With the rapid development of industry and economy,the excessive emission of carbon dioxide has caused many environmental issues such as greenhouse effect,which has affected the survival and development of human beings.Therefore,the re-utilization of carbon dioxide has become the research focus of environmental governance and carbon chemical industry.In this study,a novel Li2O-CaO/MgAl2O4 bi-alkali Mg-Al spinel catalyst is prepared based on the green carboxylation of carbon dioxide,and is applied to the green carboxylation of carbon dioxide with sodium phenol.The conversion rate of sodium phenol reaches 92.93% and the selectivity of salicylic acid is 91.55% under carbon dioxide supercritical condition.The structure-activity relationship between the structure of alkali metal catalysts and catalytic carboxylation is studied.The bimetallic basic active site in the catalysts is the catalytic center,and the MG-Al spinel structure strengthens the catalytic action of the bimetallic active site.The synergistic catalytic action between the bimetallic active sites represents the key to obtain high yield from carbon dioxide supercritical carboxylation.
HPR-100 Series Reactor型超临界二氧化碳合成装置(美国STF公司);AL 204电子天平(梅特勒-托利多仪器有限公司);GC-20A型高效液相色谱仪(日本岛津公司);AV-100/400 MHz核磁共振波谱仪(德国布鲁克仪器有限公司);TENSOR27傅里叶红外光谱仪(德国布鲁克仪器有限公司);AP-01真空抽滤仪(上海奥特宝恩斯仪器有限公司);CQF-50超声波清洗器(中船重工第七二六研究所);SZ-93自动双重纯水蒸馏器(上海亚荣生化仪器厂);循环水式真空泵(南京文尔仪器有限责任公司)。
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