Calcium looping (CaL) integrated with methane dry reforming (DRM) shows promise for carbon capture and utilization. To enhance the CaL− DRM tandem processes, a raspberry-structured aerosol dual-functional material composed of CaO (CO 2 adsorbent), Ni (DRM catalyst), and CeO 2 (promoter) was fabricated via gas-phase evaporation-induced self-assembly. The utilization of Ca−Ni−Ce is highly beneficial by the creation of metal−support−promoter interaction for promoting an effective carbon capture followed by interfacial catalysis, providing an alternative pathway with enhanced redox ability and reduction of activation energy. The Ca−Ni−Ce composite materials with clustered particle characteristics showed great improvement in the performance of cyclic CaL−DRM in comparison to the reported values: low required carbonation/decarbonation temperatures (400/600 °C), high CO 2 uptake efficiency (12.1 mmol COd 2 /g CaO ), ultrahigh CO 2 conversion (97.2%) under relatively low-temperature operation (600 °C), and sufficiently high operational stability. Overall, the proposed Ca−Ni−Ce hybrid material fabricated via the aerosol synthetic method demonstrates significant advances in the low-temperature CaL−DRM processes, showing promise as a sustainable chemical engineering route for industrial applications.
A quantitative study of the synthesis
of metal–organic framework
(MOF) colloids via a solvothermal growth process was demonstrated
using electrospray-differential mobility analysis (ES-DMA), a gas-phase
electrophoresis approach. HKUST-1, a copper-based MOF (Cu-MOF), was
selected as the representative MOF of the study. The effects of the
synthetic parameters, including ligand concentration (C
BTC), synthetic temperature (T
s), and synthetic time (t
s) versus material
properties of the Cu-MOF, were successfully characterized based on
the mobility size distributions measured by ES-DMA. The results show
that the mobility size of Cu-MOF was proportional to T
s, t
s, and C
BTC during the solvothermal growth. X-ray diffraction
and Brunauer–Emmett–Teller analyses were employed complementarily
to the ES-DMA, confirming that the increase in mobility size of Cu-MOF
was correlated to the increase in crystallinity (i.e., larger specific
surface area and crystallite size). The results of CO2 pulse
adsorption show that the synthesized Cu-MOF possessed a good CO2 adsorption ability under 1 atm, 35 °C, and the cumulative
amount of CO2 uptake was proportional to the measured mobility
size of Cu-MOF. The work provides a proof of concept for the controlled
synthesis of MOF colloids with the support of gas-phase electrophoretic
analysis, and the quantitative methodology is useful for the development
of MOF-based applications in CO2 capture and utilization.
Interest in multifunctional nanoparticles is currently rising due to the increasing demand in green energy and environmental applications. The aerosol-based synthetic route emerges as a promising method for enabling the fabrication of multifunctional nanoparticles in a continuous and scalable manner. Meanwhile, interfacial catalysis is receiving great attention to enhance the performance of chemical reactions. In this regard, the utilization of aerosol nanoparticles is highly beneficial to the catalysis field by the creation of strong metal−support−promoter interactions for promoting interfacial catalysis. In this Perspective, aerosol-based synthesis of hybrid nanoparticles is briefly discussed. In addition, the interfacial catalysis of CO oxidation, methane combustion, CO 2 hydrogenation, and dry reforming of methane are discussed to provide fundamental insights and concepts for the rational design of nanocatalysts with efficient interfaces.
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