Pyrolysis of Methyl tert-Butyl Ether (MTBE). 1. Experimental Study with Molecular-Beam Mass Spectrometry and Tunable Synchrotron VUV Photoionization

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• 作者：Taichang Zhang ; Jing Wang ; Tao Yuan ; Xin Hong ; Lidong Zhang ; Fei Qi
• 刊名：Journal of Physical Chemistry A
• 出版年：2008
• 出版时间：October 23, 2008
• 年：2008
• 卷：112
• 期：42
• 页码：10487-10494
• 全文大小：421K
• 年卷期：v.112,no.42(October 23, 2008)
• ISSN：1520-5215

文摘

An experimental study of methyl tert-butyl ether (MTBE) pyrolysis (3.72% MTBE in argon) has been performed at low pressure (267 Pa) within the temperature range from 700 to 1420 K. The pyrolysis process was detected with the tunable synchrotron vacuum ultraviolet (VUV) photoionization and molecular-beam mass spectrometry (MBMS). About thirty intermediates are identified from near-threshold measurements of photoionization mass spectrum and photoionization efficiency spectrum. Among them, H₂, CO, CH₄, CH₃OH and C₄H₈ are the major pyrolysis products. The radicals such as methyl, methoxy, propargyl, allyl, C₄H₅ and C₄H₇ are detected. The isomers of pyrolysis products are identified as well, i.e., propyne and allene, 1,2,3-butatriene and vinylacetylene, isobutene and 1-butene, propanal and acetone. Furthermore, the mole fractions of the pyrolysis products have been evaluated under various temperatures. Meanwhile, the initial formation temperatures of different pyrolysis products can be obtained. This work is anticipated to present a new experimental method for pyrolysis study and help understand the pyrolysis and combustion chemistry of MTBE and other oxygenated fuels.