The formation of dibenzofuran (DF), polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and environmentally persistent free radicals (EPFRs) from 1,2,3-trichlorobenzene (1,2,3-TrCBz) over metal oxide / silica surface were investigated using a tubular furnace. PCDD/Fs increased exponentially from 250 to 550 °C over copper oxide / silica surface and PCDD/Fs had the maximum growth from 400 to 450 °C. The ratio of PCDD / PCDF was much less than 1, especially when the temperature raised from 450 to 550 °C. Pentachlorianated dibenzo-p-furan (PeCDF) dominated among the homologues, which contributed 45–61% to the total PCDD/Fs. Two peaks of the yield of DF occurred at 400 °C and 500 °C respectively. Furthermore, the oxygen contents have different effects for PCDD and PCDF formation, and low oxygen could promote PCDD production, especially for tetrachlorinated dibenzo-p-dioxin (TCDD). More PCDF were formed on the oxygen rich condition, indicating that the oxygen promoted the chlorination of DF. Iron oxides are better than copper oxides to catalyze the formation of PCDD/Fs from 1,2,3-TrCBzs at 350 °C, especially for PCDF. The major EPFRs on the catalysts were formed with g values in the range of 2.0040 to 2.0049, which were phenoxy radicals and semiquinone occurred with higher g value of 2.0075 when the temperature increased to 550 °C, and more EPFRs were produced with the temperature increasing. The addition of iron oxides reduced the spins concentrations of oxygen-centered radicals but increase the spins concentrations of signals with lower g values. The different possible formation pathways of PCDD and PCDF from 1,2,3-TrCBz over metal oxide surface were also proposed.

二苯并呋喃（DF），形成多氯代二苯并- p -dioxins和二苯并呋喃（PCDD / FS）和从1,2,3-三氯苯（1,2,3-TrCBz）金属氧化物之上环境持久性自由基（EPFRs）/使用管式炉研究二氧化硅表面。PCDD / Fs在氧化铜/二氧化硅表面上从250°C到550°C呈指数增长，PCDD / Fs从400°C到450°C最大增长。PCDD / PCDF的比率远小于1，特别是当温度从450升高到550°C时。Pentachlorianated二苯并p呋喃（PeCDF）在同源物中占主导地位，占PCDD / F总量的45-61％。DF的两个峰值分别出现在400°C和500°C。此外，氧含量对PCDD和PCDF的形成，和低的氧不同的效果可促进PCDD生产，特别是对于四氯二苯并- p-二恶英（TCDD）。在富氧条件下会形成更多的PCDF，这表明氧气促进了DF的氯化。氧化铁比氧化铜在350°C时催化由1,2,3-TrCBzs形成PCDD / Fs更好，尤其是对于PCDF。催化剂上的主要EPFR形成的g值在2.0040至2.0049的范围内，当温度升高至550°C时，它们是苯氧基和半醌，g值较高的为2.0075，随着温度的升高，生成的EPFR数量更多。 。添加氧化铁降低了以氧为中心的自由基的自旋浓度，但增加了具有较低g值的信号的自旋浓度。还提出了金属氧化物表面上1,2,3-TrCBz形成PCDD和PCDF的不同可能途径。