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Wang C.,Dalian National Laboratory for Clean Energy | Wang C.,University of Chinese Academy of Sciences | Liu Q.,Dalian National Laboratory for Clean Energy | Liu Q.,University of Chinese Academy of Sciences | And 7 more authors.
Cuihua Xuebao/Chinese Journal of Catalysis | Year: 2013

A one-step hydrotreatment of soybean oil to produce iso-alkanes has been carried out over a Pt/SAPO-11 catalyst in a fixed-bed reactor. The influence of reaction conditions such as temperature, pressure, hydrogen/oil ratio, and space velocity on the catalytic performance has been investigated. From the levels of intermediate products, gas products (CO, CO2) and the target product (alkane), it was found that the hydrogenolysis of esters, fatty acids and fatty aldehydes and the formation of fatty alcohols were prohibited, which led to high selectivity for hydrodecarboxylation and hydrodecarbonylation at high temperature, low pressure or low hydrogen/oil ratio. The selectivity of the isomerization increased when temperature increased or space velocity decreased, while pressure and hydrogen/oil ratio were found to have no influence. A plausible reaction pathway has been proposed based on these results. © 2013, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

Ma X.,Dalian National Laboratory for Clean Energy | Yang Z.,BP China Holdings Ltd | Liu X.,BP China Holdings Ltd | Tan X.,BP China Holdings Ltd | Ge Q.,Dalian National Laboratory for Clean Energy
RSC Advances | Year: 2015

Esters (methyl acetate, ethyl acetate, dimethyl oxalate) can oxidize Cu0 of the reduced Cu/SiO2 catalyst to Cu+ and the obtained Cu+ can be reduced back to Cu0 by H2 under reaction conditions. Cu0 and Cu+ are in a dynamic cycle during ester hydrogenation. The ratio of Cu+/Cu0 in the presence of esters under reaction conditions is probably different from that in the absence of esters under characterization conditions. The effect of the dynamic cycle on the Cu+/Cu0 ratio should be taken into consideration when establishing the relationship between the Cu+/Cu0 ratio and reaction performance. © The Royal Society of Chemistry.2015.

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