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Catalytic Hydrotreatment of Kraft Lignin over NiW/SiC: Effective Depolymerization and Catalyst Regeneration
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-02-02 00:00:00 , DOI: 10.1021/acs.iecr.7b04803 Shi Qiu 1 , Mingrui Li 1 , Yong Huang 1 , Yunming Fang 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-02-02 00:00:00 , DOI: 10.1021/acs.iecr.7b04803 Shi Qiu 1 , Mingrui Li 1 , Yong Huang 1 , Yunming Fang 1
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A key challenge in biomass catalytic conversion, especially in pilot and practical scales, is the stability of the catalyst and its support. Depolymerization of Kraft lignin, which is characterized by structural recalcitrance and poison (metal and ash) rich nature, is a good model reaction to demonstrate the above challenge in biomass conversion. In the present study, the potential of SiC-based catalyst (commercially available SiC nanofiber-supported Ni and W, NiW/SiC) in lignin depolymerization was investigated. The results indicate the SiC-based catalyst is a milder catalyst than the state-of-the-art activated carbon-supported catalyst under the identical conditions and supplies a higher liquid product yield. More importantly, the NiW/SiC catalyst can be easily regenerated by coke combustion and subsequent acid washing, which cannot be achieved by either carbon or metallic oxide-supported catalysts. The performance of the regenerated catalyst with only 4% Ni input is almost unchanged compared with that of the fresh catalyst. These results illustrate that SiC combines the advantages of common supports such as activated carbon and metallic oxides and may be generally applicable as catalyst support in biomass conversion.
中文翻译：
NiW / SiC上牛皮纸木质素的催化加氢处理：有效的解聚和催化剂再生
生物质催化转化，特别是中试规模和实际规模的关键挑战是催化剂及其载体的稳定性。牛皮纸木质素的解聚具有结构顽固性和富含毒物（金属和灰分）的特性，是一种很好的模型反应，可证明上述挑战在生物质转化中。在本研究中，研究了木质素解聚中基于SiC的催化剂（可商购的SiC纳米纤维负载的Ni和W，NiW / SiC）的潜力。结果表明，在相同条件下，基于SiC的催化剂比最先进的活性炭负载的催化剂温和，并提供更高的液体产品收率。更重要的是，NiW / SiC催化剂可通过焦炭燃烧和随后的酸洗轻松地再生，这是用碳或金属氧化物负载的催化剂无法实现的。与新鲜催化剂相比，仅具有4％Ni输入的再生催化剂的性能几乎没有变化。这些结果表明，SiC结合了常见载体（如活性炭和金属氧化物）的优点，可普遍用作生物质转化中的催化剂载体。
更新日期：2018-02-02
中文翻译：
NiW / SiC上牛皮纸木质素的催化加氢处理：有效的解聚和催化剂再生
生物质催化转化，特别是中试规模和实际规模的关键挑战是催化剂及其载体的稳定性。牛皮纸木质素的解聚具有结构顽固性和富含毒物（金属和灰分）的特性，是一种很好的模型反应，可证明上述挑战在生物质转化中。在本研究中，研究了木质素解聚中基于SiC的催化剂（可商购的SiC纳米纤维负载的Ni和W，NiW / SiC）的潜力。结果表明，在相同条件下，基于SiC的催化剂比最先进的活性炭负载的催化剂温和，并提供更高的液体产品收率。更重要的是，NiW / SiC催化剂可通过焦炭燃烧和随后的酸洗轻松地再生，这是用碳或金属氧化物负载的催化剂无法实现的。与新鲜催化剂相比，仅具有4％Ni输入的再生催化剂的性能几乎没有变化。这些结果表明，SiC结合了常见载体（如活性炭和金属氧化物）的优点，可普遍用作生物质转化中的催化剂载体。
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