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Synthesis of micronized CaO assisted by NH4HCO3 with Ca(OH)2 and its application in heterogeneously catalyzing transesterification reaction for producing biodiesel
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2019-06-10 , DOI: 10.1002/jccs.201900023 Haixin Bai 1 , Xiaohua Liu 1 , Fengyu Bao 1 , Zhonglin Zhao 1
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2019-06-10 , DOI: 10.1002/jccs.201900023 Haixin Bai 1 , Xiaohua Liu 1 , Fengyu Bao 1 , Zhonglin Zhao 1
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Micronized CaO with pores was synthesized by calcining the reaction product CaCO3 from NH4HCO3 and Ca(OH)2. Scanning electron microscopy, X‐ray diffraction, energy dispersive X‐ray spectroscopy, X‐ray fluorescence, Fourier transform infrared spectroscopy, and Brunauer–Emmett–Teller analysis were used to characterize CaO, which confirmed that after calcining at 800°C for 2 hr, CaCO3 was completely converted into porous micronized CaO with a surface area of about 7.295 m2/g and a particle size of 0.5–1.5 μm. The porous CaO microparticles were used as heterogeneous catalysts for producing biodiesel from transesterification of soybean oil and methanol. The influences of reaction time, calcined temperature, and reusability of CaO were explored. The experiments showed that CaO has high catalytic activity for transesterification reaction, and the yield of biodiesel reaches more than 98% under the conditions of methanol/oil mole ratio of 9, and the catalyst amount (catalyst/oil) of 3% after reaction for 2.5 hr. The CaO catalyst can be recycled easily and it also has the advantage of low pollution. Simple synthetic route, low cost, high catalytic activity, good reusability, and great potential for industrialization are the advantages of the porous micronized CaO catalyst that was proposed in this work.
中文翻译：
NH4HCO3与Ca（OH）2辅助的微粉化CaO的合成及其在非均相催化酯交换反应生产生物柴油中的应用
通过将反应产物CaCO 3由NH 4 HCO 3和Ca（OH）2煅烧来合成具有孔的微粉化CaO 。扫描电子显微镜，X射线衍射，能量色散X射线光谱，X射线荧光，傅里叶变换红外光谱和Brunauer-Emmett-Teller分析用于表征CaO，证实了在800°C下煅烧2 hr，CaCO 3完全转化为表面积为约7.295 m 2的多孔微粉化CaO。/ g，粒径为0.5–1.5μm。多孔CaO微粒用作非均相催化剂，用于通过大豆油和甲醇的酯交换反应生产生物柴油。探讨了反应时间，煅烧温度和CaO可重复使用性的影响。实验表明，CaO对酯交换反应具有很高的催化活性，在甲醇/油摩尔比为9的条件下，反应后的催化剂量（催化剂/油）为3％时，生物柴油的收率达到98％以上。 2.5小时 CaO催化剂易于回收利用，并且具有低污染的优点。这项工作中提出的多孔微粉化CaO催化剂的优点是合成路线简单，成本低，催化活性高，可重复使用性好以及具有很大的工业化潜力。
更新日期：2019-12-11
中文翻译：
NH4HCO3与Ca（OH）2辅助的微粉化CaO的合成及其在非均相催化酯交换反应生产生物柴油中的应用
通过将反应产物CaCO 3由NH 4 HCO 3和Ca（OH）2煅烧来合成具有孔的微粉化CaO 。扫描电子显微镜，X射线衍射，能量色散X射线光谱，X射线荧光，傅里叶变换红外光谱和Brunauer-Emmett-Teller分析用于表征CaO，证实了在800°C下煅烧2 hr，CaCO 3完全转化为表面积为约7.295 m 2的多孔微粉化CaO。/ g，粒径为0.5–1.5μm。多孔CaO微粒用作非均相催化剂，用于通过大豆油和甲醇的酯交换反应生产生物柴油。探讨了反应时间，煅烧温度和CaO可重复使用性的影响。实验表明，CaO对酯交换反应具有很高的催化活性，在甲醇/油摩尔比为9的条件下，反应后的催化剂量（催化剂/油）为3％时，生物柴油的收率达到98％以上。 2.5小时 CaO催化剂易于回收利用，并且具有低污染的优点。这项工作中提出的多孔微粉化CaO催化剂的优点是合成路线简单，成本低，催化活性高，可重复使用性好以及具有很大的工业化潜力。
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