新型固体超强酸Ni^(2-)+SO_4^(2-)/ZrO_2-Nb_2O_5的制备和表征

在SO42-/ZrO2固体超强酸的基础上添加Ni元素和Nb2O5,制成新型固体超强酸Ni2-+SO42-/ZrO2-Nb2O5。通过FT IR、XRD、TG-DTA、BET等技术对其结构进行了表征。结果显示:Ni元素和Nb元素的加入均起到了促进和稳定作用。并且运用Hammett指示剂法测得其酸强度可以达到-14.52,在催化乙酸丁酯的反应中可使乙酸的转化率达到98.86%。

Rare earth metals modified Ni-S2O8^2-/ZrO2-Al2O3 catalysts for n-pentane isomerization

The effects of adding rare earth(RE) metals,such as Ce,Yb and Pr to Ni-S_2O_8^(2-)/ZrO_2-Al_2O_3(Ni-SZA) on the structure of catalysts as well as their isomerization performance were studied.The prepared catalysts were characterized by XRD,BET,FT-IR,Py-IR,and H_2-TPR,The results showed that the addition of RE metals can increase the strength and amounts of the acid sites,improve the redox properties of catalysts.The Yb-Ni-SZA catalyst showed the best redox properties,which could provide enough metallic sites.In addition,it provided the largest amounts of weak and moderately strong acid sites.Among RE metals modified Ni-SZA catalyst,Yb-Ni-SZA exhibited the highest isopentane yield of 61.7%at 160 °C.The optimum isomerization catalytic performance of the catalysts decreased in the order of Yb-Ni-SZA > Pr-Ni-SZA > Ni-SZA > Ce-Ni-SZA.

固体超强酸SO_4^(2-)/TiO_2/Nd^(3+)催化合成肉桂酸异戊酯

采用稀土元素Nd3+对固体超强酸SO42-/TiO2进行改性,以肉桂酸和异戊醇为原料合成肉桂酸异戊酯。考察了各种因素对酯化率的影响。实验结果表明:最佳反应条件为催化剂焙烧温度450℃,催化剂用量1.0 g,醇酸摩尔比1∶4,反应时间2 h。该催化剂可再生重复多次使用,产品的酯化率达93.8%。