Effect of V2O5 promoter on characteristics and performance of NiO/CeO2 catalyst in methane bi-reforming. (23rd November 2020)

• Record Type: Journal Article
• Authors: Phuong, Phan Hong; Cam Loc, Luu; Tri, Nguyen; Van, Nguyen Thi Thuy; Anh, Nguyen Phung; Duy, Nguyen Phuc Hoang; Cuong, Hoang Tien
• Is Part Of: Advances in natural sciences. Volume 11:Number 4(2020)
• Publication Date: 2020-11-23
• Subjects: V2O5 promoter -- NiO/CeO2 catalyst -- methane -- bireforming -- coke resistance; 2.03 -- 4.02 -- 5.06; Nanotechnology -- Periodicals; Nanoscience -- Periodicals; 620.5
• DOI: 10.1088/2043-6254/abc949
• Languages: English
• ISSNs: 2043-6254

Abstract

Abstract: In this work, a series of 10 wt% NiO/CeO2 catalysts (Ni/Ce) promoted by V2 O5 with content varying in the range of 0–0.5 wt% was prepared by the co-impregnation method. The characteristics of the catalysts were investigated by several techniques including N2 physisorption (BET), X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), EDS mapping, carbon dioxide temperature-programmed desorption (CO2 -TPD), and hydrogen temperature-programmed reduction (H2 -TPR). The activity of the catalyst was studied in the micro-flow system in a temperature range of 550 °C–800 °C, the feedstock composition CH4 /CO2 /H2 O of 3.0/1.2/2.4 and the weight hourly space velocity (WHSV) of 30, 000 ml.h −1 .g −1 . Adding V2 O5 additive, on the one hand increases the reducibility and basicity of Ni/Ce catalyst, on the other hand reduces oxygen vacancies and increases the crystal size of CeO2, leading to various effects on catalyst activity depending on its content. Ni/Ce catalyst promoted with 0.3 wt% of V2 O5 was the best among tested ones, on which at reaction temperature of 700 °C, the conversion of CH4 and CO2 reached 97% and 77% respectively, and the molar ratio of H2 /CO was 2.1. Meanwhile, on non-promoted Ni/Ce catalyst, the corresponding quantities were 83%, 62% and 1.9, respectively. It is important to note that performance of both was stable for more than 30 h thanks to the better resistance to coke deposition and structural stability.