Enhancement of CO2 Reforming of CH4 Reaction Using Ni,Pd,Pt/Mg1−xCex4+O and Ni/Mg1−xCex4+O Catalysts

Abstract

Catalysts Ni/Mg1−xCex4+O and Ni,Pd,Pt/Mg1−xCex4+O were developed using the co-precipitation–impregnation methods. Catalyst characterization took place using XRD, H2-TPR, XRF, XPS, Brunauer–Emmett–Teller (BET), TGA TEM, and FE-SEM. Testing the catalysts for the dry reforming of CH4 took place at temperatures of 700–900 °C. Findings from this study revealed a higher CH4 and CO2 conversion using the tri-metallic Ni,Pd,Pt/Mg1−xCex4+O catalyst in comparison with Ni monometallic systems in the whole temperature ranges. The catalyst Ni,Pd,Pt/Mg0.85Ce4+0.15O also reported an elevated activity level (CH4; 78%, and CO2; 90%) and an outstanding stability. Carbon deposition on spent catalysts was analyzed using TEM and Temperature programmed oxidation-mass spectroscopy (TPO-MS) following 200 h under an oxygen stream. The TEM and TPO-MS analysis results indicated a better anti-coking activity of the reduced catalyst along with a minimal concentration of platinum and palladium metals.

Rh promoted Ni over yttria–zirconia supported catalyst for hydrogen‐rich syngas production through dry reforming of methane

“…This peak is abbreviated to reducible free NiO species. 25 However, no such peak is observed after "H 2 -TPR-CO 2 -TPD-H 2 -TPR" cyclic treatment of Rh-promoted yttria-zirconia-supported Ni (5NixRh/YZr; x = 1, 4, 5) catalyst (Figures 4D,E and S4). These observations indicate that over yttria-zirconiasupported Ni catalyst, some portion of metallic Ni is oxidized into NiO under CO 2 stream whereas, over Rh promoted yttria-zirconia-supported Ni catalyst, catalytic active sites remain stabilized under CO 2 stream.…”

“…After successive “H 2 ‐TPR‐CO 2 ‐TPD‐H 2 ‐TPR” cyclic treatment of 5Ni/YZr catalyst, a small reducible peak at an early temperature (150°C) is observed (Figure 4C). This peak is abbreviated to reducible free NiO species 25 . However, no such peak is observed after “H 2 ‐TPR‐CO 2 ‐TPD‐H 2 ‐TPR” cyclic treatment of Rh‐promoted yttria–zirconia‐supported Ni (5Ni x Rh/YZr; x = 1, 4, 5) catalyst (Figures 4D,E and ).…”

Catalytic Dry-reforming of Methane Process with Co,Ni,Pd/Ca-La-O Mixed Oxides

“…According to the literature, the DRM reaction has been investigated over different materials such as exchanged zeolites [7], mixed oxides such as Al2O3, CeO2, La2O3, etc. [8,9], and supported noble metal catalysts (e.g., Ru, Rh, and Pt) with high stability and activity and less sensitivity to coke formation [10,11]. The major drawback when using noble materials is their high cost and limited availability, which markedly limit their applications on a large scale.…”