Two-Step Catalytic Degradations of Dahuangshan Lignite and Directional Upgrading of the Resulting Petroleum Ether-Extractable Portions

Abstract

A biochar (BC)-supported non-noble metal catalyst CoMoS x O y @BC was prepared by in situ co-pyrolysis and ex situ sulfurization, and a two-step conversion (TSC) strategy, including H2-controlled catalytic hydroconversion (CHC) and catalytic ethanolysis without H2 participation, was proposed and used for catalyzing degradation of Dahuangshan lignite (DL) into soluble species (SSs) in high yields. CoMoS x O y @BC with uniformly dispersed nanoparticles of metals, metal sulfides, and metal oxides plays a crucial role in the TSC. The effective activation of H2 and ethanol over CoMoS x O y @BC facilitates cleaving bridged linkages in organic matter of DL to increase the SS yields. As a result, the total yield of SSs increased from 42.7% via non-catalytic degradation (NCD) to 70.0% via catalytic degradation (CD), while that of the petroleum ether-extractable portion (PEEP) increases from 17.5% via NCD to 27.0% via CD. In addition, according to the analysis with a gas chromatograph/mass spectrometer, alkanes, arenes, and arenols are dominant in PEEPs from step 1 (PEEPs1), while alkanol, arenols, and esters in PEEPs from step 2 (PEEPs2) are predominant. The difference in composition among the PEEPs and hydrogenated PEEPs obtained by the CHC further confirms that PEEPs1 are more suitable as a precursor for the fuel-platform unit, while PEEPs2 are better candidates for obtaining value-added chemicals. In other words, multiple PEEPs in high yields with different properties can be obtained by this TSC strategy, which provides a potential and promising alternative to the clean and efficient utilization of lignites.

Insight into the Compositional Features of Organic Matter in Xilinguole Lignite through Two Mass Spectrometers

“…Orbitrap MS equipped with an APCI source has proved to be a practical instrument for determining the molecular weight distribution of soluble coal derivatives. , An APCI source is suitable for the detection of medium-polarity and volatile compounds. As shown in Figure , although the molecular masses of EP 1 exhibit nearly normal distribution in both positive ion mode and negative ion mode APCI sources, compounds were easily ionized in the positive ion mode APCI source.…”

Catalytic Degradation and Directional Upgrading of Zhunnan Lignite: Double Constraint of Active Hydrogen and Effective Acquisition of Derived Arenes over Nickel Ferrite

“…This speculation was also supported by the CHC of BON over NiFe 2 O 4 . Based on a previous investigation, 45 compared to SP N , SP C is more suitable for upgrading to highdensity liquid fuels, which will be analyzed and evaluated in the subsequent part.…”