Structure sensitivity of iron oxide catalyst for CO2 hydrogenation

Surface conversion of CuO–ZnO to ZIF-8 to enhance CO2 adsorption for CO2 hydrogenation to methanol

A novel CuO–ZnO@ZIF-8 catalyst with abundant oxygen vacancies and high CO2 adsorption capacity is synthesized for converting CO2 into CH3OH. Compared to the traditional CuO–ZnO catalyst, the catalyst in this work significantly improves the conversion and selectivity.

Modified fischer-tropsch synthesis: A review of highly selective catalysts for yielding olefins and higher hydrocarbons

Global warming, fossil fuel depletion, climate change, as well as a sudden increase in fuel price have motivated scientists to search for methods of storage and reduction of greenhouse gases, especially CO2. Therefore, the conversion of CO2 by hydrogenation into higher hydrocarbons through the modified Fischer–Tropsch Synthesis (FTS) has become an important topic of current research and will be discussed in this review. In this process, CO2 is converted into carbon monoxide by the reverse water-gas-shift reaction, which subsequently follows the regular FTS pathway for hydrocarbon formation. Generally, the nature of the catalyst is the main factor significantly influencing product selectivity and activity. Thus, a detailed discussion will focus on recent developments in Fe-based, Co-based, and bimetallic catalysts in this review. Moreover, the effects of adding promoters such as K, Na, or Mn on the performance of catalysts concerning the selectivity of olefins and higher hydrocarbons are assessed.

Synthesis of surface-modified iron oxide nanocrystals using supercritical carbon dioxide as the reaction field

We applied the supercritical CO2 technology, which is an excellent solventless process, to the synthesis of surface-modified iron oxide nanocrystals.

Towards the development of the emerging process of CO2 heterogenous hydrogenation into high-value unsaturated heavy hydrocarbons

The emerging process of CO₂ hydrogenation through heterogenous catalysis into important bulk chemicals provides an alternative strategy for sustainable and low-cost production of valuable chemicals, and brings an important chance for mitigating CO₂ emissions. Direct synthesis of the family of unsaturated heavy hydrocarbons such as α-olefins and aromatics via CO₂ hydrogenation is more attractive and challenging than the production of short-chain products to modern society, suffering from the difficult control between C-O activation and C-C coupling towards long-chain hydrocarbons. In the past several years, rapid progress has been achieved in the development of efficient catalysts for the process and understanding of their catalytic mechanisms. In this review, we provide a comprehensive, authoritative and critical overview of the substantial progress in the synthesis of α-olefins and aromatics from CO₂ hydrogenation via direct and indirect routes. The rational fabrication and design of catalysts, proximity effects of multi-active sites, stability and deactivation of catalysts, reaction mechanisms and reactor design are systematically discussed. Finally, current challenges and potential applications in the development of advanced catalysts, as well as opportunities of next-generation CO₂ hydrogenation techniques for carbon neutrality in future are proposed.

Adjusting the CO2 hydrogenation pathway via the synergic effects of iron carbides and iron oxides

The synergic effects of iron carbides and iron oxides were used to adjust the reaction pathway to form alkenes or ethanol.

Phase transformation of iron oxide to carbide and Fe3C as an active center for the RWGS reaction

Fe3C was produced from iron oxide and identified as active and stable in the reverse water gas shift reaction.