Autothermal reforming of heavy-hydrocarbon fuels by morphology controlled perovskite catalysts using carbon templates

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• 作者：Yukwon Jeon^a ; ^c ; ¹ ; Chanmin Lee^b ; ¹ ; Junki Rhee^a ; Gicheon Lee^a ; Jae-ha Myung^c ; Myunggeun Park^a ; Joo-Il Park^d ; Hisahiro Einaga^e ; Yong-Gun Shul^a ; ^{shulyg@yonsei.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：AC ; activated carbon ; ACF ; activated carbon fiber ; ATR ; autothermal reforming ; BET ; Brunauer-Emmett-Teller ; DBT ; dibenzothiophene ; GDC ; gadolinium doped ceria ; GHSV ; gas hour space velocity ; SEM ; scanning electron microscopy ; TEM ; transmission electron microscopy ; TPR ; temperature-programmed reduction ; XPS ; X-ray photoelectron spectroscopy ; XRD ; X-ray diffraction
• 刊名：Fuel
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：187
• 期：Complete
• 页码：446-456
• 全文大小：3852 K

文摘

A novel synthesis of morphology-controlled perovskite networked with LaCr_0.8Ru_0.2O₃ nanoparticles was introduced using activated carbons as sacrificial templates. These catalysts were used for the hydrogen production by heavy-hydrocarbon autothermal reforming. To investigate the effect of the carbon templates, morphology-controlled perovskites using activated carbons and a non-templated catalyst were prepared to determine how carbon templates influence the chemical structure of the perovskite. The carbon templates produced a crystalline structure with the well incorporation of Ru under mild calcination conditions. The morphology of the hollow fibers provided a higher specific surface area than that of the porous grain catalyst with a similar average particle size (∼80 nm). It was found that the hollow fibers showed a unique pore structure with large macropores from 1 to 100 μm, which might offer a higher surface area and enhanced mass transfer of the reactants. This provided a higher activation energy for H₂ production than the porous grain and non-templated catalysts during the autothermal reforming of heavy hydrocarbons. As a result, the fibrous feature and well-defined chemical structure were crucial factors when cracking the hydrocarbon chain. The hollow fiber catalyst showed high reforming efficiency for H₂ production (>65 mol%) from heavy-hydrocarbon fuels during long-term experiments, featuring substantial durability with low carbon deposition and no structural changes.