Preparation of Ni-CeO2/MgAl hydrotalcite-like catalyst for biogas oxidative steam reforming


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Özcan M. D. , Özcan O. , Kibar M. E. , Akın A. N.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, cilt.34, ss.1128-1142, 2019 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 34 Konu: 3
  • Basım Tarihi: 2019
  • Doi Numarası: 10.17341/gazimmfd.460508
  • Dergi Adı: JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Sayfa Sayıları: ss.1128-1142

Özet

In this work, it is aimed to develop new and active catalyst for oxidative steam reforming of biogas to produce syngas. For this purpose, Ni-CeO2/MgAl hydrotalcite-like catalysts which are not used in the oxidative steam reforming of biogas before were prepared with different cerium (Ce) contents (wt % 2.5/5.0/7.5/10.0) and Mg: Al molar ratios (1:1, 2:1, 3:1) and fixed nickel (Ni) content (wt % 10). While hydrotalcite-like support metarials were prepared by co-precipitation method, nickel and cerium loadings were carried out by using wet impregnation method. Structural and textural properties of the catalysts were determined by X-ray diffraction (XRD), Brunauer Emmett Teller (BET), inductively coupled plasma optical emission spectrometry (ICP-OES) and Scanning Elektron Microscope (SEM) analyzes. Biogas oxidative steam reforming reactions were performed in a fixed-bed quartz reactor at 800 degrees C under atmospheric pressure. All catalysts were studied under the reaction conditions of the feed gas molar ratios of CH4/CO2/O-2/H2O = 1.0/0.67/0.1/0.3 and space velocity of 45000 ml/gcat. h. The highest catalytic activity was obtained with Ni10Ce2.5/MgAl(2:1) hydrotalcite-like catalyst with CH4 conversion of 96%, CO2 conversion of 82%, H-2 yield of 92% and H-2/CO molar ratio of 1.57.