摘要
在500mL反应釜中进行CO气氛下玉米秆水热液化实验,主要考察4种碱性催化剂(NaOH、KOH、Na2CO3和K2CO3)对水热液化过程的影响,采用氢核磁(H-NMR)和红外光谱(FT-IR)等手段对液相产物进行分析。实验结果表明:在反应温度为380℃、反应时间为30min的条件下,这些催化剂均能有效促进生物质的水热液化,可使玉米秆液化的总转化率由82.3%提高到93.3%～98.9%;液相产物产率为35.41%～40.71%,保留了原料中63.77%～65.54%的C元素、55.99%～65.48%的H元素、7.51%～9.35%的O元素以及78.91%～82.32%的热量;碳酸盐的催化活性高于氢氧化物,Na的催化活性高于K;催化剂能使液相产物H/C比及热值升高、O含量降低,这可能是由于催化剂促进了CO的直接脱氧及水气变换产生活泼氢的过程;不同催化剂所对应液相产物品质相差不大,表明这些碱性催化剂可能遵循相似的催化机理。
Hydrothermal liquefaction of corn stalk under CO atmosphere was performed in a 500mL high pressure autoclave. The effects of four kinds of alkali catalysts （NaOH, KOH, Na2CO3, K2CO3 ） on liquefaction were studied and the characters of liquid products were analyzed by H-NMR and FT-IR methods. The results indicate that the catalysts are helpful for the hydrothermal liquefaction of biomass at the temperature of 380℃ and reaction time of 30min. The conversion of corn stalk is increased from 82.3% to 93.3% -98.9% ; The yield of liquid product （LP） was in the range of 35.41%-40.71% ; The LPs preserved 63.77%-65.54% of C, 55.99%-65.48% of H, 7.51% -9.35% of O and 78.91% -82.32% of heating value from the corn stalk; The activity order of the catalysts followed ： carbonate 〉 base, sodium 〉 potassium ; By adding the catalysts, the H/C ratio, higher heating value increased and content of O decreased drastically for liquid products. Besides, the structure and composition of the liquid products for catalytic liquefaction of biomass were almost the same, indicating that the catalytic mechanism was similar for different catalysts.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2012年第12期2021-2025,共5页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(20906025)
上海市自然科学基金(09ZR1407400)
煤燃烧国家重点实验室开放基金(FSKLC1107)
中国博士后科学基金(2011M500336)
关键词
玉米秆
催化
一氧化碳
水
液化
corn stalk
catalytic
CO
water
liquefaction
