hydrotalcite. The Pd/LDH catalyst was probed for the catalytic hydrogenation of nitrobenzene to aniline, and the Pd/LDH catalyst exhibited excellent catalytic activity with a high TOF value of 133.8 h–1, much higher than that of 97.3 h–1 on LDH-supported Pd nanoparticles catalyst. The results indicated that the catalytic activity of the formed Pd nanosheets was far higher than that of Pd nanoparticles. The edges of 2D Pd nanosheets, due to its negatively electronic property as well as unsaturated coordination, could be the main reason for the enhanced catalytic hydrogenation.