Developing a cost-effective and environmentally friendly process for the production of valuable chemicals from abundant herbal biomass receives great attentions in recent years.Herein,taking advantage of the“lignin f...Developing a cost-effective and environmentally friendly process for the production of valuable chemicals from abundant herbal biomass receives great attentions in recent years.Herein,taking advantage of the“lignin first”strategy,corn straw is converted to valuable chemicals including lignin monomers,furfural and 5-methoxymethylfurfural via a two steps process.The key of this research lies in the development of a green and low-cost catalytic process utilizing magnetic Raney Ni catalyst and high boiling point ethylene glycol.The utilization of neat ethylene glycol as the sole slovent under atmospheric conditions obviates the need for additional additives,thereby facilitating the entire process to be conducted in glass flasks and rendering it highly convenient for scaling up.In the initial step,depolymerization of corn straw lignin resulted in a monomer yield of 18.1 wt%.Subsequently,in a dimethyl carbonate system,the carbohydrate component underwent complete conversion in a one-pot process,yielding furfural and 5-methoxymethylfurfural as the primary products with an impressive yield of 47.7%.展开更多
钢材碳排放因子是建筑碳排放核算的重要基础,目前相关标准和文献给出的钢材碳排放因子取值变异性较大,且未考虑钢铁工业发展的时效性。调研了国内10家典型高炉-转炉钢铁企业生产清单数据,以及中国钢铁工业协会统计年报数据,构建了近5年...钢材碳排放因子是建筑碳排放核算的重要基础,目前相关标准和文献给出的钢材碳排放因子取值变异性较大,且未考虑钢铁工业发展的时效性。调研了国内10家典型高炉-转炉钢铁企业生产清单数据,以及中国钢铁工业协会统计年报数据,构建了近5年结构钢材产品的物料、能源清单数据库。基于投入产出法,核算了10家典型钢铁企业的钢材产品及中国钢铁工业协会统计年报的碳排放因子,结合钢铁行业EPD平台发布的相关数据,形成了钢筋、型钢、钢板和通用钢材的碳排放因子数据样本及统计参数。在此基础上,针对钢结构常用的钢铁产品如钢筋、型钢和钢板提出了碳排放因子取值建议,主要结论如下:1)钢筋、型钢和钢板的碳排放因子建议值分别取2150、2260、2240 kg CO_(2)e/t。2)所核算的钢筋、型钢和钢板碳排放因子较GB/T 51366—2019《建筑碳排放计算标准》相应取值分别低190、105、160 kg CO_(2)e/t,表明近5年来钢筋、型钢和钢板的生产取得了一定减碳效果。3)与2004年文献发布的碳排放因子相比,所核算的钢筋、型钢和钢板碳排放因子降幅均超过1300 kg CO_(2)e/t,表明我国近20年来结构钢材绿色低碳化发展取得了显著成效。展开更多
基金supported by the Fundamental Research Funds for the Central Universities(QNTD202302)National Natural Science Foundation of China(22378024)the Foreign expert program(G2022109001L).
文摘Developing a cost-effective and environmentally friendly process for the production of valuable chemicals from abundant herbal biomass receives great attentions in recent years.Herein,taking advantage of the“lignin first”strategy,corn straw is converted to valuable chemicals including lignin monomers,furfural and 5-methoxymethylfurfural via a two steps process.The key of this research lies in the development of a green and low-cost catalytic process utilizing magnetic Raney Ni catalyst and high boiling point ethylene glycol.The utilization of neat ethylene glycol as the sole slovent under atmospheric conditions obviates the need for additional additives,thereby facilitating the entire process to be conducted in glass flasks and rendering it highly convenient for scaling up.In the initial step,depolymerization of corn straw lignin resulted in a monomer yield of 18.1 wt%.Subsequently,in a dimethyl carbonate system,the carbohydrate component underwent complete conversion in a one-pot process,yielding furfural and 5-methoxymethylfurfural as the primary products with an impressive yield of 47.7%.
文摘钢材碳排放因子是建筑碳排放核算的重要基础,目前相关标准和文献给出的钢材碳排放因子取值变异性较大,且未考虑钢铁工业发展的时效性。调研了国内10家典型高炉-转炉钢铁企业生产清单数据,以及中国钢铁工业协会统计年报数据,构建了近5年结构钢材产品的物料、能源清单数据库。基于投入产出法,核算了10家典型钢铁企业的钢材产品及中国钢铁工业协会统计年报的碳排放因子,结合钢铁行业EPD平台发布的相关数据,形成了钢筋、型钢、钢板和通用钢材的碳排放因子数据样本及统计参数。在此基础上,针对钢结构常用的钢铁产品如钢筋、型钢和钢板提出了碳排放因子取值建议,主要结论如下:1)钢筋、型钢和钢板的碳排放因子建议值分别取2150、2260、2240 kg CO_(2)e/t。2)所核算的钢筋、型钢和钢板碳排放因子较GB/T 51366—2019《建筑碳排放计算标准》相应取值分别低190、105、160 kg CO_(2)e/t,表明近5年来钢筋、型钢和钢板的生产取得了一定减碳效果。3)与2004年文献发布的碳排放因子相比,所核算的钢筋、型钢和钢板碳排放因子降幅均超过1300 kg CO_(2)e/t,表明我国近20年来结构钢材绿色低碳化发展取得了显著成效。
