Efficiency of high-loaded nickel catalysts modified by Mg in hydrogen storage/extraction using quinoline/decahydroquinoline pair as LOHC substrates  

作　　者：Anton P.Koskin Jingsong Zhang Olga B.Belskaya Olga A.Bulavchenko Darya A.Konovalova Sergey A.Stepanenko Arkadiy V.Ishchenko Irina G.Danilova Vyacheslav L.Yurpalov Yurii V.Larichev Roman G.Kukushkin Petr M.Yeletsky 

机构地区：[1]Federal Research Center Boreskov Institute of Catalysis SB RAS,Acad.Lavrentiev av.,5,Novosibirsk,630090,Russian Federation [2]Center of New Chemical Technologies BIC,Boreskov Institute of Catalysis,Neftezavodskaya st.,54,Omsk 644040,Russia

出　　处：《Journal of Magnesium and Alloys》2024年第8期3245-3263,共19页镁合金学报（英文）

基　　金：supported by the Ministry of Science and Higher Education of the Russian Federation within governmental order for Boreskov Institute of Catalysis SB RAS (projects FWUR-2024–0038, FWUR-2024–0032 and FWUR2024–0039)

摘　　要：An effect of Mg introduction on efficiency of high-loaded nickel catalysts in dehydrogenation of decahydroquinoline(10HQ)was inves-tigated.10HQ dehydrogenation is key process for the liquid organic hydrogen carrier(LOHC)storage technology using the quinoline/10HQ pair as H_(2)-lean/H_(2)-rich substrates.An influence of synthesis technique of Ni/Mg/Al catalysts on their properties has been demonstrated.The catalysts were synthesized through coprecipitation of Ni,Mg,Al precursors to obtain layered double hydroxides(LDH)or via syn-thesis of(∼72 wt%)Ni-Al_(2)O_(3) system-also through coprecipitation,followed by modifying with a magnesium-containing precursor.For the catalysts of the first series,the inclusion of magnesium into LDH lattice led to a significant increase in catalytic activity in hydrogen extraction(10HQ dehydrogenation reaction).Despite the decrease in the content of catalytically active nickel,a significant increase in the yield of the dehydrogenation product was observed.This regularity is presumably associated with appearance of basic sites,that accelerates the dehydrogenation reaction.In the case of the second series,activity of pre-reduced(600°C,H_(2))catalysts in dehydrogenation of 10HQ also significantly depends on a MgO content and is maximal at Mg:Ni weight ratio 0.056.Using an in-depth study of structure of the original and reduced catalyst samples(Ni-Al_(2)O_(3) and Ni-MgNiOx-Al_(2)O_(3)),it was shown that this regularity is associated with the increased resistance of catalytically active Ni particles to agglomeration during the reductive activation.Also,using the Ni-MgNiOx-Al_(2)O_(3)catalyst for hydrogen storage process(hydrogenation reaction),the possibility of deep quinoline hydrogenation(up to 10HQ)in a flow-type reactor was demonstrated for the first time.

关 键 词：Mg-modified catalysts High-loaded nickel catalyst Layered double hydroxides Hydrogen storage LOHC DEHYDROGENATION 

分 类 号：TQ426[化学工程] TK91[动力工程及工程热物理]