Deoxygenation of heptanoic acid, a model compound, over bimetallic cobalt (Co-Pt, Co-Au, Co-Pd, Co-Ru) supported silica catalysts, was examined for α-olefin production. The catalysts were prepared by conventional impregnation of the metal precursors on silica and characterized by XRF, TEM, H₂-TPR, acetic acid-TPD, and XANES. Catalytic testing was performed in a fixed-bed flow reactor under atmospheric H₂ pressure. Monometallic cobalt catalysts yielded mainly 1-hexene, but rapid deactivation was observed. Incorporation of 0.5%wt secondary metal, particularly Pt, increases activity and stability under H_2. A relatively higher olefin/paraffin ratio can be obtained from the reaction over 5%Co+0.5%Pt/SiO₂ when compared to that with higher Pt loading. The co-impregnation method offers Co-Pt catalysts with stability higher than that prepared by the sequential impregnation method. Over cobalt-based catalysts, the deoxygenation is proposed to proceed via reduction of heptanoic acid to heptanal that is an intermediate for decarbonylation to hexene; while other side reactions are suppressed.

检查了在双金属钴（Co-Pt，Co-Au，Co-Pd，Co-Ru）上负载的二氧化硅催化剂上庚烷酸（模型化合物）的脱氧性，以生产α-烯烃。通过将金属前体常规浸渍在二氧化硅上来制备催化剂，并通过XRF，TEM，H ₂ -TPR，乙酸-TPD和XANES对其进行表征。在固定床流动反应器中在大气压H ₂压力下进行催化测试。单金属钴催化剂主要产生1-己烯，但是观察到快速失活。掺入0.5％wt的仲金属，特别是Pt，可提高在H ₂下的活性和稳定性_。在5％Co + 0.5％Pt / SiO _{2的条件下，}可以从反应中获得相对较高的烯烃/石蜡比与较高的Pt负载相比。共浸渍法提供的Co-Pt催化剂的稳定性要高于顺序浸渍法制备的催化剂。在钴基催化剂上，提出脱氧是通过将庚酸还原为庚醛进行的，庚烷是将羰基脱羰为己烯的中间体。同时抑制其他副反应。