Macropore-Size Engineering toward Enhancing the Catalytic Performance of CO Oxidation over Three-Way Catalyst Particles

Abstract

In recent years, transportation-related air pollution has escalated into a global concern, necessitating the development of a three-way catalyst (TWC) technology to address harmful emissions. However, the efficiency of TWC’s performance in mitigating these emissions has been hindered because of limited mass transfer efficiency within their structures. Thus, this study attempted to overcome the existing issue by synthesizing a series of macroporous TWC particles exhibiting various macropore sizes via a template-assisted spray process, aiming to achieve optimal mass transfer efficiency and catalytic performance. The synthesis incorporated various template particles (size of 67–381 nm) to obtain various macroporous structures. Thereafter, these macroporous particles were assessed for their carbon monoxide (CO) oxidation performance, revealing a substantial influence of the macropore size on the catalytic performance of TWC structures. Interestingly, among the investigated samples, those containing the smallest and largest macropores demonstrated the highest CO oxidation performances. Based on these results, a plausible reactant diffusion mechanism was proposed to explain the effect of the macropore size on the diffusion efficiency within the macroporous structures. This work may have significant implications in optimizing the macroporous structure to enhance catalytic performance in the gas purification process.

Controllable Synthesis of Porous and Hollow Nanostructured Catalyst Particles and Their Soot Oxidation

“…During the measurement, the mixture gas was used to investigate the CO oxidation performance, whereas the furnace temperature was set to a range of 50–200 °C. The CO conversion was calculated using eq CO conversion false[ % false] = CO in − CO out CO in × 100 % where CO in and CO out represent the peak area of CO molecules (mol) measured by a gas chromatograph (GC-14B, Shimadzu, Japan) at the inlet and outlet of the catalyst bed, respectively.…”

“…During the measurement, the mixture gas was used to investigate the CO oxidation performance, whereas the furnace temperature was set to a range of 50−200 °C. The CO conversion was calculated using eq 1 22…”

“…21 To investigate the effect of template particle size on nanostructured particles, Le et template poly(methyl methacrylate) (PMMA) particles (67− 381 nm) through the spraying method. 22 As a result, macroporous TWC particles with different pore sizes were successfully synthesized, and the effect of the pore size on macroporous TWC properties was experimentally clarified. However, for controlling the nanostructured particles using TWCs, the effect of the template surface charge on the particle structure has not been investigated so far.…”

“…The important factors involved in controlling nanostructured particles are the particle size and surface charge properties of the template material . To investigate the effect of template particle size on nanostructured particles, Le et al synthesized macroporous TWC particles using various sizes of template poly­(methyl methacrylate) (PMMA) particles (67–381 nm) through the spraying method . As a result, macroporous TWC particles with different pore sizes were successfully synthesized, and the effect of the pore size on macroporous TWC properties was experimentally clarified.…”

Effects of Coating Characteristics of One-Step Aerosol Synthesized–Silica-Coated FeNi Nanostructured Particles on Powder Core Properties for Electronic Machine Development

“…Nanostructured materials have revolutionized diverse fields like energy, food, and environment due to their exceptional versatility. − Their unique properties arise from their intricate morphologies, which can vary widely including being porous, hollow, dense, core–shell, and so forth. In recent years, the rapid advancement of technology has spurred the development of electric devices demanding innovative solutions to increase efficiency and compact their designs .…”