Preparation of the supported heteropolyacids catalyst by ultrasound-plasma treatment

Preparation of the supported heteropolyacids catalyst by ultrasound-plasma treatment
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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
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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:
--
通讯作者:
Li, Yang
Li, Yang
中科院分区:
其他
文献类型:
--
作者:
Chen, Muhua;Chu, Wei;Hu, Jinyan;Li, Yang

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采用超声和等离子体相结合的方法制备了中性氧化铝负载磷钨杂多酸(PW12)催化剂。用红外光谱(Py-IR)、程序升温脱附(Py-TPD)、比表面积(BET)和X-射线衍射仪(XRD)对催化剂进行了表征,并用四氢呋喃的阳离子聚合反应评价了催化剂的催化性能。结果表明,等离子体处理显著提高了催化剂的表面酸性,而超声处理使PW12均匀分散在载体表面,暴露出更多的酸催化活性中心。新型催化剂的催化活性(69.7%)明显高于传统催化剂的活性(57.5%)。
Novel catalysts of phosphotungstic heteropolyacids (PW12) supported on neutral alumina were prepared by assistance of ultrasound and plasma treatment. The prepared catalysts were characterized by FT-IR pyridine adsorption (Py-IR), temperature programmed desorption of Pyridine (Py-TPD), BET and X-ray diffraction (XRD), and their catalytic performances were evaluated by the cationic polymerization of tetrahydrofuran. The results indicate that plasma treatment remarkably increases the surface acidity of the prepared catalyst while ultrasonic treatment induces PW12to uniformly disperse on the support surface and expose more active sites for the acid catalytic reaction. A higher catalytic activity (69.7%) is obtained on the novel catalyst, which significantly outstripped that on the conventional sample (57.5%).
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