氢氧复合疏水催化剂的制备

PREPARATION OF HYDROPHOBIC CATALYST FOR HYDROGEN-OXYGEN RECOMBINATION

以聚苯乙烯 二乙烯基苯(SDB)为载体,用浸渍法研制出常温下在水或100%潮湿气体中都能保持良好活性的疏水性催化剂Pd NSDB。研究了催化剂制备工艺条件对催化活性的影响。得出制备Pd NSDB氢氧复合疏水催化剂的条件为:钯负载率为1%,还原时间为8～10h,还原温度为160～220℃。混合气体(1.72%H2,1.47%O2,平衡气Ar)的空速为60min-1时,所制备的催化剂催化氢氧复合的氢气转化率大于99.9%。所研制的催化剂可用于复合高浓度氢气甚至纯氢的复合系统中,可以在常温下用冷却水除去反应热,使反应床的温度更易控制,提高了氢气复合反应系统的安全性。

Palladium on styrene-divinylbenzene copolymer(SDB) , one type of hydrophobic catalysts has been obtained by applying an immersion preparation method. Pd-NSDB catalyst can convert the hydrogen into water well in a hydrgen-oxygen trickle-bed recombiner system that uses water as the coolant at the ambient temperature. A recombination efficiency >99.9% at a space velocity of 60 min -1 mixed gases(1.72%H 2, 1.47%O 2, Ar as equilibrium gas) is routinely obtained for periods exceeding three months in laboratory studies. The activity of hydrophobic catalyst is affected by carrier and preparation technology. The results show that NSDB is a better carrier of preparing hydrophobic palladium catalyst. The influence of reduction time, reduction temperature and metal loading of preparing catalysts on activity is studied. The technology parameters of preparing catalysts are as follows: reduction time, 8～10 h; reduction temperature, 160～220 ℃; and metal loading, 1%.