Comparative study of the two-zone fluidized-bed reactor and the fluidized-bed reactor for oxidative coupling of methane over Mn/Na2WO4/SiO2 catalyst

Glycerol steam reforming with low steam/glycerol ratio in a two-zone fluidized bed reactor

“…This device has been previously tested by our group for several reactions [8][9][10], showing that in many cases it is possible to achieve steady state operation under conditions where a conventional reactor would suffer catalyst deactivation. The use of a TZFBR has also been found to be beneficial for the oxidative coupling of methane by Talebizadeh et al [11] and for oxidative dehydrogenation of butane by Rischard et al [12] and has been proposed for glycerol dehydration to acrolein [13]. A scheme of a TZFBR is shown in Figure 1.…”

Numerical simulation of fixed bed reactor for oxidative coupling of methane over monolithic catalyst

“…No less than 100 o C of temperature gap is measured by researchers during OCM reaction over La 2 O 3 /CaO [10], Li/MgO [11], Mn-Na 2 WO 4 /SiO 2 and Mn-Na 2 WO 4 /MgO [12] catalysts. The hot spot is a decisive factor in the performance of reactor, which may lead to temperature runaway, catalyst deactivation and even thermal cracking of the main products [13]. To inhibit the formation of hot spots and improve the selectivity of product, the selection of reactor and the alteration of contact mode between reactant and catalysts function a lot apart from the exploration of highly selective catalysts.…”

“…Taniewski et al [11] show that successive active catalyst layers can be involved and a nearly unchanged overall selectivity is given during the process of CH 4 transformation over the bed by changing the feed inlet locations. Talebizadeh et al [13] study the OCM in a two-zone fluidized-bed reactor (TZFBR). In their work, diluted oxygen in argon is introduced into the bottom of the TZFBR, while methane is entered at higher positions along the fluidized bed.…”

Reactor material and gas dilution effects on the performance of miniplant-scale fluidized-bed reactors for oxidative coupling of methane

“…Table 1 highlights a summary of all main studies that have been done with fluidized-bed reactors on OCM. Only Wang et al [6] and Talebizadeh et al [14] reported working with the Na 2 WO 4 -Mn/SiO 2 catalyst in fluidized-bed reactors before, but these studies did not aim at optimizing reaction parameters such as temperature and feed composition. It is important to mention that the reactor scale described in literatures of OCM fluidized-bed reactors using Na-Mn-W/SiO 2 catalytic system so far are smaller than in this study (1200 ml reactor of this study).…”