High Performance Thin-Layr Ruthenium Catalyst for Next Generation Coal Liquefaction

为了降低目前正在开发的煤炭液化工艺的成本，对复杂的煤炭液化工艺所涉及的各种基础技术进行了降本改造。我们先前已经提出，钌基分散催化剂表现出的活性是当前方法中使用的那些催化剂的20至50倍。然而，钌是一种贵金属，因此非常昂贵。为了解决这一问题，减少催化剂用量，使其长期使用，并可循环使用是稀土催化剂发展的关键。用该催化剂对印尼褐煤进行了液化反应，考察了钌在氧化铝上的形貌和负载量。最佳催化剂在420 ℃、氢分压5 MPa（冷态）下转化率为82%，轻质油馏分质量分数为50%。由于评价是在间歇式高压釜中进行的，并且催化剂预期用于流动反应器系统中，因此获得的结果不能描述流动反应。研究了氧化铝丝的强度对液化反应的影响，但氧化铝丝的强度不足以满足液化反应的要求，对于大规模的反应，需要进一步提高氧化铝丝的强度。

In order to reduce the cost of coal liquefaction process currently under developing, improvement of cost reduction in variety of fundamental technologies involved in the complex coal liquefaction process. We have previously proposed that ruthenium based dispersed catalyst exhibited 20 to 50 times as active as those catalysts used in the current process. However, ruthenium is a precious metal and consequently very expensive. To overcome this undesirable problem, reduction of the amount of catalyst, long term service, and recycle use are the key requirement of rethenium catalyst development.We have developed ruthenium loaded-thin layred alumina by electrode oxidation of aluminum plate. Liquefaction of Indonesian lignite was carried out with the catalyst, and shape and loading level of ruthenium on thin layred alumina were examined. The best catalyst achieved conversion of 82% at 420 oC,under hydrogen partial pressure of 5 MPa (cold), affording light oil fraction of 50%. Since the evaluation was conducted in a batch autoclave, and the catalyst is expected to use in a flow reactor system, the results obtained could not describe flow reaction. This result exhibits possibility of the usage of such thin layred rethenium catalyst, in flow system.Use of alumina wire was examined but the strength of alumina wire is not sufficient for the liquefaction reaction.For a large scale reactions, further improvement in the strength of alumina thin layr is required.