Catalytic co-cracking of distilled bio-oil and ethanol over Ni-ZSM-5/MCM-41 in a fixed-bed
Catalytic co-cracking of distilled bio-oil and ethanol over Ni-ZSM-5/MCM-41 in a fixed-bed
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Ni-ZSM-5/MCM-41 固定床催化共裂解蒸馏生物油和乙醇
DOI：
10.1016/j.biombioe.2017.04.006
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发表时间：
2017-07
影响因子：
6
通讯作者：
Chen Guanyi
中科院分区：
文献类型：
--
作者：
Ma Wenchao;Liu Bin;Ji Xiang;Li Xiangping;Yan Beibei;Cheng Zhanjun;Chen Guanyi
将稻壳快速热解所得生物油在0.005 Mpa下减压蒸馏，然后与乙醇（质量比为2:3）混合。在固定床上，以Ni-ZSM-5/MCM-41分子筛为原料，温度500℃，WHSV为3.75 h−1，催化共裂化。蒸馏结果表明，与原料油相比，蒸馏后的生物油含氧量较低（由原料油的45.91 wt.%降至33.74 wt.%）， H/C值较高（0.35），HHV值较高（22.81 MJ/kg）。在蒸馏生物油与乙醇催化共裂化过程中，乙醇参与了酮化、酯化、芳构化和脱水反应。与ZSM-5/MCM-41分子筛相比，负载Ni减少了炭的形成。ZSM-5/MCM-41催化剂具有较高的酯化和芳构化活性，可将升级生物油中的酸转化为酯类、芳烃类或酚类。Ni-ZSM-5/MCM-41催化剂通过酮化反应将酸转化为酮，表现出优异的催化活性。6% Ni-ZSM-5/MCM-41催化剂表现出良好的催化活性，最低炭成率（7.3 wt.%）和较高的生物油升级率（40.8 wt.%）。升级后的生物油中酸含量降至0.1 wt.%，产物中co2和CO的总浓度为36.8 vol.%。
The bio-oil from rice hull fast pyrolysis was distillated under reduced pressure at 0.005 Mpa, then mixed with ethanol (2:3 by weight). The mixture was subjected to catalytic co-cracking over Ni-ZSM-5/MCM-41 molecular sieves in a fixed-bed at 500 °C and 3.75 h−1of the WHSV. The distillation results showed the distilled bio-oil, compared with raw bio-oil, contained lower oxygen content (decreased from 45.91 wt.% in raw bio-oil to 33.74 wt.%), higher (H/C)effratio (0.35) and HHV value (22.81 MJ/kg). The ethanol was involved in the ketonization, esterification, aromatization and dehydration during the catalytic co-cracking of distilled bio-oil and ethanol. The Ni loaded on ZSM-5/MCM-41 molecular sieves reduced char formation compared with ZSM-5/MCM-41. The ZSM-5/MCM-41 catalyst exhibited higher activity in the esterification and aromatization, which converted acids in upgraded bio-oil to esters, aromatics or phenols. The Ni-ZSM-5/MCM-41 catalysts showed excellent activity that transformed acids to ketones by ketonization process. The 6% Ni-ZSM-5/MCM-41 catalyst performed the good activity with the minimum char formation (7.3 wt.%) and higher upgraded bio-oil (40.8 wt.%). Moreover, the acid content in the upgraded bio-oil dropped to 0.1 wt.% and the total concentration of CO2and CO in the gas products was 36.8 vol.%.
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