Methanol/dimethyl ether to light olefins over SAPO-34: Comprehensive comparison of the products distribution and catalyst performance

Benzene co-reaction with methanol and dimethyl ether over zeolite and zeotype catalysts: Evidence of parallel reaction paths to toluene and diphenylmethane

“…Even though DME and methanol are often considered as similar reactants, these results suggest that there are important differences between the two compounds with respect to the deactivation of MTH catalysts. catalysts in the MTO process [174][175][176]251], even though some reports provide evidence for slightly higher stability provided by DME feeds, which is in agreement with our findings on H-SAPO-5. In order to further assess the contribution of the feed to catalyst deactivation, we employed a simple deactivation model, combining previous models described in [81,162].…”

“…Interestingly, deactivation of these materials does not show a moving reaction front, but is more homogeneous along the catalyst bed, as illustrated in Figure 2.7 (right) [81,161]. Importantly, a few studies have attempted to compare methanol and DME as MTH feedstocks and their effect on catalyst deactivation [174][175][176]. It has been observed that DME is converted to hydrocarbons more slowly over H-SAPO-34 compared to methanol.…”

“…Correspondingly, this slower build-up of hydrocarbons in the confinements of the pores and cavities of H-SAPO-34 was suggested to be the cause for the slower deactivation rates observed for DME feed as compared to methanol feed [174][175][176]. For H-ZSM-5, it has been reported that DME is converted to hydrocarbon more quickly than methanol, but there has not yet been a thorough deactivation study comparing both oxygenates [47,105].…”

Nature and Location of Carbonaceous Species in a Composite HZSM-5 Zeolite Catalyst during the Conversion of Dimethyl Ether into Light Olefins

“…This weakened thermodynamic limitation also favors the enhancement of CO 2 co-fed with the syngas [5,6]. Secondly, reactor operability is simpler in the DTO process than in the MTO due to the elimination of the exothermic step of methanol dehydration [7]. These benefits have motivated the Lurgi process (dehydration of methanol and on-line conversion of the product stream to light olefins) [8].…”

Conversion of natural gas and gas liquids to methanol, other oxygenates, gasoline components, olefins and other petrochemicals: A collection of published research (2010–2015)

“…These results led to the conclusion that SAPO-34 catalysts prepared with a mixed template of TEAOH/Morpholine exhibited better catalytic performance in MTO reactions compared to catalysts prepared using single-template methods. Ghavipour et al (2014) compared the products distribution and SAPO-34 catalyst performance in the conversion of methanol and dimethyl ether (DME) to light olefins. The SAPO-34 catalyst used in the comparison was synthesized at 400 to 460 o C. The product distributions were measured as a function of time on stream and reaction temperature.…”