Ni(0) Ex‐Phyllosilicates as Efficient and Stable Low Temperature CH₄ Dry Reforming Catalyst

Abstract

This study explores the performances of nickel-based materials for the dry reforming of methane (DRM), an important process for hydrogen and syngas productions. Ni nanoparticles are issued from porous phyllosilicate phase exolution under reducing conditions (in situ or ex situ). Phyllosilicate precursors were obtained by deposition/precipitation with urea onto SBA-15 porous silica, with metal loading up to 40 wt.%. Reaction was performed at 600-700 °C. The successful formation and stabilization of highly dispersed nanoparticles (2-6 nm) is revealed, even for highly loaded formulations (20 wt.% and 40 wt.%).In DRM-700 (CH 4 /CO 2 = 1, 20 % CH 4 , 480,000 mL g cat À 1 h À 1 ) the formulation at 20 wt.% metal loading (Ni_20 %) activated during reaction affords 50 % and 65 % of CH 4 and CO 2 conversions respectively at 700 °C. Ni_20 % is showing excellent resistance toward sintering after DRM stability test of 80 h. Characterizations made for spent catalyst show high resistance toward sintering and limited carbon formation.

Solid solution-type Sm–Pr–O supported nickel-based catalysts for auto-thermal reforming of acetic acid: the role of Pr in solid solution

“…6 CH 3 COOH + 1.4H 2 O + 0.28O 2 -2CO 2 + 3.44H 2 DH 0 = 0 (1) Ni-based catalysts are known for their high reactivity in activating C-C and C-H bonds, and are widely applied in catalytic reforming processes. 7,8 Nevertheless, HAc-derived intermediate species in ATR, such as CH x * (x = 0-3), are prone to carbon deposition. 9 In addition, harsh reaction conditions, e.g, the high local temperature environment (Z1000 1C) and oxidizing atmosphere in the upper catalyst bed during the ATR process, bring about issues of sintering and/or oxidation of Ni 0 species.…”