ments from volcanic gases have been carried out to identify their origins and behavior.1 Especially, knowledge of the carbon isotope ratio (13C/12C) is very important for studies performed in volcanic and geothermal areas, because of the existence of several carbon gases, such as CO2, CO, CH4, COS, CS2. Early studies2,3 showed that geothermal CH4 is enriched in 12C relative to CO2. Isotope equi...

A novel miniaturized calorimeter-type sensor device with a dual-catalyst structure was fabricated by integrating different catalysts on the hot (Pd/θ-Al2O3) and cold (Pt/α-Al2O3) ends of the device. The device comprises a calorimeter with a thermoelectric gas sensor (calorimetric-TGS), combining catalytic combustion and thermoelectric technologies. Its response for a model fuel gas of hydrogen ...

This study considered the fugitive emissions of methane (CH4) from former oil and gas exploration and production wells drilled to exploit conventional hydrocarbon reservoirs onshore in the UK. This study selected from the 66% of all onshore wells in the UK which appeared to be properly decommissioned (abandoned) that came from 4 different basins and were between 8 and 79 years old. The soil gas...

Since huge amounts of CH4 are bound in natural gas hydrates occurring at active and passive continental margins and in permafrost regions, the production of natural gas from hydrate-bearing sediments has become of more and more interest. Three different methods to destabilize hydrates and release the CH4 gas are discussed in principle: thermal stimulation, depressurization and chemical stimulat...

Nanoparticles of zeolitic imidazolate framework-7 (nZIF-7) were blended with poly(ether imide) (PEI) to fabricate a new mixed-matrix membrane (nZIF-7/PEI). nZIF-7 was chosen in order to demonstrate the power of postsynthetic modification (PSM) by linker exchange of benzimidazolate to benzotriazolate for tuning the permeability and selectivity properties of a resulting membrane (PSM-nZIF-7/PEI)....

Gas sensors based on carbon nanotubes (CNTs) as channel materials have been widely considered promising candidates for the detection of toxic gas. However, effectively detecting methane (CH4) with CNTs-based remains challenging because nonpolar CH4 molecules find it difficult to directly interact CNTs. Herein, a functionalized thin-film transistor (TFT) sensor is proposed highly effective at ro...

Natural gas production in the U.S. has increased rapidly over the past decade, along with concerns about methane (CH4) leakage (total fugitive emissions), and climate impacts. Quantification of CH4 emissions from oil and natural gas (O&NG) operations is important for establishing scientifically sound, cost-effective policies for mitigating greenhouse gases. We use aircraft measurements and a ma...

Rates and controlling variables for methanotrophic oxidation of methane at a northeastern Illinois landfill with pumped gas recovery were examined in a field study from June to December 1995. Cover materials consisted of a simple claytopsoil sequence without geomembranes. Through use of a static enclosure (closed chamber) technique supplemented by soil gas concentration profiles and field incub...

The implementation of a sensitive and selective as well as industrial fit gas sensor prototype based on wavelength modulation spectroscopy with second harmonic detection (2f-WMS) employing an 8-μm continuous-wave distributed feedback quantum cascade laser (CW-DFB-QCL) for monitoring hydrogen sulfide (H2S) at sub-ppm levels is reported. Regarding the applicability for analytical and industrial p...

In solid waste management, the Methane (CH4) gas generation needs to be monitored and assessed for environmental protection prevent CH4 atmospheric dispersion over dwelling regions near dump yards. Traditional methods using sensors measures only concentration at different height never modelled or predict circulation in atmosphere. Moreover, every yard based on microclimatic conditions human saf...