生物质炭和富二氧化碳合成气制取二甲醚

研究了一种利用富二氧化碳合成气和生物质炭联合制取二甲醚的方法, 其过程包括两个步骤: 富二氧化碳合成气调整以及调整后合成气合成二甲醚. 在合成气调整过程中, 利用生物质炭为原料在Ni/Al₂O₃催化剂上将富二氧化碳合成气调整为富一氧化碳合成气. 经过800 °C合成气调整后, 合成气中CO₂含量大幅降低而CO含量大幅提高, CO₂/CO的摩尔比从原始合成气的6.33降至0.21. 然后, 分别用调整前后的合成气合成二甲醚, 结果表明, 经过调整后, C转化率得到很大的提高, 二甲醚产率比调整前高4倍. 本工作提供了一种可利用富二氧化碳生物质合成气制取燃料的途径, 并且提供了一种新的利用生物质炭的方法.

Dimethyl Ether Production from Biomass Char and CO_2-Rich Bio-Syngas

We report on a novel approach toward dimethyl ether (DME) synthesis using crude CO2-rich bio-syngas and biomass char.The crude bio-syngas was derived from bio-oil reforming and was initially conditioned by catalytic conversion into CO-rich bio-syngas using biomass char over the Ni/Al203 catalyst.The molar ratio of CO2 to CO significantly decreased from 6.33 in the CO2-rich bio-syngas to 0.21 after bio-syngas conditioning at 800 C.The yield of dimethyl ether from the conditioned bio-syngas was about four times higher than that from the CO2-rich bio-syngas over the Cu-ZnO-Al2O3/HZSM-5 catalyst.This work potentially provides a useful approach toward producing biofuels and chemicals from bio-syngas and a novel utilization of biomass char.