Ru/CNTs-Al2O3氨合成催化剂的制备与表征

doi:10.3866/PKU.WHXB20110812

Abstract

Abstract:

The purification treatment of carbon nanotubes-alumina was carried out using various oxidizers (ox), such as H₂O₂, concentrated HNO₃, and air. The obtained composite was used as support for ruthenium catalysts. The structures and properties of the products before and after modification were characterized and measured using transmission electron microscopy (TEM), thermogravimetric analysis (TG), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. The results show that purification modification treatment can remove the impurities on the surface of the CNTs-alumina, shorten the CNTs, and increase the amounts of hydroxyl, carboxyl, and carbonyl groups. Inductively coupled plasma (ICP) analysis shows that the dissolution solution composition of the CNTs-alumina composite supports with HNO₃ oxidation treatment contains 49.98 mg·g^-1 Al. The ammonia synthesis rate of the Ru/CNTs-alumina-H₂O₂ was found to be 39.8 mmol·g^-1·h^-1 at 10 MPa, 10000 h^-1, and 425 °C, which was higher than those for other CNTs-alumina-ox supported Ru catalysts.

Key words: Oxidizer, Carbon nanotube, Alumina, Ammonia synthesis, Ruthenium

MSC2000:

O643

LIN Jian-Xin, WANG Guo-Hua, WANG Rong, LIN Bing-Yu, NI Jun, WEI Ke-Mei. Preparation and Characterization of Ru/CNTs-Al₂O₃ Catalyst for Ammonia Synthesis[J].Acta Phys. -Chim. Sin., 2011, 27(08): 1961-1967.

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Preparation and Characterization of Ru/CNTs-Al₂O₃ Catalyst for Ammonia Synthesis

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Preparation and Characterization of Ru/CNTs-Al₂O₃ Catalyst for Ammonia Synthesis