Technological progress and coupling renewables enable substantial environmental and economic benefits from coal-to-olefins.

China's growing demand for bulk chemicals and concerns regarding energy security are scaling up coal-to-olefins (CTO) production. Three generations of independent dimethyl ether/methanol-to-olefins technologies have been successively launched with greatly improved production efficiencies. However, to date, widespread concerns regarding the intensive environmental impacts and potential economic risks have not been addressed in the context of this industrialization.

Effect of impregnation sequence of Pd/Ce/γ-AlO sorbents on Hg removal from coal derived fuel gas.

This study attempted to investigate the effect of impregnation sequence of the Pd/Ce/γ-AlO sorbents on Hg removal. To this end, five kinds of sorbents were prepared and tested in simulated coal derived fuel gas (N-H-CO-HS-Hg), including Pd/γ-AlO, Ce/γ-AlO and three kinds of Pd-based sorbents with Ce impregnation on γ-AlO substrate. The tests were conducted at 250 and 300 °C respectively.

Release behavior and formation mechanism of polycyclic aromatic hydrocarbons during coal pyrolysis.

Polycyclic aromatic hydrocarbons (PAHs) are major environmental pollutants. They have attracted considerable attention due to their severe potential carcinogenic, mutagenic and genotoxic effects on human health. In this study, five different rank coals from China were pyrolyzed using pyro-probe CDS 5250 and the release behavior of 16 PAHs under different pyrolysis conditions were studied by Gas Chromatography-Mass Spectrometer (GC-MS).

Carbon cycle in advanced coal chemical engineering.

This review summarizes how the carbon cycle occurs and how to reduce CO2 emissions in highly efficient carbon utilization from the most abundant carbon source, coal. Nowadays, more and more attention has been paid to CO2 emissions and its myriad of sources. Much research has been undertaken on fossil energy and renewable energy and current existing problems, challenges and opportunities in controlling and reducing CO2 emission with technologies of CO2 capture, utilization, and storage.

Study on the source of polycyclic aromatic hydrocarbons (PAHs) during coal pyrolysis by PY-GC-MS.

Hazardous organic pollutants such as polycyclic aromatic hydrocarbons (PAHs) generated during the course of coal pyrolysis are highly mutagenic and carcinogenic. The relation between the amount of PAHs from the raw coal and that generated from coal pyrolysis were studied. Firstly, three Chinese coals from Huolinhe, Ximeng and Fenxi were respectively extracted by dichloromethane, and then, online pyrolysis analysis of the raw coals, their extraction residues and extracts were carried out respectively by PY (Pyro-probe CDS 5250)-GC-MS.

Selenium speciation in flue desulfurization residues.

Flue gas from coal combustion contains significant amounts of volatile selenium (Se). The capture of Se in the flue gas desulfurization (FGD) scrubber unit has resulted in a generation of metal-laden residues. It is important to determine Se speciation to understand the environmental impact of its disposal.

[Application of genetic algorithm in formulation optimization of microemulsion for transdermal delivery].

Using naproxen as model drug, the formulation of microemulsion vehicle for transdermal delivery was optimized by genetic algorithm. The ranges of microemulsion composed of Tween 80, IPM, alcohol and water, were defined through construction of the pseudo-ternary phase diagrams. Systematic model microemulsions containing naproxen 1.

[Micro-FTIR study on structure of macerals from Jurassic coals in Northwestern China].

Jurassic coal in Northwest China is rich in resources and it is a necessary premise to reveal the chemical structure characteristics of the coal macerals in this region before the coal is put into reasonable and efficient use. Micro-FTIR technique was used to investigate the chemical composition and structures of vitrinite semifusinite and fusinite from Jurassic coal in Northwestern China. The results show that vitrinite and semifusinite have more aliphatic hydrogen, but fusinite has more aromatic hydrogen and C=O structure.

Kinetics of selective catalytic reduction of NO by NH3 on Fe-Mo/ZSM-5 catalyst.

The catalyst of Fe-Mo/ZSM-5 has been found to be more active than Fe-ZSM-5 and Mo/ZSM-5 separately for selective catalytic reduction (SCR) of nitric oxide (NO) with NH3. The kinetics of the SCR reaction in the presence of O2 was studied in this work. The results showed that the observed reaction orders were 0.

Process effects on activated carbon with large specific surface area from corn cob.

The main factors that affect the large specific surface area (SSA) of the activated carbon from agricultural waste corn cobs were studied by chemically activated method with solution of KOH and soap which acted as surfactant. The experiment showed that not only the activation temperature, activation time and the mass ratio of KOH to the carbonized material, but also the activated methods using activator obviously influenced the SSA of activated carbon. The experimental operating conditions were as follows: the carbonized temperature being 450 degrees C and keeping time being 4 h using N2 as protective gas; the activation temperature being 850 degrees C and holding time being 1.

Effect of Mo contents on properties of Mo/ZSM-5 zeolite catalyst for NOx reduction.

Mo/ZSM-5 catalysts with different Mo content were prepared by impregnation method. The effect of Mo content on the property of Mo/ZSM-5 catalysts and their performance for selective catalytic reduction(SCR) of NO with ammonia was investigated by XRD, ICP, XPS and NO-TPD respectively. The results showed that the catalytic activity of Mo/ZSM-5 for SCR of NO is strongly influenced by the Mo loading in HZSM-5 zeolites.

Pyrolytic behavior of waste corn cob.

The powder of the agricultural waste corn cob was pyrolyzed in a tube-typed stainless steel reactor of 200 ml volume under N2 atmosphere. The compositions of the gases and liquid obtained at different pyrolytic temperatures below 600 degrees C at the heating rate of 30 K/min were analyzed. With the increment of the pyrolytic temperature, the yields of the solid and the liquid products were decreased, but the yield of gas products was increased.