The superior propylene yield of the In ₂ O ₃ -beta composite ( ca. 50%) for the conversion of ethanol to propylene compared to In ₂ O ₃ ( ca. 32%) is due to the fact that zeolite beta in the composite enhances the conversion of the intermediate of acetone to propylene via an additional pathway.

Promoted oxygen adsorption–desorption properties of smaller Rh₂O₃ nanoparticles supported on Zn-modified γ-Al₂O₃ result in a superior activity for N₂O decomposition.

The chromium oxide catalysts supported on silicalite-1 zeolite (Cr/S-1) with a Cr content between 0.5% and 7% were synthesized via an incipient wetness method. The catalysts were characterized by XRD, N₂ adsorption, TEM-EDX, UV-vis, DRIFTS, ²⁹Si MAS NMR, XPS, H₂-TPR, and NH₃-TPD. The optimum 3%Cr/S-1 catalyst with 3%Cr is more active and stable than SBA-15-supported one with the same Cr content, which is a consequence of a higher content of Cr⁶⁺ in the fresh 3%Cr/S-1 catalyst and a higher content of Cr⁶⁺ retained on the former catalyst during the reaction. The 3%Cr/S-1 catalyst affords an isobutane conversion of 36.5% with 71.2% isobutene selectivity. The catalytic activity is well correlated with the content of Cr⁶⁺ in the fresh catalysts. Carbon dioxide displays a promoting effect on the dehydrogenation reaction.

Dehydrogenation of ethane to ethylene was investigated in the presence of CO₂ over Au catalyst supported on an Mn-doped ceria nanorod. The activity can be greatly enhanced by proper Mn doping. Mn was found to preferentially occupy defect sites or surface sites of ceria, resulting in the formation of extra oxide ions. Characterization results indicated that the reducible oxygen species related to ceria might play a vital role in the dehydrogenation. The addition of CO₂ improved the stability of the catalysts remarkably, since CO₂ can sustainably replenish the reducible oxygen species and eliminate the coke on the surface of the catalysts, which was proved by the H₂-TPR and Raman analysis of spent catalysts. An ethane conversion of 17.4% with an ethylene selectivity of 97.5% can be obtained after 44 h of reaction.

A series of vanadia catalysts supported on SBA-15 (V/SBA) with a vanadia (V) content ranging from 1% to 11% were prepared by an incipient wetness method. Their catalytic behavior in the dehydrogenation of isobutane to isobutene with CO₂ was examined. The catalysts were characterized by N₂ adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and temperature-programmed reduction (TPR). It was found that these catalysts were effective for the dehydrogenation reaction, and the catalytic activity is correlated with the amount of dispersed vanadium species on the SBA-15 support. The 7% V/SBA catalyst shows the highest activity, which gives 40.8% isobutane conversion and 84.8% isobutene selectivity. The SBA-15-supported vanadia exhibits higher isobutane conversion and isobutene selectivity than the MCM-41-supported one.