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��ѧ��ҵ�빤�� 2015, Vol. 32 Issue (2) :25-30    DOI: 10.13353/j.issn.1004.9533.2015.02.005
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Hydrogenolysis of Glycerol to 1,2-Propanediol on Cu-Based Catalysts Derived from Hydrotalcite-Like Precursors
Tian Shasha, Yang Juan, Chen Jixiang
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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ժҪ ��Cu-Zn-Al��Cu-Mg-Al��ˮ��ʯΪǰ�徭���ա���ԭ�Ʊ���ͭ���߻���,����XRD��H2-TPR��N2������H2-TPD��NH3-TPD��CO2-TPD���������۵ȷ���,�о���M2+����(M2+=Zn2+��Mg2+)��n(M2+)/n(Al3+)�ȶԴ߻����ṹ�͸�����ⷴӦ���ܵ�Ӱ�졣�������,��450 �決�պ�,��ˮ��ʯת��Ϊ�ɼ⾧ʯ��/����������ɵ�����̬ǰ����,�پ�270 �滹ԭ���Ƶø߷�ɢCu�߻��������������������,�߻����ȱ��漰�������ӡ�Cu-Zn-Al�߻�������������������Cu-Mg-Al��Cu-Mg-Al�߻�������ǿ��Cu-Zn-Al��Cu-Zn-Al[n(Cu):n(Zn):n(Al)=1:1:4]�߻������нϼѸ��������Լ�1,2-������ѡ����,��������н϶����ͭ���ġ��ϴ�������Zn���ֲ����������йء�����,Cu-Mg-Al�߻�������ͭ���ĺͼ����Ŀ��ܴ���Эͬ���ôٽ�������ⷴӦ��
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Abstract�� Cu-Zn-Al and Cu-Mg-Al catalysts were prepared from hydrotalcite-like precursors after calcination and reduction. The effect of M2+ (M=Zn or Mg) and M2+/Al3+ ratio on the catalyst structure and performance were investigated by means of XRD, H2-TPR, N2-sorption, H2-TPD, NH3-TPD, CO2-TPD and activity test. The hydrotalcite-like precursors were transformed to the spinel and/or metal oxides after calcination at 450 ��, from which the highly dispersed Cu-based catalysts were prepared after reduction at 270 ��. Compared with the Cu-Mg-Al catalysts, the Cu-Zn-Al catalysts had more amounts of adsorbed hydrogen due to the role of Zn species. With increasing Al2O3 content, the specific surface area and acid amount increased. The Cu-Mg-Al catalysts had more basic sites than the Cu-Zn-Al catalysts. In the hydrogenolysis of glycerol, Cu-Zn-Al[n(Cu):n(Zn):n(Al)=1:1:4] had the highest activity and selectivity to 1,2-propanediol, which is due to the largest amounts of surface Cu and acid sites. For the Cu-Mg-Al catalysts, there may be a synergism between the Cu and basic sites.
Keywords�� hydrotalcite-like compound��   glycerol hydrogenolysis��   1,2-propanediol��   Cu-Mg-Al catalyst��   Cu-Zn-Al catalyst     
Received 2013-05-02;
Corresponding Authors: �¼���,�绰:(022)27890865,E-mail:jxchen@tju.edu.cn��     Email: jxchen@tju.edu.cn
About author: ��ɳɳ(1988-),Ů,˶ʿ��,���¶���߻������о���
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��ɳɳ, ���, �¼���.����ˮ��ʯΪǰ���ͭ���߻����߻�������ⷴӦ[J].  ��ѧ��ҵ�빤��, 2015,32(2): 25-30
Tian Shasha, Yang Juan, Chen Jixiang.Hydrogenolysis of Glycerol to 1,2-Propanediol on Cu-Based Catalysts Derived from Hydrotalcite-Like Precursors[J].  Chemcial Industry and Engineering, 2015,32(2): 25-30
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