Abstract
Waste nitrous oxide (N2O) was utilized as an oxidant for ethane oxydehydrogenation reaction at the temperature range from 450 °C to 700 °C over the mesoporous Cr/Al2O3 catalyst synthesized via the one-pot evaporation-induced self-assembly (EISA) method. The catalyst was characterized by X-ray diffraction, transmission electron microscopy, and nitrogen adsorption-desorption analysis. The obtained mesoporous material with favorable textural property and advantageous thermal stability was investigated as the catalyst for ethane oxydehydrogenation. It was found that the utilization of N2O as an oxidant for the oxydehydrogenation reaction of ethane resulted in simultaneous and complete N2O abatement. Moreover, the catalytic conversion of C2H6 to C2H4 was increased from 18% to 43% as the temperature increased from 450 °C to 700 °C. The increased N2O concentration from 5 vol % to 20 vol % resulted in an increased ethane conversion but decreased ethylene selectivity because the nonselective reactions occurred. Ethane was converted into ethylene with approximately 51% selectivity and 22% yield at 700 °C and N2O concentration of 10%. After a catalytic steady state was reached, no obvious decline was observed during a 15 h evaluation period.
Highlights
Nitrous oxide (N2 O), a waste by-product and an environmental pollutant generated mainly from anthropogenic emissions and industrial processes such as adipic acid and nitric acid plants, has more than 300 times greater potential than CO2 to cause global warming and ozone depletion [1].The abatement of N2 O has been a topic of environmental relevance
It is noteworthy that no additional isolated chromium-based particle was detected over the entire network, and the introduction of Cr via the one-pot evaporation-induced self-assembly (EISA) method did not destroy the mesoporous structure of alumina, which is consistent with the X-ray diffraction (XRD) characterization results
The combination of the XRD and Transmission electron microscopy (TEM) results convinced us that the ordered mesoporous Cr/Al2 O3 was obtained and the mesoporous framework was successfully preserved after 700 ◦ C calcination, demonstrating good thermal stability
Summary
Nitrous oxide (N2 O), a waste by-product and an environmental pollutant generated mainly from anthropogenic emissions and industrial processes such as adipic acid and nitric acid plants, has more than 300 times greater potential than CO2 to cause global warming and ozone depletion [1]. Investigated the process of coke deposition over chromia-alumina during propane dehydrogenation using in-situ UV Raman spectroscopy analysis They observed the polynuclear aromatic hydrocarbons and polyenes when reaction temperature was relatively low (400 ◦ C), and the conjugated olefins when increasing the temperature to >500 ◦ C. Hartmann et al [17], Schwieger et al [18], and Su et al [19] introduced a substantial amount of mesopores into the microporous structured zeolite of Fe/ZSM-5, and an improved catalyst longevity was obtained during the oxidation of benzene to phenol process In this contribution, a highly active and stable chromia-alumina catalyst was proposed, and the textural properties were determined. Our concept is based on the combination of the exothermic N2 O decomposition with the thermal dehydrogenation of ethane, with the aim to completely remove the N2 O and simultaneously the production of C2 H4 from C2 H6
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