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Lignite is rich in oxygen-containing species (OCSs) and able to load Ni via ion exchange to prepare Ni/C catalyst. However, the OCSs usually exists in the form of organic salts, which can reduce the capacity of Ni ion exchange. In this paper, Shengli lignite (SL) was treated with HCl and HCl/HF to selectively remove the organic salts and insoluble minerals, respectively, and the modified lignite was...
The selective enrichment of macerals and inorganic minerals during coal grinding may have an obvious effect on pyrolysis reactivity. In this paper, chemical structures and pyrolysis processes of Zhundong coal samples with different particle sizes were investigated by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA), then semi-quantitatively characterised by a series...
In the present study, the polycyclic aromatic hydrocarbons (PAHs) and soot particulates emitted from a gasoline direct injection (GDI) engine were sampled and analyzed. The results show that the vapor-phase PAHs and particulate-bound PAHs exist in GDI engine exhaust emissions. Soot particles are formed by the agglomeration of the quasi-spherical primary carbon particles, and the size of the PAH cluster...
Thermochemical conversion of crops straw is receiving renewed attention, due to the energy and material recovery that can be achieved. However, it still lacks the kinetic background which is of great importance for a successful design of thermochemical process. In this work, pyrolysis test for soybean straw was performed in a non-isothermal thermogravimetric analysis (TGA) in order to determine the...
This study investigated the chemical characteristics of polycyclic aromatic hydrocarbons (PAHs) and soot particulates emitted from a gasoline direct injection (GDI) engine. The microcosmic morphology of the soot particulate and the correlations between PAH species and the primary carbon particles were studied during dynamometer testing of different engine operating conditions using our purpose-built...
Catalytic gasification of a pig compost (PC) was investigated over transition metal catalysts (TMCs, including limonite, CoMo/Al2O3, Ni/Al2O3, and nickel loaded on lignite char) and Ca-based catalysts (dolomite and CaO) in a two-stage fixed-bed reactor to understand the effects of catalyst, temperature, and steam on nitrogen distributions. Non-catalytic thermal decomposition (TD) of PC volatiles below...
Fast pyrolysis of a sewage sludge sample, which contains a high content of nitrogen, was investigated to understand the effects of pyrolysis temperature and sweeping gas flow rate on the yields of pyrolysis products and the distributions of carbon and nitrogen. The maximum oil yield of ca. 48.7% (daf) was achieved at a pyrolysis temperature of 500°C and a sweeping gas flow rate of 600cm 3 ...
Vitrinite- and inertinite-rich samples separated from Shenfu-Dongsheng (SD) and Pingshuo (PS) coals were extracted with CS 2 and the extraction solutions were analyzed with GC/MS. The results show that extract yields of the two maceral-rich samples (MRSs) from PS coal are much higher than those from SD coal; for MRSs from the same coal, the yield of vitrinite-rich sample is larger than that...
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