Integrated coal pyrolysis with dry reforming of low carbon alkane over Ni/La2O3 to improve tar yield. (15th April 2020)

• Record Type: Journal Article
• Authors: Lv, Jiannan; Wang, Dechao; Wang, Mingyi; Li, Yang; Jin, Lijun; Hu, Haoquan
• Is Part Of: Fuel. Volume 266(2020)
• Publication Date: 2020-04-15
• Subjects: BET Brunauer-Emmett-Teller -- BJH Barrett-Joyner-Halenda -- CP-DRA coal pyrolysis coupled with dry reforming of low carbon alkane -- CP-DRM coal pyrolysis coupled with dry reforming of methane -- CP-N2 coal pyrolysis under N2 -- DRA dry reforming of low carbon alkane -- DRM dry reforming of methane -- DTG Derivative thermogravimetry -- EDS Energy dispersive X-Ray spectroscopy -- GC Gas chromatography -- H2-TPR H2 temperature programmed reduction -- Py-TOF-MS In-situ pyrolysis-time of flight mass spectrometry -- SEM Scanning electron microscopy -- TG Thermogravimetric analysis -- XPS X-ray photoelectron spectroscopy -- XRD X-ray diffraction -- daf dry ash free -- Mad moisture content of coal based on air dry basis (wt.%) -- Aad ash content of coal based on air dry basis (wt.%) -- Vdaf volatile matter of coal based on dry ash-free basis (wt.%) -- Ad ash content of coal based on dry basis (wt.%) -- Dave average pore diameter (nm) -- SBET specific surface area (m2/g) -- Vt pore volume (cm3/g) -- Vgas volume of gas component in gas product (L) -- VN2 volume of nitrogen in the gas product (L) -- xgas content of gas component (vol.%) -- xN2 content of nitrogen in gas product (vol.%) -- Ytar tar yield (wt.%, daf) -- Ychar char yield (wt.%, daf) -- wo weight of coal sample in air dry (g) -- wtar weight of tar (g) -- wchar weight of char in dry basis (g); Coal pyrolysis -- Dry reforming -- Low carbon alkane -- Ni/La2O3 -- Tar; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.117092
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Integrated coal pyrolysis with dry reforming of alkane (DRA) can improve tar yield. Ni/La2 O3 prepared by co-precipitation shows good performance for DRA. The highest tar yield is 20.6 wt.% in coal pyrolysis with DRA over Ni/La2 O3 . La2 O2 CO3 formed from La2 O3 inhibits carbon deposition during DRA reaction. Abstract: Integrated coal pyrolysis with dry reforming of methane with addition of low carbon alkane provides an effective method for improving tar yield. One of the key issues is the development of catalysts for dry reforming of low carbon alkane (DRA). In this study, Ni/La2 O3 was prepared by co-precipitation and used for DRA. A mixture of ethane and methane in molar ratio of 1:8 was reformed by CO2 and integrated with coal pyrolysis to improve tar yield. The result showed that tar yield under integrated process of coal pyrolysis with DRA over Ni/La2 O3 at 600 °C is 1.18 times that under N2 . Ni/La2 O3 shows less carbon deposition, and better performance than Ni/Al2 O3, and the tar yield over Ni/La2 O3 is 1.09 times that over Ni/Al2 O3 at 600 °C. Less carbon deposition over Ni/La2 O3 is mainly due to the formation of La2 O2 CO3 under dry reforming. The tar yield remains stable after the Ni/La2 O3 was used for 6 times, indicating good regenerability of Ni/La2 O3 .