Evidence of naturally-occurring vanadyl porphyrins containing multiple S and O atoms

Identification of Vanadyl Porphyrins in a Heavy Crude Oil and Raw Asphaltene by Atmospheric Pressure Photoionization Fourier Transform Ion Cyclotron Resonance (FT-ICR) Mass Spectrometry

Amy M. McKenna, Jeremiah M. Purcell, Ryan P. Rodgers et al. · Energy & Fuels · 2009 · 191 citations

Pharmacy, Petroleum Engineering, Analytical Chemistry +14

Desorption and Ionization of Heavy Petroleum Molecules and Measurement of Molecular Weight Distributions

Kuangnan Qian, Kathleen Edwards, Mike Siskin et al. · Energy & Fuels · 2007 · 123 citations

Natural Sciences, Chemistry, Petroleum Engineering +14

Observation of vanadyl porphyrins and sulfur‐containing vanadyl porphyrins in a petroleum asphaltene by atmospheric pressure photonionization Fourier transform ion cyclotron resonance mass spectrometry

Kuangnan Qian, Anthony S. Mennito, Kathleen Edwards et al. · Rapid Communications in Mass Spectrometry · 2008 · 123 citations

Natural Sciences, Chemistry, Analytical Chemistry +14

Separation and Characterization of Vanadyl Porphyrins in Venezuela Orinoco Heavy Crude Oil

Xu Zhao, Yu Liu, Chunming Xu et al. · Energy & Fuels · 2013 · 116 citations

Natural Sciences, Biochemistry, Chemistry +13

Molecular characterization of petroporphyrins in crude oil by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry

Ryan P. Rodgers, Christopher L. Hendrickson, Mark R. Emmett et al. · Canadian Journal of Chemistry · 2001 · 107 citations

Natural Sciences, Biochemistry, Chemistry +15