过氧化氢在神府烟煤光催化氧化解聚中的作用

Function of Hydrogen Peroxide in Shenfu Bituminous Coal Deploymerization of Photocatalytic Oxidation

将神府煤在不同过氧化氢投加量时进行光氧化解聚,对氧化后煤的丙酮和甲醇萃取液进行分析,并与原煤样进行对照.结果发现:过氧化氢是神府煤光催化氧化解聚过程中主要的引发剂和氧化剂,其浓度对氧化效果有重要影响,但并非投加量越高越好;当过氧化氢的投加量为1.00mL时,光催化氧化的含氧化合物的相对含量最大,可达41.4%;随着光催化氧化反应的进行,氧化煤中含氧化合物相对含量激增,支链烃(包括支链烷烃和支链芳烃)的含量明显减少;另外极性不同的萃取剂对氧化煤萃取得到的萃取物组成不尽相同,极性强萃取剂能析出氧化煤中更多的酮类和酯类物质;联二苯为氧化煤中主要的有机化合物,应该为苯环上氢原子被光解形成苯自由基,然后苯自由基相互作用而形成,过氧化氢在这一过程中起到了夺氢供氧的作用.

Shenfu bituminous coal （SFBC） is deploymerizated by photooxidation with different hydro- gen peroxide dosages. The acetone-soluble fraction （ASF） and methyl-soluble fraction （ESF） of SFBC and OSFBC were analyzed by GC/MS to obtain the data of qualitative and quantitative analysis. The results in- dicated that hydrogen peroxide plays important roles in the SFBC photo-catalytic oxidation process, and it is not only the main initiator but also the oxidizing agent. The hydrogen peroxide has an important influ- ence on oxidation effect, but it is inconsistent with the dosage increasing. When the dosage of hydrogen peroxide is 1.00 mL, the relative proportion of oxygen-containing organic compounds （OCOCs） reach a maximum value of 41.4 %. The increase of OCOCs and the decrease of branched alkanes （BAs） （normal al- kanes （NAs） and alkyarenes） are evidence that organic compounds in coal have been oxidized by photocata- lytic oxidation （PCO） with hydrogen peroxide. In addition, the different polarity organic solvents can obtain different extraction components. The acetones and esters are main products if the higher polarity organic solvent is used as extractant. The biphenyl, a main organic compound in oxidation coal, is formed through that the hydrogen atoms on benyl ring are captured by hydroxyl radicals to prompt the interactions of phe- nyl radicals interacted with the phenyl radical.