Measurement and summary of photoionization data for biomass‐derived compounds

Abstract

Rationale Biomass is a potential feedstock for making liquid fuels and valuable chemicals. Quantitative analysis of biomass conversion in real time by photoionization mass spectrometry (PIMS) is an important way to understand the reaction process. However, the lack of photoionization data for biomass‐derived compounds limits the research using PIMS. Methods Measurements of photoionization data were performed with synchrotron vacuum ultraviolet PIMS. Toluene and methanol were used as calibrated references and solvents in this experiment since their photoionization cross‐sections (PICS) are well documented in the literature. Results The ionization energies (IEs) of 23 biomass‐derived compounds were measured. Among them, the PICSs of 14 compounds were calibrated and presented. Besides, the IEs of 95 other biomass‐derived compounds and their typical fragment ions were also summarized. Conclusions A photoionization database related to IEs and PICSs of biomass‐derived compounds (m/z < 200) is established. PICSs of most biomass‐derived compounds have low values at the most frequently used photoionization energy of 10.5 eV. Lignin‐derived compounds have lower IEs than carbohydrate‐derived compounds.

In Situ Mass Spectrometric Analysis on Zeolite-Catalyzed Pyrolysis of Furanic Compounds: The Role of Reactive Intermediates

“…According to the measured PIE value (10.86 eV), the mass peak at m / z 30 was assigned to formaldehyde . The threshold of m / z 58 at 9.70 eV corresponds to acetone (IE = 9.70 eV). , In addition, if the PIE curve exhibited one or more ionization thresholds, the compound corresponding to each ionization threshold could be qualitatively determined by comparing its ionization energy in the literature. For example, two inflection points occur at 7.74 and 9.98 eV for m / z 108 (Figure a), which correspond well with the IEs of 1,4,5-trimethylcyclopenta-1,3-diene and p -benzoquinone, respectively .…”