Ethylene (C2H4) gas is produced throughout the life cycle of plants and can accumulate in closed growth chambers to levels 100 times higher than in outside environments. Elevated atmospheric C2H4 can cause a variety of abnormal responses, but the sensitivity to elevated C2H4 is not well characterized. We evaluated the C2H4 sensitivity of wheat (Triticum aestivum L.) and rice (Oryza sativa L.) i...

In the present study, a global kinetic model of three-way-catalyst-coated gasoline particulate filters was developed to understand relevant mechanisms taking place both in clean and real soot-loaded filters. The involves reaction rate expressions for CO, C2H4, C7H8 conversion over Pd/CeZr/Al2O3 catalyst, hydrothermally treated at 650 °C. Particularly, new expression proposed ethylene based on d...

A photo excitation fast flow reactor coupled with a single-photon ionization (118 nm, 10.5 eV) time-of-flight mass spectrometry (TOFMS) instrument is used to investigate reactions of neutral MnmOn clusters with C2H4 under visible (532 nm) light irradiation. Association products Mn2O5(C2H4) and Mn3O6,7(C2H4) are observed without irradiation. Under light irradiation, the Mn2O5(C2H4) TOFMS feature...

In situ Raman spectroscopy is rapidly becoming a very popular catalyst characterization method because Raman cells are being designed that can combine in situ molecular characterization studies with simultaneous fundamental quantitative kinetic studies. The dynamic nature of catalyst surfaces requires that both sets of information be obtained for a complete fundamental understanding of catalyti...

The dehydrogenation of ethane to ethylene in the presence of oxygen and water was conducted using Na2WO4/SiO2 catalyst at high temperatures. At 923 K, the conversion rate without water was proportional to ethane pressure and a half order of oxygen pressure, consistent with a kinetically relevant step where an ethane molecule is activated with dissociated oxygen on the surface. When water was pr...

In this study, the partial oxidation of iso-octane over Ni/Ce0.75Zr0.25O2 and Ni/β”Al2O3 catalysts was investigated. The results indicated that Ni/Ce0.75Zr0.25O2 is more active than Ni/β”-Al2O3. The partial oxidation products are mainly H2 and CO for Ni/Ce0.75Zr0.25O2 with hydrogen selectivity up to 85%. The H2/CO ratio is in the range of 1.3-2.0 depending on the operating temperature. It was n...

The oxidation of copper catalysts during ethylene epoxidation was characterized using in situ photoemission spectroscopy and electron microscopy. Gas chromatography, proton-transfer reaction mass spectrometry and electron-ionization mass spectrometry were used to characterize the catalytic properties of the oxidized copper. We find that copper corrodes during epoxidation in a 1 : 1 mixture of o...

C2H4 is an essential precursor for synthesis of a range industrial chemicals while contributing ∼150 Mt CO2e emissions per year. via electrochemical CO2 reduction reaction (CO2RR) attractive approach to reduce carbon emissions. The lower single-pass conversion (<10%) the state-of-the-art electrolyzers contributes significantly cost post-CO2RR separation products, rendering even processes with h...

We report herein the preparation, characterization, and catalytic performance of a series heterogeneous catalysts featuring highly dispersed zinc sites on zeolitic SSZ-13 ZSM-5 frameworks. The materials are evaluated in CO2-assisted oxidative ethane dehydrogenation, very important reaction for synthesis platform chemicals. In particular, we find that Zn2.92/SSZ-13 exhibits high reactivity conve...