RAIRS and TPD study of CO and NO on β-Mo2C

Effect of carburization protocols on molybdenum carbide synthesis and study on its performance in CO hydrogenation

“…Besides, the CO-TPD spectrum of 20% Mo 2 C/Al 2 O 3 displayed two CO desorption peaks at −63 and 77 • C which were assigned to the adsorption on support and molecularly bonded CO on Mo 2 C, respectively [51]. A carbide foil of Mo 2 C cleaned by thermal annealing showed a weak recombinative desorption of dissociated CO at approximately 927 • C and a molecular desorption of CO at 52 • C [52]. Therefore, in the present work, CO desorption peaks between −63 and 127 • C were assigned to molecularly bounded CO on Mo 2 C. The situation was complex for the desorption peak higher than 550 • C, which may be assigned to the recombinative CO desorption or decomposition of molybdenum carbide.…”

Temperature-programmed desorption and surface reaction studies of CO on Co2C

“…AH and BH probably originate from other species after Co2C decomposition. C source molecules are likely to remain in the metal carbide lattice after preparation as undissociated/dissociated molecules, similarly to nitrogen source molecules in metal nitrides [23,24]. Figure 4(a) shows that the lattice C content probably approaches the maximum value of 9.24%, as carburization time progresses.…”

Development of a Catalytic Cycle in Molybdenum Carbide Catalyzed NO/CO Reaction

“…Figure 2 shows the changes in the XRD patterns of the Mo 2 C sample during the heating treatment in He. On heating Mo 2 C sample 20 40 60 80 100…”

“…For example, these materials show good catalytic activities in carbon monoxide hydrogenation [13], ammonia synthesis [14], and methane reforming [15,16] as well as in hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) reactions [17][18][19]. It has been reported that low-temperature N 2 O and N 2 desorption features were observed in NO-TPD study of Mo 2 C [20]. Zhang et al [21] also reported the decomposition of NO on carbide-modified Mo surfaces, where Mo was epitaxially grown on the W (111) substrate through physical vapor deposition.…”