The effect of gas atmosphere used in the calcination of MgO on its basicity and catalytic performance in oxidative coupling of methane

Study on the unsteady state oxidative coupling of methane: effects of oxygen species from O2, surface lattice oxygen, and CO2 on the C2+ selectivity

“…38,51,52 For example, MgO or Sm 2 O 3based catalysts exhibited increased C 2+ selectivity with a low partial pressure of CO 2 . 32,53 Suppressed OCM activity with CO 2 has also been reported: Li/MgO was poisoned by CO 2 , 54 and Na 2 WO 4 /Mn/SiO 2 was deactivated by concentrated CO 2 . 38 Nevertheless, it may be possible to modify the OCM activity by using an appropriate amount of co-fed CO 2 as mild oxidant to replace the mixture of N 2 and O 2 .…”

Effects of alkaline-earth oxides on the performance of a CuO–ZrO2catalyst for methanol synthesis via CO2hydrogenation

“…19,36 Unfortunately, attempts at deconvolution of the TPD spectrum into three peaks were unsuccessful in this case. To facilitate discussion, CO 2 -TPD proles are roughly divided into three regions: 37,38 50-150 C, 150-240 C and > 240 C, which correspond to CO 2 desorption of weak, medium and strong site, respectively. The number of different base site was evaluated by calculating the integral of each region, and the data were summarized in Table 4.…”

Study of K/Mn‐MgO Supported Fe Catalysts with Fe(CO)5 and Fe(NO3)3 as Precursors for CO Hydrogenation to Light Alkenes

“…OH groups, O and O 2-). [24,25] Whereas in the case of the Fe-N catalyst, two peaks were observed in CO 2 -TPD profile below 420 ℃ and a new peak appeared at about 450 ℃. Here, the catalyst prepared by Fe(NO 3 ) 3 not only increased the strong basic sites but also generated very strong basic sites at higher temperature.…”