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Room Temperature Adsorptive Removal of Thiophene over Zinc Oxide-Based Adsorbents

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Abstract

This study investigated the room temperature adsorptive removal of thiophene over zinc oxide adsorbents in the presence of hydrogen. The bulk zinc oxide was prepared by precipitation method and calcined at different temperatures in the range of 300-550 °C. Supported zinc oxide was prepared by co-precipitation of 30 wt.% ZnO with alumina and calcined at 550 °C. Properties of the adsorbents were determined by various characterization techniques such as surface area and pore volume analysis, XRD, FESEM, EDX and TPR. The desulfurization process was carried out in a down-flow packed bed reactor at room temperature (30 °C). The BET surface area of bulk zinc oxide adsorbents decreased with the increase in calcination temperature from 300 to 550 °C. The surface area of bulk zinc oxide adsorbents was 30.5 and 14.6 m2/g when calcined at 300 and 550 °C, respectively. The surface are of supported zinc oxide adsorbents was 177 m2/g. The highest average pore size was obtained for bulk ZnO calcined at 550 °C (45 nm) compared to that calcined at 300 °C (42 nm) and supported ZnO (27 nm). The XRD peaks corresponded to the hexagonal structure of zinc oxide. The removal of thiophene was most significant for bulk ZnO calcined at 550 °C. The higher removal efficiency for this adsorbent in spite of lower surface area may be attributed to its higher percentage of larger pores and higher average pore size.

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Correspondence to Mahuya De.

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This article is an invited paper selected from presentations at “ICETINN-2017, International Conference on Emerging Trends in Nanoscience and Nanotechnology,” held March 16-18, 2017, in Majitar, Sikkim, India, and has been expanded from the original presentation.

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Singh, S.B., De, M. Room Temperature Adsorptive Removal of Thiophene over Zinc Oxide-Based Adsorbents. J. of Materi Eng and Perform 27, 2661–2667 (2018). https://doi.org/10.1007/s11665-018-3192-2

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  • DOI: https://doi.org/10.1007/s11665-018-3192-2

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