Effect of support composition on the origin and reactivity of carbon formed during dry reforming of methane over 5wt% Ni/Ce1−xMxO2−δ (M=Zr4+, Pr3+) catalysts

Zirconium‐Assisted Activation of Palladium To Boost Syngas Production by Methane Dry Reforming

“…Empirical attempts to control coking of,f or example,N i by specifically active supports such as CeZrO x [5,29] seem to make use of this principle.F aster C-depletion of the metallic component via an accelerated phase boundary reaction can directly lower the Cc oncentration of the metal particles and thus initially disfavor nucleation and growth of graphite-type C-species,b ut also enhance the relative amount of redissolution of the latter in the metal as C bulk under stationary reaction conditions.T his scenario provides as olid basis for directional promotion of microkinetic steps leading both to enhanced activity and improved control of carbon chemistry during DRM. Important implications for knowledge-based DRM catalyst synthesis,atleast if C-dissolving metals such as Ni and Pd are involved, are:1 )optimization of phase boundary dimensions and CO 2 activation properties of the Scheme 1.…”

Development of Co Supported on Co−Al Spinel Catalysts from Exsolution of Amorphous Co−Al Oxides for Carbon Dioxide Reforming of Methane

“…Reduced Co‐10 and Co‐15 showed negligible mass loss, which can be translated into negligible carbon deposits. Meanwhile, reduced Co‐20, Co‐30, and Co‐15(24 h) experienced major weight loss between 400 and 575 °C, which is attributed to the oxidation of structured carbon (mainly carbon nanotubes and nanofilaments) . As measured, average rate of carbon deposition of the catalysts (6 h reaction time) increased from 0.96 to 72.21 mg g cat −1 h −1 with increasing Co loading.…”

“…Meanwhile, reduced Co-20, Co-30, and Co-15(24 h) experienced major weight loss between 400 and 575°C, which is attributed to the oxidation of structured carbon (mainly carbon nanotubes and nanofilaments). [80,90] As measured, average rate of carbon deposition of the catalysts (6 h reaction time) increased from 0.96 to 72.21 mg g cat À 1 h À 1 with increasing Co loading. The results are correlated with the size of Co particles as larger Co particles produce higher carbon deposits.…”

Dry Reforming of Shale Gas and Carbon Dioxide with Ni‐Ce‐Al2O3 Catalyst: Syngas Production Enhanced over Ni‐CeOx Formation

“…The TGA result indicates a good consistent with the catalytic performance of the six catalysts. The catalyst 5Ni‐5Ce performed the best carbon resistance characteristic, which is due to the formation of Ce 4+ /Ce 3+ reducible couples and oxygen vacancy thus offering exciting opportunities to active CH x intermediates and remove carbon deposition ,. In order to furtherly understand the catalytic mechanism, the structural characterization analysis of the catalysts was investigated by N 2 ‐adsorption/desorption, X‐Ray Diffraction (XRD), Raman spectroscopy (Raman), CO 2 ‐Temperature programmed desorption (CO 2 ‐TPD) and X‐ray photoelectron spectroscopy (XPS) as follows.…”