On-line product analysis of pine wood pyrolysis using synchrotron vacuum ultraviolet photoionization mass spectrometry

  • PDF / 523,591 Bytes
  • 9 Pages / 595.276 x 790.866 pts Page_size
  • 78 Downloads / 190 Views

DOWNLOAD

REPORT


ORIGINAL PAPER

On-line product analysis of pine wood pyrolysis using synchrotron vacuum ultraviolet photoionization mass spectrometry Junjie Weng & Liangyuan Jia & Shaobo Sun & Yu Wang & Xiaofeng Tang & Zhongyue Zhou & Fei Qi

Received: 31 August 2012 / Revised: 18 October 2012 / Accepted: 22 October 2012 # Springer-Verlag Berlin Heidelberg 2012

Abstract The pyrolysis process of pine wood, a promising biofuel feedstock, has been studied with tunable synchrotron vacuum ultraviolet photoionization mass spectrometry. The mass spectra at different photon energies and temperatures as well as time-dependent profiles of several selected species during pine wood pyrolysis process were measured. Based on the relative contents of three lignin subunits, the data indicate that pine wood is typical of softwood. As pyrolysis temperature increased from 300 to 700 °C, some more details of pyrolysis chemistry were observed, including the decrease of oxygen content in high molecular weight species, the observation of high molecular weight products from cellulose chain and lignin polymer, and potential pyrolysis mechanisms for some key species. The formation of polycyclic aromatic hydrocarbons (PAHs) was also observed, as well as three series of pyrolysis products derived from PAHs with mass difference of 14 amu. The time-dependent profiles show that the earliest products are formed from lignin, followed by hemicellulose products, and then species from cellulose. Keywords Biomass pyrolysis . Pine wood . SVUV PIMS . Cellulose . Lignin . Hemicellulose

Published in the topical collection Photo Ionisation in Mass Spectrometry with guest editor Ralf Zimmermann. Electronic supplementary material The online version of this article (doi:10.1007/s00216-012-6516-3) contains supplementary material, which is available to authorized users. J. Weng : L. Jia : S. Sun : Y. Wang : X. Tang : Z. Zhou : F. Qi (*) National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China e-mail: [email protected]

Introduction In consideration of diminishing reserve and serious environmental issues caused by fossil fuels, biofuels are attracting great attention due to some advantages, such as renewability, low cost, low NOx emissions, as well as zero-carbon production [1]. In general, corn and grain are the main biofuel feedstocks at present [2]. However, this topic is always controversial due to the global food crisis [3]. Pine wood has recently received increasing interests as a biofuel feedstock for several reasons. Pine trees are widespread in the world, and they grow fast with good regenerability [4]. More importantly, pine trees are not food crops and this eliminates the difficulties we face with corn. Similar to the sugars derived from corn, hydrocarbon in pine wood can also be converted into biofuels. Biomass pyrolysis is a thermal conversion technology used for the production of lignocellulosic biofuels [5]. However, high oxygen and water content as well as corrosiveness limit the application of bio-oil

Data Loading...