TY - JOUR
T1 - Binary Cr-Mo oxide catalysts supported on MgO-coated polyhedral three-dimensional mesoporous SBA-16 for the oxidative dehydrogenation of iso-butane
AU - Zhang, Lei
AU - Deng, Jiguang
AU - Dai, Hongxing
AU - Au, Chak Tong
N1 - Funding Information:
The work described above was supported by Hong Kong Baptist University (FRG/06-07/II-10). The research activities conducted in BJUT were financed by the NSF of China (Grant No. 20473006), SRF for ROCS (State Education Ministry of China), and PHR (IHLB) (Beijing Municipality).
PY - 2009/2/15
Y1 - 2009/2/15
N2 - Binary Cr-Mo oxide catalysts (denoted as Cr(x)Mo(y), x/y = nominal Cr/Mo molar ratio) supported on MgO-coated polyhedral three-dimensional (3D) mesoporous SBA-16 (MS) were fabricated for the oxidative dehydrogenation of iso-butane. The materials were characterized by a number of techniques for the establishment of the relationships between physicochemical properties and catalytic performance. The use of high-surface-area 3D MS as support for Cr-Mo oxide catalysts leads to increases of catalytic activity and of selectivity to iso-butene. The Cr(x)Mo(y) catalysts show higher iso-butene yield than the Cr/MS or Mo/MS catalyst. Under the conditions of iso-butane/O2 molar ratio = 1/2, space velocity = 30,000 mL/(g h), and reaction temperature = 540 °C, maximal iso-butene yield of 7.5% (iso-butane conversion = 10.0% and iso-butene selectivity = 75.0%) can be achieved over the Cr3Mo1 catalyst. Based on the results of characterization and activity evaluation, we conclude that the excellent catalytic performance can be attributed to the moderate basicity, good dispersion of CrOx and MoOx, high Cr6+ content, and high initial H2 consumption rate of Cr3Mo1.
AB - Binary Cr-Mo oxide catalysts (denoted as Cr(x)Mo(y), x/y = nominal Cr/Mo molar ratio) supported on MgO-coated polyhedral three-dimensional (3D) mesoporous SBA-16 (MS) were fabricated for the oxidative dehydrogenation of iso-butane. The materials were characterized by a number of techniques for the establishment of the relationships between physicochemical properties and catalytic performance. The use of high-surface-area 3D MS as support for Cr-Mo oxide catalysts leads to increases of catalytic activity and of selectivity to iso-butene. The Cr(x)Mo(y) catalysts show higher iso-butene yield than the Cr/MS or Mo/MS catalyst. Under the conditions of iso-butane/O2 molar ratio = 1/2, space velocity = 30,000 mL/(g h), and reaction temperature = 540 °C, maximal iso-butene yield of 7.5% (iso-butane conversion = 10.0% and iso-butene selectivity = 75.0%) can be achieved over the Cr3Mo1 catalyst. Based on the results of characterization and activity evaluation, we conclude that the excellent catalytic performance can be attributed to the moderate basicity, good dispersion of CrOx and MoOx, high Cr6+ content, and high initial H2 consumption rate of Cr3Mo1.
KW - iso-Butane oxidative dehydrogenation
KW - MgO-coated mesoporous silica
KW - Supported binary Cr-Mo oxide catalyst
KW - Three-dimensional polyhedral SBA-16
UR - http://www.scopus.com/inward/record.url?scp=58249140052&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2008.11.009
DO - 10.1016/j.apcata.2008.11.009
M3 - Journal article
AN - SCOPUS:58249140052
SN - 0926-860X
VL - 354
SP - 72
EP - 81
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
IS - 1-2
ER -