... naphthene-monoarenes naphthene-biarenes naphthene-triarenes The diversity of oil-composing naphthene-aromatic hydrocarbons—hybrid compounds with molecules containing an alkyl substituent and naphthene and aromatic cycles—is due to the transformation of biologic steroids and terpenoids of initial...

...Solomon Adeniyi Adekola; Kai Mangelsdorf; Akinsehinwa Akinlua ABSTRACT The distribution pattern and occurrence of aromatic hydrocarbons as influenced by thermal maturity and the nature of Aptian to Campanian source rocks from the Orange Basin were investigated to gain more understanding...

... ⋅6H 2 O as a precursor. The catalytic performance of the Zn/Acid-MMT for the aromatization of heptane was investigated. The amount and distribution of acidity of Acid-MMT, which could be adjusted by changing the acid activation time and temperature, significantly affected the heptane conversion...

... plants, coke industries, foundries and port. In this article, an effort has been made to understand the occurrences of polycyclic aromatic hydrocarbons (PAHs or Polynuclear aromatic hydrocarbons or polyaromatic hydrocarbons) in sub-bituminous coals. The PAHs are known for their toxicity, carcinogenic...

...Xiao Liang; Naiwang Liu; Li Shi; Xuan Meng Abstract Exploring reliable hydrogenation catalysts to remove trace olefins in aromatic hydrocarbons through hydrogenation is an important topic. In this paper, a bimetallic Cu–Ru/montmorillonite (Cu–Ru/M) catalyst was prepared using a step-by-step...

...I. Theodore Oramah Abstract Surface soil samples were collected at the top and bottom of the Dashiwei karst tiankeng (large karst sinkholes) and measured for the presence of polynuclear aromatic hydrocarbons (PAHs). Comparisons were made on the distribution of PAHs at the top and bottom...

... to the extents to which three temperature-dependent geochemical reactions have occurred: isomerization of steranes at C-20; isomerization of hopanes at C-22; and aromatization of C-ring monoaromatic steroid hydrocarbons. Estimates of the kinetic constants of these reactions have been published previously...

... and hopanes) tend to provide only a very general picture. The presence of specific biomarker compounds in oils is needed for more detailed information. Such markers include C 21 and C 23 n -monoalkyl-substituted aromatic hydrocarbons found in many oils from the Tomsk region ( Goncharov et al, 2000 , 2003...

...]. The Fe 2+ ion causes distortions of octahedra in this organic mineral, though the effect has hardly been observed in inorganic minerals. In the third section, we describe the crystal chemistry and process of formation of polycyclic aromatic hydrocarbon (PAH) minerals, which are the most typical molecular...