Tuning the composition of metastable Co Ni Mg100−−(OH)(OCH3) nanoplates for optimizing robust methane dry reforming catalyst

Toward highly efficient in situ dry reforming of H2S contaminated methane in solid oxide fuel cells via incorporating a coke/sulfur resistant bimetallic catalyst layer

“…decreased as a function of time in sweet CH 4 -CO 2 , presumably due to coke formation. 17,18 Such degradation was suppressed on the poisoned catalyst. Under EDRM conditions when TA-SOFC was biased at 1.5 A cm À2 (50 ppm H 2 S contained CH 4 -CO 2 ), the output voltage was stable at $0.68 V whereas the corresponding power density attained 1.02 W cm À2 during the entire 48 h test (see Fig.…”

“…Unfortunately, the practical implementation of DRM still faces several technical challenges: [12][13][14][15][16][17][18][19][20][21][22] the rst one is coke formation which deactivates almost every type of commercial catalyst for DRM (e.g., Ni). [13][14][15][16][17] DRM is thermodynamically more prone to coking than other reforming reactions, albeit abundant achievements have been made regarding the development of coke-resistant catalysts, e.g., Ni and its alloys, during the past decades.…”

A Review on Bimetallic Nickel‐Based Catalysts for CO2 Reforming of Methane

“…Although a ca. 10 % conversion drop took place within first 100 h, this catalyst showed stable activity from then until the end of test, with only 1.79 wt % carbon formation …”

“…CO 2 pulse injection reveled that a fraction of Co 0 of Co/γ‐Al 2 O 3 catalysts was oxidized by CO 2 to Co‐O, which was reduced again to Co 0 by carbon species originating from CH 4 dissociation, thereby generating a dynamic redox process . Hence, the presence of Co enhances the adsorption of CO 2 due to the strong Co‐O interaction, which helps to inhibit the deposition of carbon by enhancing carbon removal . In return, Ni helps to prevent Co from oxidizing .…”

Mechanistic Insights for Dry Reforming of Methane on Cu/Ni Bimetallic Catalysts: DFT-Assisted Microkinetic Analysis for Coke Resistance

“…Then, the activation energy in the first step of CH 4 dissociation is found to be 1.30 eV, as shown in Figure 2. The first transition state shows the detached H atom located at the HCP site [33], and the remaining CH 3 fragment settled down at 2.08 Å to achieve maximum C-H-Ni three-center bonding [34,35] After the dissociative adsorption of CH 4 on the Ni 2 Cu (111) surface, the two subsequent dehydrogenation steps of CH 3 * and CH 2 * species are more facile with energy barriers of 0.75 eV and 0.49 eV, respectively. However, CH 3 * dehydrogenation showed endothermicity of 0.33 eV, while CH 2 * exhibited exothermicity by −0.06 eV.…”