Enhanced Activity of Spinel-type Ga2O3–Al2O3 Mixed Oxide for the Dehydrogenation of Propane in the Presence of CO2

Abstract

Catalytic performance of a series of Ga 2 O 3 -Al 2 O 3 mixed oxides prepared by alcoholic-coprecipitation method for the dehydrogenation of propane in the presence of CO 2 was investigated. It is shown that the combination of Ga and Al oxides greatly improved the performance of the Ga 2 O 3 -based materials for catalytic dehydrogenation of propane, with the highest performance attainable at a Ga 2 O 3 -Al 2 O 3 catalyst with a 20 mol% aluminum content. While the same tendency was observed for the specific activity normalized by BET surface area, significantly enhanced stability was achieved for Ga 2 O 3 -Al 2 O 3 with higher aluminum content. X-ray diffraction (XRD) revealed that a homogeneous spinel-type Ga 2 O 3 -Al 2 O 3 solid solution is uniformly formed by substitution of Ga 3+ for Al 3+ in the Al 2 O 3 lattice. The enhanced activity of Ga 2 O 3 -Al 2 O 3 mixed oxides was accounted for by the abundance of surface weak acid sites due to the synergetic interaction between Ga 2 O 3 and Al 2 O 3 in the solid solution systems.

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

“…Many different catalysts were investigated in CO 2 -PDH containing Pt [3], Ni-Fe [4] Cr [5][6][7][8][9][10][11][12][13][14][15][16], Ga [17][18][19][20], In-Al [21][22][23], Fe [24] or V [25,26]. Among them, the chromium oxide-based materials are considered as a very promising for CO 2 -PDH due to high activity and selectivity.…”

Uncovering selective and active Ga surface sites in gallia–alumina mixed-oxide propane dehydrogenation catalysts by dynamic nuclear polarization surface enhanced NMR spectroscopy

“…15 times lower than the initial activity of (Ga,Al) 2 O 3(1 : 0) , and it showed a poor propene selectivity of 42%, consistent with previous reports. 30,53 No coke deposition could be detected in this material by TGA. While a higher activity of alumina for PDH was reported to require a high temperature CO pre-treatment, 16,18,54,55 such pre-treatment was not performed in the present work.…”

Supported Ga-oxide Catalyst for Dehydrogenation of Ethane

“…The structure of Ga, which is close to β-Ga2O3 in the Ga _ Al2O3 (1323c) catalyst and is near α-Ga2O3 when the catalyst calcined at 1573 K, affect the catalytic activity strongly. Some reports described that tetrahedral Ga shows high catalytic activity for dehydrogenation of propane 18),21), 22) . The shape of the XANES spectra (Fig.…”