Several reactions parallel happened during co-pyrolysis of coal and biomass, such as primary volatiles of coal and biomass will contact and react with the nascent char from coal or biomass themselves' pyrolyzed. To clarify the function of bio-char and investigate if bio-char has the catalytic effect on pyrolysis products of Hulunbuir lignite, a two-stage reactor is designed and used in this study. The effects of bio-char preparing temperature, char-making method and usage amount of bio-char were discussed. In comparison with the alone coal pyrolysis at 650 °C, the portion of light tar (n-hexane soluble) from pyrolysis of coal with bio-char (20 wt% of coal), increased by 30.31%, gas volume yield increased by 9.05% and the volume yield of hydrogen and methane increased by 6.36% and 5.64%, respectively. For the most efficient RSCR-700 against the test with quartz, the H/C molar ratio in RSCR-700's produced tar increased by 22.06%, while the contents of N and S elements decreased by 27.88% and 25.0% accordingly. The role of bio-char in the coal tar upgrading process was further explored through the instruments characterization. Besides the thermal cracking, the bio-char also can provide catalytic active sites to crack heavy fraction of coal tar.

在煤和生物质的共热解过程中发生了一些平行的反应，例如煤和生物质的主要挥发物将与煤或生物质自身热解后产生的初生炭接触并发生反应。为了阐明生物炭的功能并研究生物炭是否对呼伦贝尔褐煤的热解产物具有催化作用，设计并使用了两级反应器。讨论了生物炭制备温度，制炭方法和生物炭用量的影响。与仅在650°C的煤进行热解相比，轻质焦油（n煤与生物炭（占煤的20 wt％）热解制得的可溶于正己烷的溶液，增加30.31％，气体体积收率增加9.05％，氢气和甲烷的体积收率分别增加6.36％和5.64％。对于最有效的RSCR-700相对于石英的测试，RSCR-700生产的焦油中的H / C摩尔比增加了22.06％，而N和S元素的含量分别减少了27.88％和25.0％。通过仪器表征，进一步探讨了生物炭在煤焦油升级过程中的作用。除了热裂解外，生物炭还可以提供催化活性中心，以裂解大量的煤焦油。