Effects of support pore size on new Cs2.5H0.5PW12O40/SiO2 catalysts for the ring-opening polymerization of tetrahydrofuran
Effects of support pore size on new Cs2.5H0.5PW12O40/SiO2 catalysts for the ring-opening polymerization of tetrahydrofuran
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载体孔径对新型Cs2.5H0.5PW12O40/SiO2催化剂四氢呋喃开环聚合的影响
DOI：
10.1016/j.cclet.2008.11.032
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发表时间：
2009-03
影响因子：
9.1
通讯作者：
Li, Yang
中科院分区：
文献类型：
--
作者：
Zhou, Fu Dong;Luo, Shi Zhong;Chu, Wei;Liao, Xue Mei;Li, Yang
采用浸渍法制备了介孔SiO2负载的Cs2. 5 H 0. 5 PW 12 O 40催化剂，并选用了几种不同孔径的SiO2载体。利用N2吸附、XRD和ICP-AES等技术对载体和催化剂进行了表征。XRD结果表明，孔径越大，Cs2. 5 H 0. 5 PW 12的分散性越好。催化活性结果表明，孔径大小对催化剂活性和PTHF分子量有重要影响。当Cs2.5H0.5PW12O40分散在较大孔径的SiO2载体上时，催化剂表现出较好的合成PTHF的性能。结果表明，在大孔载体上分散的Cs2.5H0.5PW12O40催化剂上PTHF产物的分子量高于在小孔载体上分散的催化剂。负载型Cs2.5H0.5PW12O40催化剂活性组分的浸出量较低。在5次反应循环后，大孔SiO2载体的负载型Cs2.5H0.5PW12O40催化剂仍具有良好的活性和稳定性。这些结果比负载型杂多酸H_3PW_1_2O_40催化剂的结果好得多。
Mesoporous silica supported Cs2.5H0.5PW12O40catalysts were prepared by impregnation method, and several silica supports with different pore size were utilized. N2adsorption, XRD and ICP-AES techniques were utilized to characterize the silica supports and catalysts. XRD results showed that the dispersion of Cs2.5H0.5PW12was better for the silica support with larger pore size. The catalytic activity results showed that the pore size played important role on the catalyst activity and the molecular weight of PTHF. When Cs2.5H0.5PW12O40was dispersed on larger pore size silica support, the catalysts showed good performances for the synthesis of PTHF. The molecular weight of PTHF product on the sample in which Cs2.5H0.5PW12O40was dispersed on larger pore support was higher than that on the catalyst with smaller pore support. The leaching amounts of the active components for the supported Cs2.5H0.5PW12O40catalysts were much lower. After five reaction cycles, there were still good activities and stabilities for the supported Cs2.5H0.5PW12O40catalysts with larger pore silica supports. These results were much better than those of the supported heteropolyacid H3PW12O40catalyst.
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超声等离子体处理制备负载型杂多酸催化剂
DOI：
10.1007/s11595-006-2234-z
发表时间：
2008-06
期刊：
武汉理工大学学报-材料科学版(英文版)
影响因子：
--
作者：
Chen, Muhua;Chu, Wei;Hu, Jinyan;Li, Yang
通讯作者：
Li, Yang
影响因子：
5.5
作者：
K. Nowiǹska;W. Kaleta
通讯作者：
K. Nowiǹska;W. Kaleta
影响因子：
5.3
作者：
S. Soled;S. Miseo;G. Mcvicker;W. Gates;Antonio Gutierrez;J. Paes
通讯作者：
S. Soled;S. Miseo;G. Mcvicker;W. Gates;Antonio Gutierrez;J. Paes
影响因子：
5.5
作者：
Kimura, M;Nakato, T;Okuhara, T
通讯作者：
Okuhara, T
影响因子：
5.3
作者：
Setoyama, T;Kobayashi, M;Nakanishi, A
通讯作者：
Nakanishi, A