Nanocrystal H[Fe, Al]ZSM-5 zeolites with different silica-alumina composition for conversion of dimethyl ether to gasoline

Direct Synthesis of C5–C13 iso-Paraffins from Carbon Dioxide over Hybrid Catalyst in a Near-Critical n-Hexane Fluid

“…The transformation of methanol and DME to hydrocarbons strongly depends on the acid properties of zeolite catalysts. 33 ZSM-5 catalysts with SiO 2 /Al 2 O 3 molar ratios of 23 and 80 were used to prepare the hybrid catalysts for comparing their catalytic activities. The NH 3 -TPD profiles of ZSM-5 zeolites in Figure 5 show two large peaks: a peak derived from physisorbed NH 3 appeared at around 500 K and the other peak attributed to NH 3 desorbed from acid sites appeared at around 700 K, regardless of the SiO 2 /Al 2 O 3 molar ratio.…”

“…Multifunctional active components could be produced from the desired catalyst for conducting hydrogenation of CO 2 to C 5+ hydrocarbons because it involves CO 2 activation and sequential formation of C–C bond reactions. , It is well known that methanol and DME can be catalytically synthesized from CO 2 and H 2 over Cu–ZnO-based catalyst, but these reactions exhibit low CO 2 conversions because of the thermodynamic limitation. , However, large hydrocarbon molecules such as gasoline fractions can be selectively produced from methanol and DME over zeolite catalysts with relatively high conversion. − In addition, equilibrium calculation also confirms that production of large hydrocarbon molecules favors significant improvement of CO 2 conversion compared to that of methanol and DME. For example, in Figure , the CO 2 conversion for methanol (Reaction ), DME (Reaction ), and n -hexane (Reaction ) at 553 K under 3.0 MPa are shown to be 13.2, 20.2, and 90.7%, respectively.…”

Experimental and Model Study on Raw Biomass Gasification Syngas Conditioning in a Molten NaOH-Na2CO3 Mixture

“…According to the literature [1][2][3][4], gas with 35.25% CO, 31.45% CO 2 , and 33.30% H 2 (H 2 /CO at 0.94) was used as the sample raw syngas for biomass (including solid waste) gasification by ignoring trace gases, such as H 2 S, NH 3 , and other content that might exist in real raw syngas. The cylinder gas, which remained stable in terms of gas content and pressure, was used as a simulant gas source.…”

“…As renewable energy sources are playing more important roles in global energy production, much work is focused on biomass (including solid waste), the only source of renewable energy that has the potential to replace fossil fuel. The typical gasification and pyrolysis temperatures of biomass and solid waste range between 700 • C and 900 • C [1][2][3][4]. The produced raw syngas has a temperature of 400-600 • C; a relatively low H 2 /CO ratio, which is usually less 1.0; and a high CO 2 content.…”

Synthesis of MeOH and DME From CO2 Hydrogenation Over Commercial and Modified Catalysts

“…Among the chemicals obtained from methanol, DME has the potential to be deployed as a fuel due to its physicochemical properties. Not only is it similar to liquefied petroleum gas (LPG) with low emissions of NOx, SOx, and particulates (Arcoumanis et al, 2008;Kim et al, 2008;Marchionna et al, 2008;Bonura et al, 2017;Ateka et al, 2018), but it is also an important chemical intermediate in the production of light olefins and gasoline (Li et al, 2019;Magomedova et al, 2019). DME production from CO 2 occurs in two steps: first, methanol is obtained from CO 2 hydrogenation and then it is dehydrated to DME (An et al, 2008;Ateka et al, 2017).…”