scholarly journals Raman spectroscopic study of cracking and hydrolysis of propane in fused silica capillary capsules between 300 and 400 °C

2017 ◽  
Vol 48 (11) ◽  
pp. 1420-1425 ◽  
Author(s):  
Xiaochun Xu ◽  
I-Ming Chou
Keyword(s):  
Spectroscopic Study ◽  
Fused Silica ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Fused Silica Capillary ◽  
Hydrolysis Of ◽  
Silica Capillary

scholarly journals Raman spectroscopic characterization of cracking and hydrolysis of n-pentane and n-octadecane at 300–375℃ with geological implications

2017 ◽  
Vol 36 (4) ◽  
pp. 955-970 ◽  
Author(s):  
Xiaolin Wang ◽  
Yucai Song ◽  
I-Ming Chou ◽  
Ye Qiu
Keyword(s):  
Spectroscopic Characterization ◽  
Fused Silica ◽  
Chemical Compositions ◽  
Raman Spectroscopic ◽  
Gaseous Products ◽  
Wet Gas ◽  
Fused Silica Capillary ◽  
Micro Reactors ◽  
Hydrolysis Of ◽  
Iron Bearing

Hydrous and anhydrous isothermal experiments on n-pentane and n-octadecane were conducted at 300–375℃ for durations up to 1094 h to evaluate the cracking and hydrolysis of hydrocarbons, using fused silica capillary capsules as micro-reactors. The chemical compositions of the gaseous products during cracking of n-octadecane at 350 and 375℃ were methane, ethane, propane, and n-butane. The aqueous product in the hydrolysis of n-pentane and n-octadecane at 300–375℃ was alcohol. Alkenes and hydrogen were not detected throughout all the isothermal experiments. Results showed that the gaseous yields were characterized by higher contents of wet gas than those in natural gas accumulations. Mechanisms regulating the enrichment of methane in reservoirs should be further studied. The hydrolysis and oxidation of hydrocarbon were relatively limited in the absence of iron-bearing mineral buffers, suggesting that hydrocarbons might be more stable in iron-poor reservoirs (e.g. carbonate and quartz arenite) than in iron-bearing-mineral-rich ones (e.g. mudstone and arkose) under deep burial conditions. The absence of hydrogen was ascribed to its high diffusion rate in fused silica than in gold tube; any hydrogen produced in the reaction tends to diffuse out of the fused silica capsule with no or limited hydrogen accumulation, similar to those in geological environment. The diffusion of hydrogen should be considered during calculating the volume and pressure changes in the thermal cracking of oil to gas in reservoirs, because the loss of hydrogen would result in a decrease in the conversion rate of oil to gas.

A Raman spectroscopic study of a fulgurite

2010 ◽  
Vol 368 (1922) ◽  
pp. 3087-3097 ◽  
Author(s):  
Elizabeth A. Carter ◽  
Michael D. Hargreaves ◽  
Terence P. Kee ◽  
Matthew A. Pasek ◽  
Howell G. M. Edwards
Keyword(s):  
Low Temperature ◽  
Spectroscopic Study ◽  
Thermal Energy ◽  
Polyaromatic Hydrocarbons ◽  
Fused Silica ◽  
Interfacial Zone ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Lightning Bolt ◽  
Glass Bubble

A Raman microspectroscopic study of several fulgurites has been undertaken. A fulgurite is an amorphous mineraloid, a superheated glassy solid that is formed when a lightning bolt hits a sandy or rocky ground and thermal energy is transferred. The Raman spectra revealed several forms of crystalline and fused silica and also the presence of polyaromatic hydrocarbons found in an interfacial zone of a glass bubble. This, together with the presence of anatase, a low-temperature polymorph of TiO 2 , suggested that some regions of the fulgurite specimen were not subjected to temperatures of 1800°C, which are attained when lightning hits the surface of sand or a rock.

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