Promotional Effect of Cr in Sulfated Zirconia‐Based Mo Catalyst for Methane Dehydroaromatization

Abstract

The need for valuable hydrocarbons is now at its peak. Methane is an abundant source of natural gas, and is well‐studied as a feedstock for producing heavier hydrocarbons of higher value. A number of processes are well‐studied, including methane dehydroaromatization (MDHA). This is a direct methane conversion process, eliminating the need for a syngas step while producing both benzene and hydrogen.

Understanding the Impact of Hydrogen Activation by SrCe0.8Zr0.2O3−δ Perovskite Membrane Material on Direct Non-Oxidative Methane Conversion

“…The low-temperature peak could be described as amorphous and oxidized “soft” coke, the medium-temperature peak to polymeric aromatic carbon, and the high-temperature peak to the ordered, graphitic “hard” coke. The formation of diverse carbon species in the DNMC reaction has been observed in Mo/ZSM-5 ( Liu H. et al, 2002 ; Ma et al, 2002 ; Song et al, 2014 ) and metal/sulfated zirconia catalysts ( Abedin et al, 2019 ; Abedin et al, 2019 ; Kanitkar et al, 2019 ) as well as in methane pyrolysis in the absence of any catalyst ( Gueret et al, 1995 ; Vander Wal et al, 2018 ; Singh et al, 2019 ; Wang et al, 2019 ). The H 2 co-fed DNMC condition in the presence of SCZO oxide apparently leads to an obvious increase in the soft coke on the Fe/SiO 2 catalyst, resulting in active DNMC reaction without obvious methane conversion drop or high coke selectivity.…”

Recent advances in heterogeneous catalysis for the nonoxidative conversion of methane

“…8 Among all these metal promoters, Fe, Mg, Cr, Co, Ni and K have been widely studied and have shown an improved catalytic activity, stability, and selectivity to aromatics. 10,[47][48][49] Recent studies indicate that the promoters are benecial for increasing the amount of active Mo species and reducing the formation of coke in zeolite channels, thus enhancing the catalytic performance for CH 4 conversion.…”

Direct conversion of methane to C2 hydrocarbons using W supported on sulfated zirconia solid acid catalyst

“…Although silica and alumina have been reported as strong non-reducible catalyst supports [30,31], recent studies have revealed zirconium oxides to demonstrate higher strength in working conditions [32]. It has been reported that the sulfurized form of ZrO 2 known as sulfated zirconia (SZ), actively helps the active metal sites to stabilize on the oxide support at a greater degree [29,33]. SZ is a well-known solid acid possessing surface H + ions [29,34], which can react with some of the excess methyl radicals and remove these in the form of benzene and heavier hydrocarbons as valuable side products [15,35].…”