Reactions of ethane with CO2 over supported Au

Abstract

Reaction of C 2 H 6 with CO 2 Au catalyst Effects of supports Electronic interaction between Au and oxides a b s t r a c tThe dehydrogenation of C 2 H 6 and its reaction with CO 2 have been investigated on Au deposited on various oxides. Both reactions occurred at relatively high temperatures, above 650 K. Ethylene formed in the dehydrogenation process with high selectivity, 94-98%, on most of the catalysts. The conversion of C 2 H 6 varied with the nature of support and fell in the range of 3-19%. Adding CO 2 to C 2 H 6 only slightly influenced the reaction of C 2 H 6 on Au/MgO and Au/Al 2 O 3 , but markedly increased the conversion of C 2 H 6 and changed its reaction pathways on Au deposited on n-type TiO 2 , CeO 2 and ZnO. Taking into account the properties of these oxides, we came to the conclusion that their electric behavior and not their defect structure play a dominant role in the enhanced activity of Au deposited on these supports. Based on the different work functions, an electronic interaction between Au particles and these oxides is proposed, which facilitates the formation of reactive negatively charged CO 2 .

Reactions of propane with CO2 over Au catalysts

“…As was discovered by several decades ago, Au in nanosize exhibits a surprisingly high activity in many catalytic reactions [16][17][18]. Recently, we found that Au nanoparticles supported by n-type semiconducting oxides are very effective catalysts in the reaction of C 2 H 6 with CO 2 [19].…”

“…It has been demonstrated in several studies that negatively charged CO 2 is much more reactive than the neutral one [28,29]. Recently, it was reported that n-type oxidic supports for Au are much more efficient in the reaction between CO 2 and C 2 H 6 compared to Au samples deposited on insulating oxides [19].…”

Mn-doped CeO2 Nanorod Supported Au Catalysts for Dehydrogenation of Ethane with CO2

“…Nevertheless, these kinds of catalysts are still limited by the drawbacks of environmental hostility, relatively low selectivity or poor long-term stability. Recently, the reaction between ethane/propane and CO 2 has been studied on Au-based catalysts [12,13]. Dry reforming as well as oxidative dehydrogenation can occur over these supported Au catalysts.…”

Effects of H 2 O on the thermal and photocatalytic reactions of ethane on supported Au

“…The photocatalytic reaction was followed in the same way as described in our previous paper [7]. The reactor was equipped with a 500 W medium pressure mercury vapor lamp (TQ 718, Heraeus Noble light, Germany) as a light source.…”

“…of dimethyl ether [16], in the reaction of ethane with CO 2 [7], in the hydrogenation of CO 2 [20], and in the production of H 2 in the photocatalytic reactions of ethane [15].…”