Effect of dealumination on the catalytic performance of Cr-containing Beta zeolite in carbon dioxide assisted propane dehydrogenation

Abstract

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Recent Advances on Gallium-Modified ZSM-5 for Conversion of Light Hydrocarbons

“…In recent years, considerable research was applied for the development of novel and efficient catalysts and protocols for dehydrogenation and dehydroaromatization of light alkanes for the production of olefins and aromatics that are of higher economic value as feedstock to satisfy the growing need of chemical industry [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. Catalytic dehydrogenation of alkanes is also proposed as the possible route for production of olefins with high selectivity, and thus, has the superiority over other technologies such as thermal cracking and stream cracking [ 13 ].…”

“…A variety of catalysts, such as Pt [ 16 , 17 ], CrO x [ 11 , 18 ], MoC x O x [ 19 , 20 , 21 ], amorphous carbon and carbon nanotubes [ 22 , 23 , 24 ], Ga oxide [ 25 , 26 ], etc., were found effective for non-oxidative dehydrogenation of light hydrocarbons. In Pt based bi-functional catalysts, Pt is the reaction species for dehydrogenation, while the acid sites of support account for isomerization and cyclization reactions.…”

Research progress of CO2 oxidative dehydrogenation of propane to propylene over Cr-free metal catalysts

“…In terms of redox metal catalysts (e.g., Cr-, V-, Ce-, and Mo-based catalysts), CO 2 can be used as a soft oxidant to maintain the high valence state of the active sites at reaction atmosphere to benefit the dehydrogenation of propane to propylene and enhance the stability of catalysts [67,83,156]. It is generally believed that the redox metal catalysts follow the MvK mechanism in the CO 2 -ODHP reaction.…”

Synthesizing High‐Volume Chemicals from CO2 without Direct H2 Input

“…[111] Experimentally, the surface acidity of the supports can be controlled by (i) mixing insoluble or partially insoluble oxides of different acidities, such as SnO 2 -ZrO , [112] TiO 2 -ZrO 2 , [107] and TiO 2 -Al 2 O 3 , [108] (ii) preparing mixed oxide solid solutions, such as Ce x Zr 1-x O 2 , [113] and (iii) changing the Si/Al ratio of zeolitetype supports. [109,114] It is possible, albeit inconclusive, that surface acidity also determines the reaction mechanism. For example, CrO x /γ-Al 2 O 3 reportedly favors the DDH + RWGS mechanism during CO 2 -ODHE, [115] whereas Zr-and Ce-doped CrO x / SiO 2 and CrO x /ZrO 2 favor the redox mechanism during CO 2 -ODHE [116] and CO 2 -ODHP, [117] respectively, as depicted in Figure 6a and b.…”

“…Controlling the surface acidity is also crucial to suppress side reactions, such as reforming and coking [111] . Experimentally, the surface acidity of the supports can be controlled by (i) mixing insoluble or partially insoluble oxides of different acidities, such as SnO 2 ‐ZrO 2 , [112] TiO 2 ‐ZrO 2 , [107] and TiO 2 ‐Al 2 O 3 , [108] (ii) preparing mixed oxide solid solutions, such as Ce x Zr 1‐ x O 2 , [113] and (iii) changing the Si/Al ratio of zeolite‐type supports [109,114] . It is possible, albeit inconclusive, that surface acidity also determines the reaction mechanism.…”