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Sorbitol Hydrogenolysis to Glycols over Baisic Additive Promoted Ni-based Catalysts 被引量:2
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作者 Xiao-feng Cao Qi Zhang +4 位作者 Dong Jiang Qi-ying Liu Long-long Ma Tie-jun Wang De-bao Li 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2015年第3期338-344,I0002,共8页
A series of Ni based catalysts with different supports and basic additives were prepared by sequential impregnation method. The catalysts were characterized by XRD, BET, H2-TPR and CO2-TPD techniques. It was found tha... A series of Ni based catalysts with different supports and basic additives were prepared by sequential impregnation method. The catalysts were characterized by XRD, BET, H2-TPR and CO2-TPD techniques. It was found that the introduction of basic additives enhanced the basicities of catalyats and promoted the dispersities of Ni particles by strong interaction between Ni2+ and basic additives. Among the Ni based catalysts, 10%Ni/10%La203/ZrO2 showed the superior performance in sorbitol hydrogenolysis. The synergistic effect of Ni and La203 was proven to play an essential role in selective synthesis of EG and 1,2-PG. In the optimal reaction condition, the catalyst presented 100% sorbitol conversion and over 48% glycols (EG and 1,2-PG) yield. The kinetics study of polyols (sorbitol, xylitol and glycerol) hydrogenolysis showed that polyols with more hydroxyl number have higher activity and products distribution was final results of kinetic balance, which could give us some inspiration abeut how to change the products selectivity. 展开更多
关键词 sorbitol hydrogenolysis glycols Ni catalyst Support Base promoter
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碱促进剂在Ru/CNFs催化山梨醇氢解制备二元醇中的作用 被引量:6
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作者 周静红 刘国才 +2 位作者 隋志军 周兴贵 袁渭康 《催化学报》 SCIE EI CAS CSCD 北大核心 2014年第5期692-702,共11页
研究了NaOH,KOH,Mg(OH)_2,Ba(OH)_2和CaO等5碱促进剂在Ru/CNFs催化山梨醇氢解过程中的作用机制.结果表明,这些碱均能显著提高山梨醇的转化率,但生成二元醇的选择性随碱种类而有所差异,其中以CaO促进的催化剂二元醇选择性最高.CaO提供了... 研究了NaOH,KOH,Mg(OH)_2,Ba(OH)_2和CaO等5碱促进剂在Ru/CNFs催化山梨醇氢解过程中的作用机制.结果表明,这些碱均能显著提高山梨醇的转化率,但生成二元醇的选择性随碱种类而有所差异,其中以CaO促进的催化剂二元醇选择性最高.CaO提供了用以催化C—C键断裂的OH^-,同时与中间产物形成络合物从而影响反应历程.提出了CaO作为促进剂时山梨醇氢解生成二元醇的反应历程,并由此进一步优化了山梨醇浓度、Ru催化剂用量和碱促进剂用量之间的匹配以达到更高的二元醇产率. 展开更多
关键词 山梨醇 氢解 碱促进剂 二元醇 钌催化剂
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气相氧化处理对纳米碳纤维载体及其负载钌催化剂性质的影响 被引量:1
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作者 陈宏 周静红 +2 位作者 赵龙 隋志军 周兴贵 《化学反应工程与工艺》 CAS CSCD 北大核心 2010年第1期24-29,共6页
采用气相氧化方法对纳米碳纤维(CNFs)的表面进行改性,利用X射线衍射(XRD)、N_2物理吸附、Boehm酸碱滴定、CO化学吸附和程序升温还原等手段表征了不同温度气相氧化处理的CNFs载体及相应的负载Ru催化剂,并考察了Ru/CNFs催化剂在山梨醇氢... 采用气相氧化方法对纳米碳纤维(CNFs)的表面进行改性,利用X射线衍射(XRD)、N_2物理吸附、Boehm酸碱滴定、CO化学吸附和程序升温还原等手段表征了不同温度气相氧化处理的CNFs载体及相应的负载Ru催化剂,并考察了Ru/CNFs催化剂在山梨醇氢解制备低碳多元醇过程中的催化性能。结果表明。气相氧化预处理对CNFs的晶体结构影响较小,但是大大增加了CNFs比表面积和表面酸性含氧基团;经气相氧化处理的CNFs负载的Ru催化剂更易还原,Ru金属分散度增加。催化剂考评结果表明,载体的气相氧化处理对Ru/CNFs催化剂在山梨醇氢解过程中反应活性的提高不利,但有利于低碳多元醇产物选择性的提高。研究认为CNFs表面酸性含氧基团是决定Ru/CNFs催化剂在山梨醇氢解过程催化性能的主要因素。 展开更多
关键词 纳米碳纤维 山梨醇氢解 气相氧化处理 钌催化剂 表面含氧基团
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负载型钌催化剂催化山梨醇氢解制乙二醇(英) 被引量:4
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作者 Inmaculada Murillo Leo Manuel Lopez Granados +1 位作者 Jose Luis Garcia Fierro Rafael Mariscal 《催化学报》 SCIE EI CAS CSCD 北大核心 2014年第5期614-621,共8页
Supported Ru catalysts were prepared by wet impregnation to evaluate the role of different oxide supports(Al_2O_3,SiO_2,TiO_2,ZrO_2) in sorbitol hydrogenolysis to glycols.X-ray diffraction,transmission electron micros... Supported Ru catalysts were prepared by wet impregnation to evaluate the role of different oxide supports(Al_2O_3,SiO_2,TiO_2,ZrO_2) in sorbitol hydrogenolysis to glycols.X-ray diffraction,transmission electron microscopy,hydrogen chemisorption,X-ray photoelectron spectroscopy,and NH3temperature-programmed desorption were used to characterize the catalysts,which were active in the hydrogenolysis of sorbitol.The support affected both the physicochemical properties and catalytic behavior of the supported Ru particles.The characterization results revealed that the Ru/Al_2O_3catalyst has a high surface acidity,partially oxidized Ru species on the surface,and a higher surface Ru/Al atomic ratio,which gave it the highest selectivity and yield to glycols. 展开更多
关键词 负载钌催化剂 山梨醇 过负载 二元醇 RU AL2O3催化剂 氢解 X射线光电子能谱 透射电子显微镜
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