Abstract:The ethylene oxidation activities of silica-supported platinum-based catalysts (Pt/A380 and PtRu/A380) were studied under a semi-practical condition (liter-sized batch system, containing moisture and perishables). Storage tests of premature bananas, cucumbers...
“…We calculated the C 2 H 4 removal rate on Au 54 Pt 46 /ZHM20 in the steady state at 0 °C to be 120 mL (ethylene) /kg h, which is ~5× higher than the reported commercially used Pt/SBA-15 (25 mL (ethylene) /kg × h) 7 . This rate is also much higher than that of C 2 H 4 generated by fruits, such as apple (0.28 mL (ethylene) /kg h) according to the semi-practical conditions for the preservation of perishables 27 , proving the promising application possibility. Fig.…”
Efficient ethylene (C2H4) removal below room temperatures, especially near 0 °C, is of great importance to suppress that the vegetables and fruits spoil during cold-chain transportation and storage. However, no catalysts have been developed to fulfill the longer-than-2-h C2H4 removal at this low temperature effectively. Here we prepare gold-platinum (Au-Pt) nanoalloy catalysts that show robust C2H4 (of 50 ppm) removal capacity at 0 °C for 15 days (360 h). We find, by virtue of operando Fourier transformed infrared spectroscopy and online temperature-programmed desorption equipped mass spectrometry, that the Au-Pt nanoalloys favor the formation of acetate from selective C2H4 oxidation. And this on-site-formed acetate intermediate would partially cover the catalyst surface at 0 °C, thus exposing active sites to prolong the continuous and effective C2H4 removal. We also demonstrate, by heat treatment, that the performance of the used catalysts will be fully recovered for at least two times.
“…We calculated the C 2 H 4 removal rate on Au 54 Pt 46 /ZHM20 in the steady state at 0 °C to be 120 mL (ethylene) /kg h, which is ~5× higher than the reported commercially used Pt/SBA-15 (25 mL (ethylene) /kg × h) 7 . This rate is also much higher than that of C 2 H 4 generated by fruits, such as apple (0.28 mL (ethylene) /kg h) according to the semi-practical conditions for the preservation of perishables 27 , proving the promising application possibility. Fig.…”
Efficient ethylene (C2H4) removal below room temperatures, especially near 0 °C, is of great importance to suppress that the vegetables and fruits spoil during cold-chain transportation and storage. However, no catalysts have been developed to fulfill the longer-than-2-h C2H4 removal at this low temperature effectively. Here we prepare gold-platinum (Au-Pt) nanoalloy catalysts that show robust C2H4 (of 50 ppm) removal capacity at 0 °C for 15 days (360 h). We find, by virtue of operando Fourier transformed infrared spectroscopy and online temperature-programmed desorption equipped mass spectrometry, that the Au-Pt nanoalloys favor the formation of acetate from selective C2H4 oxidation. And this on-site-formed acetate intermediate would partially cover the catalyst surface at 0 °C, thus exposing active sites to prolong the continuous and effective C2H4 removal. We also demonstrate, by heat treatment, that the performance of the used catalysts will be fully recovered for at least two times.
Supported metal catalysts are one of the most important heterogeneous catalysts, and they are widely used in chemical processes such as naphtha reforming, purification of exhaust gas from automobiles and so on. However, rational design of supported metal catalysts is still a target in heterogeneous catalysis. The author had a hypothesis that metal nanoparticles in ordered pores of zeolite or mesoporous silica may exhibit novel catalytic properties. Based on this idea, we used micropores of zeolites to accommodate metal carbonyl clusters, and then mesoporous silica to prepare metal nanoparticles. First, we studied ship-in-bottle synthesis of Rh carbonyl clusters in zeolite and its reactivity. Rh6(CO)16 was synthesized in NaY zeolite accompanied with formation of a mononuclear Rh(CO)2, which acted as a carrier of 13CO in 12CO-13CO exchange reaction. Then we worked on synthesis of platinum nanoparticles in mesoporous silica, and found that high activity in preferential oxidation of CO in hydrogen and in low-temperature oxidation of ethylene. The high catalytic performance in ethylene oxidation has led to practical application of platinum/silica catalysts for preservation of fruits and vegetables, resulting in reduction of food waste. This article describes the development process of this research.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
