59 research outputs found

    Direct conversion of methane to zeolite-templated carbons, light hydrocarbons, and hydrogen

    Get PDF
    Efficient direct valorization of methane to value-added chemicals and materials remains an unsolved challenge for modern chemistry and materials science. In this work, we explored direct non-oxidative conversion of methane to hydrogen, hydrocarbons, and valuable zeolite-templated carbon materials. First, using a set of spectroscopy and microscopy characterization tools, we investigated how the reaction conditions influence the process of carbon formation inside the typical zeolite-based catalyst Mo/ZSM-5. Then, we explored the effect of the zeolite topology on the growth of carbon materials from methane decomposition over Mo/MFI, Mo/MOR, Mo/BEA, and Mo/FAU templates. Finally, we applied the obtained insights to prepare high-quality zeolite-templated carbons directly from methane using Fe/BEA and Fe/FAU templates. Altogether, our results represent a carbon-economic method of methane conversion to COx-free hydrogen gas, a mixture of light aliphatic and aromatic hydrocarbons, and valuable carbon materials

    Development of technique for testing the long-term stability of silicon microstrip detectors

    No full text
    An automatic multi-channel set-up prototype for simultaneous testing of the Long-Term Stability (LTS) * of more than ten detectors is described. The Inner Tracking System of the ALICE experiment will include about two thousand Double-Sided Microstrip Detectors (DSMD). Efficient automatic measurement techniques are crucial for the LTS test, because the corresponding test procedure should be performed on each detector and requires long times, at least two days. By using special adapters for supporting and connecting the bare DSMDs, failing detectors can be screened out before module assembly, thus minimizing the cost. Automated probe stations developed for a special purpose or for microelectronics industry are used for measuring physical static DSMD characteristics and check good-to-bad element ratio for DSMD. However, automated (or semi-automatic) test benches for studying LTS or testing DSMD long-term stability before developing a detecting module are absent.Важная часть тестирования детектора и процедура определения гарантии качества состоит в изучении долговременной стабильности основных характеристик (ДСХ) детекторов, включая исследование эффектов влияния окружающей среды, таких как влажность или температура. В данной работе описаны метод тестирования и автоматический многоканальный стенд, специально разработанный для одновременного тестирования ДСХ более чем десяти детекторовВажлива частина тестування детектора і процедури визначення гарантії якості складається у вивченні довгострокової стабільності основних характеристик (ДСХ) детекторів, включаючи дослідження ефектів впливу навколишнього середовища, таких як вологість або температура. У даній роботі описані метод тестування та автоматичний стенд, спеціально розроблений для одночасного тестування ДСХ більш ніж десяти детекторів

    On the Receptivity Process of Supersonic Laminar Boundary Layer

    No full text
    corecore