Four kinds of noble metal-like catalysts W₂C/AC, W₂N/AC, Mo₂C/AC and Mo₂N/AC were prepared and used for catalytic fast pyrolysis of biomass to upgrade the fuel properties of biomass pyrolysis vapors. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were performed to analyze the volatile pyrolytic products in pyrolysis vapors. Effects of catalyst, pyrolysis temperature and catalyst-to-biomass ratio on the pyrolytic product distribution were examined thoroughly. Actual yields of major pyrolytic products were determined by an external calibration method. Results showed that tungsten-based catalysts performed better than molybdenum-based catalysts, and W₂C/AC possessed comparable performance to Pd/AC catalyst. From the pyrolysis of biomass and its single component, W₂C/AC and W₂N/AC catalysts exhibited promising capability to promote the decomposition of lignin to generate monomeric phenolic compounds, especially stable phenolics. Meanwhile, they would also affect the holocellulose pyrolysis by decreasing anhydrosugars and linear aldehydes, while increasing furans, cyclopentanones and linear ketones. As for an overall effect, catalysis by W₂C/AC and W₂N/AC catalysts was capable to convert those undesirable pyrolytic products (containing aldehyde group, CC bond or carboxyl group) through decarbonylation, hydrogenation, decarboxylation and other reactions, and thus decrease the instability, acidity and oxygen content of pyrolytic products for obtaining high-grade bio-oil.

制备了四种贵金属状催化剂W ₂ C / AC，W ₂ N / AC，Mo ₂ C / AC和Mo ₂ N / AC并用于催化生物质的快速热解，以提高生物质热解蒸气的燃料性质。 。进行了热解气相色谱/质谱（Py-GC / MS）实验，以分析热解蒸气中的挥发性热解产物。彻底检查了催化剂，热解温度和催化剂/生物质比对热解产物分布的影响。主要热解产物的实际产率通过外部校准方法确定。结果表明，钨基催化剂的性能优于钼基催化剂，而W ₂C / AC具有与Pd / AC催化剂相当的性能。从生物质及其单一组分的热解来看，W ₂ C / AC和W ₂ N / AC催化剂具有促进木质素分解以生成单体酚类化合物，特别是稳定酚类的有前途的能力。同时，它们还会通过减少脱水糖和线性醛，同时增加呋喃，环戊酮和线性酮来影响全纤维素的热解。就总体效果而言，使用W ₂ C / AC和W ₂ N / AC催化剂催化能够转化那些不希望的热解产物（含醛基，CC键或羧基）通过脱羰，氢化，脱羧等反应，从而降低了热解产物的不稳定性，酸度和含氧量，从而获得了高级生物油。